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1 ************************************************************
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2 * More - Prompts lists a file or files one screen at a time.
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3 * If no files are specified, STDIN is used.
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4 *
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5 * At the --More-- prompt, press:
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6 * <ENTER> to go advance one line
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7 * <BREAK> or 'Q' to quit
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8 * <SPACE> or any other key to advance one screenful
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9 *
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10 * Usage: More [-l -w] [file] [...]
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11 * -l = show the name of the file before viewing
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12 * (handy for multiple files)
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13 * -w = don't allow lines to wrap around. This option truncates
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14 * the line to a length of window's X size - 1.
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15 *
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16 * If you are using a terminal other than the OS-9 Level II
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17 * windowing system, you will need to change the reverse
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18 * on/off sequence as well as the clear line sequence
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19 *
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20 * NOTE: More works great with Shell+'s wildcards! It also works
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21 * well with external terminals. Just change the Reverse
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22 * on/off and DelLine bytes to match your terminal's codes.
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23 * If you are running 'more' on a terminal, it assumes an 80x24
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24 * terminal screen size.
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25 *
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26 * By: Boisy G. Pitre
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27 * 1204 Love Street
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28 * Brookhaven, MS 39601
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29 * Internet: bgpitre@seabass.st.usm.edu
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30 *
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31
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32 ifp1
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33 use defsfile
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34 endc
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35
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36 * Terminal specific equates:
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37 XSIZE equ 80
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38 YSIZE equ 24
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39 DELNE equ $3
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40 REVON equ $1f20
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41 REVOFF equ $1f21
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42
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43 mod Size,Name,Prgrm+Objct,Reent+1,Start,Fin
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44 Name fcs /M/
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45 Ed fcb 2
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46
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47 Path rmb 1
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48 Response rmb 1
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49 XH rmb 1
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50 XL rmb 1
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51 YH rmb 1
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52 YL rmb 1
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53 Lflag rmb 1
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54 FilePtr rmb 2
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55 Buffer rmb 250
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56 FileBuf rmb 60
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57 Stack rmb 200
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58
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59 * I make the Parms buffer large in case the wildcard expansion is long,
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60 * else the system crashes. You can alternately use the shell's memory
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61 * modifier (i.e. #4k) to insure a big buffer.
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62 Parms rmb 4096
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63
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64 Fin equ .
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65
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66 Message fdb REVON Reverse Video on
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67 fcc /--More--/
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68 fdb REVOFF Reverse Video off
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69 MessLen equ *-Message
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70
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71 Header fdb $0a0d
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72 fcc /****** File: /
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73 HeadLen equ *-Header
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74
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75
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76 DelLine fcb DELNE Delete line char
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77 CR fcb $0d Carriage Return
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78
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79 ****** SUBROUTINES
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80 PutHead pshs x Here, we actually print the header
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81 leax Header,pcr for the file we are working on.
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82 ldy #HeadLen
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83 lda #1
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84 os9 I$Write
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85 lbcs Error
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86 puls x
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87 bsr SaveFile
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88 lda #1
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89 leax FileBuf,u
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90 ldy #60
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91 os9 I$WritLn
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92 lbcs Error
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93 rts
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94
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95 SaveFile pshs x
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96 leay FileBuf,u
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97 SaveF2 lda ,x+
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98 cmpa #$20
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99 bne SaveF3
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100 lda #$0d
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101 SaveF3 sta ,y+
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102 cmpa #$0d
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103 bne SaveF2
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104 puls x
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105 rts
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106
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107 GetSize pshs x
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108 lda #1 Using stdout...
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109 ldb #$26
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110 os9 I$GetStt Find the X and Y size of window
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111 bcs ChekErr
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112 stx XH Save the X value
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113 sty YH Save the Y value
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114 clr XH Clear high-order byte of X
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115 dec XL Decrement the X value
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116 dec YL Decrement the Y value
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117 dec YL and dec Y again
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118 puls x
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119 lda YL Do the initial load of the counter
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120 sta YH
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121 rts
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122
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123 ChekErr cmpb #E$UnkSvc If this is true, then we are probably
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124 bne Error dealing with a terminal, not a hardware
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125 lda #XSIZE window. We'll assume 80x24 as the
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126 sta XL terminal size.
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127 lda #YSIZE
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128 sta YL
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129 clr XH
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130 rts
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131
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132 ********* PROGRAM ENTRY
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133 Start pshs x put away X temporarily,
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134 leax IntSvc,pc point to the interrupt service routine
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135 os9 F$Icpt and make the system aware of it
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136 puls x then get X back for processing
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137 clr Path Clear the path (assume stdin)
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138 clr LFlag
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139 bsr GetSize
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140
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141 Parse lda ,x+ Parsing of the line is done here
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142 cmpa #$20
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143 beq Parse
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144 cmpa #'-
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145 beq GetOpt
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146 cmpa #$0d
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147 bne TestFlag
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148 tst Path
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149 beq Cycle
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150 bra Done
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151
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152 GetOpt lda ,x+
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153 cmpa #$20
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154 beq Parse
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155 anda #$df
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156 cmpa #'L
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157 bne IsitW
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158 com LFlag
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159 bra Parse
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160 IsItW cmpa #'W
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161 bne Done
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162 lda XL
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163 deca
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164 sta XH
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165 bra Parse
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166
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167 TestFlag leax -1,x Here, we test to see if the -l
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168 tst LFlag flag is set (to display the file
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169 bne TestF2 header) If so, we print it, else
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170 bsr OpenFile
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171 bra ReadLine
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172 TestF2 pshs x we continue with reading...
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173 lbsr PutHead
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174 puls x
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175 bsr OpenFile
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176 dec YH Decrement counter twice to take into
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177 dec YH account the header (two lines)
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178 lda YH See if the count is less than 1
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179 cmpa #1
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180 blt ShowMess if so, time to show prompt
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181 bra ReadLine else read the line
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182
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183 OpenFile lda #Read. Prepare for reading
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184 os9 I$Open Then open the file
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185 bcs Error Exit on error
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186 stx FilePtr Save X for later use
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187 sta Path ...else save the path
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188 rts
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189
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190 Done clrb
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191 Error os9 F$Exit
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192
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193
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194 Cycle lda YL Get the low order byte
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195 sta YH and use the high as a counter
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196 bsr PutCR
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197
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198 ReadLine lda Path Get the path
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199 ldy #250 max chars read = 250
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200 leax Buffer,u point to the buffer
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201 os9 I$ReadLn and read the line
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202 bcs EOF if error, check for EOF
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203 tst XH Is high order byte set?
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204 beq WriteOut Nope, continue as normal
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205 pshs x else loop until end of the
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206 ldb XH string and place a CR at the
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207 Loop leax 1,x end.
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208 decb This is unnecessary if the line
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209 bne Loop is less than XH, but doesn't slow
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210 lda #$0d down the processing considerably
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211 sta ,x and would take longer if we actually
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212 puls x checked to see if a CR existed.
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213
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214 WriteOut lda #1 Prepare to write to stdout
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215 os9 I$WritLn Write!
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216 bcs Error if error, leave
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217 dec YH else decrement the counter
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218 bne ReadLine if not 0, more lines to show
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219
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220 ShowMess leax Message,pc Prepare to show message
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221 ldy #MessLen
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222 lda #2 to stderr...
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223 os9 I$Write write it!
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224 bcs Error
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225 lda #2 Now get response
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226 ldy #1 of one character
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227 leax Response,u from stderr
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228 os9 I$Read
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229 bcs Error
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230 bsr KillLine
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231 bra TestInp
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232
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233 PutCR leax CR,pc
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234 lda #1
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235 ldy #1
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236 os9 I$Write
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237 bcs Error
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238 rts
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239
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240 KillLine lda #2 Here we send a delete line char
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241 ldy #1 to clean the prompt.
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242 leax DelLine,pc
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243 os9 I$Write
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244 bcs Error
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245 rts
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246
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247 EOF cmpb #E$EOF Check for end-of-file
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248 bne Error If not, exit w/ error
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249 EOF2 lda Path else close the path
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250 os9 I$Close
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251 tst Path If the path is stdin, we can quit
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252 lbeq Done
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253 ldx FilePtr
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254 lbra Parse command line.
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255
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256 TestInp lda Response Here we test the response at prompt
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257 cmpa #$0d is it cr?
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258 beq OneLine yep, go up one line
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259 anda #$df else mask uppercase
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260 cmpa #'Q is it Q?
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261 beq IntSvc Yep, kill prompt and exit
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262 cmpa #'N is it N?
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263 lbne Cycle nope, must be space or other char
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264 bsr KillLine else Kill the prompt
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265 bra EOF2 and get next file
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266
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267 IntSvc bsr KillLine Interrupt service routine
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268 lbra Done
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269
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270 OneLine lda #1 We go here if <ENTER> was pressed
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271 sta YH,u to increment only one line
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272 lbra ReadLine
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273
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274 emod
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275 Size equ *
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276 end
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