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0
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1 /* vi:set ts=8 sts=4 sw=4:
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2 *
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3 * VIM - Vi IMproved by Bram Moolenaar
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4 *
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5 * Do ":help uganda" in Vim to read copying and usage conditions.
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6 * Do ":help credits" in Vim to see a list of people who contributed.
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7 * See README.txt for an overview of the Vim source code.
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8 */
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9
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10 /*
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11 * undo.c: multi level undo facility
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12 *
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13 * The saved lines are stored in a list of lists (one for each buffer):
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14 *
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15 * b_u_oldhead------------------------------------------------+
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16 * |
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17 * V
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18 * +--------------+ +--------------+ +--------------+
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19 * b_u_newhead--->| u_header | | u_header | | u_header |
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20 * | uh_next------>| uh_next------>| uh_next---->NULL
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21 * NULL<--------uh_prev |<---------uh_prev |<---------uh_prev |
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22 * | uh_entry | | uh_entry | | uh_entry |
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23 * +--------|-----+ +--------|-----+ +--------|-----+
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24 * | | |
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25 * V V V
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26 * +--------------+ +--------------+ +--------------+
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27 * | u_entry | | u_entry | | u_entry |
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28 * | ue_next | | ue_next | | ue_next |
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29 * +--------|-----+ +--------|-----+ +--------|-----+
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30 * | | |
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31 * V V V
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32 * +--------------+ NULL NULL
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33 * | u_entry |
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34 * | ue_next |
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35 * +--------|-----+
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36 * |
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37 * V
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38 * etc.
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39 *
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40 * Each u_entry list contains the information for one undo or redo.
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41 * curbuf->b_u_curhead points to the header of the last undo (the next redo),
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42 * or is NULL if nothing has been undone (end of the branch).
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43 *
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44 * For keeping alternate undo/redo branches the uh_alt field is used. Thus at
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45 * each point in the list a branch may appear for an alternate to redo. The
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46 * uh_seq field is numbered sequentially to be able to find a newer or older
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47 * branch.
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48 *
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49 * +---------------+ +---------------+
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50 * b_u_oldhead --->| u_header | | u_header |
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51 * | uh_alt_next ---->| uh_alt_next ----> NULL
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52 * NULL <----- uh_alt_prev |<------ uh_alt_prev |
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53 * | uh_prev | | uh_prev |
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54 * +-----|---------+ +-----|---------+
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55 * | |
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56 * V V
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57 * +---------------+ +---------------+
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58 * | u_header | | u_header |
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59 * | uh_alt_next | | uh_alt_next |
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60 * b_u_newhead --->| uh_alt_prev | | uh_alt_prev |
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61 * | uh_prev | | uh_prev |
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62 * +-----|---------+ +-----|---------+
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63 * | |
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64 * V V
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65 * NULL +---------------+ +---------------+
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66 * | u_header | | u_header |
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67 * | uh_alt_next ---->| uh_alt_next |
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68 * | uh_alt_prev |<------ uh_alt_prev |
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69 * | uh_prev | | uh_prev |
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70 * +-----|---------+ +-----|---------+
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71 * | |
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72 * etc. etc.
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73 *
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74 *
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75 * All data is allocated with U_ALLOC_LINE(), it will be freed as soon as the
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76 * buffer is unloaded.
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77 */
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78
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79 /* Uncomment the next line for including the u_check() function. This warns
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80 * for errors in the debug information. */
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81 /* #define U_DEBUG 1 */
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82 #define UH_MAGIC 0x18dade /* value for uh_magic when in use */
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83 #define UE_MAGIC 0xabc123 /* value for ue_magic when in use */
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84
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85 #include "vim.h"
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86
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87 /* See below: use malloc()/free() for memory management. */
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88 #define U_USE_MALLOC 1
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89
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90 static void u_unch_branch __ARGS((u_header_T *uhp));
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91 static u_entry_T *u_get_headentry __ARGS((void));
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92 static void u_getbot __ARGS((void));
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93 static int u_savecommon __ARGS((linenr_T, linenr_T, linenr_T));
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94 static void u_doit __ARGS((int count));
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95 static void u_undoredo __ARGS((int undo));
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96 static void u_undo_end __ARGS((int did_undo, int absolute));
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97 static void u_add_time __ARGS((char_u *buf, size_t buflen, time_t tt));
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98 static void u_freeheader __ARGS((buf_T *buf, u_header_T *uhp, u_header_T **uhpp));
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99 static void u_freebranch __ARGS((buf_T *buf, u_header_T *uhp, u_header_T **uhpp));
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100 static void u_freeentries __ARGS((buf_T *buf, u_header_T *uhp, u_header_T **uhpp));
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101 static void u_freeentry __ARGS((u_entry_T *, long));
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102
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103 #ifdef U_USE_MALLOC
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104 # define U_FREE_LINE(ptr) vim_free(ptr)
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105 # define U_ALLOC_LINE(size) lalloc((long_u)((size) + 1), FALSE)
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106 #else
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107 static void u_free_line __ARGS((char_u *ptr, int keep));
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108 static char_u *u_alloc_line __ARGS((unsigned size));
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109 # define U_FREE_LINE(ptr) u_free_line((ptr), FALSE)
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110 # define U_ALLOC_LINE(size) u_alloc_line(size)
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111 #endif
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112 static char_u *u_save_line __ARGS((linenr_T));
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113
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114 static long u_newcount, u_oldcount;
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115
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116 /*
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117 * When 'u' flag included in 'cpoptions', we behave like vi. Need to remember
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118 * the action that "u" should do.
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119 */
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120 static int undo_undoes = FALSE;
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121
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122 #ifdef U_DEBUG
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123 /*
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124 * Check the undo structures for being valid. Print a warning when something
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125 * looks wrong.
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126 */
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127 static int seen_b_u_curhead;
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128 static int seen_b_u_newhead;
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129 static int header_count;
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130
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131 static void
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132 u_check_tree(u_header_T *uhp,
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133 u_header_T *exp_uh_next,
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134 u_header_T *exp_uh_alt_prev)
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135 {
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136 u_entry_T *uep;
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137
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138 if (uhp == NULL)
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139 return;
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140 ++header_count;
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141 if (uhp == curbuf->b_u_curhead && ++seen_b_u_curhead > 1)
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142 {
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143 EMSG("b_u_curhead found twice (looping?)");
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144 return;
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145 }
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146 if (uhp == curbuf->b_u_newhead && ++seen_b_u_newhead > 1)
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147 {
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148 EMSG("b_u_newhead found twice (looping?)");
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149 return;
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150 }
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151
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152 if (uhp->uh_magic != UH_MAGIC)
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153 EMSG("uh_magic wrong (may be using freed memory)");
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154 else
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155 {
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156 /* Check pointers back are correct. */
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157 if (uhp->uh_next != exp_uh_next)
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158 {
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159 EMSG("uh_next wrong");
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160 smsg((char_u *)"expected: 0x%x, actual: 0x%x",
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161 exp_uh_next, uhp->uh_next);
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162 }
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163 if (uhp->uh_alt_prev != exp_uh_alt_prev)
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164 {
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165 EMSG("uh_alt_prev wrong");
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166 smsg((char_u *)"expected: 0x%x, actual: 0x%x",
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167 exp_uh_alt_prev, uhp->uh_alt_prev);
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168 }
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169
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170 /* Check the undo tree at this header. */
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171 for (uep = uhp->uh_entry; uep != NULL; uep = uep->ue_next)
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172 {
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173 if (uep->ue_magic != UE_MAGIC)
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174 {
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175 EMSG("ue_magic wrong (may be using freed memory)");
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176 break;
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177 }
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178 }
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179
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180 /* Check the next alt tree. */
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181 u_check_tree(uhp->uh_alt_next, uhp->uh_next, uhp);
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182
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183 /* Check the next header in this branch. */
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184 u_check_tree(uhp->uh_prev, uhp, NULL);
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185 }
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186 }
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187
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188 void
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189 u_check(int newhead_may_be_NULL)
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190 {
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191 seen_b_u_newhead = 0;
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192 seen_b_u_curhead = 0;
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193 header_count = 0;
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194
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195 u_check_tree(curbuf->b_u_oldhead, NULL, NULL);
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196
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197 if (seen_b_u_newhead == 0 && curbuf->b_u_oldhead != NULL
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198 && !(newhead_may_be_NULL && curbuf->b_u_newhead == NULL))
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199 EMSGN("b_u_newhead invalid: 0x%x", curbuf->b_u_newhead);
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200 if (curbuf->b_u_curhead != NULL && seen_b_u_curhead == 0)
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201 EMSGN("b_u_curhead invalid: 0x%x", curbuf->b_u_curhead);
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202 if (header_count != curbuf->b_u_numhead)
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203 {
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204 EMSG("b_u_numhead invalid");
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205 smsg((char_u *)"expected: %ld, actual: %ld",
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206 (long)header_count, (long)curbuf->b_u_numhead);
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207 }
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208 }
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209 #endif
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210
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211 /*
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212 * Save the current line for both the "u" and "U" command.
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213 * Returns OK or FAIL.
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214 */
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215 int
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216 u_save_cursor()
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217 {
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218 return (u_save((linenr_T)(curwin->w_cursor.lnum - 1),
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219 (linenr_T)(curwin->w_cursor.lnum + 1)));
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220 }
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221
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222 /*
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223 * Save the lines between "top" and "bot" for both the "u" and "U" command.
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224 * "top" may be 0 and bot may be curbuf->b_ml.ml_line_count + 1.
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225 * Returns FAIL when lines could not be saved, OK otherwise.
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226 */
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227 int
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228 u_save(top, bot)
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229 linenr_T top, bot;
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230 {
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231 if (undo_off)
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232 return OK;
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233
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234 if (top > curbuf->b_ml.ml_line_count ||
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235 top >= bot || bot > curbuf->b_ml.ml_line_count + 1)
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236 return FALSE; /* rely on caller to do error messages */
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237
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238 if (top + 2 == bot)
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239 u_saveline((linenr_T)(top + 1));
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240
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241 return (u_savecommon(top, bot, (linenr_T)0));
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242 }
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243
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244 /*
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245 * save the line "lnum" (used by ":s" and "~" command)
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246 * The line is replaced, so the new bottom line is lnum + 1.
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247 */
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248 int
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249 u_savesub(lnum)
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250 linenr_T lnum;
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251 {
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252 if (undo_off)
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253 return OK;
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254
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255 return (u_savecommon(lnum - 1, lnum + 1, lnum + 1));
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256 }
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257
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258 /*
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259 * a new line is inserted before line "lnum" (used by :s command)
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260 * The line is inserted, so the new bottom line is lnum + 1.
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261 */
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262 int
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263 u_inssub(lnum)
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264 linenr_T lnum;
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265 {
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266 if (undo_off)
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267 return OK;
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268
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269 return (u_savecommon(lnum - 1, lnum, lnum + 1));
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270 }
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271
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272 /*
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273 * save the lines "lnum" - "lnum" + nlines (used by delete command)
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274 * The lines are deleted, so the new bottom line is lnum, unless the buffer
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275 * becomes empty.
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276 */
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277 int
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278 u_savedel(lnum, nlines)
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279 linenr_T lnum;
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280 long nlines;
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281 {
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282 if (undo_off)
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283 return OK;
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284
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285 return (u_savecommon(lnum - 1, lnum + nlines,
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286 nlines == curbuf->b_ml.ml_line_count ? 2 : lnum));
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287 }
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288
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289 /*
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290 * Return TRUE when undo is allowed. Otherwise give an error message and
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291 * return FALSE.
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292 */
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293 int
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294 undo_allowed()
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295 {
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296 /* Don't allow changes when 'modifiable' is off. */
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297 if (!curbuf->b_p_ma)
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298 {
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299 EMSG(_(e_modifiable));
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300 return FALSE;
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301 }
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302
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303 #ifdef HAVE_SANDBOX
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304 /* In the sandbox it's not allowed to change the text. */
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305 if (sandbox != 0)
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306 {
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307 EMSG(_(e_sandbox));
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308 return FALSE;
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309 }
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310 #endif
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311
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312 /* Don't allow changes in the buffer while editing the cmdline. The
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313 * caller of getcmdline() may get confused. */
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314 if (textlock != 0)
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315 {
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316 EMSG(_(e_secure));
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317 return FALSE;
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318 }
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319
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320 return TRUE;
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321 }
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322
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323 static int
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324 u_savecommon(top, bot, newbot)
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325 linenr_T top, bot;
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326 linenr_T newbot;
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327 {
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328 linenr_T lnum;
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329 long i;
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330 u_header_T *uhp;
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331 u_header_T *old_curhead;
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332 u_entry_T *uep;
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333 u_entry_T *prev_uep;
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334 long size;
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335
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336 /* When making changes is not allowed return FAIL. It's a crude way to
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337 * make all change commands fail. */
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338 if (!undo_allowed())
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339 return FAIL;
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340
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341 #ifdef U_DEBUG
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342 u_check(FALSE);
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343 #endif
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344 #ifdef FEAT_NETBEANS_INTG
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345 /*
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346 * Netbeans defines areas that cannot be modified. Bail out here when
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347 * trying to change text in a guarded area.
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348 */
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349 if (usingNetbeans)
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350 {
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351 if (netbeans_is_guarded(top, bot))
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352 {
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353 EMSG(_(e_guarded));
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354 return FAIL;
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355 }
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356 if (curbuf->b_p_ro)
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357 {
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358 EMSG(_(e_nbreadonly));
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359 return FAIL;
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360 }
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361 }
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362 #endif
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363
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364 #ifdef FEAT_AUTOCMD
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365 /*
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366 * Saving text for undo means we are going to make a change. Give a
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367 * warning for a read-only file before making the change, so that the
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368 * FileChangedRO event can replace the buffer with a read-write version
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369 * (e.g., obtained from a source control system).
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370 */
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371 change_warning(0);
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372 #endif
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373
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374 size = bot - top - 1;
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375
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376 /*
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377 * if curbuf->b_u_synced == TRUE make a new header
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378 */
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379 if (curbuf->b_u_synced)
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380 {
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381 #ifdef FEAT_JUMPLIST
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382 /* Need to create new entry in b_changelist. */
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383 curbuf->b_new_change = TRUE;
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384 #endif
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385
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386 if (p_ul >= 0)
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387 {
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388 /*
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389 * Make a new header entry. Do this first so that we don't mess
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390 * up the undo info when out of memory.
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391 */
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392 uhp = (u_header_T *)U_ALLOC_LINE((unsigned)sizeof(u_header_T));
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393 if (uhp == NULL)
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394 goto nomem;
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395 #ifdef U_DEBUG
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396 uhp->uh_magic = UH_MAGIC;
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397 #endif
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398 }
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399 else
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400 uhp = NULL;
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401
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402 /*
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403 * If we undid more than we redid, move the entry lists before and
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404 * including curbuf->b_u_curhead to an alternate branch.
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|
405 */
|
|
|
406 old_curhead = curbuf->b_u_curhead;
|
|
|
407 if (old_curhead != NULL)
|
|
|
408 {
|
|
|
409 curbuf->b_u_newhead = old_curhead->uh_next;
|
|
|
410 curbuf->b_u_curhead = NULL;
|
|
|
411 }
|
|
|
412
|
|
|
413 /*
|
|
|
414 * free headers to keep the size right
|
|
|
415 */
|
|
|
416 while (curbuf->b_u_numhead > p_ul && curbuf->b_u_oldhead != NULL)
|
|
|
417 {
|
|
|
418 u_header_T *uhfree = curbuf->b_u_oldhead;
|
|
|
419
|
|
|
420 if (uhfree == old_curhead)
|
|
|
421 /* Can't reconnect the branch, delete all of it. */
|
|
|
422 u_freebranch(curbuf, uhfree, &old_curhead);
|
|
|
423 else if (uhfree->uh_alt_next == NULL)
|
|
|
424 /* There is no branch, only free one header. */
|
|
|
425 u_freeheader(curbuf, uhfree, &old_curhead);
|
|
|
426 else
|
|
|
427 {
|
|
|
428 /* Free the oldest alternate branch as a whole. */
|
|
|
429 while (uhfree->uh_alt_next != NULL)
|
|
|
430 uhfree = uhfree->uh_alt_next;
|
|
|
431 u_freebranch(curbuf, uhfree, &old_curhead);
|
|
|
432 }
|
|
|
433 #ifdef U_DEBUG
|
|
|
434 u_check(TRUE);
|
|
|
435 #endif
|
|
|
436 }
|
|
|
437
|
|
|
438 if (uhp == NULL) /* no undo at all */
|
|
|
439 {
|
|
|
440 if (old_curhead != NULL)
|
|
|
441 u_freebranch(curbuf, old_curhead, NULL);
|
|
|
442 curbuf->b_u_synced = FALSE;
|
|
|
443 return OK;
|
|
|
444 }
|
|
|
445
|
|
|
446 uhp->uh_prev = NULL;
|
|
|
447 uhp->uh_next = curbuf->b_u_newhead;
|
|
|
448 uhp->uh_alt_next = old_curhead;
|
|
|
449 if (old_curhead != NULL)
|
|
|
450 {
|
|
|
451 uhp->uh_alt_prev = old_curhead->uh_alt_prev;
|
|
|
452 if (uhp->uh_alt_prev != NULL)
|
|
|
453 uhp->uh_alt_prev->uh_alt_next = uhp;
|
|
|
454 old_curhead->uh_alt_prev = uhp;
|
|
|
455 if (curbuf->b_u_oldhead == old_curhead)
|
|
|
456 curbuf->b_u_oldhead = uhp;
|
|
|
457 }
|
|
|
458 else
|
|
|
459 uhp->uh_alt_prev = NULL;
|
|
|
460 if (curbuf->b_u_newhead != NULL)
|
|
|
461 curbuf->b_u_newhead->uh_prev = uhp;
|
|
|
462
|
|
|
463 uhp->uh_seq = ++curbuf->b_u_seq_last;
|
|
|
464 curbuf->b_u_seq_cur = uhp->uh_seq;
|
|
|
465 uhp->uh_time = time(NULL);
|
|
|
466 curbuf->b_u_seq_time = uhp->uh_time + 1;
|
|
|
467
|
|
|
468 uhp->uh_walk = 0;
|
|
|
469 uhp->uh_entry = NULL;
|
|
|
470 uhp->uh_getbot_entry = NULL;
|
|
|
471 uhp->uh_cursor = curwin->w_cursor; /* save cursor pos. for undo */
|
|
|
472 #ifdef FEAT_VIRTUALEDIT
|
|
|
473 if (virtual_active() && curwin->w_cursor.coladd > 0)
|
|
|
474 uhp->uh_cursor_vcol = getviscol();
|
|
|
475 else
|
|
|
476 uhp->uh_cursor_vcol = -1;
|
|
|
477 #endif
|
|
|
478
|
|
|
479 /* save changed and buffer empty flag for undo */
|
|
|
480 uhp->uh_flags = (curbuf->b_changed ? UH_CHANGED : 0) +
|
|
|
481 ((curbuf->b_ml.ml_flags & ML_EMPTY) ? UH_EMPTYBUF : 0);
|
|
|
482
|
|
|
483 /* save named marks and Visual marks for undo */
|
|
|
484 mch_memmove(uhp->uh_namedm, curbuf->b_namedm, sizeof(pos_T) * NMARKS);
|
|
|
485 #ifdef FEAT_VISUAL
|
|
|
486 uhp->uh_visual = curbuf->b_visual;
|
|
|
487 #endif
|
|
|
488
|
|
|
489 curbuf->b_u_newhead = uhp;
|
|
|
490 if (curbuf->b_u_oldhead == NULL)
|
|
|
491 curbuf->b_u_oldhead = uhp;
|
|
|
492 ++curbuf->b_u_numhead;
|
|
|
493 }
|
|
|
494 else
|
|
|
495 {
|
|
|
496 if (p_ul < 0) /* no undo at all */
|
|
|
497 return OK;
|
|
|
498
|
|
|
499 /*
|
|
|
500 * When saving a single line, and it has been saved just before, it
|
|
|
501 * doesn't make sense saving it again. Saves a lot of memory when
|
|
|
502 * making lots of changes inside the same line.
|
|
|
503 * This is only possible if the previous change didn't increase or
|
|
|
504 * decrease the number of lines.
|
|
|
505 * Check the ten last changes. More doesn't make sense and takes too
|
|
|
506 * long.
|
|
|
507 */
|
|
|
508 if (size == 1)
|
|
|
509 {
|
|
|
510 uep = u_get_headentry();
|
|
|
511 prev_uep = NULL;
|
|
|
512 for (i = 0; i < 10; ++i)
|
|
|
513 {
|
|
|
514 if (uep == NULL)
|
|
|
515 break;
|
|
|
516
|
|
|
517 /* If lines have been inserted/deleted we give up.
|
|
|
518 * Also when the line was included in a multi-line save. */
|
|
|
519 if ((curbuf->b_u_newhead->uh_getbot_entry != uep
|
|
|
520 ? (uep->ue_top + uep->ue_size + 1
|
|
|
521 != (uep->ue_bot == 0
|
|
|
522 ? curbuf->b_ml.ml_line_count + 1
|
|
|
523 : uep->ue_bot))
|
|
|
524 : uep->ue_lcount != curbuf->b_ml.ml_line_count)
|
|
|
525 || (uep->ue_size > 1
|
|
|
526 && top >= uep->ue_top
|
|
|
527 && top + 2 <= uep->ue_top + uep->ue_size + 1))
|
|
|
528 break;
|
|
|
529
|
|
|
530 /* If it's the same line we can skip saving it again. */
|
|
|
531 if (uep->ue_size == 1 && uep->ue_top == top)
|
|
|
532 {
|
|
|
533 if (i > 0)
|
|
|
534 {
|
|
|
535 /* It's not the last entry: get ue_bot for the last
|
|
|
536 * entry now. Following deleted/inserted lines go to
|
|
|
537 * the re-used entry. */
|
|
|
538 u_getbot();
|
|
|
539 curbuf->b_u_synced = FALSE;
|
|
|
540
|
|
|
541 /* Move the found entry to become the last entry. The
|
|
|
542 * order of undo/redo doesn't matter for the entries
|
|
|
543 * we move it over, since they don't change the line
|
|
|
544 * count and don't include this line. It does matter
|
|
|
545 * for the found entry if the line count is changed by
|
|
|
546 * the executed command. */
|
|
|
547 prev_uep->ue_next = uep->ue_next;
|
|
|
548 uep->ue_next = curbuf->b_u_newhead->uh_entry;
|
|
|
549 curbuf->b_u_newhead->uh_entry = uep;
|
|
|
550 }
|
|
|
551
|
|
|
552 /* The executed command may change the line count. */
|
|
|
553 if (newbot != 0)
|
|
|
554 uep->ue_bot = newbot;
|
|
|
555 else if (bot > curbuf->b_ml.ml_line_count)
|
|
|
556 uep->ue_bot = 0;
|
|
|
557 else
|
|
|
558 {
|
|
|
559 uep->ue_lcount = curbuf->b_ml.ml_line_count;
|
|
|
560 curbuf->b_u_newhead->uh_getbot_entry = uep;
|
|
|
561 }
|
|
|
562 return OK;
|
|
|
563 }
|
|
|
564 prev_uep = uep;
|
|
|
565 uep = uep->ue_next;
|
|
|
566 }
|
|
|
567 }
|
|
|
568
|
|
|
569 /* find line number for ue_bot for previous u_save() */
|
|
|
570 u_getbot();
|
|
|
571 }
|
|
|
572
|
|
|
573 #if !defined(UNIX) && !defined(DJGPP) && !defined(WIN32) && !defined(__EMX__)
|
|
|
574 /*
|
|
|
575 * With Amiga and MSDOS 16 bit we can't handle big undo's, because
|
|
|
576 * then u_alloc_line would have to allocate a block larger than 32K
|
|
|
577 */
|
|
|
578 if (size >= 8000)
|
|
|
579 goto nomem;
|
|
|
580 #endif
|
|
|
581
|
|
|
582 /*
|
|
|
583 * add lines in front of entry list
|
|
|
584 */
|
|
|
585 uep = (u_entry_T *)U_ALLOC_LINE((unsigned)sizeof(u_entry_T));
|
|
|
586 if (uep == NULL)
|
|
|
587 goto nomem;
|
|
|
588 #ifdef U_DEBUG
|
|
|
589 uep->ue_magic = UE_MAGIC;
|
|
|
590 #endif
|
|
|
591
|
|
|
592 uep->ue_size = size;
|
|
|
593 uep->ue_top = top;
|
|
|
594 if (newbot != 0)
|
|
|
595 uep->ue_bot = newbot;
|
|
|
596 /*
|
|
|
597 * Use 0 for ue_bot if bot is below last line.
|
|
|
598 * Otherwise we have to compute ue_bot later.
|
|
|
599 */
|
|
|
600 else if (bot > curbuf->b_ml.ml_line_count)
|
|
|
601 uep->ue_bot = 0;
|
|
|
602 else
|
|
|
603 {
|
|
|
604 uep->ue_lcount = curbuf->b_ml.ml_line_count;
|
|
|
605 curbuf->b_u_newhead->uh_getbot_entry = uep;
|
|
|
606 }
|
|
|
607
|
|
|
608 if (size > 0)
|
|
|
609 {
|
|
|
610 if ((uep->ue_array = (char_u **)U_ALLOC_LINE(
|
|
|
611 (unsigned)(sizeof(char_u *) * size))) == NULL)
|
|
|
612 {
|
|
|
613 u_freeentry(uep, 0L);
|
|
|
614 goto nomem;
|
|
|
615 }
|
|
|
616 for (i = 0, lnum = top + 1; i < size; ++i)
|
|
|
617 {
|
|
|
618 fast_breakcheck();
|
|
|
619 if (got_int)
|
|
|
620 {
|
|
|
621 u_freeentry(uep, i);
|
|
|
622 return FAIL;
|
|
|
623 }
|
|
|
624 if ((uep->ue_array[i] = u_save_line(lnum++)) == NULL)
|
|
|
625 {
|
|
|
626 u_freeentry(uep, i);
|
|
|
627 goto nomem;
|
|
|
628 }
|
|
|
629 }
|
|
|
630 }
|
|
|
631 else
|
|
|
632 uep->ue_array = NULL;
|
|
|
633 uep->ue_next = curbuf->b_u_newhead->uh_entry;
|
|
|
634 curbuf->b_u_newhead->uh_entry = uep;
|
|
|
635 curbuf->b_u_synced = FALSE;
|
|
|
636 undo_undoes = FALSE;
|
|
|
637
|
|
|
638 #ifdef U_DEBUG
|
|
|
639 u_check(FALSE);
|
|
|
640 #endif
|
|
|
641 return OK;
|
|
|
642
|
|
|
643 nomem:
|
|
|
644 msg_silent = 0; /* must display the prompt */
|
|
|
645 if (ask_yesno((char_u *)_("No undo possible; continue anyway"), TRUE)
|
|
|
646 == 'y')
|
|
|
647 {
|
|
|
648 undo_off = TRUE; /* will be reset when character typed */
|
|
|
649 return OK;
|
|
|
650 }
|
|
|
651 do_outofmem_msg((long_u)0);
|
|
|
652 return FAIL;
|
|
|
653 }
|
|
|
654
|
|
|
655 /*
|
|
|
656 * If 'cpoptions' contains 'u': Undo the previous undo or redo (vi compatible).
|
|
|
657 * If 'cpoptions' does not contain 'u': Always undo.
|
|
|
658 */
|
|
|
659 void
|
|
|
660 u_undo(count)
|
|
|
661 int count;
|
|
|
662 {
|
|
|
663 /*
|
|
|
664 * If we get an undo command while executing a macro, we behave like the
|
|
|
665 * original vi. If this happens twice in one macro the result will not
|
|
|
666 * be compatible.
|
|
|
667 */
|
|
|
668 if (curbuf->b_u_synced == FALSE)
|
|
|
669 {
|
|
|
670 u_sync(TRUE);
|
|
|
671 count = 1;
|
|
|
672 }
|
|
|
673
|
|
|
674 if (vim_strchr(p_cpo, CPO_UNDO) == NULL)
|
|
|
675 undo_undoes = TRUE;
|
|
|
676 else
|
|
|
677 undo_undoes = !undo_undoes;
|
|
|
678 u_doit(count);
|
|
|
679 }
|
|
|
680
|
|
|
681 /*
|
|
|
682 * If 'cpoptions' contains 'u': Repeat the previous undo or redo.
|
|
|
683 * If 'cpoptions' does not contain 'u': Always redo.
|
|
|
684 */
|
|
|
685 void
|
|
|
686 u_redo(count)
|
|
|
687 int count;
|
|
|
688 {
|
|
|
689 if (vim_strchr(p_cpo, CPO_UNDO) == NULL)
|
|
|
690 undo_undoes = FALSE;
|
|
|
691 u_doit(count);
|
|
|
692 }
|
|
|
693
|
|
|
694 /*
|
|
|
695 * Undo or redo, depending on 'undo_undoes', 'count' times.
|
|
|
696 */
|
|
|
697 static void
|
|
|
698 u_doit(startcount)
|
|
|
699 int startcount;
|
|
|
700 {
|
|
|
701 int count = startcount;
|
|
|
702
|
|
|
703 if (!undo_allowed())
|
|
|
704 return;
|
|
|
705
|
|
|
706 u_newcount = 0;
|
|
|
707 u_oldcount = 0;
|
|
|
708 if (curbuf->b_ml.ml_flags & ML_EMPTY)
|
|
|
709 u_oldcount = -1;
|
|
|
710 while (count--)
|
|
|
711 {
|
|
|
712 if (undo_undoes)
|
|
|
713 {
|
|
|
714 if (curbuf->b_u_curhead == NULL) /* first undo */
|
|
|
715 curbuf->b_u_curhead = curbuf->b_u_newhead;
|
|
|
716 else if (p_ul > 0) /* multi level undo */
|
|
|
717 /* get next undo */
|
|
|
718 curbuf->b_u_curhead = curbuf->b_u_curhead->uh_next;
|
|
|
719 /* nothing to undo */
|
|
|
720 if (curbuf->b_u_numhead == 0 || curbuf->b_u_curhead == NULL)
|
|
|
721 {
|
|
|
722 /* stick curbuf->b_u_curhead at end */
|
|
|
723 curbuf->b_u_curhead = curbuf->b_u_oldhead;
|
|
|
724 beep_flush();
|
|
|
725 if (count == startcount - 1)
|
|
|
726 {
|
|
|
727 MSG(_("Already at oldest change"));
|
|
|
728 return;
|
|
|
729 }
|
|
|
730 break;
|
|
|
731 }
|
|
|
732
|
|
|
733 u_undoredo(TRUE);
|
|
|
734 }
|
|
|
735 else
|
|
|
736 {
|
|
|
737 if (curbuf->b_u_curhead == NULL || p_ul <= 0)
|
|
|
738 {
|
|
|
739 beep_flush(); /* nothing to redo */
|
|
|
740 if (count == startcount - 1)
|
|
|
741 {
|
|
|
742 MSG(_("Already at newest change"));
|
|
|
743 return;
|
|
|
744 }
|
|
|
745 break;
|
|
|
746 }
|
|
|
747
|
|
|
748 u_undoredo(FALSE);
|
|
|
749
|
|
|
750 /* Advance for next redo. Set "newhead" when at the end of the
|
|
|
751 * redoable changes. */
|
|
|
752 if (curbuf->b_u_curhead->uh_prev == NULL)
|
|
|
753 curbuf->b_u_newhead = curbuf->b_u_curhead;
|
|
|
754 curbuf->b_u_curhead = curbuf->b_u_curhead->uh_prev;
|
|
|
755 }
|
|
|
756 }
|
|
|
757 u_undo_end(undo_undoes, FALSE);
|
|
|
758 }
|
|
|
759
|
|
|
760 static int lastmark = 0;
|
|
|
761
|
|
|
762 /*
|
|
|
763 * Undo or redo over the timeline.
|
|
|
764 * When "step" is negative go back in time, otherwise goes forward in time.
|
|
|
765 * When "sec" is FALSE make "step" steps, when "sec" is TRUE use "step" as
|
|
|
766 * seconds.
|
|
|
767 * When "absolute" is TRUE use "step" as the sequence number to jump to.
|
|
|
768 * "sec" must be FALSE then.
|
|
|
769 */
|
|
|
770 void
|
|
|
771 undo_time(step, sec, absolute)
|
|
|
772 long step;
|
|
|
773 int sec;
|
|
|
774 int absolute;
|
|
|
775 {
|
|
|
776 long target;
|
|
|
777 long closest;
|
|
|
778 long closest_start;
|
|
|
779 long closest_seq = 0;
|
|
|
780 long val;
|
|
|
781 u_header_T *uhp;
|
|
|
782 u_header_T *last;
|
|
|
783 int mark;
|
|
|
784 int nomark;
|
|
|
785 int round;
|
|
|
786 int dosec = sec;
|
|
|
787 int above = FALSE;
|
|
|
788 int did_undo = TRUE;
|
|
|
789
|
|
|
790 /* First make sure the current undoable change is synced. */
|
|
|
791 if (curbuf->b_u_synced == FALSE)
|
|
|
792 u_sync(TRUE);
|
|
|
793
|
|
|
794 u_newcount = 0;
|
|
|
795 u_oldcount = 0;
|
|
|
796 if (curbuf->b_ml.ml_flags & ML_EMPTY)
|
|
|
797 u_oldcount = -1;
|
|
|
798
|
|
|
799 /* "target" is the node below which we want to be.
|
|
|
800 * Init "closest" to a value we can't reach. */
|
|
|
801 if (absolute)
|
|
|
802 {
|
|
|
803 target = step;
|
|
|
804 closest = -1;
|
|
|
805 }
|
|
|
806 else
|
|
|
807 {
|
|
|
808 /* When doing computations with time_t subtract starttime, because
|
|
|
809 * time_t converted to a long may result in a wrong number. */
|
|
|
810 if (sec)
|
|
|
811 target = (long)(curbuf->b_u_seq_time - starttime) + step;
|
|
|
812 else
|
|
|
813 target = curbuf->b_u_seq_cur + step;
|
|
|
814 if (step < 0)
|
|
|
815 {
|
|
|
816 if (target < 0)
|
|
|
817 target = 0;
|
|
|
818 closest = -1;
|
|
|
819 }
|
|
|
820 else
|
|
|
821 {
|
|
|
822 if (sec)
|
|
|
823 closest = (long)(time(NULL) - starttime + 1);
|
|
|
824 else
|
|
|
825 closest = curbuf->b_u_seq_last + 2;
|
|
|
826 if (target >= closest)
|
|
|
827 target = closest - 1;
|
|
|
828 }
|
|
|
829 }
|
|
|
830 closest_start = closest;
|
|
|
831 closest_seq = curbuf->b_u_seq_cur;
|
|
|
832
|
|
|
833 /*
|
|
|
834 * May do this twice:
|
|
|
835 * 1. Search for "target", update "closest" to the best match found.
|
|
|
836 * 2. If "target" not found search for "closest".
|
|
|
837 *
|
|
|
838 * When using the closest time we use the sequence number in the second
|
|
|
839 * round, because there may be several entries with the same time.
|
|
|
840 */
|
|
|
841 for (round = 1; round <= 2; ++round)
|
|
|
842 {
|
|
|
843 /* Find the path from the current state to where we want to go. The
|
|
|
844 * desired state can be anywhere in the undo tree, need to go all over
|
|
|
845 * it. We put "nomark" in uh_walk where we have been without success,
|
|
|
846 * "mark" where it could possibly be. */
|
|
|
847 mark = ++lastmark;
|
|
|
848 nomark = ++lastmark;
|
|
|
849
|
|
|
850 if (curbuf->b_u_curhead == NULL) /* at leaf of the tree */
|
|
|
851 uhp = curbuf->b_u_newhead;
|
|
|
852 else
|
|
|
853 uhp = curbuf->b_u_curhead;
|
|
|
854
|
|
|
855 while (uhp != NULL)
|
|
|
856 {
|
|
|
857 uhp->uh_walk = mark;
|
|
|
858 val = (long)(dosec ? (uhp->uh_time - starttime) : uhp->uh_seq);
|
|
|
859
|
|
|
860 if (round == 1)
|
|
|
861 {
|
|
|
862 /* Remember the header that is closest to the target.
|
|
|
863 * It must be at least in the right direction (checked with
|
|
|
864 * "b_u_seq_cur"). When the timestamp is equal find the
|
|
|
865 * highest/lowest sequence number. */
|
|
|
866 if ((step < 0 ? uhp->uh_seq <= curbuf->b_u_seq_cur
|
|
|
867 : uhp->uh_seq > curbuf->b_u_seq_cur)
|
|
|
868 && ((dosec && val == closest)
|
|
|
869 ? (step < 0
|
|
|
870 ? uhp->uh_seq < closest_seq
|
|
|
871 : uhp->uh_seq > closest_seq)
|
|
|
872 : closest == closest_start
|
|
|
873 || (val > target
|
|
|
874 ? (closest > target
|
|
|
875 ? val - target <= closest - target
|
|
|
876 : val - target <= target - closest)
|
|
|
877 : (closest > target
|
|
|
878 ? target - val <= closest - target
|
|
|
879 : target - val <= target - closest))))
|
|
|
880 {
|
|
|
881 closest = val;
|
|
|
882 closest_seq = uhp->uh_seq;
|
|
|
883 }
|
|
|
884 }
|
|
|
885
|
|
|
886 /* Quit searching when we found a match. But when searching for a
|
|
|
887 * time we need to continue looking for the best uh_seq. */
|
|
|
888 if (target == val && !dosec)
|
|
|
889 break;
|
|
|
890
|
|
|
891 /* go down in the tree if we haven't been there */
|
|
|
892 if (uhp->uh_prev != NULL && uhp->uh_prev->uh_walk != nomark
|
|
|
893 && uhp->uh_prev->uh_walk != mark)
|
|
|
894 uhp = uhp->uh_prev;
|
|
|
895
|
|
|
896 /* go to alternate branch if we haven't been there */
|
|
|
897 else if (uhp->uh_alt_next != NULL
|
|
|
898 && uhp->uh_alt_next->uh_walk != nomark
|
|
|
899 && uhp->uh_alt_next->uh_walk != mark)
|
|
|
900 uhp = uhp->uh_alt_next;
|
|
|
901
|
|
|
902 /* go up in the tree if we haven't been there and we are at the
|
|
|
903 * start of alternate branches */
|
|
|
904 else if (uhp->uh_next != NULL && uhp->uh_alt_prev == NULL
|
|
|
905 && uhp->uh_next->uh_walk != nomark
|
|
|
906 && uhp->uh_next->uh_walk != mark)
|
|
|
907 {
|
|
|
908 /* If still at the start we don't go through this change. */
|
|
|
909 if (uhp == curbuf->b_u_curhead)
|
|
|
910 uhp->uh_walk = nomark;
|
|
|
911 uhp = uhp->uh_next;
|
|
|
912 }
|
|
|
913
|
|
|
914 else
|
|
|
915 {
|
|
|
916 /* need to backtrack; mark this node as useless */
|
|
|
917 uhp->uh_walk = nomark;
|
|
|
918 if (uhp->uh_alt_prev != NULL)
|
|
|
919 uhp = uhp->uh_alt_prev;
|
|
|
920 else
|
|
|
921 uhp = uhp->uh_next;
|
|
|
922 }
|
|
|
923 }
|
|
|
924
|
|
|
925 if (uhp != NULL) /* found it */
|
|
|
926 break;
|
|
|
927
|
|
|
928 if (absolute)
|
|
|
929 {
|
|
|
930 EMSGN(_("Undo number %ld not found"), step);
|
|
|
931 return;
|
|
|
932 }
|
|
|
933
|
|
|
934 if (closest == closest_start)
|
|
|
935 {
|
|
|
936 if (step < 0)
|
|
|
937 MSG(_("Already at oldest change"));
|
|
|
938 else
|
|
|
939 MSG(_("Already at newest change"));
|
|
|
940 return;
|
|
|
941 }
|
|
|
942
|
|
|
943 target = closest_seq;
|
|
|
944 dosec = FALSE;
|
|
|
945 if (step < 0)
|
|
|
946 above = TRUE; /* stop above the header */
|
|
|
947 }
|
|
|
948
|
|
|
949 /* If we found it: Follow the path to go to where we want to be. */
|
|
|
950 if (uhp != NULL)
|
|
|
951 {
|
|
|
952 /*
|
|
|
953 * First go up the tree as much as needed.
|
|
|
954 */
|
|
|
955 for (;;)
|
|
|
956 {
|
|
|
957 uhp = curbuf->b_u_curhead;
|
|
|
958 if (uhp == NULL)
|
|
|
959 uhp = curbuf->b_u_newhead;
|
|
|
960 else
|
|
|
961 uhp = uhp->uh_next;
|
|
|
962 if (uhp == NULL || uhp->uh_walk != mark
|
|
|
963 || (uhp->uh_seq == target && !above))
|
|
|
964 break;
|
|
|
965 curbuf->b_u_curhead = uhp;
|
|
|
966 u_undoredo(TRUE);
|
|
|
967 uhp->uh_walk = nomark; /* don't go back down here */
|
|
|
968 }
|
|
|
969
|
|
|
970 /*
|
|
|
971 * And now go down the tree (redo), branching off where needed.
|
|
|
972 */
|
|
|
973 uhp = curbuf->b_u_curhead;
|
|
|
974 while (uhp != NULL)
|
|
|
975 {
|
|
|
976 /* Go back to the first branch with a mark. */
|
|
|
977 while (uhp->uh_alt_prev != NULL
|
|
|
978 && uhp->uh_alt_prev->uh_walk == mark)
|
|
|
979 uhp = uhp->uh_alt_prev;
|
|
|
980
|
|
|
981 /* Find the last branch with a mark, that's the one. */
|
|
|
982 last = uhp;
|
|
|
983 while (last->uh_alt_next != NULL
|
|
|
984 && last->uh_alt_next->uh_walk == mark)
|
|
|
985 last = last->uh_alt_next;
|
|
|
986 if (last != uhp)
|
|
|
987 {
|
|
|
988 /* Make the used branch the first entry in the list of
|
|
|
989 * alternatives to make "u" and CTRL-R take this branch. */
|
|
|
990 while (uhp->uh_alt_prev != NULL)
|
|
|
991 uhp = uhp->uh_alt_prev;
|
|
|
992 if (last->uh_alt_next != NULL)
|
|
|
993 last->uh_alt_next->uh_alt_prev = last->uh_alt_prev;
|
|
|
994 last->uh_alt_prev->uh_alt_next = last->uh_alt_next;
|
|
|
995 last->uh_alt_prev = NULL;
|
|
|
996 last->uh_alt_next = uhp;
|
|
|
997 uhp->uh_alt_prev = last;
|
|
|
998
|
|
|
999 uhp = last;
|
|
|
1000 if (uhp->uh_next != NULL)
|
|
|
1001 uhp->uh_next->uh_prev = uhp;
|
|
|
1002 }
|
|
|
1003 curbuf->b_u_curhead = uhp;
|
|
|
1004
|
|
|
1005 if (uhp->uh_walk != mark)
|
|
|
1006 break; /* must have reached the target */
|
|
|
1007
|
|
|
1008 /* Stop when going backwards in time and didn't find the exact
|
|
|
1009 * header we were looking for. */
|
|
|
1010 if (uhp->uh_seq == target && above)
|
|
|
1011 {
|
|
|
1012 curbuf->b_u_seq_cur = target - 1;
|
|
|
1013 break;
|
|
|
1014 }
|
|
|
1015
|
|
|
1016 u_undoredo(FALSE);
|
|
|
1017
|
|
|
1018 /* Advance "curhead" to below the header we last used. If it
|
|
|
1019 * becomes NULL then we need to set "newhead" to this leaf. */
|
|
|
1020 if (uhp->uh_prev == NULL)
|
|
|
1021 curbuf->b_u_newhead = uhp;
|
|
|
1022 curbuf->b_u_curhead = uhp->uh_prev;
|
|
|
1023 did_undo = FALSE;
|
|
|
1024
|
|
|
1025 if (uhp->uh_seq == target) /* found it! */
|
|
|
1026 break;
|
|
|
1027
|
|
|
1028 uhp = uhp->uh_prev;
|
|
|
1029 if (uhp == NULL || uhp->uh_walk != mark)
|
|
|
1030 {
|
|
|
1031 /* Need to redo more but can't find it... */
|
|
|
1032 EMSG2(_(e_intern2), "undo_time()");
|
|
|
1033 break;
|
|
|
1034 }
|
|
|
1035 }
|
|
|
1036 }
|
|
|
1037 u_undo_end(did_undo, absolute);
|
|
|
1038 }
|
|
|
1039
|
|
|
1040 /*
|
|
|
1041 * u_undoredo: common code for undo and redo
|
|
|
1042 *
|
|
|
1043 * The lines in the file are replaced by the lines in the entry list at
|
|
|
1044 * curbuf->b_u_curhead. The replaced lines in the file are saved in the entry
|
|
|
1045 * list for the next undo/redo.
|
|
|
1046 *
|
|
|
1047 * When "undo" is TRUE we go up in the tree, when FALSE we go down.
|
|
|
1048 */
|
|
|
1049 static void
|
|
|
1050 u_undoredo(undo)
|
|
|
1051 int undo;
|
|
|
1052 {
|
|
|
1053 char_u **newarray = NULL;
|
|
|
1054 linenr_T oldsize;
|
|
|
1055 linenr_T newsize;
|
|
|
1056 linenr_T top, bot;
|
|
|
1057 linenr_T lnum;
|
|
|
1058 linenr_T newlnum = MAXLNUM;
|
|
|
1059 long i;
|
|
|
1060 u_entry_T *uep, *nuep;
|
|
|
1061 u_entry_T *newlist = NULL;
|
|
|
1062 int old_flags;
|
|
|
1063 int new_flags;
|
|
|
1064 pos_T namedm[NMARKS];
|
|
|
1065 #ifdef FEAT_VISUAL
|
|
|
1066 visualinfo_T visualinfo;
|
|
|
1067 #endif
|
|
|
1068 int empty_buffer; /* buffer became empty */
|
|
|
1069 u_header_T *curhead = curbuf->b_u_curhead;
|
|
|
1070
|
|
|
1071 #ifdef U_DEBUG
|
|
|
1072 u_check(FALSE);
|
|
|
1073 #endif
|
|
|
1074 old_flags = curhead->uh_flags;
|
|
|
1075 new_flags = (curbuf->b_changed ? UH_CHANGED : 0) +
|
|
|
1076 ((curbuf->b_ml.ml_flags & ML_EMPTY) ? UH_EMPTYBUF : 0);
|
|
|
1077 setpcmark();
|
|
|
1078
|
|
|
1079 /*
|
|
|
1080 * save marks before undo/redo
|
|
|
1081 */
|
|
|
1082 mch_memmove(namedm, curbuf->b_namedm, sizeof(pos_T) * NMARKS);
|
|
|
1083 #ifdef FEAT_VISUAL
|
|
|
1084 visualinfo = curbuf->b_visual;
|
|
|
1085 #endif
|
|
|
1086 curbuf->b_op_start.lnum = curbuf->b_ml.ml_line_count;
|
|
|
1087 curbuf->b_op_start.col = 0;
|
|
|
1088 curbuf->b_op_end.lnum = 0;
|
|
|
1089 curbuf->b_op_end.col = 0;
|
|
|
1090
|
|
|
1091 for (uep = curhead->uh_entry; uep != NULL; uep = nuep)
|
|
|
1092 {
|
|
|
1093 top = uep->ue_top;
|
|
|
1094 bot = uep->ue_bot;
|
|
|
1095 if (bot == 0)
|
|
|
1096 bot = curbuf->b_ml.ml_line_count + 1;
|
|
|
1097 if (top > curbuf->b_ml.ml_line_count || top >= bot
|
|
|
1098 || bot > curbuf->b_ml.ml_line_count + 1)
|
|
|
1099 {
|
|
|
1100 EMSG(_("E438: u_undo: line numbers wrong"));
|
|
|
1101 changed(); /* don't want UNCHANGED now */
|
|
|
1102 return;
|
|
|
1103 }
|
|
|
1104
|
|
|
1105 oldsize = bot - top - 1; /* number of lines before undo */
|
|
|
1106 newsize = uep->ue_size; /* number of lines after undo */
|
|
|
1107
|
|
|
1108 if (top < newlnum)
|
|
|
1109 {
|
|
|
1110 /* If the saved cursor is somewhere in this undo block, move it to
|
|
|
1111 * the remembered position. Makes "gwap" put the cursor back
|
|
|
1112 * where it was. */
|
|
|
1113 lnum = curhead->uh_cursor.lnum;
|
|
|
1114 if (lnum >= top && lnum <= top + newsize + 1)
|
|
|
1115 {
|
|
|
1116 curwin->w_cursor = curhead->uh_cursor;
|
|
|
1117 newlnum = curwin->w_cursor.lnum - 1;
|
|
|
1118 }
|
|
|
1119 else
|
|
|
1120 {
|
|
|
1121 /* Use the first line that actually changed. Avoids that
|
|
|
1122 * undoing auto-formatting puts the cursor in the previous
|
|
|
1123 * line. */
|
|
|
1124 for (i = 0; i < newsize && i < oldsize; ++i)
|
|
|
1125 if (STRCMP(uep->ue_array[i], ml_get(top + 1 + i)) != 0)
|
|
|
1126 break;
|
|
|
1127 if (i == newsize && newlnum == MAXLNUM && uep->ue_next == NULL)
|
|
|
1128 {
|
|
|
1129 newlnum = top;
|
|
|
1130 curwin->w_cursor.lnum = newlnum + 1;
|
|
|
1131 }
|
|
|
1132 else if (i < newsize)
|
|
|
1133 {
|
|
|
1134 newlnum = top + i;
|
|
|
1135 curwin->w_cursor.lnum = newlnum + 1;
|
|
|
1136 }
|
|
|
1137 }
|
|
|
1138 }
|
|
|
1139
|
|
|
1140 empty_buffer = FALSE;
|
|
|
1141
|
|
|
1142 /* delete the lines between top and bot and save them in newarray */
|
|
|
1143 if (oldsize > 0)
|
|
|
1144 {
|
|
|
1145 if ((newarray = (char_u **)U_ALLOC_LINE(
|
|
|
1146 (unsigned)(sizeof(char_u *) * oldsize))) == NULL)
|
|
|
1147 {
|
|
|
1148 do_outofmem_msg((long_u)(sizeof(char_u *) * oldsize));
|
|
|
1149 /*
|
|
|
1150 * We have messed up the entry list, repair is impossible.
|
|
|
1151 * we have to free the rest of the list.
|
|
|
1152 */
|
|
|
1153 while (uep != NULL)
|
|
|
1154 {
|
|
|
1155 nuep = uep->ue_next;
|
|
|
1156 u_freeentry(uep, uep->ue_size);
|
|
|
1157 uep = nuep;
|
|
|
1158 }
|
|
|
1159 break;
|
|
|
1160 }
|
|
|
1161 /* delete backwards, it goes faster in most cases */
|
|
|
1162 for (lnum = bot - 1, i = oldsize; --i >= 0; --lnum)
|
|
|
1163 {
|
|
|
1164 /* what can we do when we run out of memory? */
|
|
|
1165 if ((newarray[i] = u_save_line(lnum)) == NULL)
|
|
|
1166 do_outofmem_msg((long_u)0);
|
|
|
1167 /* remember we deleted the last line in the buffer, and a
|
|
|
1168 * dummy empty line will be inserted */
|
|
|
1169 if (curbuf->b_ml.ml_line_count == 1)
|
|
|
1170 empty_buffer = TRUE;
|
|
|
1171 ml_delete(lnum, FALSE);
|
|
|
1172 }
|
|
|
1173 }
|
|
|
1174 else
|
|
|
1175 newarray = NULL;
|
|
|
1176
|
|
|
1177 /* insert the lines in u_array between top and bot */
|
|
|
1178 if (newsize)
|
|
|
1179 {
|
|
|
1180 for (lnum = top, i = 0; i < newsize; ++i, ++lnum)
|
|
|
1181 {
|
|
|
1182 /*
|
|
|
1183 * If the file is empty, there is an empty line 1 that we
|
|
|
1184 * should get rid of, by replacing it with the new line
|
|
|
1185 */
|
|
|
1186 if (empty_buffer && lnum == 0)
|
|
|
1187 ml_replace((linenr_T)1, uep->ue_array[i], TRUE);
|
|
|
1188 else
|
|
|
1189 ml_append(lnum, uep->ue_array[i], (colnr_T)0, FALSE);
|
|
|
1190 U_FREE_LINE(uep->ue_array[i]);
|
|
|
1191 }
|
|
|
1192 U_FREE_LINE((char_u *)uep->ue_array);
|
|
|
1193 }
|
|
|
1194
|
|
|
1195 /* adjust marks */
|
|
|
1196 if (oldsize != newsize)
|
|
|
1197 {
|
|
|
1198 mark_adjust(top + 1, top + oldsize, (long)MAXLNUM,
|
|
|
1199 (long)newsize - (long)oldsize);
|
|
|
1200 if (curbuf->b_op_start.lnum > top + oldsize)
|
|
|
1201 curbuf->b_op_start.lnum += newsize - oldsize;
|
|
|
1202 if (curbuf->b_op_end.lnum > top + oldsize)
|
|
|
1203 curbuf->b_op_end.lnum += newsize - oldsize;
|
|
|
1204 }
|
|
|
1205
|
|
|
1206 changed_lines(top + 1, 0, bot, newsize - oldsize);
|
|
|
1207
|
|
|
1208 /* set '[ and '] mark */
|
|
|
1209 if (top + 1 < curbuf->b_op_start.lnum)
|
|
|
1210 curbuf->b_op_start.lnum = top + 1;
|
|
|
1211 if (newsize == 0 && top + 1 > curbuf->b_op_end.lnum)
|
|
|
1212 curbuf->b_op_end.lnum = top + 1;
|
|
|
1213 else if (top + newsize > curbuf->b_op_end.lnum)
|
|
|
1214 curbuf->b_op_end.lnum = top + newsize;
|
|
|
1215
|
|
|
1216 u_newcount += newsize;
|
|
|
1217 u_oldcount += oldsize;
|
|
|
1218 uep->ue_size = oldsize;
|
|
|
1219 uep->ue_array = newarray;
|
|
|
1220 uep->ue_bot = top + newsize + 1;
|
|
|
1221
|
|
|
1222 /*
|
|
|
1223 * insert this entry in front of the new entry list
|
|
|
1224 */
|
|
|
1225 nuep = uep->ue_next;
|
|
|
1226 uep->ue_next = newlist;
|
|
|
1227 newlist = uep;
|
|
|
1228 }
|
|
|
1229
|
|
|
1230 curhead->uh_entry = newlist;
|
|
|
1231 curhead->uh_flags = new_flags;
|
|
|
1232 if ((old_flags & UH_EMPTYBUF) && bufempty())
|
|
|
1233 curbuf->b_ml.ml_flags |= ML_EMPTY;
|
|
|
1234 if (old_flags & UH_CHANGED)
|
|
|
1235 changed();
|
|
|
1236 else
|
|
|
1237 #ifdef FEAT_NETBEANS_INTG
|
|
|
1238 /* per netbeans undo rules, keep it as modified */
|
|
|
1239 if (!isNetbeansModified(curbuf))
|
|
|
1240 #endif
|
|
|
1241 unchanged(curbuf, FALSE);
|
|
|
1242
|
|
|
1243 /*
|
|
|
1244 * restore marks from before undo/redo
|
|
|
1245 */
|
|
|
1246 for (i = 0; i < NMARKS; ++i)
|
|
|
1247 if (curhead->uh_namedm[i].lnum != 0)
|
|
|
1248 {
|
|
|
1249 curbuf->b_namedm[i] = curhead->uh_namedm[i];
|
|
|
1250 curhead->uh_namedm[i] = namedm[i];
|
|
|
1251 }
|
|
|
1252 #ifdef FEAT_VISUAL
|
|
|
1253 if (curhead->uh_visual.vi_start.lnum != 0)
|
|
|
1254 {
|
|
|
1255 curbuf->b_visual = curhead->uh_visual;
|
|
|
1256 curhead->uh_visual = visualinfo;
|
|
|
1257 }
|
|
|
1258 #endif
|
|
|
1259
|
|
|
1260 /*
|
|
|
1261 * If the cursor is only off by one line, put it at the same position as
|
|
|
1262 * before starting the change (for the "o" command).
|
|
|
1263 * Otherwise the cursor should go to the first undone line.
|
|
|
1264 */
|
|
|
1265 if (curhead->uh_cursor.lnum + 1 == curwin->w_cursor.lnum
|
|
|
1266 && curwin->w_cursor.lnum > 1)
|
|
|
1267 --curwin->w_cursor.lnum;
|
|
|
1268 if (curhead->uh_cursor.lnum == curwin->w_cursor.lnum)
|
|
|
1269 {
|
|
|
1270 curwin->w_cursor.col = curhead->uh_cursor.col;
|
|
|
1271 #ifdef FEAT_VIRTUALEDIT
|
|
|
1272 if (virtual_active() && curhead->uh_cursor_vcol >= 0)
|
|
|
1273 coladvance((colnr_T)curhead->uh_cursor_vcol);
|
|
|
1274 else
|
|
|
1275 curwin->w_cursor.coladd = 0;
|
|
|
1276 #endif
|
|
|
1277 }
|
|
|
1278 else if (curwin->w_cursor.lnum <= curbuf->b_ml.ml_line_count)
|
|
|
1279 beginline(BL_SOL | BL_FIX);
|
|
|
1280 else
|
|
|
1281 {
|
|
|
1282 /* We get here with the current cursor line being past the end (eg
|
|
|
1283 * after adding lines at the end of the file, and then undoing it).
|
|
|
1284 * check_cursor() will move the cursor to the last line. Move it to
|
|
|
1285 * the first column here. */
|
|
|
1286 curwin->w_cursor.col = 0;
|
|
|
1287 #ifdef FEAT_VIRTUALEDIT
|
|
|
1288 curwin->w_cursor.coladd = 0;
|
|
|
1289 #endif
|
|
|
1290 }
|
|
|
1291
|
|
|
1292 /* Make sure the cursor is on an existing line and column. */
|
|
|
1293 check_cursor();
|
|
|
1294
|
|
|
1295 /* Remember where we are for "g-" and ":earlier 10s". */
|
|
|
1296 curbuf->b_u_seq_cur = curhead->uh_seq;
|
|
|
1297 if (undo)
|
|
|
1298 /* We are below the previous undo. However, to make ":earlier 1s"
|
|
|
1299 * work we compute this as being just above the just undone change. */
|
|
|
1300 --curbuf->b_u_seq_cur;
|
|
|
1301
|
|
|
1302 /* The timestamp can be the same for multiple changes, just use the one of
|
|
|
1303 * the undone/redone change. */
|
|
|
1304 curbuf->b_u_seq_time = curhead->uh_time;
|
|
|
1305 #ifdef U_DEBUG
|
|
|
1306 u_check(FALSE);
|
|
|
1307 #endif
|
|
|
1308 }
|
|
|
1309
|
|
|
1310 /*
|
|
|
1311 * If we deleted or added lines, report the number of less/more lines.
|
|
|
1312 * Otherwise, report the number of changes (this may be incorrect
|
|
|
1313 * in some cases, but it's better than nothing).
|
|
|
1314 */
|
|
|
1315 static void
|
|
|
1316 u_undo_end(did_undo, absolute)
|
|
|
1317 int did_undo; /* just did an undo */
|
|
|
1318 int absolute; /* used ":undo N" */
|
|
|
1319 {
|
|
|
1320 char *msgstr;
|
|
|
1321 u_header_T *uhp;
|
|
|
1322 char_u msgbuf[80];
|
|
|
1323
|
|
|
1324 #ifdef FEAT_FOLDING
|
|
|
1325 if ((fdo_flags & FDO_UNDO) && KeyTyped)
|
|
|
1326 foldOpenCursor();
|
|
|
1327 #endif
|
|
|
1328
|
|
|
1329 if (global_busy /* no messages now, wait until global is finished */
|
|
|
1330 || !messaging()) /* 'lazyredraw' set, don't do messages now */
|
|
|
1331 return;
|
|
|
1332
|
|
|
1333 if (curbuf->b_ml.ml_flags & ML_EMPTY)
|
|
|
1334 --u_newcount;
|
|
|
1335
|
|
|
1336 u_oldcount -= u_newcount;
|
|
|
1337 if (u_oldcount == -1)
|
|
|
1338 msgstr = N_("more line");
|
|
|
1339 else if (u_oldcount < 0)
|
|
|
1340 msgstr = N_("more lines");
|
|
|
1341 else if (u_oldcount == 1)
|
|
|
1342 msgstr = N_("line less");
|
|
|
1343 else if (u_oldcount > 1)
|
|
|
1344 msgstr = N_("fewer lines");
|
|
|
1345 else
|
|
|
1346 {
|
|
|
1347 u_oldcount = u_newcount;
|
|
|
1348 if (u_newcount == 1)
|
|
|
1349 msgstr = N_("change");
|
|
|
1350 else
|
|
|
1351 msgstr = N_("changes");
|
|
|
1352 }
|
|
|
1353
|
|
|
1354 if (curbuf->b_u_curhead != NULL)
|
|
|
1355 {
|
|
|
1356 /* For ":undo N" we prefer a "after #N" message. */
|
|
|
1357 if (absolute && curbuf->b_u_curhead->uh_next != NULL)
|
|
|
1358 {
|
|
|
1359 uhp = curbuf->b_u_curhead->uh_next;
|
|
|
1360 did_undo = FALSE;
|
|
|
1361 }
|
|
|
1362 else if (did_undo)
|
|
|
1363 uhp = curbuf->b_u_curhead;
|
|
|
1364 else
|
|
|
1365 uhp = curbuf->b_u_curhead->uh_next;
|
|
|
1366 }
|
|
|
1367 else
|
|
|
1368 uhp = curbuf->b_u_newhead;
|
|
|
1369
|
|
|
1370 if (uhp == NULL)
|
|
|
1371 *msgbuf = NUL;
|
|
|
1372 else
|
|
|
1373 u_add_time(msgbuf, sizeof(msgbuf), uhp->uh_time);
|
|
|
1374
|
|
|
1375 smsg((char_u *)_("%ld %s; %s #%ld %s"),
|
|
|
1376 u_oldcount < 0 ? -u_oldcount : u_oldcount,
|
|
|
1377 _(msgstr),
|
|
|
1378 did_undo ? _("before") : _("after"),
|
|
|
1379 uhp == NULL ? 0L : uhp->uh_seq,
|
|
|
1380 msgbuf);
|
|
|
1381 }
|
|
|
1382
|
|
|
1383 /*
|
|
|
1384 * u_sync: stop adding to the current entry list
|
|
|
1385 */
|
|
|
1386 void
|
|
|
1387 u_sync(force)
|
|
|
1388 int force; /* Also sync when no_u_sync is set. */
|
|
|
1389 {
|
|
|
1390 /* Skip it when already synced or syncing is disabled. */
|
|
|
1391 if (curbuf->b_u_synced || (!force && no_u_sync > 0))
|
|
|
1392 return;
|
|
|
1393 #if defined(FEAT_XIM) && defined(FEAT_GUI_GTK)
|
|
|
1394 if (im_is_preediting())
|
|
|
1395 return; /* XIM is busy, don't break an undo sequence */
|
|
|
1396 #endif
|
|
|
1397 if (p_ul < 0)
|
|
|
1398 curbuf->b_u_synced = TRUE; /* no entries, nothing to do */
|
|
|
1399 else
|
|
|
1400 {
|
|
|
1401 u_getbot(); /* compute ue_bot of previous u_save */
|
|
|
1402 curbuf->b_u_curhead = NULL;
|
|
|
1403 }
|
|
|
1404 }
|
|
|
1405
|
|
|
1406 /*
|
|
|
1407 * ":undolist": List the leafs of the undo tree
|
|
|
1408 */
|
|
|
1409 /*ARGSUSED*/
|
|
|
1410 void
|
|
|
1411 ex_undolist(eap)
|
|
|
1412 exarg_T *eap;
|
|
|
1413 {
|
|
|
1414 garray_T ga;
|
|
|
1415 u_header_T *uhp;
|
|
|
1416 int mark;
|
|
|
1417 int nomark;
|
|
|
1418 int changes = 1;
|
|
|
1419 int i;
|
|
|
1420
|
|
|
1421 /*
|
|
|
1422 * 1: walk the tree to find all leafs, put the info in "ga".
|
|
|
1423 * 2: sort the lines
|
|
|
1424 * 3: display the list
|
|
|
1425 */
|
|
|
1426 mark = ++lastmark;
|
|
|
1427 nomark = ++lastmark;
|
|
|
1428 ga_init2(&ga, (int)sizeof(char *), 20);
|
|
|
1429
|
|
|
1430 uhp = curbuf->b_u_oldhead;
|
|
|
1431 while (uhp != NULL)
|
|
|
1432 {
|
|
|
1433 if (uhp->uh_prev == NULL && uhp->uh_walk != nomark
|
|
|
1434 && uhp->uh_walk != mark)
|
|
|
1435 {
|
|
|
1436 if (ga_grow(&ga, 1) == FAIL)
|
|
|
1437 break;
|
|
|
1438 vim_snprintf((char *)IObuff, IOSIZE, "%6ld %7ld ",
|
|
|
1439 uhp->uh_seq, changes);
|
|
|
1440 u_add_time(IObuff + STRLEN(IObuff), IOSIZE - STRLEN(IObuff),
|
|
|
1441 uhp->uh_time);
|
|
|
1442 ((char_u **)(ga.ga_data))[ga.ga_len++] = vim_strsave(IObuff);
|
|
|
1443 }
|
|
|
1444
|
|
|
1445 uhp->uh_walk = mark;
|
|
|
1446
|
|
|
1447 /* go down in the tree if we haven't been there */
|
|
|
1448 if (uhp->uh_prev != NULL && uhp->uh_prev->uh_walk != nomark
|
|
|
1449 && uhp->uh_prev->uh_walk != mark)
|
|
|
1450 {
|
|
|
1451 uhp = uhp->uh_prev;
|
|
|
1452 ++changes;
|
|
|
1453 }
|
|
|
1454
|
|
|
1455 /* go to alternate branch if we haven't been there */
|
|
|
1456 else if (uhp->uh_alt_next != NULL
|
|
|
1457 && uhp->uh_alt_next->uh_walk != nomark
|
|
|
1458 && uhp->uh_alt_next->uh_walk != mark)
|
|
|
1459 uhp = uhp->uh_alt_next;
|
|
|
1460
|
|
|
1461 /* go up in the tree if we haven't been there and we are at the
|
|
|
1462 * start of alternate branches */
|
|
|
1463 else if (uhp->uh_next != NULL && uhp->uh_alt_prev == NULL
|
|
|
1464 && uhp->uh_next->uh_walk != nomark
|
|
|
1465 && uhp->uh_next->uh_walk != mark)
|
|
|
1466 {
|
|
|
1467 uhp = uhp->uh_next;
|
|
|
1468 --changes;
|
|
|
1469 }
|
|
|
1470
|
|
|
1471 else
|
|
|
1472 {
|
|
|
1473 /* need to backtrack; mark this node as done */
|
|
|
1474 uhp->uh_walk = nomark;
|
|
|
1475 if (uhp->uh_alt_prev != NULL)
|
|
|
1476 uhp = uhp->uh_alt_prev;
|
|
|
1477 else
|
|
|
1478 {
|
|
|
1479 uhp = uhp->uh_next;
|
|
|
1480 --changes;
|
|
|
1481 }
|
|
|
1482 }
|
|
|
1483 }
|
|
|
1484
|
|
|
1485 if (ga.ga_len == 0)
|
|
|
1486 MSG(_("Nothing to undo"));
|
|
|
1487 else
|
|
|
1488 {
|
|
|
1489 sort_strings((char_u **)ga.ga_data, ga.ga_len);
|
|
|
1490
|
|
|
1491 msg_start();
|
|
|
1492 msg_puts_attr((char_u *)_("number changes time"), hl_attr(HLF_T));
|
|
|
1493 for (i = 0; i < ga.ga_len && !got_int; ++i)
|
|
|
1494 {
|
|
|
1495 msg_putchar('\n');
|
|
|
1496 if (got_int)
|
|
|
1497 break;
|
|
|
1498 msg_puts(((char_u **)ga.ga_data)[i]);
|
|
|
1499 }
|
|
|
1500 msg_end();
|
|
|
1501
|
|
|
1502 ga_clear_strings(&ga);
|
|
|
1503 }
|
|
|
1504 }
|
|
|
1505
|
|
|
1506 /*
|
|
|
1507 * Put the timestamp of an undo header in "buf[buflen]" in a nice format.
|
|
|
1508 */
|
|
|
1509 static void
|
|
|
1510 u_add_time(buf, buflen, tt)
|
|
|
1511 char_u *buf;
|
|
|
1512 size_t buflen;
|
|
|
1513 time_t tt;
|
|
|
1514 {
|
|
|
1515 #ifdef HAVE_STRFTIME
|
|
|
1516 struct tm *curtime;
|
|
|
1517
|
|
|
1518 if (time(NULL) - tt >= 100)
|
|
|
1519 {
|
|
|
1520 curtime = localtime(&tt);
|
|
|
1521 (void)strftime((char *)buf, buflen, "%H:%M:%S", curtime);
|
|
|
1522 }
|
|
|
1523 else
|
|
|
1524 #endif
|
|
|
1525 vim_snprintf((char *)buf, buflen, _("%ld seconds ago"),
|
|
|
1526 (long)(time(NULL) - tt));
|
|
|
1527 }
|
|
|
1528
|
|
|
1529 /*
|
|
|
1530 * ":undojoin": continue adding to the last entry list
|
|
|
1531 */
|
|
|
1532 /*ARGSUSED*/
|
|
|
1533 void
|
|
|
1534 ex_undojoin(eap)
|
|
|
1535 exarg_T *eap;
|
|
|
1536 {
|
|
|
1537 if (curbuf->b_u_newhead == NULL)
|
|
|
1538 return; /* nothing changed before */
|
|
|
1539 if (curbuf->b_u_curhead != NULL)
|
|
|
1540 {
|
|
|
1541 EMSG(_("E790: undojoin is not allowed after undo"));
|
|
|
1542 return;
|
|
|
1543 }
|
|
|
1544 if (!curbuf->b_u_synced)
|
|
|
1545 return; /* already unsynced */
|
|
|
1546 if (p_ul < 0)
|
|
|
1547 return; /* no entries, nothing to do */
|
|
|
1548 else
|
|
|
1549 {
|
|
|
1550 /* Go back to the last entry */
|
|
|
1551 curbuf->b_u_curhead = curbuf->b_u_newhead;
|
|
|
1552 curbuf->b_u_synced = FALSE; /* no entries, nothing to do */
|
|
|
1553 }
|
|
|
1554 }
|
|
|
1555
|
|
|
1556 /*
|
|
|
1557 * Called after writing the file and setting b_changed to FALSE.
|
|
|
1558 * Now an undo means that the buffer is modified.
|
|
|
1559 */
|
|
|
1560 void
|
|
|
1561 u_unchanged(buf)
|
|
|
1562 buf_T *buf;
|
|
|
1563 {
|
|
|
1564 u_unch_branch(buf->b_u_oldhead);
|
|
|
1565 buf->b_did_warn = FALSE;
|
|
|
1566 }
|
|
|
1567
|
|
|
1568 static void
|
|
|
1569 u_unch_branch(uhp)
|
|
|
1570 u_header_T *uhp;
|
|
|
1571 {
|
|
|
1572 u_header_T *uh;
|
|
|
1573
|
|
|
1574 for (uh = uhp; uh != NULL; uh = uh->uh_prev)
|
|
|
1575 {
|
|
|
1576 uh->uh_flags |= UH_CHANGED;
|
|
|
1577 if (uh->uh_alt_next != NULL)
|
|
|
1578 u_unch_branch(uh->uh_alt_next); /* recursive */
|
|
|
1579 }
|
|
|
1580 }
|
|
|
1581
|
|
|
1582 /*
|
|
|
1583 * Get pointer to last added entry.
|
|
|
1584 * If it's not valid, give an error message and return NULL.
|
|
|
1585 */
|
|
|
1586 static u_entry_T *
|
|
|
1587 u_get_headentry()
|
|
|
1588 {
|
|
|
1589 if (curbuf->b_u_newhead == NULL || curbuf->b_u_newhead->uh_entry == NULL)
|
|
|
1590 {
|
|
|
1591 EMSG(_("E439: undo list corrupt"));
|
|
|
1592 return NULL;
|
|
|
1593 }
|
|
|
1594 return curbuf->b_u_newhead->uh_entry;
|
|
|
1595 }
|
|
|
1596
|
|
|
1597 /*
|
|
|
1598 * u_getbot(): compute the line number of the previous u_save
|
|
|
1599 * It is called only when b_u_synced is FALSE.
|
|
|
1600 */
|
|
|
1601 static void
|
|
|
1602 u_getbot()
|
|
|
1603 {
|
|
|
1604 u_entry_T *uep;
|
|
|
1605 linenr_T extra;
|
|
|
1606
|
|
|
1607 uep = u_get_headentry(); /* check for corrupt undo list */
|
|
|
1608 if (uep == NULL)
|
|
|
1609 return;
|
|
|
1610
|
|
|
1611 uep = curbuf->b_u_newhead->uh_getbot_entry;
|
|
|
1612 if (uep != NULL)
|
|
|
1613 {
|
|
|
1614 /*
|
|
|
1615 * the new ue_bot is computed from the number of lines that has been
|
|
|
1616 * inserted (0 - deleted) since calling u_save. This is equal to the
|
|
|
1617 * old line count subtracted from the current line count.
|
|
|
1618 */
|
|
|
1619 extra = curbuf->b_ml.ml_line_count - uep->ue_lcount;
|
|
|
1620 uep->ue_bot = uep->ue_top + uep->ue_size + 1 + extra;
|
|
|
1621 if (uep->ue_bot < 1 || uep->ue_bot > curbuf->b_ml.ml_line_count)
|
|
|
1622 {
|
|
|
1623 EMSG(_("E440: undo line missing"));
|
|
|
1624 uep->ue_bot = uep->ue_top + 1; /* assume all lines deleted, will
|
|
|
1625 * get all the old lines back
|
|
|
1626 * without deleting the current
|
|
|
1627 * ones */
|
|
|
1628 }
|
|
|
1629
|
|
|
1630 curbuf->b_u_newhead->uh_getbot_entry = NULL;
|
|
|
1631 }
|
|
|
1632
|
|
|
1633 curbuf->b_u_synced = TRUE;
|
|
|
1634 }
|
|
|
1635
|
|
|
1636 /*
|
|
|
1637 * Free one header "uhp" and its entry list and adjust the pointers.
|
|
|
1638 */
|
|
|
1639 static void
|
|
|
1640 u_freeheader(buf, uhp, uhpp)
|
|
|
1641 buf_T *buf;
|
|
|
1642 u_header_T *uhp;
|
|
|
1643 u_header_T **uhpp; /* if not NULL reset when freeing this header */
|
|
|
1644 {
|
|
|
1645 u_header_T *uhap;
|
|
|
1646
|
|
|
1647 /* When there is an alternate redo list free that branch completely,
|
|
|
1648 * because we can never go there. */
|
|
|
1649 if (uhp->uh_alt_next != NULL)
|
|
|
1650 u_freebranch(buf, uhp->uh_alt_next, uhpp);
|
|
|
1651
|
|
|
1652 if (uhp->uh_alt_prev != NULL)
|
|
|
1653 uhp->uh_alt_prev->uh_alt_next = NULL;
|
|
|
1654
|
|
|
1655 /* Update the links in the list to remove the header. */
|
|
|
1656 if (uhp->uh_next == NULL)
|
|
|
1657 buf->b_u_oldhead = uhp->uh_prev;
|
|
|
1658 else
|
|
|
1659 uhp->uh_next->uh_prev = uhp->uh_prev;
|
|
|
1660
|
|
|
1661 if (uhp->uh_prev == NULL)
|
|
|
1662 buf->b_u_newhead = uhp->uh_next;
|
|
|
1663 else
|
|
|
1664 for (uhap = uhp->uh_prev; uhap != NULL; uhap = uhap->uh_alt_next)
|
|
|
1665 uhap->uh_next = uhp->uh_next;
|
|
|
1666
|
|
|
1667 u_freeentries(buf, uhp, uhpp);
|
|
|
1668 }
|
|
|
1669
|
|
|
1670 /*
|
|
|
1671 * Free an alternate branch and any following alternate branches.
|
|
|
1672 */
|
|
|
1673 static void
|
|
|
1674 u_freebranch(buf, uhp, uhpp)
|
|
|
1675 buf_T *buf;
|
|
|
1676 u_header_T *uhp;
|
|
|
1677 u_header_T **uhpp; /* if not NULL reset when freeing this header */
|
|
|
1678 {
|
|
|
1679 u_header_T *tofree, *next;
|
|
|
1680
|
|
|
1681 if (uhp->uh_alt_prev != NULL)
|
|
|
1682 uhp->uh_alt_prev->uh_alt_next = NULL;
|
|
|
1683
|
|
|
1684 next = uhp;
|
|
|
1685 while (next != NULL)
|
|
|
1686 {
|
|
|
1687 tofree = next;
|
|
|
1688 if (tofree->uh_alt_next != NULL)
|
|
|
1689 u_freebranch(buf, tofree->uh_alt_next, uhpp); /* recursive */
|
|
|
1690 next = tofree->uh_prev;
|
|
|
1691 u_freeentries(buf, tofree, uhpp);
|
|
|
1692 }
|
|
|
1693 }
|
|
|
1694
|
|
|
1695 /*
|
|
|
1696 * Free all the undo entries for one header and the header itself.
|
|
|
1697 * This means that "uhp" is invalid when returning.
|
|
|
1698 */
|
|
|
1699 static void
|
|
|
1700 u_freeentries(buf, uhp, uhpp)
|
|
|
1701 buf_T *buf;
|
|
|
1702 u_header_T *uhp;
|
|
|
1703 u_header_T **uhpp; /* if not NULL reset when freeing this header */
|
|
|
1704 {
|
|
|
1705 u_entry_T *uep, *nuep;
|
|
|
1706
|
|
|
1707 /* Check for pointers to the header that become invalid now. */
|
|
|
1708 if (buf->b_u_curhead == uhp)
|
|
|
1709 buf->b_u_curhead = NULL;
|
|
|
1710 if (buf->b_u_newhead == uhp)
|
|
|
1711 buf->b_u_newhead = NULL; /* freeing the newest entry */
|
|
|
1712 if (uhpp != NULL && uhp == *uhpp)
|
|
|
1713 *uhpp = NULL;
|
|
|
1714
|
|
|
1715 for (uep = uhp->uh_entry; uep != NULL; uep = nuep)
|
|
|
1716 {
|
|
|
1717 nuep = uep->ue_next;
|
|
|
1718 u_freeentry(uep, uep->ue_size);
|
|
|
1719 }
|
|
|
1720
|
|
|
1721 #ifdef U_DEBUG
|
|
|
1722 uhp->uh_magic = 0;
|
|
|
1723 #endif
|
|
|
1724 U_FREE_LINE((char_u *)uhp);
|
|
|
1725 --buf->b_u_numhead;
|
|
|
1726 }
|
|
|
1727
|
|
|
1728 /*
|
|
|
1729 * free entry 'uep' and 'n' lines in uep->ue_array[]
|
|
|
1730 */
|
|
|
1731 static void
|
|
|
1732 u_freeentry(uep, n)
|
|
|
1733 u_entry_T *uep;
|
|
|
1734 long n;
|
|
|
1735 {
|
|
|
1736 while (n > 0)
|
|
|
1737 U_FREE_LINE(uep->ue_array[--n]);
|
|
|
1738 U_FREE_LINE((char_u *)uep->ue_array);
|
|
|
1739 #ifdef U_DEBUG
|
|
|
1740 uep->ue_magic = 0;
|
|
|
1741 #endif
|
|
|
1742 U_FREE_LINE((char_u *)uep);
|
|
|
1743 }
|
|
|
1744
|
|
|
1745 /*
|
|
|
1746 * invalidate the undo buffer; called when storage has already been released
|
|
|
1747 */
|
|
|
1748 void
|
|
|
1749 u_clearall(buf)
|
|
|
1750 buf_T *buf;
|
|
|
1751 {
|
|
|
1752 buf->b_u_newhead = buf->b_u_oldhead = buf->b_u_curhead = NULL;
|
|
|
1753 buf->b_u_synced = TRUE;
|
|
|
1754 buf->b_u_numhead = 0;
|
|
|
1755 buf->b_u_line_ptr = NULL;
|
|
|
1756 buf->b_u_line_lnum = 0;
|
|
|
1757 }
|
|
|
1758
|
|
|
1759 /*
|
|
|
1760 * save the line "lnum" for the "U" command
|
|
|
1761 */
|
|
|
1762 void
|
|
|
1763 u_saveline(lnum)
|
|
|
1764 linenr_T lnum;
|
|
|
1765 {
|
|
|
1766 if (lnum == curbuf->b_u_line_lnum) /* line is already saved */
|
|
|
1767 return;
|
|
|
1768 if (lnum < 1 || lnum > curbuf->b_ml.ml_line_count) /* should never happen */
|
|
|
1769 return;
|
|
|
1770 u_clearline();
|
|
|
1771 curbuf->b_u_line_lnum = lnum;
|
|
|
1772 if (curwin->w_cursor.lnum == lnum)
|
|
|
1773 curbuf->b_u_line_colnr = curwin->w_cursor.col;
|
|
|
1774 else
|
|
|
1775 curbuf->b_u_line_colnr = 0;
|
|
|
1776 if ((curbuf->b_u_line_ptr = u_save_line(lnum)) == NULL)
|
|
|
1777 do_outofmem_msg((long_u)0);
|
|
|
1778 }
|
|
|
1779
|
|
|
1780 /*
|
|
|
1781 * clear the line saved for the "U" command
|
|
|
1782 * (this is used externally for crossing a line while in insert mode)
|
|
|
1783 */
|
|
|
1784 void
|
|
|
1785 u_clearline()
|
|
|
1786 {
|
|
|
1787 if (curbuf->b_u_line_ptr != NULL)
|
|
|
1788 {
|
|
|
1789 U_FREE_LINE(curbuf->b_u_line_ptr);
|
|
|
1790 curbuf->b_u_line_ptr = NULL;
|
|
|
1791 curbuf->b_u_line_lnum = 0;
|
|
|
1792 }
|
|
|
1793 }
|
|
|
1794
|
|
|
1795 /*
|
|
|
1796 * Implementation of the "U" command.
|
|
|
1797 * Differentiation from vi: "U" can be undone with the next "U".
|
|
|
1798 * We also allow the cursor to be in another line.
|
|
|
1799 */
|
|
|
1800 void
|
|
|
1801 u_undoline()
|
|
|
1802 {
|
|
|
1803 colnr_T t;
|
|
|
1804 char_u *oldp;
|
|
|
1805
|
|
|
1806 if (undo_off)
|
|
|
1807 return;
|
|
|
1808
|
|
|
1809 if (curbuf->b_u_line_ptr == NULL ||
|
|
|
1810 curbuf->b_u_line_lnum > curbuf->b_ml.ml_line_count)
|
|
|
1811 {
|
|
|
1812 beep_flush();
|
|
|
1813 return;
|
|
|
1814 }
|
|
|
1815 /* first save the line for the 'u' command */
|
|
|
1816 if (u_savecommon(curbuf->b_u_line_lnum - 1,
|
|
|
1817 curbuf->b_u_line_lnum + 1, (linenr_T)0) == FAIL)
|
|
|
1818 return;
|
|
|
1819 oldp = u_save_line(curbuf->b_u_line_lnum);
|
|
|
1820 if (oldp == NULL)
|
|
|
1821 {
|
|
|
1822 do_outofmem_msg((long_u)0);
|
|
|
1823 return;
|
|
|
1824 }
|
|
|
1825 ml_replace(curbuf->b_u_line_lnum, curbuf->b_u_line_ptr, TRUE);
|
|
|
1826 changed_bytes(curbuf->b_u_line_lnum, 0);
|
|
|
1827 U_FREE_LINE(curbuf->b_u_line_ptr);
|
|
|
1828 curbuf->b_u_line_ptr = oldp;
|
|
|
1829
|
|
|
1830 t = curbuf->b_u_line_colnr;
|
|
|
1831 if (curwin->w_cursor.lnum == curbuf->b_u_line_lnum)
|
|
|
1832 curbuf->b_u_line_colnr = curwin->w_cursor.col;
|
|
|
1833 curwin->w_cursor.col = t;
|
|
|
1834 curwin->w_cursor.lnum = curbuf->b_u_line_lnum;
|
|
|
1835 }
|
|
|
1836
|
|
|
1837 /*
|
|
|
1838 * There are two implementations of the memory management for undo:
|
|
|
1839 * 1. Use the standard malloc()/free() functions.
|
|
|
1840 * This should be fast for allocating memory, but when a buffer is
|
|
|
1841 * abandoned every single allocated chunk must be freed, which may be slow.
|
|
|
1842 * 2. Allocate larger blocks of memory and keep track of chunks ourselves.
|
|
|
1843 * This is fast for abandoning, but the use of linked lists is slow for
|
|
|
1844 * finding a free chunk. Esp. when a lot of lines are changed or deleted.
|
|
|
1845 * A bit of profiling showed that the first method is faster, especially when
|
|
|
1846 * making a large number of changes, under the condition that malloc()/free()
|
|
|
1847 * is implemented efficiently.
|
|
|
1848 */
|
|
|
1849 #ifdef U_USE_MALLOC
|
|
|
1850 /*
|
|
|
1851 * Version of undo memory allocation using malloc()/free()
|
|
|
1852 *
|
|
|
1853 * U_FREE_LINE() and U_ALLOC_LINE() are macros that invoke vim_free() and
|
|
|
1854 * lalloc() directly.
|
|
|
1855 */
|
|
|
1856
|
|
|
1857 /*
|
|
|
1858 * Free all allocated memory blocks for the buffer 'buf'.
|
|
|
1859 */
|
|
|
1860 void
|
|
|
1861 u_blockfree(buf)
|
|
|
1862 buf_T *buf;
|
|
|
1863 {
|
|
|
1864 while (buf->b_u_oldhead != NULL)
|
|
|
1865 u_freeheader(buf, buf->b_u_oldhead, NULL);
|
|
|
1866 U_FREE_LINE(buf->b_u_line_ptr);
|
|
|
1867 }
|
|
|
1868
|
|
|
1869 #else
|
|
|
1870 /*
|
|
|
1871 * Storage allocation for the undo lines and blocks of the current file.
|
|
|
1872 * Version where Vim keeps track of the available memory.
|
|
|
1873 */
|
|
|
1874
|
|
|
1875 /*
|
|
|
1876 * Memory is allocated in relatively large blocks. These blocks are linked
|
|
|
1877 * in the allocated block list, headed by curbuf->b_block_head. They are all
|
|
|
1878 * freed when abandoning a file, so we don't have to free every single line.
|
|
|
1879 * The list is kept sorted on memory address.
|
|
|
1880 * block_alloc() allocates a block.
|
|
|
1881 * m_blockfree() frees all blocks.
|
|
|
1882 *
|
|
|
1883 * The available chunks of memory are kept in free chunk lists. There is
|
|
|
1884 * one free list for each block of allocated memory. The list is kept sorted
|
|
|
1885 * on memory address.
|
|
|
1886 * u_alloc_line() gets a chunk from the free lists.
|
|
|
1887 * u_free_line() returns a chunk to the free lists.
|
|
|
1888 * curbuf->b_m_search points to the chunk before the chunk that was
|
|
|
1889 * freed/allocated the last time.
|
|
|
1890 * curbuf->b_mb_current points to the b_head where curbuf->b_m_search
|
|
|
1891 * points into the free list.
|
|
|
1892 *
|
|
|
1893 *
|
|
|
1894 * b_block_head /---> block #1 /---> block #2
|
|
|
1895 * mb_next ---/ mb_next ---/ mb_next ---> NULL
|
|
|
1896 * mb_info mb_info mb_info
|
|
|
1897 * | | |
|
|
|
1898 * V V V
|
|
|
1899 * NULL free chunk #1.1 free chunk #2.1
|
|
|
1900 * | |
|
|
|
1901 * V V
|
|
|
1902 * free chunk #1.2 NULL
|
|
|
1903 * |
|
|
|
1904 * V
|
|
|
1905 * NULL
|
|
|
1906 *
|
|
|
1907 * When a single free chunk list would have been used, it could take a lot
|
|
|
1908 * of time in u_free_line() to find the correct place to insert a chunk in the
|
|
|
1909 * free list. The single free list would become very long when many lines are
|
|
|
1910 * changed (e.g. with :%s/^M$//).
|
|
|
1911 */
|
|
|
1912
|
|
|
1913 /*
|
|
|
1914 * this blocksize is used when allocating new lines
|
|
|
1915 */
|
|
|
1916 #define MEMBLOCKSIZE 2044
|
|
|
1917
|
|
|
1918 /*
|
|
|
1919 * The size field contains the size of the chunk, including the size field
|
|
|
1920 * itself.
|
|
|
1921 *
|
|
|
1922 * When the chunk is not in-use it is preceded with the m_info structure.
|
|
|
1923 * The m_next field links it in one of the free chunk lists.
|
|
|
1924 *
|
|
|
1925 * On most unix systems structures have to be longword (32 or 64 bit) aligned.
|
|
|
1926 * On most other systems they are short (16 bit) aligned.
|
|
|
1927 */
|
|
|
1928
|
|
|
1929 /* the structure definitions are now in structs.h */
|
|
|
1930
|
|
|
1931 #ifdef ALIGN_LONG
|
|
|
1932 /* size of m_size */
|
|
|
1933 # define M_OFFSET (sizeof(long_u))
|
|
|
1934 #else
|
|
|
1935 /* size of m_size */
|
|
|
1936 # define M_OFFSET (sizeof(short_u))
|
|
|
1937 #endif
|
|
|
1938
|
|
|
1939 static char_u *u_blockalloc __ARGS((long_u));
|
|
|
1940
|
|
|
1941 /*
|
|
|
1942 * Allocate a block of memory and link it in the allocated block list.
|
|
|
1943 */
|
|
|
1944 static char_u *
|
|
|
1945 u_blockalloc(size)
|
|
|
1946 long_u size;
|
|
|
1947 {
|
|
|
1948 mblock_T *p;
|
|
|
1949 mblock_T *mp, *next;
|
|
|
1950
|
|
|
1951 p = (mblock_T *)lalloc(size + sizeof(mblock_T), FALSE);
|
|
|
1952 if (p != NULL)
|
|
|
1953 {
|
|
|
1954 /* Insert the block into the allocated block list, keeping it
|
|
|
1955 sorted on address. */
|
|
|
1956 for (mp = &curbuf->b_block_head;
|
|
|
1957 (next = mp->mb_next) != NULL && next < p;
|
|
|
1958 mp = next)
|
|
|
1959 ;
|
|
|
1960 p->mb_next = next; /* link in block list */
|
|
|
1961 p->mb_size = size;
|
|
|
1962 p->mb_maxsize = 0; /* nothing free yet */
|
|
|
1963 mp->mb_next = p;
|
|
|
1964 p->mb_info.m_next = NULL; /* clear free list */
|
|
|
1965 p->mb_info.m_size = 0;
|
|
|
1966 curbuf->b_mb_current = p; /* remember current block */
|
|
|
1967 curbuf->b_m_search = NULL;
|
|
|
1968 p++; /* return usable memory */
|
|
|
1969 }
|
|
|
1970 return (char_u *)p;
|
|
|
1971 }
|
|
|
1972
|
|
|
1973 /*
|
|
|
1974 * free all allocated memory blocks for the buffer 'buf'
|
|
|
1975 */
|
|
|
1976 void
|
|
|
1977 u_blockfree(buf)
|
|
|
1978 buf_T *buf;
|
|
|
1979 {
|
|
|
1980 mblock_T *p, *np;
|
|
|
1981
|
|
|
1982 for (p = buf->b_block_head.mb_next; p != NULL; p = np)
|
|
|
1983 {
|
|
|
1984 np = p->mb_next;
|
|
|
1985 vim_free(p);
|
|
|
1986 }
|
|
|
1987 buf->b_block_head.mb_next = NULL;
|
|
|
1988 buf->b_m_search = NULL;
|
|
|
1989 buf->b_mb_current = NULL;
|
|
|
1990 }
|
|
|
1991
|
|
|
1992 /*
|
|
|
1993 * Free a chunk of memory for the current buffer.
|
|
|
1994 * Insert the chunk into the correct free list, keeping it sorted on address.
|
|
|
1995 */
|
|
|
1996 static void
|
|
|
1997 u_free_line(ptr, keep)
|
|
|
1998 char_u *ptr;
|
|
|
1999 int keep; /* don't free the block when it's empty */
|
|
|
2000 {
|
|
|
2001 minfo_T *next;
|
|
|
2002 minfo_T *prev, *curr;
|
|
|
2003 minfo_T *mp;
|
|
|
2004 mblock_T *nextb;
|
|
|
2005 mblock_T *prevb;
|
|
|
2006 long_u maxsize;
|
|
|
2007
|
|
|
2008 if (ptr == NULL || ptr == IObuff)
|
|
|
2009 return; /* illegal address can happen in out-of-memory situations */
|
|
|
2010
|
|
|
2011 mp = (minfo_T *)(ptr - M_OFFSET);
|
|
|
2012
|
|
|
2013 /* find block where chunk could be a part off */
|
|
|
2014 /* if we change curbuf->b_mb_current, curbuf->b_m_search is set to NULL */
|
|
|
2015 if (curbuf->b_mb_current == NULL || mp < (minfo_T *)curbuf->b_mb_current)
|
|
|
2016 {
|
|
|
2017 curbuf->b_mb_current = curbuf->b_block_head.mb_next;
|
|
|
2018 curbuf->b_m_search = NULL;
|
|
|
2019 }
|
|
|
2020 if ((nextb = curbuf->b_mb_current->mb_next) != NULL
|
|
|
2021 && (minfo_T *)nextb < mp)
|
|
|
2022 {
|
|
|
2023 curbuf->b_mb_current = nextb;
|
|
|
2024 curbuf->b_m_search = NULL;
|
|
|
2025 }
|
|
|
2026 while ((nextb = curbuf->b_mb_current->mb_next) != NULL
|
|
|
2027 && (minfo_T *)nextb < mp)
|
|
|
2028 curbuf->b_mb_current = nextb;
|
|
|
2029
|
|
|
2030 curr = NULL;
|
|
|
2031 /*
|
|
|
2032 * If mp is smaller than curbuf->b_m_search->m_next go to the start of
|
|
|
2033 * the free list
|
|
|
2034 */
|
|
|
2035 if (curbuf->b_m_search == NULL || mp < (curbuf->b_m_search->m_next))
|
|
|
2036 next = &(curbuf->b_mb_current->mb_info);
|
|
|
2037 else
|
|
|
2038 next = curbuf->b_m_search;
|
|
|
2039 /*
|
|
|
2040 * The following loop is executed very often.
|
|
|
2041 * Therefore it has been optimized at the cost of readability.
|
|
|
2042 * Keep it fast!
|
|
|
2043 */
|
|
|
2044 #ifdef SLOW_BUT_EASY_TO_READ
|
|
|
2045 do
|
|
|
2046 {
|
|
|
2047 prev = curr;
|
|
|
2048 curr = next;
|
|
|
2049 next = next->m_next;
|
|
|
2050 }
|
|
|
2051 while (mp > next && next != NULL);
|
|
|
2052 #else
|
|
|
2053 do /* first, middle, last */
|
|
|
2054 {
|
|
|
2055 prev = next->m_next; /* curr, next, prev */
|
|
|
2056 if (prev == NULL || mp <= prev)
|
|
|
2057 {
|
|
|
2058 prev = curr;
|
|
|
2059 curr = next;
|
|
|
2060 next = next->m_next;
|
|
|
2061 break;
|
|
|
2062 }
|
|
|
2063 curr = prev->m_next; /* next, prev, curr */
|
|
|
2064 if (curr == NULL || mp <= curr)
|
|
|
2065 {
|
|
|
2066 prev = next;
|
|
|
2067 curr = prev->m_next;
|
|
|
2068 next = curr->m_next;
|
|
|
2069 break;
|
|
|
2070 }
|
|
|
2071 next = curr->m_next; /* prev, curr, next */
|
|
|
2072 }
|
|
|
2073 while (mp > next && next != NULL);
|
|
|
2074 #endif
|
|
|
2075
|
|
|
2076 /* if *mp and *next are concatenated, join them into one chunk */
|
|
|
2077 if ((char_u *)mp + mp->m_size == (char_u *)next)
|
|
|
2078 {
|
|
|
2079 mp->m_size += next->m_size;
|
|
|
2080 mp->m_next = next->m_next;
|
|
|
2081 }
|
|
|
2082 else
|
|
|
2083 mp->m_next = next;
|
|
|
2084 maxsize = mp->m_size;
|
|
|
2085
|
|
|
2086 /* if *curr and *mp are concatenated, join them */
|
|
|
2087 if (prev != NULL && (char_u *)curr + curr->m_size == (char_u *)mp)
|
|
|
2088 {
|
|
|
2089 curr->m_size += mp->m_size;
|
|
|
2090 maxsize = curr->m_size;
|
|
|
2091 curr->m_next = mp->m_next;
|
|
|
2092 curbuf->b_m_search = prev;
|
|
|
2093 }
|
|
|
2094 else
|
|
|
2095 {
|
|
|
2096 curr->m_next = mp;
|
|
|
2097 curbuf->b_m_search = curr; /* put curbuf->b_m_search before freed
|
|
|
2098 chunk */
|
|
|
2099 }
|
|
|
2100
|
|
|
2101 /*
|
|
|
2102 * If the block only contains free memory now, release it.
|
|
|
2103 */
|
|
|
2104 if (!keep && curbuf->b_mb_current->mb_size
|
|
|
2105 == curbuf->b_mb_current->mb_info.m_next->m_size)
|
|
|
2106 {
|
|
|
2107 /* Find the block before the current one to be able to unlink it from
|
|
|
2108 * the list of blocks. */
|
|
|
2109 prevb = &curbuf->b_block_head;
|
|
|
2110 for (nextb = prevb->mb_next; nextb != curbuf->b_mb_current;
|
|
|
2111 nextb = nextb->mb_next)
|
|
|
2112 prevb = nextb;
|
|
|
2113 prevb->mb_next = nextb->mb_next;
|
|
|
2114 vim_free(nextb);
|
|
|
2115 curbuf->b_mb_current = NULL;
|
|
|
2116 curbuf->b_m_search = NULL;
|
|
|
2117 }
|
|
|
2118 else if (curbuf->b_mb_current->mb_maxsize < maxsize)
|
|
|
2119 curbuf->b_mb_current->mb_maxsize = maxsize;
|
|
|
2120 }
|
|
|
2121
|
|
|
2122 /*
|
|
|
2123 * Allocate and initialize a new line structure with room for at least
|
|
|
2124 * 'size' characters plus a terminating NUL.
|
|
|
2125 */
|
|
|
2126 static char_u *
|
|
|
2127 u_alloc_line(size)
|
|
|
2128 unsigned size;
|
|
|
2129 {
|
|
|
2130 minfo_T *mp, *mprev, *mp2;
|
|
|
2131 mblock_T *mbp;
|
|
|
2132 int size_align;
|
|
|
2133
|
|
|
2134 /*
|
|
|
2135 * Add room for size field and trailing NUL byte.
|
|
|
2136 * Adjust for minimal size (must be able to store minfo_T
|
|
|
2137 * plus a trailing NUL, so the chunk can be released again)
|
|
|
2138 */
|
|
|
2139 size += M_OFFSET + 1;
|
|
|
2140 if (size < sizeof(minfo_T) + 1)
|
|
|
2141 size = sizeof(minfo_T) + 1;
|
|
|
2142
|
|
|
2143 /*
|
|
|
2144 * round size up for alignment
|
|
|
2145 */
|
|
|
2146 size_align = (size + ALIGN_MASK) & ~ALIGN_MASK;
|
|
|
2147
|
|
|
2148 /*
|
|
|
2149 * If curbuf->b_m_search is NULL (uninitialized free list) start at
|
|
|
2150 * curbuf->b_block_head
|
|
|
2151 */
|
|
|
2152 if (curbuf->b_mb_current == NULL || curbuf->b_m_search == NULL)
|
|
|
2153 {
|
|
|
2154 curbuf->b_mb_current = &curbuf->b_block_head;
|
|
|
2155 curbuf->b_m_search = &(curbuf->b_block_head.mb_info);
|
|
|
2156 }
|
|
|
2157
|
|
|
2158 /* Search for a block with enough space. */
|
|
|
2159 mbp = curbuf->b_mb_current;
|
|
|
2160 while (mbp->mb_maxsize < size_align)
|
|
|
2161 {
|
|
|
2162 if (mbp->mb_next != NULL)
|
|
|
2163 mbp = mbp->mb_next;
|
|
|
2164 else
|
|
|
2165 mbp = &curbuf->b_block_head;
|
|
|
2166 if (mbp == curbuf->b_mb_current)
|
|
|
2167 {
|
|
|
2168 int n = (size_align > (MEMBLOCKSIZE / 4)
|
|
|
2169 ? size_align : MEMBLOCKSIZE);
|
|
|
2170
|
|
|
2171 /* Back where we started in block list: need to add a new block
|
|
|
2172 * with enough space. */
|
|
|
2173 mp = (minfo_T *)u_blockalloc((long_u)n);
|
|
|
2174 if (mp == NULL)
|
|
|
2175 return (NULL);
|
|
|
2176 mp->m_size = n;
|
|
|
2177 u_free_line((char_u *)mp + M_OFFSET, TRUE);
|
|
|
2178 mbp = curbuf->b_mb_current;
|
|
|
2179 break;
|
|
|
2180 }
|
|
|
2181 }
|
|
|
2182 if (mbp != curbuf->b_mb_current)
|
|
|
2183 curbuf->b_m_search = &(mbp->mb_info);
|
|
|
2184
|
|
|
2185 /* In this block find a chunk with enough space. */
|
|
|
2186 mprev = curbuf->b_m_search;
|
|
|
2187 mp = curbuf->b_m_search->m_next;
|
|
|
2188 for (;;)
|
|
|
2189 {
|
|
|
2190 if (mp == NULL) /* at end of the list */
|
|
|
2191 mp = &(mbp->mb_info); /* wrap around to begin */
|
|
|
2192 if (mp->m_size >= size)
|
|
|
2193 break;
|
|
|
2194 if (mp == curbuf->b_m_search)
|
|
|
2195 {
|
|
|
2196 /* back where we started in free chunk list: "cannot happen" */
|
|
|
2197 EMSG2(_(e_intern2), "u_alloc_line()");
|
|
|
2198 return NULL;
|
|
|
2199 }
|
|
|
2200 mprev = mp;
|
|
|
2201 mp = mp->m_next;
|
|
|
2202 }
|
|
|
2203
|
|
|
2204 /* when using the largest chunk adjust mb_maxsize */
|
|
|
2205 if (mp->m_size >= mbp->mb_maxsize)
|
|
|
2206 mbp->mb_maxsize = 0;
|
|
|
2207
|
|
|
2208 /* if the chunk we found is large enough, split it up in two */
|
|
|
2209 if ((long)mp->m_size - size_align >= (long)(sizeof(minfo_T) + 1))
|
|
|
2210 {
|
|
|
2211 mp2 = (minfo_T *)((char_u *)mp + size_align);
|
|
|
2212 mp2->m_size = mp->m_size - size_align;
|
|
|
2213 mp2->m_next = mp->m_next;
|
|
|
2214 mprev->m_next = mp2;
|
|
|
2215 mp->m_size = size_align;
|
|
|
2216 }
|
|
|
2217 else /* remove *mp from the free list */
|
|
|
2218 {
|
|
|
2219 mprev->m_next = mp->m_next;
|
|
|
2220 }
|
|
|
2221 curbuf->b_m_search = mprev;
|
|
|
2222 curbuf->b_mb_current = mbp;
|
|
|
2223
|
|
|
2224 /* If using the largest chunk need to find the new largest chunk */
|
|
|
2225 if (mbp->mb_maxsize == 0)
|
|
|
2226 for (mp2 = &(mbp->mb_info); mp2 != NULL; mp2 = mp2->m_next)
|
|
|
2227 if (mbp->mb_maxsize < mp2->m_size)
|
|
|
2228 mbp->mb_maxsize = mp2->m_size;
|
|
|
2229
|
|
|
2230 mp = (minfo_T *)((char_u *)mp + M_OFFSET);
|
|
|
2231 *(char_u *)mp = NUL; /* set the first byte to NUL */
|
|
|
2232
|
|
|
2233 return ((char_u *)mp);
|
|
|
2234 }
|
|
|
2235 #endif
|
|
|
2236
|
|
|
2237 /*
|
|
|
2238 * u_save_line(): allocate memory with u_alloc_line() and copy line 'lnum'
|
|
|
2239 * into it.
|
|
|
2240 */
|
|
|
2241 static char_u *
|
|
|
2242 u_save_line(lnum)
|
|
|
2243 linenr_T lnum;
|
|
|
2244 {
|
|
|
2245 char_u *src;
|
|
|
2246 char_u *dst;
|
|
|
2247 unsigned len;
|
|
|
2248
|
|
|
2249 src = ml_get(lnum);
|
|
|
2250 len = (unsigned)STRLEN(src);
|
|
|
2251 if ((dst = U_ALLOC_LINE(len)) != NULL)
|
|
|
2252 mch_memmove(dst, src, (size_t)(len + 1));
|
|
|
2253 return (dst);
|
|
|
2254 }
|
|
|
2255
|
|
|
2256 /*
|
|
|
2257 * Check if the 'modified' flag is set, or 'ff' has changed (only need to
|
|
|
2258 * check the first character, because it can only be "dos", "unix" or "mac").
|
|
|
2259 * "nofile" and "scratch" type buffers are considered to always be unchanged.
|
|
|
2260 */
|
|
|
2261 int
|
|
|
2262 bufIsChanged(buf)
|
|
|
2263 buf_T *buf;
|
|
|
2264 {
|
|
|
2265 return
|
|
|
2266 #ifdef FEAT_QUICKFIX
|
|
|
2267 !bt_dontwrite(buf) &&
|
|
|
2268 #endif
|
|
|
2269 (buf->b_changed || file_ff_differs(buf));
|
|
|
2270 }
|
|
|
2271
|
|
|
2272 int
|
|
|
2273 curbufIsChanged()
|
|
|
2274 {
|
|
|
2275 return
|
|
|
2276 #ifdef FEAT_QUICKFIX
|
|
|
2277 !bt_dontwrite(curbuf) &&
|
|
|
2278 #endif
|
|
|
2279 (curbuf->b_changed || file_ff_differs(curbuf));
|
|
|
2280 }
|
