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1 | /* |
2 | * Copyright (c) 1988 Mark Nudleman | |
3 | * Copyright (c) 1988 Regents of the University of California. | |
4 | * All rights reserved. | |
5 | * | |
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6 | * Redistribution and use in source and binary forms are permitted |
7 | * provided that the above copyright notice and this paragraph are | |
8 | * duplicated in all such forms and that any documentation, | |
9 | * advertising materials, and other materials related to such | |
10 | * distribution and use acknowledge that the software was developed | |
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11 | * by Mark Nudleman and the University of California, Berkeley. The |
12 | * name of Mark Nudleman or the | |
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13 | * University may not be used to endorse or promote products derived |
14 | * from this software without specific prior written permission. | |
15 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
16 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
17 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
18 | */ | |
19 | ||
20 | #ifndef lint | |
21 | char copyright[] = | |
22 | "@(#) Copyright (c) 1988 Mark Nudleman.\n\ | |
23 | @(#) Copyright (c) 1988 Regents of the University of California.\n\ | |
24 | All rights reserved.\n"; | |
25 | #endif /* not lint */ | |
26 | ||
27 | #ifndef lint | |
a942b40b | 28 | static char sccsid[] = "@(#)main.c 5.7 (Berkeley) %G%"; |
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29 | #endif /* not lint */ |
30 | ||
31 | /* | |
32 | * Entry point, initialization, miscellaneous routines. | |
33 | */ | |
34 | ||
35 | #include "less.h" | |
36 | #include "position.h" | |
37 | ||
38 | public int ispipe; | |
39 | public char * first_cmd; | |
40 | public char * every_first_cmd; | |
41 | public int new_file; | |
42 | public int is_tty; | |
43 | public char *current_file; | |
44 | public char *previous_file; | |
45 | public POSITION prev_pos; | |
46 | public int any_display; | |
47 | public int scroll; | |
48 | public int ac; | |
49 | public char ** av; | |
50 | public int curr_ac; | |
51 | public int quitting; | |
52 | ||
53 | extern int file; | |
54 | extern int quit_at_eof; | |
55 | extern int cbufs; | |
56 | extern int errmsgs; | |
57 | ||
bfe13c81 | 58 | public char * editor; |
bfe13c81 | 59 | |
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60 | extern char * tagfile; |
61 | extern char * tagpattern; | |
62 | extern int tagoption; | |
bfe13c81 | 63 | |
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64 | /* |
65 | * Edit a new file. | |
66 | * Filename "-" means standard input. | |
67 | * No filename means the "current" file, from the command line. | |
68 | */ | |
69 | public void | |
70 | edit(filename) | |
71 | register char *filename; | |
72 | { | |
73 | register int f; | |
74 | register char *m; | |
75 | POSITION initial_pos; | |
76 | char message[100]; | |
77 | static int didpipe; | |
78 | ||
79 | initial_pos = NULL_POSITION; | |
80 | if (filename == NULL || *filename == '\0') | |
81 | { | |
82 | if (curr_ac >= ac) | |
83 | { | |
84 | error("No current file"); | |
85 | return; | |
86 | } | |
87 | filename = save(av[curr_ac]); | |
88 | } else if (strcmp(filename, "#") == 0) | |
89 | { | |
90 | if (*previous_file == '\0') | |
91 | { | |
92 | error("no previous file"); | |
93 | return; | |
94 | } | |
95 | filename = save(previous_file); | |
96 | initial_pos = prev_pos; | |
97 | } else | |
98 | filename = save(filename); | |
99 | ||
100 | if (strcmp(filename, "-") == 0) | |
101 | { | |
102 | /* | |
103 | * Use standard input. | |
104 | */ | |
105 | if (didpipe) | |
106 | { | |
107 | error("Can view standard input only once"); | |
108 | return; | |
109 | } | |
110 | f = 0; | |
111 | } else if ((m = bad_file(filename, message, sizeof(message))) != NULL) | |
112 | { | |
113 | error(m); | |
114 | free(filename); | |
115 | return; | |
116 | } else if ((f = open(filename, 0)) < 0) | |
117 | { | |
118 | error(errno_message(filename, message, sizeof(message))); | |
119 | free(filename); | |
120 | return; | |
121 | } | |
122 | ||
123 | if (isatty(f)) | |
124 | { | |
125 | /* | |
126 | * Not really necessary to call this an error, | |
127 | * but if the control terminal (for commands) | |
128 | * and the input file (for data) are the same, | |
129 | * we get weird results at best. | |
130 | */ | |
131 | error("Can't take input from a terminal"); | |
132 | if (f > 0) | |
133 | close(f); | |
134 | free(filename); | |
135 | return; | |
136 | } | |
137 | ||
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138 | /* |
139 | * We are now committed to using the new file. | |
140 | * Close the current input file and set up to use the new one. | |
141 | */ | |
142 | if (file > 0) | |
143 | close(file); | |
144 | new_file = 1; | |
145 | if (previous_file != NULL) | |
146 | free(previous_file); | |
147 | previous_file = current_file; | |
148 | current_file = filename; | |
149 | prev_pos = position(TOP); | |
150 | ispipe = (f == 0); | |
151 | if (ispipe) | |
152 | didpipe = 1; | |
153 | file = f; | |
154 | ch_init(cbufs, 0); | |
155 | init_mark(); | |
156 | ||
157 | if (every_first_cmd != NULL) | |
158 | first_cmd = every_first_cmd; | |
159 | ||
160 | if (is_tty) | |
161 | { | |
162 | int no_display = !any_display; | |
163 | any_display = 1; | |
164 | if (no_display && errmsgs > 0) | |
165 | { | |
166 | /* | |
167 | * We displayed some messages on error output | |
168 | * (file descriptor 2; see error() function). | |
169 | * Before erasing the screen contents, | |
170 | * display the file name and wait for a keystroke. | |
171 | */ | |
172 | error(filename); | |
173 | } | |
174 | /* | |
175 | * Indicate there is nothing displayed yet. | |
176 | */ | |
177 | pos_clear(); | |
178 | if (initial_pos != NULL_POSITION) | |
179 | jump_loc(initial_pos); | |
180 | clr_linenum(); | |
181 | } | |
182 | } | |
183 | ||
184 | /* | |
185 | * Edit the next file in the command line list. | |
186 | */ | |
187 | public void | |
188 | next_file(n) | |
189 | int n; | |
190 | { | |
191 | if (curr_ac + n >= ac) | |
192 | { | |
193 | if (quit_at_eof) | |
194 | quit(); | |
195 | error("No (N-th) next file"); | |
196 | } else | |
197 | edit(av[curr_ac += n]); | |
198 | } | |
199 | ||
200 | /* | |
201 | * Edit the previous file in the command line list. | |
202 | */ | |
203 | public void | |
204 | prev_file(n) | |
205 | int n; | |
206 | { | |
207 | if (curr_ac - n < 0) | |
208 | error("No (N-th) previous file"); | |
209 | else | |
210 | edit(av[curr_ac -= n]); | |
211 | } | |
212 | ||
213 | /* | |
214 | * Copy a file directly to standard output. | |
215 | * Used if standard output is not a tty. | |
216 | */ | |
217 | static void | |
218 | cat_file() | |
219 | { | |
220 | register int c; | |
221 | ||
222 | while ((c = ch_forw_get()) != EOI) | |
223 | putchr(c); | |
224 | flush(); | |
225 | } | |
226 | ||
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227 | /* |
228 | * Entry point. | |
229 | */ | |
230 | main(argc, argv) | |
231 | int argc; | |
232 | char *argv[]; | |
233 | { | |
234 | char *getenv(); | |
235 | ||
236 | ||
237 | /* | |
238 | * Process command line arguments and LESS environment arguments. | |
239 | * Command line arguments override environment arguments. | |
240 | */ | |
241 | init_prompt(); | |
242 | init_option(); | |
243 | scan_option(getenv("LESS")); | |
244 | argv++; | |
245 | while ( (--argc > 0) && | |
246 | (argv[0][0] == '-' || argv[0][0] == '+') && | |
247 | argv[0][1] != '\0') | |
248 | scan_option(*argv++); | |
249 | ||
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250 | editor = getenv("EDITOR"); |
251 | if (editor == NULL || *editor == '\0') | |
252 | editor = EDIT_PGM; | |
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253 | |
254 | /* | |
255 | * Set up list of files to be examined. | |
256 | */ | |
257 | ac = argc; | |
258 | av = argv; | |
259 | curr_ac = 0; | |
260 | ||
261 | /* | |
262 | * Set up terminal, etc. | |
263 | */ | |
264 | is_tty = isatty(1); | |
265 | if (!is_tty) | |
266 | { | |
267 | /* | |
268 | * Output is not a tty. | |
269 | * Just copy the input file(s) to output. | |
270 | */ | |
271 | if (ac < 1) | |
272 | { | |
273 | edit("-"); | |
274 | cat_file(); | |
275 | } else | |
276 | { | |
277 | do | |
278 | { | |
279 | edit((char *)NULL); | |
280 | if (file >= 0) | |
281 | cat_file(); | |
282 | } while (++curr_ac < ac); | |
283 | } | |
284 | exit(0); | |
285 | } | |
286 | ||
287 | raw_mode(1); | |
288 | get_term(); | |
289 | open_getchr(); | |
290 | init(); | |
291 | init_cmd(); | |
292 | ||
293 | init_signals(1); | |
294 | ||
295 | /* | |
296 | * Select the first file to examine. | |
297 | */ | |
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298 | if (tagoption) |
299 | { | |
300 | /* | |
301 | * A -t option was given. | |
302 | * Verify that no filenames were also given. | |
303 | * Edit the file selected by the "tags" search, | |
304 | * and search for the proper line in the file. | |
305 | */ | |
306 | if (ac > 0) | |
307 | { | |
308 | error("No filenames allowed with -t option"); | |
309 | quit(); | |
310 | } | |
311 | if (tagfile == NULL) | |
312 | quit(); | |
313 | edit(tagfile); | |
314 | if (file < 0) | |
315 | quit(); | |
316 | if (tagsearch()) | |
317 | quit(); | |
318 | } else | |
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319 | if (ac < 1) |
320 | edit("-"); /* Standard input */ | |
321 | else | |
322 | { | |
323 | /* | |
324 | * Try all the files named as command arguments. | |
325 | * We are simply looking for one which can be | |
326 | * opened without error. | |
327 | */ | |
328 | do | |
329 | { | |
330 | edit((char *)NULL); | |
331 | } while (file < 0 && ++curr_ac < ac); | |
332 | } | |
333 | ||
334 | if (file >= 0) | |
335 | commands(); | |
336 | quit(); | |
337 | /*NOTREACHED*/ | |
338 | } | |
339 | ||
340 | /* | |
341 | * Copy a string, truncating to the specified length if necessary. | |
342 | * Unlike strncpy(), the resulting string is guaranteed to be null-terminated. | |
343 | */ | |
344 | public void | |
345 | strtcpy(to, from, len) | |
346 | char *to; | |
347 | char *from; | |
348 | unsigned int len; | |
349 | { | |
350 | strncpy(to, from, len); | |
351 | to[len-1] = '\0'; | |
352 | } | |
353 | ||
354 | /* | |
355 | * Copy a string to a "safe" place | |
c48c82c8 | 356 | * (that is, to a buffer allocated by malloc). |
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357 | */ |
358 | public char * | |
359 | save(s) | |
360 | char *s; | |
361 | { | |
c48c82c8 | 362 | char *p, *strcpy(), *malloc(); |
bfe13c81 | 363 | |
c48c82c8 | 364 | p = malloc((u_int)strlen(s)+1); |
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365 | if (p == NULL) |
366 | { | |
367 | error("cannot allocate memory"); | |
368 | quit(); | |
369 | } | |
c48c82c8 | 370 | return(strcpy(p, s)); |
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371 | } |
372 | ||
373 | /* | |
374 | * Exit the program. | |
375 | */ | |
376 | public void | |
377 | quit() | |
378 | { | |
379 | /* | |
380 | * Put cursor at bottom left corner, clear the line, | |
381 | * reset the terminal modes, and exit. | |
382 | */ | |
383 | quitting = 1; | |
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384 | lower_left(); |
385 | clear_eol(); | |
386 | deinit(); | |
387 | flush(); | |
388 | raw_mode(0); | |
389 | exit(0); | |
390 | } |