Annotation of src/usr.bin/less/main.c, Revision 1.13
1.1 etheisen 1: /*
1.13 ! shadchin 2: * Copyright (C) 1984-2012 Mark Nudelman
1.1 etheisen 3: *
1.7 millert 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.
1.1 etheisen 6: *
1.13 ! shadchin 7: * For more information, see the README file.
1.1 etheisen 8: */
9:
10:
11: /*
12: * Entry point, initialization, miscellaneous routines.
13: */
14:
15: #include "less.h"
1.7 millert 16: #if MSDOS_COMPILER==WIN32C
17: #include <windows.h>
18: #endif
1.1 etheisen 19:
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;
1.7 millert 27: public POSITION start_attnpos = NULL_POSITION;
28: public POSITION end_attnpos = NULL_POSITION;
1.1 etheisen 29: public int wscroll;
30: public char * progname;
31: public int quitting;
1.7 millert 32: public int secure;
1.11 shadchin 33: public int dohelp;
1.1 etheisen 34:
35: #if LOGFILE
36: public int logfile = -1;
37: public int force_logfile = FALSE;
38: public char * namelogfile = NULL;
39: #endif
40:
41: #if EDITOR
42: public char * editor;
43: public char * editproto;
44: #endif
45:
46: #if TAGS
1.7 millert 47: extern char * tags;
1.1 etheisen 48: extern char * tagoption;
49: extern int jump_sline;
50: #endif
51:
1.7 millert 52: #ifdef WIN32
53: static char consoleTitle[256];
54: #endif
1.1 etheisen 55:
1.11 shadchin 56: extern int less_is_more;
1.7 millert 57: extern int missing_cap;
58: extern int know_dumb;
1.11 shadchin 59: extern int quit_if_one_screen;
60: extern int pr_type;
1.7 millert 61:
1.1 etheisen 62:
63: /*
64: * Entry point.
65: */
66: int
67: main(argc, argv)
68: int argc;
69: char *argv[];
70: {
71: IFILE ifile;
1.7 millert 72: char *s;
1.1 etheisen 73:
74: #ifdef __EMX__
75: _response(&argc, &argv);
76: _wildcard(&argc, &argv);
77: #endif
78:
79: progname = *argv++;
1.7 millert 80: argc--;
81:
82: secure = 0;
83: s = lgetenv("LESSSECURE");
84: if (s != NULL && *s != '\0')
85: secure = 1;
86:
87: #ifdef WIN32
88: if (getenv("HOME") == NULL)
89: {
90: /*
91: * If there is no HOME environment variable,
92: * try the concatenation of HOMEDRIVE + HOMEPATH.
93: */
94: char *drive = getenv("HOMEDRIVE");
95: char *path = getenv("HOMEPATH");
96: if (drive != NULL && path != NULL)
97: {
98: size_t len = strlen(drive) + strlen(path) + 6;
99: char *env = (char *) ecalloc(len, sizeof(char));
100: strlcpy(env, "HOME=", len);
101: strlcat(env, drive, len);
102: strlcat(env, path, len);
103: putenv(env);
104: }
105: }
106: GetConsoleTitle(consoleTitle, sizeof(consoleTitle)/sizeof(char));
107: #endif /* WIN32 */
1.1 etheisen 108:
109: /*
110: * Process command line arguments and LESS environment arguments.
111: * Command line arguments override environment arguments.
112: */
1.7 millert 113: is_tty = isatty(1);
1.1 etheisen 114: get_term();
115: init_cmds();
116: init_charset();
1.7 millert 117: init_line();
1.11 shadchin 118: init_cmdhist();
1.1 etheisen 119: init_option();
1.11 shadchin 120: init_search();
121:
122: /*
123: * If the name of the executable program is "more",
124: * act like LESS_IS_MORE is set.
125: */
126: for (s = progname + strlen(progname); s > progname; s--)
127: {
128: if (s[-1] == PATHNAME_SEP[0])
129: break;
130: }
131: if (strcmp(s, "more") == 0)
132: less_is_more = 1;
133:
134: init_prompt();
135:
136: if (less_is_more) {
1.2 etheisen 137: scan_option("-G");
1.7 millert 138: scan_option("-L");
1.11 shadchin 139: scan_option("-X");
1.12 nicm 140: scan_option("-c");
1.11 shadchin 141: }
142:
143: s = lgetenv(less_is_more ? "MORE" : "LESS");
1.7 millert 144: if (s != NULL)
145: scan_option(save(s));
1.1 etheisen 146:
1.7 millert 147: #define isoptstring(s) (((s)[0] == '-' || (s)[0] == '+') && (s)[1] != '\0')
148: while (argc > 0 && (isoptstring(*argv) || isoptpending()))
1.1 etheisen 149: {
1.7 millert 150: s = *argv++;
151: argc--;
152: if (strcmp(s, "--") == 0)
1.3 deraadt 153: break;
1.7 millert 154: scan_option(s);
1.3 deraadt 155: }
1.1 etheisen 156: #undef isoptstring
157:
158: if (isoptpending())
159: {
160: /*
161: * Last command line option was a flag requiring a
162: * following string, but there was no following string.
163: */
164: nopendopt();
165: quit(QUIT_OK);
166: }
167:
1.11 shadchin 168: if (less_is_more && get_quit_at_eof())
169: quit_if_one_screen = TRUE;
170:
1.1 etheisen 171: #if EDITOR
1.7 millert 172: editor = lgetenv("VISUAL");
1.1 etheisen 173: if (editor == NULL || *editor == '\0')
174: {
1.7 millert 175: editor = lgetenv("EDITOR");
1.1 etheisen 176: if (editor == NULL || *editor == '\0')
177: editor = EDIT_PGM;
178: }
1.7 millert 179: editproto = lgetenv("LESSEDIT");
1.1 etheisen 180: if (editproto == NULL || *editproto == '\0')
181: editproto = "%E ?lm+%lm. %f";
182: #endif
183:
184: /*
185: * Call get_ifile with all the command line filenames
186: * to "register" them with the ifile system.
187: */
188: ifile = NULL_IFILE;
1.11 shadchin 189: #if !SMALL
190: if (dohelp)
191: ifile = get_ifile(HELPFILE, ifile);
192: #endif /* !SMALL */
1.7 millert 193: while (argc-- > 0)
1.1 etheisen 194: {
1.7 millert 195: char *filename;
196: #if (MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC)
1.1 etheisen 197: /*
198: * Because the "shell" doesn't expand filename patterns,
199: * treat each argument as a filename pattern rather than
200: * a single filename.
201: * Expand the pattern and iterate over the expanded list.
202: */
203: struct textlist tlist;
204: char *gfilename;
205:
1.7 millert 206: gfilename = lglob(*argv++);
1.1 etheisen 207: init_textlist(&tlist, gfilename);
208: filename = NULL;
209: while ((filename = forw_textlist(&tlist, filename)) != NULL)
1.7 millert 210: {
211: (void) get_ifile(filename, ifile);
212: ifile = prev_ifile(NULL_IFILE);
213: }
1.1 etheisen 214: free(gfilename);
215: #else
1.7 millert 216: filename = shell_quote(*argv);
217: if (filename == NULL)
218: filename = *argv;
219: argv++;
220: (void) get_ifile(filename, ifile);
221: ifile = prev_ifile(NULL_IFILE);
1.13 ! shadchin 222: free(filename);
1.1 etheisen 223: #endif
224: }
225: /*
226: * Set up terminal, etc.
227: */
228: if (!is_tty)
229: {
230: /*
231: * Output is not a tty.
232: * Just copy the input file(s) to output.
233: */
1.7 millert 234: SET_BINARY(1);
1.1 etheisen 235: if (nifile() == 0)
236: {
237: if (edit_stdin() == 0)
238: cat_file();
239: } else if (edit_first() == 0)
240: {
241: do {
242: cat_file();
243: } while (edit_next(1) == 0);
244: }
245: quit(QUIT_OK);
246: }
247:
1.11 shadchin 248: if (missing_cap && !know_dumb && !less_is_more)
1.7 millert 249: error("WARNING: terminal is not fully functional", NULL_PARG);
1.1 etheisen 250: init_mark();
1.7 millert 251: open_getchr();
1.1 etheisen 252: raw_mode(1);
253: init_signals(1);
254:
255: /*
256: * Select the first file to examine.
257: */
258: #if TAGS
1.7 millert 259: if (tagoption != NULL || strcmp(tags, "-") == 0)
1.1 etheisen 260: {
261: /*
262: * A -t option was given.
263: * Verify that no filenames were also given.
264: * Edit the file selected by the "tags" search,
265: * and search for the proper line in the file.
266: */
267: if (nifile() > 0)
268: {
269: error("No filenames allowed with -t option", NULL_PARG);
270: quit(QUIT_ERROR);
271: }
272: findtag(tagoption);
1.7 millert 273: if (edit_tagfile()) /* Edit file which contains the tag */
1.1 etheisen 274: quit(QUIT_ERROR);
275: /*
276: * Search for the line which contains the tag.
277: * Set up initial_scrpos so we display that line.
278: */
279: initial_scrpos.pos = tagsearch();
280: if (initial_scrpos.pos == NULL_POSITION)
281: quit(QUIT_ERROR);
282: initial_scrpos.ln = jump_sline;
283: } else
284: #endif
285: if (nifile() == 0)
286: {
287: if (edit_stdin()) /* Edit standard input */
288: quit(QUIT_ERROR);
289: } else
290: {
291: if (edit_first()) /* Edit first valid file in cmd line */
292: quit(QUIT_ERROR);
293: }
294:
295: init();
296: commands();
297: quit(QUIT_OK);
298: /*NOTREACHED*/
1.7 millert 299: return (0);
1.1 etheisen 300: }
301:
302: /*
303: * Copy a string to a "safe" place
304: * (that is, to a buffer allocated by calloc).
305: */
306: public char *
307: save(s)
308: char *s;
309: {
1.7 millert 310: register char *p;
1.11 shadchin 311: size_t len = strlen(s) + 1;
1.1 etheisen 312:
1.6 deraadt 313: p = (char *) ecalloc(len, sizeof(char));
314: strlcpy(p, s, len);
1.1 etheisen 315: return (p);
316: }
317:
318: /*
319: * Allocate memory.
320: * Like calloc(), but never returns an error (NULL).
321: */
322: public VOID_POINTER
323: ecalloc(count, size)
324: int count;
325: unsigned int size;
326: {
1.7 millert 327: register VOID_POINTER p;
1.1 etheisen 328:
329: p = (VOID_POINTER) calloc(count, size);
330: if (p != NULL)
331: return (p);
332: error("Cannot allocate memory", NULL_PARG);
333: quit(QUIT_ERROR);
334: /*NOTREACHED*/
1.7 millert 335: return (NULL);
1.1 etheisen 336: }
337:
338: /*
339: * Skip leading spaces in a string.
340: */
341: public char *
342: skipsp(s)
1.7 millert 343: register char *s;
1.1 etheisen 344: {
345: while (*s == ' ' || *s == '\t')
346: s++;
347: return (s);
348: }
349:
1.11 shadchin 350: #if GNU_OPTIONS
1.1 etheisen 351: /*
1.7 millert 352: * See how many characters of two strings are identical.
353: * If uppercase is true, the first string must begin with an uppercase
354: * character; the remainder of the first string may be either case.
355: */
356: public int
357: sprefix(ps, s, uppercase)
358: char *ps;
359: char *s;
360: int uppercase;
361: {
362: register int c;
363: register int sc;
364: register int len = 0;
365:
366: for ( ; *s != '\0'; s++, ps++)
367: {
368: c = *ps;
369: if (uppercase)
370: {
1.11 shadchin 371: if (len == 0 && ASCII_IS_LOWER(c))
1.7 millert 372: return (-1);
1.11 shadchin 373: if (ASCII_IS_UPPER(c))
374: c = ASCII_TO_LOWER(c);
1.7 millert 375: }
376: sc = *s;
1.11 shadchin 377: if (len > 0 && ASCII_IS_UPPER(sc))
378: sc = ASCII_TO_LOWER(sc);
1.7 millert 379: if (c != sc)
380: break;
381: len++;
382: }
383: return (len);
384: }
1.11 shadchin 385: #endif /* GNU_OPTIONS */
1.7 millert 386:
387: /*
1.1 etheisen 388: * Exit the program.
389: */
390: public void
391: quit(status)
392: int status;
393: {
394: static int save_status;
395:
396: /*
397: * Put cursor at bottom left corner, clear the line,
398: * reset the terminal modes, and exit.
399: */
400: if (status < 0)
401: status = save_status;
402: else
403: save_status = status;
404: quitting = 1;
405: edit((char*)NULL);
1.11 shadchin 406: save_cmdhist();
1.7 millert 407: if (any_display && is_tty)
1.1 etheisen 408: clear_bot();
409: deinit();
410: flush();
411: raw_mode(0);
1.7 millert 412: #if MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC
1.1 etheisen 413: /*
414: * If we don't close 2, we get some garbage from
415: * 2's buffer when it flushes automatically.
416: * I cannot track this one down RB
417: * The same bug shows up if we use ^C^C to abort.
418: */
419: close(2);
420: #endif
1.11 shadchin 421: #ifdef WIN32
1.7 millert 422: SetConsoleTitle(consoleTitle);
423: #endif
424: close_getchr();
1.1 etheisen 425: exit(status);
426: }
![[BACK]](/icons/back.gif){kind=icon}
Return to main.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / less