kernel - Fix races created by a comedy of circumstansces (3)
[dragonfly.git] / contrib / less / main.c
blob149999cd4b537fa1d2b38bb969c18c845305772a
1 /*
2 * Copyright (C) 1984-2015 Mark Nudelman
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.
7 * For more information, see the README file.
8 */
12 * Entry point, initialization, miscellaneous routines.
15 #include "less.h"
16 #if MSDOS_COMPILER==WIN32C
17 #include <windows.h>
18 #endif
20 public char * every_first_cmd = NULL;
21 public int new_file;
22 public int is_tty;
23 public IFILE curr_ifile = NULL_IFILE;
24 public IFILE old_ifile = NULL_IFILE;
25 public struct scrpos initial_scrpos;
26 public int any_display = FALSE;
27 public POSITION start_attnpos = NULL_POSITION;
28 public POSITION end_attnpos = NULL_POSITION;
29 public int wscroll;
30 public char * progname;
31 public int quitting;
32 public int secure;
33 public int dohelp;
35 #if LOGFILE
36 public int logfile = -1;
37 public int force_logfile = FALSE;
38 public char * namelogfile = NULL;
39 #endif
41 #if EDITOR
42 public char * editor;
43 public char * editproto;
44 #endif
46 #if TAGS
47 extern char * tags;
48 extern char * tagoption;
49 extern int jump_sline;
50 #endif
52 #ifdef WIN32
53 static char consoleTitle[256];
54 #endif
56 extern int less_is_more;
57 extern int missing_cap;
58 extern int know_dumb;
59 extern int pr_type;
63 * Entry point.
65 int
66 main(argc, argv)
67 int argc;
68 char *argv[];
70 IFILE ifile;
71 char *s;
73 #ifdef __EMX__
74 _response(&argc, &argv);
75 _wildcard(&argc, &argv);
76 #endif
78 progname = *argv++;
79 argc--;
81 secure = 0;
82 s = lgetenv("LESSSECURE");
83 if (s != NULL && *s != '\0')
84 secure = 1;
86 #ifdef WIN32
87 if (getenv("HOME") == NULL)
90 * If there is no HOME environment variable,
91 * try the concatenation of HOMEDRIVE + HOMEPATH.
93 char *drive = getenv("HOMEDRIVE");
94 char *path = getenv("HOMEPATH");
95 if (drive != NULL && path != NULL)
97 char *env = (char *) ecalloc(strlen(drive) +
98 strlen(path) + 6, sizeof(char));
99 strcpy(env, "HOME=");
100 strcat(env, drive);
101 strcat(env, path);
102 putenv(env);
105 GetConsoleTitle(consoleTitle, sizeof(consoleTitle)/sizeof(char));
106 #endif /* WIN32 */
109 * Process command line arguments and LESS environment arguments.
110 * Command line arguments override environment arguments.
112 is_tty = isatty(1);
113 get_term();
114 init_cmds();
115 init_charset();
116 init_line();
117 init_cmdhist();
118 init_option();
119 init_search();
122 * If the name of the executable program is "more",
123 * act like LESS_IS_MORE is set.
125 for (s = progname + strlen(progname); s > progname; s--)
127 if (s[-1] == PATHNAME_SEP[0])
128 break;
130 if (strcmp(s, "more") == 0)
131 less_is_more = 1;
133 init_prompt();
135 s = lgetenv(less_is_more ? "MORE" : "LESS");
136 if (s != NULL)
137 scan_option(save(s));
139 #define isoptstring(s) (((s)[0] == '-' || (s)[0] == '+') && (s)[1] != '\0')
140 while (argc > 0 && (isoptstring(*argv) || isoptpending()))
142 s = *argv++;
143 argc--;
144 if (strcmp(s, "--") == 0)
145 break;
146 scan_option(s);
148 #undef isoptstring
150 if (isoptpending())
153 * Last command line option was a flag requiring a
154 * following string, but there was no following string.
156 nopendopt();
157 quit(QUIT_OK);
160 #if EDITOR
161 editor = lgetenv("VISUAL");
162 if (editor == NULL || *editor == '\0')
164 editor = lgetenv("EDITOR");
165 if (editor == NULL || *editor == '\0')
166 editor = EDIT_PGM;
168 editproto = lgetenv("LESSEDIT");
169 if (editproto == NULL || *editproto == '\0')
170 editproto = "%E ?lm+%lm. %f";
171 #endif
174 * Call get_ifile with all the command line filenames
175 * to "register" them with the ifile system.
177 ifile = NULL_IFILE;
178 if (dohelp)
179 ifile = get_ifile(FAKE_HELPFILE, ifile);
180 while (argc-- > 0)
182 char *filename;
183 #if (MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC)
185 * Because the "shell" doesn't expand filename patterns,
186 * treat each argument as a filename pattern rather than
187 * a single filename.
188 * Expand the pattern and iterate over the expanded list.
190 struct textlist tlist;
191 char *gfilename;
193 gfilename = lglob(*argv++);
194 init_textlist(&tlist, gfilename);
195 filename = NULL;
196 while ((filename = forw_textlist(&tlist, filename)) != NULL)
198 (void) get_ifile(filename, ifile);
199 ifile = prev_ifile(NULL_IFILE);
201 free(gfilename);
202 #else
203 filename = shell_quote(*argv);
204 if (filename == NULL)
205 filename = *argv;
206 argv++;
207 (void) get_ifile(filename, ifile);
208 ifile = prev_ifile(NULL_IFILE);
209 free(filename);
210 #endif
213 * Set up terminal, etc.
215 if (!is_tty)
218 * Output is not a tty.
219 * Just copy the input file(s) to output.
221 SET_BINARY(1);
222 if (nifile() == 0)
224 if (edit_stdin() == 0)
225 cat_file();
226 } else if (edit_first() == 0)
228 do {
229 cat_file();
230 } while (edit_next(1) == 0);
232 quit(QUIT_OK);
235 if (missing_cap && !know_dumb)
236 error("WARNING: terminal is not fully functional", NULL_PARG);
237 init_mark();
238 open_getchr();
239 raw_mode(1);
240 init_signals(1);
243 * Select the first file to examine.
245 #if TAGS
246 if (tagoption != NULL || strcmp(tags, "-") == 0)
249 * A -t option was given.
250 * Verify that no filenames were also given.
251 * Edit the file selected by the "tags" search,
252 * and search for the proper line in the file.
254 if (nifile() > 0)
256 error("No filenames allowed with -t option", NULL_PARG);
257 quit(QUIT_ERROR);
259 findtag(tagoption);
260 if (edit_tagfile()) /* Edit file which contains the tag */
261 quit(QUIT_ERROR);
263 * Search for the line which contains the tag.
264 * Set up initial_scrpos so we display that line.
266 initial_scrpos.pos = tagsearch();
267 if (initial_scrpos.pos == NULL_POSITION)
268 quit(QUIT_ERROR);
269 initial_scrpos.ln = jump_sline;
270 } else
271 #endif
272 if (nifile() == 0)
274 if (edit_stdin()) /* Edit standard input */
275 quit(QUIT_ERROR);
276 } else
278 if (edit_first()) /* Edit first valid file in cmd line */
279 quit(QUIT_ERROR);
282 init();
283 commands();
284 quit(QUIT_OK);
285 /*NOTREACHED*/
286 return (0);
290 * Copy a string to a "safe" place
291 * (that is, to a buffer allocated by calloc).
293 public char *
294 save(s)
295 char *s;
297 register char *p;
299 p = (char *) ecalloc(strlen(s)+1, sizeof(char));
300 strcpy(p, s);
301 return (p);
305 * Allocate memory.
306 * Like calloc(), but never returns an error (NULL).
308 public VOID_POINTER
309 ecalloc(count, size)
310 int count;
311 unsigned int size;
313 register VOID_POINTER p;
315 p = (VOID_POINTER) calloc(count, size);
316 if (p != NULL)
317 return (p);
318 error("Cannot allocate memory", NULL_PARG);
319 quit(QUIT_ERROR);
320 /*NOTREACHED*/
321 return (NULL);
325 * Skip leading spaces in a string.
327 public char *
328 skipsp(s)
329 register char *s;
331 while (*s == ' ' || *s == '\t')
332 s++;
333 return (s);
337 * See how many characters of two strings are identical.
338 * If uppercase is true, the first string must begin with an uppercase
339 * character; the remainder of the first string may be either case.
341 public int
342 sprefix(ps, s, uppercase)
343 char *ps;
344 char *s;
345 int uppercase;
347 register int c;
348 register int sc;
349 register int len = 0;
351 for ( ; *s != '\0'; s++, ps++)
353 c = *ps;
354 if (uppercase)
356 if (len == 0 && ASCII_IS_LOWER(c))
357 return (-1);
358 if (ASCII_IS_UPPER(c))
359 c = ASCII_TO_LOWER(c);
361 sc = *s;
362 if (len > 0 && ASCII_IS_UPPER(sc))
363 sc = ASCII_TO_LOWER(sc);
364 if (c != sc)
365 break;
366 len++;
368 return (len);
372 * Exit the program.
374 public void
375 quit(status)
376 int status;
378 static int save_status;
381 * Put cursor at bottom left corner, clear the line,
382 * reset the terminal modes, and exit.
384 if (status < 0)
385 status = save_status;
386 else
387 save_status = status;
388 quitting = 1;
389 edit((char*)NULL);
390 save_cmdhist();
391 if (any_display && is_tty)
392 clear_bot();
393 deinit();
394 flush();
395 raw_mode(0);
396 #if MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC
398 * If we don't close 2, we get some garbage from
399 * 2's buffer when it flushes automatically.
400 * I cannot track this one down RB
401 * The same bug shows up if we use ^C^C to abort.
403 close(2);
404 #endif
405 #ifdef WIN32
406 SetConsoleTitle(consoleTitle);
407 #endif
408 close_getchr();
409 exit(status);