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1 /*
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2 * This file is the general header file for all parts of the MicroEMACS
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3 * display editor. It contains definitions used by everyone, and it contains
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4 * the stuff you have to edit to create a version of the editor for a specific
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5 * operating system and terminal.
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6 */
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7
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8 /* #define AMIGA 1 /* AmigaDOS, Lattice */
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9 /* #define ST520 0 /* ST520, TOS */
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10 /* #define MWC86 0
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11 /* #define V7 0 /* V7 UN*X or Coherent */
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12 /* #define VMS 0 /* VAX/VMS */
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13 /* #define CPM 0 /* CP/M-86 */
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1869
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14 /* #define OS9 1 /* os9/6809 level 1 (coco) */
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995
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15 /* #define OSK 1 /* os9/68000 predefined */
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16 /* #define MSDOS 0 /* MS-DOS predefined */
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17
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18 /* #define ANSI 1 /* ANSI terminal (Vt100) */
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19 /* #define VT52 1 /* VT52 terminal (Zenith). */
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20 /* #define VT100 0 /* Handle VT100 style keypad. */
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21 /* #define LK201 0 /* Handle LK201 style keypad. */
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22 /* #define RAINBOW 0 /* Use Rainbow fast video. */
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23 /* #define TERMCAP 0 /* Use TERMCAP */
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24
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25 #define CVMVAS 1 /* C-V, M-V arg. in screens. */
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26
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27 #define NFILEN 80 /* # of bytes, file name */
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28 #define NBUFN 16 /* # of bytes, buffer name */
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29 #define NLINE 256 /* # of bytes, line */
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30 #define NKBDM 256 /* # of strokes, keyboard macro */
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31 #define NPAT 80 /* # of bytes, pattern */
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32 #define HUGE 1000 /* Huge number */
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33
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34 #define AGRAVE 0x60 /* M- prefix, Grave (LK201) */
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35 #define METACH 0x1B /* M- prefix, Control-[, ESC */
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36 #define CTMECH 0x1C /* C-M- prefix, Control-\ */
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37 #define EXITCH 0x1D /* Exit level, Control-] */
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38 #define CTRLCH 0x1E /* C- prefix, Control-^ */
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39 #define HELPCH 0x1F /* Help key, Control-_ */
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40
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41 #define CTRL 0x0100 /* Control flag, or'ed in */
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42 #define META 0x0200 /* Meta flag, or'ed in */
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43 #define CTLX 0x0400 /* ^X flag, or'ed in */
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44
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45 #define FALSE 0 /* False, no, bad, etc. */
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46 #define TRUE 1 /* True, yes, good, etc. */
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47 #define ABORT 2 /* Death, ^G, abort, etc. */
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48
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49 #define FIOSUC 0 /* File I/O, success. */
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50 #define FIOFNF 1 /* File I/O, file not found. */
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51 #define FIOEOF 2 /* File I/O, end of file. */
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52 #define FIOERR 3 /* File I/O, error. */
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53
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54 #define CFCPCN 0x0001 /* Last command was C-P, C-N */
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55 #define CFKILL 0x0002 /* Last command was a kill */
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56
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57 /*
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58 * There is a window structure allocated for every active display window. The
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59 * windows are kept in a big list, in top to bottom screen order, with the
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60 * listhead at "wheadp". Each window contains its own values of dot and mark.
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61 * The flag field contains some bits that are set by commands to guide
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62 * redisplay; although this is a bit of a compromise in terms of decoupling,
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63 * the full blown redisplay is just too expensive to run for every input
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64 * character.
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65 */
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66 typedef struct WINDOW {
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67 struct WINDOW *w_wndp; /* Next window */
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68 struct BUFFER *w_bufp; /* Buffer displayed in window */
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69 struct LINE *w_linep; /* Top line in the window */
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70 struct LINE *w_dotp; /* Line containing "." */
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71 short w_doto; /* Byte offset for "." */
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72 struct LINE *w_markp; /* Line containing "mark" */
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73 short w_marko; /* Byte offset for "mark" */
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74 char w_toprow; /* Origin 0 top row of window */
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75 char w_ntrows; /* # of rows of text in window */
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76 char w_force; /* If NZ, forcing row. */
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77 char w_flag; /* Flags. */
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78 } WINDOW;
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79
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80 #define WFFORCE 0x01 /* Window needs forced reframe */
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81 #define WFMOVE 0x02 /* Movement from line to line */
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82 #define WFEDIT 0x04 /* Editing within a line */
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83 #define WFHARD 0x08 /* Better to a full display */
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84 #define WFMODE 0x10 /* Update mode line. */
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85
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86 /*
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87 * Text is kept in buffers. A buffer header, described below, exists for every
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88 * buffer in the system. The buffers are kept in a big list, so that commands
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89 * that search for a buffer by name can find the buffer header. There is a
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90 * safe store for the dot and mark in the header, but this is only valid if
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91 * the buffer is not being displayed (that is, if "b_nwnd" is 0). The text for
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92 * the buffer is kept in a circularly linked list of lines, with a pointer to
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93 * the header line in "b_linep".
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94 */
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95 typedef struct BUFFER {
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96 struct BUFFER *b_bufp; /* Link to next BUFFER */
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97 struct LINE *b_dotp; /* Link to "." LINE structure */
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98 short b_doto; /* Offset of "." in above LINE */
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99 struct LINE *b_markp; /* The same as the above two, */
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100 short b_marko; /* but for the "mark" */
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101 struct LINE *b_linep; /* Link to the header LINE */
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102 char b_nwnd; /* Count of windows on buffer */
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103 char b_flag; /* Flags */
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104 char b_fname[NFILEN]; /* File name */
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105 char b_bname[NBUFN]; /* Buffer name */
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106 } BUFFER;
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107
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108 #define BFTEMP 0x01 /* Internal temporary buffer */
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109 #define BFCHG 0x02 /* Changed since last write */
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110
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111 /*
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112 * The starting position of a region, and the size of the region in
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113 * characters, is kept in a region structure. Used by the region commands.
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114 */
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115 typedef struct {
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116 struct LINE *r_linep; /* Origin LINE address. */
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117 short r_offset; /* Origin LINE offset. */
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118 short r_size; /* Length in characters. */
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119 } REGION;
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120
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121 /*
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122 * All text is kept in circularly linked lists of "LINE" structures. These
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123 * begin at the header line (which is the blank line beyond the end of the
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124 * buffer). This line is pointed to by the "BUFFER". Each line contains a the
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125 * number of bytes in the line (the "used" size), the size of the text array,
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126 * and the text. The end of line is not stored as a byte; it's implied. Future
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127 * additions will include update hints, and a list of marks into the line.
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128 */
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129 typedef struct LINE {
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130 struct LINE *l_fp; /* Link to the next line */
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131 struct LINE *l_bp; /* Link to the previous line */
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132 short l_size; /* Allocated size */
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133 short l_used; /* Used size */
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134 char l_text[1]; /* A bunch of characters. */
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135 } LINE;
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136
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137 #define lforw(lp) ((lp)->l_fp)
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138 #define lback(lp) ((lp)->l_bp)
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139 #define lgetc(lp, n) ((lp)->l_text[(n)]&0xFF)
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140 #define lputc(lp, n, c) ((lp)->l_text[(n)]=(c))
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141 #define llength(lp) ((lp)->l_used)
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142
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143 /*
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144 * The editor communicates with the display using a high level interface. A
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145 * "TERM" structure holds useful variables, and indirect pointers to routines
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146 * that do useful operations. The low level get and put routines are here too.
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147 * This lets a terminal, in addition to having non standard commands, have
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148 * funny get and put character code too. The calls might get changed to
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149 * "termp->t_field" style in the future, to make it possible to run more than
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150 * one terminal type.
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151 */
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152 typedef struct {
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153 short t_nrow; /* Number of rows. */
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154 short t_ncol; /* Number of columns. */
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155 int (*t_open)(); /* Open terminal at the start. */
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156 int (*t_close)(); /* Close terminal at end. */
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157 int (*t_getchar)(); /* Get character from keyboard. */
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158 int (*t_putchar)(); /* Put character to display. */
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159 int (*t_flush)(); /* Flush output buffers. */
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160 int (*t_move)(); /* Move the cursor, origin 0. */
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161 int (*t_eeol)(); /* Erase to end of line. */
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162 int (*t_eeop)(); /* Erase to end of page. */
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163 int (*t_beep)(); /* Beep. */
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164 } TERM;
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165
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166 extern int fillcol; /* Fill column */
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167 extern int currow; /* Cursor row */
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168 extern int curcol; /* Cursor column */
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169 extern int thisflag; /* Flags, this command */
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170 extern int lastflag; /* Flags, last command */
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171 extern int curgoal; /* Goal for C-P, C-N */
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172 extern int mpresf; /* Stuff in message line */
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173 extern int sgarbf; /* State of screen unknown */
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174 extern WINDOW *curwp; /* Current window */
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175 extern BUFFER *curbp; /* Current buffer */
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176 extern WINDOW *wheadp; /* Head of list of windows */
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177 extern BUFFER *bheadp; /* Head of list of buffers */
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178 extern BUFFER *blistp; /* Buffer for C-X C-B */
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179 extern short kbdm[]; /* Holds kayboard macro data */
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180 extern short *kbdmip; /* Input pointer for above */
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181 extern short *kbdmop; /* Output pointer for above */
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182 extern char pat[]; /* Search pattern */
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183 extern TERM term; /*(Terminal information. */
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184
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185 extern BUFFER *bfind(); /* Lookup a buffer by name */
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186 extern WINDOW *wpopup(); /* Pop up window creation */
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187 extern LINE *lalloc(); /* Allocate a line */
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188
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189
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