1 /*
2 * Copyright (C) 1984-2002 Mark Nudelman
3 *
4 * You may distribute under the terms of either the GNU General Public
5 * License or the Less License, as specified in the README file.
6 *
7 * For more information about less, or for information on how to
8 * contact the author, see the README file.
9 */
10 /*
11 * Copyright (c) 1998-2005 Kazushi (Jam) Marukawa
12 * All rights of japanized routines are reserved.
13 *
14 * You may distribute under the terms of the Less License.
15 */
16
17
18 /*
19 * Entry point, initialization, miscellaneous routines.
20 */
21
22 #include "less.h"
23 #if MSDOS_COMPILER==WIN32C
24 #include <windows.h>
25 #endif
26
27 public char * every_first_cmd = NULL;
28 public int new_file;
29 public int is_tty;
30 public IFILE curr_ifile = NULL_IFILE;
31 public IFILE old_ifile = NULL_IFILE;
32 public struct scrpos initial_scrpos;
33 public int any_display = FALSE;
34 public POSITION start_attnpos = NULL_POSITION;
35 public POSITION end_attnpos = NULL_POSITION;
36 public int wscroll;
37 public char * progname;
38 public int quitting;
39 public int secure;
40 public int dohelp;
41
42 #if LOGFILE
43 public int logfile = -1;
44 public int force_logfile = FALSE;
45 public char * namelogfile = NULL;
46 #endif
47
48 #if EDITOR
49 public char * editor;
50 public char * editproto;
51 #endif
52
53 #if TAGS
54 extern char * tags;
55 extern char * tagoption;
56 extern int jump_sline;
57 #endif
58
59 #ifdef WIN32
60 static char consoleTitle[256];
61 #endif
62
63 extern int missing_cap;
64 extern int know_dumb;
65
66
67 /*
68 * Entry point.
69 */
70 int
main(argc,argv)71 main(argc, argv)
72 int argc;
73 char *argv[];
74 {
75 IFILE ifile;
76 char *s;
77
78 #ifdef __EMX__
79 _response(&argc, &argv);
80 _wildcard(&argc, &argv);
81 #endif
82
83 progname = *argv++;
84 argc--;
85
86 secure = 0;
87 s = lgetenv("LESSSECURE");
88 if (s != NULL && *s != '\0')
89 secure = 1;
90
91 #ifdef WIN32
92 if (getenv("HOME") == NULL)
93 {
94 /*
95 * If there is no HOME environment variable,
96 * try the concatenation of HOMEDRIVE + HOMEPATH.
97 */
98 char *drive = getenv("HOMEDRIVE");
99 char *path = getenv("HOMEPATH");
100 if (drive != NULL && path != NULL)
101 {
102 char *env = (char *) ecalloc(strlen(drive) +
103 strlen(path) + 6, sizeof(char));
104 strcpy(env, "HOME=");
105 strcat(env, drive);
106 strcat(env, path);
107 putenv(env);
108 }
109 }
110 GetConsoleTitle(consoleTitle, sizeof(consoleTitle)/sizeof(char));
111 #endif /* WIN32 */
112
113 /*
114 * Process command line arguments and LESS environment arguments.
115 * Command line arguments override environment arguments.
116 */
117 is_tty = isatty(1);
118 get_term();
119 init_cmds();
120 init_prompt();
121 init_planeset();
122 init_charset();
123 init_line();
124 init_option();
125 s = lgetenv("LESS");
126 if (s != NULL)
127 scan_option(save(s));
128 #if ISO
129 s = lgetenv("JLESS");
130 if (s != NULL)
131 scan_option(save(s));
132 #endif
133
134 #define isoptstring(s) (((s)[0] == '-' || (s)[0] == '+') && (s)[1] != '\0')
135 while (argc > 0 && (isoptstring(*argv) || isoptpending()))
136 {
137 s = *argv++;
138 argc--;
139 if (strcmp(s, "--") == 0)
140 break;
141 scan_option(s);
142 }
143 #undef isoptstring
144
145 if (isoptpending())
146 {
147 /*
148 * Last command line option was a flag requiring a
149 * following string, but there was no following string.
150 */
151 nopendopt();
152 quit(QUIT_OK);
153 }
154
155 #if EDITOR
156 editor = lgetenv("VISUAL");
157 if (editor == NULL || *editor == '\0')
158 {
159 editor = lgetenv("EDITOR");
160 if (editor == NULL || *editor == '\0')
161 editor = EDIT_PGM;
162 }
163 editproto = lgetenv("LESSEDIT");
164 if (editproto == NULL || *editproto == '\0')
165 editproto = "%E ?lm+%lm. %f";
166 #endif
167
168 /*
169 * Call get_ifile with all the command line filenames
170 * to "register" them with the ifile system.
171 */
172 ifile = NULL_IFILE;
173 if (dohelp)
174 ifile = get_ifile(FAKE_HELPFILE, ifile);
175 while (argc-- > 0)
176 {
177 char *filename;
178 #if (MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC)
179 /*
180 * Because the "shell" doesn't expand filename patterns,
181 * treat each argument as a filename pattern rather than
182 * a single filename.
183 * Expand the pattern and iterate over the expanded list.
184 */
185 struct textlist tlist;
186 char *gfilename;
187
188 gfilename = lglob(*argv++);
189 init_textlist(&tlist, gfilename);
190 filename = NULL;
191 while ((filename = forw_textlist(&tlist, filename)) != NULL)
192 {
193 (void) get_ifile(filename, ifile);
194 ifile = prev_ifile(NULL_IFILE);
195 }
196 free(gfilename);
197 #else
198 filename = shell_quote(*argv);
199 if (filename == NULL)
200 filename = *argv;
201 argv++;
202 (void) get_ifile(filename, ifile);
203 ifile = prev_ifile(NULL_IFILE);
204 #endif
205 }
206 /*
207 * Set up terminal, etc.
208 */
209 if (!is_tty)
210 {
211 /*
212 * Output is not a tty.
213 * Just copy the input file(s) to output.
214 */
215 SET_BINARY(1);
216 if (nifile() == 0)
217 {
218 if (edit_stdin() == 0)
219 cat_file();
220 } else if (edit_first() == 0)
221 {
222 do {
223 cat_file();
224 } while (edit_next(1) == 0);
225 }
226 quit(QUIT_OK);
227 }
228
229 if (missing_cap && !know_dumb)
230 error("WARNING: terminal is not fully functional", NULL_PARG);
231 init_mark();
232 open_getchr();
233 raw_mode(1);
234 init_signals(1);
235
236 /*
237 * Select the first file to examine.
238 */
239 #if TAGS
240 if (tagoption != NULL || strcmp(tags, "-") == 0)
241 {
242 /*
243 * A -t option was given.
244 * Verify that no filenames were also given.
245 * Edit the file selected by the "tags" search,
246 * and search for the proper line in the file.
247 */
248 if (nifile() > 0)
249 {
250 error("No filenames allowed with -t option", NULL_PARG);
251 quit(QUIT_ERROR);
252 }
253 findtag(tagoption);
254 if (edit_tagfile()) /* Edit file which contains the tag */
255 quit(QUIT_ERROR);
256 /*
257 * Search for the line which contains the tag.
258 * Set up initial_scrpos so we display that line.
259 */
260 initial_scrpos.pos = tagsearch();
261 if (initial_scrpos.pos == NULL_POSITION)
262 quit(QUIT_ERROR);
263 initial_scrpos.ln = jump_sline;
264 } else
265 #endif
266 if (nifile() == 0)
267 {
268 if (edit_stdin()) /* Edit standard input */
269 quit(QUIT_ERROR);
270 } else
271 {
272 if (edit_first()) /* Edit first valid file in cmd line */
273 quit(QUIT_ERROR);
274 }
275
276 init();
277 commands();
278 quit(QUIT_OK);
279 /*NOTREACHED*/
280 return (0);
281 }
282
283 /*
284 * Copy a string to a "safe" place
285 * (that is, to a buffer allocated by calloc).
286 */
287 public char *
save(s)288 save(s)
289 char *s;
290 {
291 register char *p;
292
293 p = (char *) ecalloc(strlen(s)+1, sizeof(char));
294 strcpy(p, s);
295 return (p);
296 }
297
298 /*
299 * Allocate memory.
300 * Like calloc(), but never returns an error (NULL).
301 */
302 public VOID_POINTER
ecalloc(count,size)303 ecalloc(count, size)
304 int count;
305 unsigned int size;
306 {
307 register VOID_POINTER p;
308
309 p = (VOID_POINTER) calloc(count, size);
310 if (p != NULL)
311 return (p);
312 error("Cannot allocate memory", NULL_PARG);
313 quit(QUIT_ERROR);
314 /*NOTREACHED*/
315 return (NULL);
316 }
317
318 /*
319 * Skip leading spaces in a string.
320 */
321 public char *
skipsp(s)322 skipsp(s)
323 register char *s;
324 {
325 while (*s == ' ' || *s == '\t')
326 s++;
327 return (s);
328 }
329
330 /*
331 * See how many characters of two strings are identical.
332 * If uppercase is true, the first string must begin with an uppercase
333 * character; the remainder of the first string may be either case.
334 */
335 public int
sprefix(ps,s,uppercase)336 sprefix(ps, s, uppercase)
337 char *ps;
338 char *s;
339 int uppercase;
340 {
341 register int c;
342 register int sc;
343 register int len = 0;
344
345 for ( ; *s != '\0'; s++, ps++)
346 {
347 c = *ps;
348 if (uppercase)
349 {
350 if (len == 0 && SIMPLE_IS_LOWER(c))
351 return (-1);
352 if (SIMPLE_IS_UPPER(c))
353 c = SIMPLE_TO_LOWER(c);
354 }
355 sc = *s;
356 if (len > 0 && SIMPLE_IS_UPPER(sc))
357 sc = SIMPLE_TO_LOWER(sc);
358 if (c != sc)
359 break;
360 len++;
361 }
362 return (len);
363 }
364
365 /*
366 * Exit the program.
367 */
368 public void
quit(status)369 quit(status)
370 int status;
371 {
372 static int save_status;
373
374 /*
375 * Put cursor at bottom left corner, clear the line,
376 * reset the terminal modes, and exit.
377 */
378 if (status < 0)
379 status = save_status;
380 else
381 save_status = status;
382 quitting = 1;
383 edit((char*)NULL);
384 if (any_display && is_tty)
385 clear_bot();
386 deinit();
387 flush();
388 raw_mode(0);
389 #if MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC
390 /*
391 * If we don't close 2, we get some garbage from
392 * 2's buffer when it flushes automatically.
393 * I cannot track this one down RB
394 * The same bug shows up if we use ^C^C to abort.
395 */
396 close(2);
397 #endif
398 #if WIN32
399 SetConsoleTitle(consoleTitle);
400 #endif
401 close_getchr();
402 exit(status);
403 }
404