1 /* $FreeBSD$ */
2 /*
3 * Copyright (C) 1984-2015 Mark Nudelman
4 *
5 * You may distribute under the terms of either the GNU General Public
6 * License or the Less License, as specified in the README file.
7 *
8 * For more information, see the README file.
9 */
10
11
12 /*
13 * Entry point, initialization, miscellaneous routines.
14 */
15
16 #include "less.h"
17 #if MSDOS_COMPILER==WIN32C
18 #include <windows.h>
19 #endif
20
21 public char * every_first_cmd = NULL;
22 public int new_file;
23 public int is_tty;
24 public IFILE curr_ifile = NULL_IFILE;
25 public IFILE old_ifile = NULL_IFILE;
26 public struct scrpos initial_scrpos;
27 public int any_display = FALSE;
28 public POSITION start_attnpos = NULL_POSITION;
29 public POSITION end_attnpos = NULL_POSITION;
30 public int wscroll;
31 public char * progname;
32 public int quitting;
33 public int secure;
34 public int dohelp;
35
36 #if LOGFILE
37 public int logfile = -1;
38 public int force_logfile = FALSE;
39 public char * namelogfile = NULL;
40 #endif
41
42 #if EDITOR
43 public char * editor;
44 public char * editproto;
45 #endif
46
47 #if TAGS
48 extern char * tags;
49 extern char * tagoption;
50 extern int jump_sline;
51 #endif
52
53 #ifdef WIN32
54 static char consoleTitle[256];
55 #endif
56
57 extern int less_is_more;
58 extern int missing_cap;
59 extern int know_dumb;
60 extern int no_init;
61 extern int pr_type;
62
63
64 /*
65 * Entry point.
66 */
67 int
main(argc,argv)68 main(argc, argv)
69 int argc;
70 char *argv[];
71 {
72 IFILE ifile;
73 char *s;
74 extern char *__progname;
75
76 #ifdef __EMX__
77 _response(&argc, &argv);
78 _wildcard(&argc, &argv);
79 #endif
80
81 progname = *argv++;
82 argc--;
83
84 secure = 0;
85 s = lgetenv("LESSSECURE");
86 if (s != NULL && *s != '\0')
87 secure = 1;
88
89 #ifdef WIN32
90 if (getenv("HOME") == NULL)
91 {
92 /*
93 * If there is no HOME environment variable,
94 * try the concatenation of HOMEDRIVE + HOMEPATH.
95 */
96 char *drive = getenv("HOMEDRIVE");
97 char *path = getenv("HOMEPATH");
98 if (drive != NULL && path != NULL)
99 {
100 char *env = (char *) ecalloc(strlen(drive) +
101 strlen(path) + 6, sizeof(char));
102 strcpy(env, "HOME=");
103 strcat(env, drive);
104 strcat(env, path);
105 putenv(env);
106 }
107 }
108 GetConsoleTitle(consoleTitle, sizeof(consoleTitle)/sizeof(char));
109 #endif /* WIN32 */
110
111 /*
112 * Process command line arguments and LESS environment arguments.
113 * Command line arguments override environment arguments.
114 */
115 is_tty = isatty(1);
116 get_term();
117 init_cmds();
118 init_charset();
119 init_line();
120 init_cmdhist();
121 init_option();
122 init_search();
123
124 /*
125 * If the name of the executable program is "more",
126 * act like LESS_IS_MORE is set.
127 */
128 for (s = progname + strlen(progname); s > progname; s--)
129 {
130 if (s[-1] == PATHNAME_SEP[0])
131 break;
132 }
133 if (strcmp(s, "more") == 0)
134 less_is_more = 1;
135
136 init_prompt();
137
138 if (less_is_more)
139 scan_option("-fG");
140
141 s = lgetenv(less_is_more ? "MORE" : "LESS");
142 if (s != NULL)
143 scan_option(save(s));
144
145 #define isoptstring(s) less_is_more ? (((s)[0] == '-') && (s)[1] != '\0') : \
146 (((s)[0] == '-' || (s)[0] == '+') && (s)[1] != '\0')
147 while (argc > 0 && (isoptstring(*argv) || isoptpending()))
148 {
149 s = *argv++;
150 argc--;
151 if (strcmp(s, "--") == 0)
152 break;
153 scan_option(s);
154 }
155 #undef isoptstring
156
157 if (isoptpending())
158 {
159 /*
160 * Last command line option was a flag requiring a
161 * following string, but there was no following string.
162 */
163 nopendopt();
164 quit(QUIT_OK);
165 }
166
167 if (less_is_more)
168 no_init = TRUE;
169
170 #if EDITOR
171 editor = lgetenv("VISUAL");
172 if (editor == NULL || *editor == '\0')
173 {
174 editor = lgetenv("EDITOR");
175 if (editor == NULL || *editor == '\0')
176 editor = EDIT_PGM;
177 }
178 editproto = lgetenv("LESSEDIT");
179 if (editproto == NULL || *editproto == '\0')
180 editproto = "%E ?lm+%lm. %f";
181 #endif
182
183 /*
184 * Call get_ifile with all the command line filenames
185 * to "register" them with the ifile system.
186 */
187 ifile = NULL_IFILE;
188 if (dohelp)
189 ifile = get_ifile(FAKE_HELPFILE, ifile);
190 while (argc-- > 0)
191 {
192 char *filename;
193 #if (MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC)
194 /*
195 * Because the "shell" doesn't expand filename patterns,
196 * treat each argument as a filename pattern rather than
197 * a single filename.
198 * Expand the pattern and iterate over the expanded list.
199 */
200 struct textlist tlist;
201 char *gfilename;
202
203 gfilename = lglob(*argv++);
204 init_textlist(&tlist, gfilename);
205 filename = NULL;
206 while ((filename = forw_textlist(&tlist, filename)) != NULL)
207 {
208 (void) get_ifile(filename, ifile);
209 ifile = prev_ifile(NULL_IFILE);
210 }
211 free(gfilename);
212 #else
213 filename = shell_quote(*argv);
214 if (filename == NULL)
215 filename = *argv;
216 argv++;
217 (void) get_ifile(filename, ifile);
218 ifile = prev_ifile(NULL_IFILE);
219 free(filename);
220 #endif
221 }
222 /*
223 * Set up terminal, etc.
224 */
225 if (!is_tty)
226 {
227 /*
228 * Output is not a tty.
229 * Just copy the input file(s) to output.
230 */
231 SET_BINARY(1);
232 if (nifile() == 0)
233 {
234 if (edit_stdin() == 0)
235 cat_file();
236 } else if (edit_first() == 0)
237 {
238 do {
239 cat_file();
240 } while (edit_next(1) == 0);
241 }
242 quit(QUIT_OK);
243 }
244
245 if (missing_cap && !know_dumb && !less_is_more)
246 error("WARNING: terminal is not fully functional", NULL_PARG);
247 init_mark();
248 open_getchr();
249 raw_mode(1);
250 init_signals(1);
251
252 /*
253 * Select the first file to examine.
254 */
255 #if TAGS
256 if (tagoption != NULL || strcmp(tags, "-") == 0)
257 {
258 /*
259 * A -t option was given.
260 * Verify that no filenames were also given.
261 * Edit the file selected by the "tags" search,
262 * and search for the proper line in the file.
263 */
264 if (nifile() > 0)
265 {
266 error("No filenames allowed with -t option", NULL_PARG);
267 quit(QUIT_ERROR);
268 }
269 findtag(tagoption);
270 if (edit_tagfile()) /* Edit file which contains the tag */
271 quit(QUIT_ERROR);
272 /*
273 * Search for the line which contains the tag.
274 * Set up initial_scrpos so we display that line.
275 */
276 initial_scrpos.pos = tagsearch();
277 if (initial_scrpos.pos == NULL_POSITION)
278 quit(QUIT_ERROR);
279 initial_scrpos.ln = jump_sline;
280 } else
281 #endif
282 if (nifile() == 0)
283 {
284 if (edit_stdin()) /* Edit standard input */
285 quit(QUIT_ERROR);
286 } else
287 {
288 if (edit_first()) /* Edit first valid file in cmd line */
289 quit(QUIT_ERROR);
290 }
291
292 init();
293 commands();
294 quit(QUIT_OK);
295 /*NOTREACHED*/
296 return (0);
297 }
298
299 /*
300 * Copy a string to a "safe" place
301 * (that is, to a buffer allocated by calloc).
302 */
303 public char *
save(s)304 save(s)
305 char *s;
306 {
307 register char *p;
308
309 p = (char *) ecalloc(strlen(s)+1, sizeof(char));
310 strcpy(p, s);
311 return (p);
312 }
313
314 /*
315 * Allocate memory.
316 * Like calloc(), but never returns an error (NULL).
317 */
318 public VOID_POINTER
ecalloc(count,size)319 ecalloc(count, size)
320 int count;
321 unsigned int size;
322 {
323 register VOID_POINTER p;
324
325 p = (VOID_POINTER) calloc(count, size);
326 if (p != NULL)
327 return (p);
328 error("Cannot allocate memory", NULL_PARG);
329 quit(QUIT_ERROR);
330 /*NOTREACHED*/
331 return (NULL);
332 }
333
334 /*
335 * Skip leading spaces in a string.
336 */
337 public char *
skipsp(s)338 skipsp(s)
339 register char *s;
340 {
341 while (*s == ' ' || *s == '\t')
342 s++;
343 return (s);
344 }
345
346 /*
347 * See how many characters of two strings are identical.
348 * If uppercase is true, the first string must begin with an uppercase
349 * character; the remainder of the first string may be either case.
350 */
351 public int
sprefix(ps,s,uppercase)352 sprefix(ps, s, uppercase)
353 char *ps;
354 char *s;
355 int uppercase;
356 {
357 register int c;
358 register int sc;
359 register int len = 0;
360
361 for ( ; *s != '\0'; s++, ps++)
362 {
363 c = *ps;
364 if (uppercase)
365 {
366 if (len == 0 && ASCII_IS_LOWER(c))
367 return (-1);
368 if (ASCII_IS_UPPER(c))
369 c = ASCII_TO_LOWER(c);
370 }
371 sc = *s;
372 if (len > 0 && ASCII_IS_UPPER(sc))
373 sc = ASCII_TO_LOWER(sc);
374 if (c != sc)
375 break;
376 len++;
377 }
378 return (len);
379 }
380
381 /*
382 * Exit the program.
383 */
384 public void
quit(status)385 quit(status)
386 int status;
387 {
388 static int save_status;
389
390 /*
391 * Put cursor at bottom left corner, clear the line,
392 * reset the terminal modes, and exit.
393 */
394 if (status < 0)
395 status = save_status;
396 else
397 save_status = status;
398 quitting = 1;
399 edit((char*)NULL);
400 save_cmdhist();
401 if (any_display && is_tty)
402 clear_bot();
403 deinit();
404 flush();
405 raw_mode(0);
406 #if MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC
407 /*
408 * If we don't close 2, we get some garbage from
409 * 2's buffer when it flushes automatically.
410 * I cannot track this one down RB
411 * The same bug shows up if we use ^C^C to abort.
412 */
413 close(2);
414 #endif
415 #ifdef WIN32
416 SetConsoleTitle(consoleTitle);
417 #endif
418 close_getchr();
419 exit(status);
420 }
421