Annotation of src/usr.bin/less/main.c, Revision 1.9
1.1 etheisen 1: /*
1.7 millert 2: * Copyright (C) 1984-2002 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: *
1.7 millert 7: * For more information about less, or for information on how to
8: * contact the author, see the README file.
1.1 etheisen 9: */
10:
11:
12: /*
13: * Entry point, initialization, miscellaneous routines.
14: */
15:
16: #include "less.h"
1.7 millert 17: #if MSDOS_COMPILER==WIN32C
18: #include <windows.h>
19: #endif
1.1 etheisen 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;
1.7 millert 28: public POSITION start_attnpos = NULL_POSITION;
29: public POSITION end_attnpos = NULL_POSITION;
1.1 etheisen 30: public int wscroll;
31: public char * progname;
32: public int quitting;
1.7 millert 33: public int secure;
34: public int ismore;
1.1 etheisen 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
1.7 millert 48: extern char * tags;
1.1 etheisen 49: extern char * tagoption;
50: extern int jump_sline;
51: #endif
52:
1.7 millert 53: #ifdef WIN32
54: static char consoleTitle[256];
55: #endif
1.1 etheisen 56:
1.7 millert 57: extern int missing_cap;
58: extern int know_dumb;
59:
60: extern char * __progname;
1.1 etheisen 61:
62: /*
63: * Entry point.
64: */
65: int
66: main(argc, argv)
67: int argc;
68: char *argv[];
69: {
70: IFILE ifile;
1.7 millert 71: char *s;
1.1 etheisen 72:
73: #ifdef __EMX__
74: _response(&argc, &argv);
75: _wildcard(&argc, &argv);
76: #endif
77:
78: progname = *argv++;
1.7 millert 79: argc--;
80:
81: secure = 0;
82: s = lgetenv("LESSSECURE");
83: if (s != NULL && *s != '\0')
84: secure = 1;
85:
86: #ifdef WIN32
87: if (getenv("HOME") == NULL)
88: {
89: /*
90: * If there is no HOME environment variable,
91: * try the concatenation of HOMEDRIVE + HOMEPATH.
92: */
93: char *drive = getenv("HOMEDRIVE");
94: char *path = getenv("HOMEPATH");
95: if (drive != NULL && path != NULL)
96: {
97: size_t len = strlen(drive) + strlen(path) + 6;
98: char *env = (char *) ecalloc(len, sizeof(char));
99: strlcpy(env, "HOME=", len);
100: strlcat(env, drive, len);
101: strlcat(env, path, len);
102: putenv(env);
103: }
104: }
105: GetConsoleTitle(consoleTitle, sizeof(consoleTitle)/sizeof(char));
106: #endif /* WIN32 */
1.1 etheisen 107:
108: /*
109: * Process command line arguments and LESS environment arguments.
110: * Command line arguments override environment arguments.
111: */
1.7 millert 112: ismore = !strcmp(__progname, "more");
113: is_tty = isatty(1);
1.1 etheisen 114: get_term();
115: init_cmds();
116: init_prompt();
117: init_charset();
1.7 millert 118: init_line();
1.1 etheisen 119: init_option();
1.7 millert 120: if (ismore) {
1.2 etheisen 121: scan_option("-E");
122: scan_option("-G");
1.7 millert 123: scan_option("-L");
1.9 ! millert 124: scan_option("-m");
1.7 millert 125: s = lgetenv("MORE");
1.2 etheisen 126: } else
1.7 millert 127: s = lgetenv("LESS");
128: if (s != NULL)
129: scan_option(save(s));
1.1 etheisen 130:
1.7 millert 131: #define isoptstring(s) (((s)[0] == '-' || (s)[0] == '+') && (s)[1] != '\0')
132: while (argc > 0 && (isoptstring(*argv) || isoptpending()))
1.1 etheisen 133: {
1.7 millert 134: s = *argv++;
135: argc--;
136: if (strcmp(s, "--") == 0)
1.3 deraadt 137: break;
1.7 millert 138: scan_option(s);
1.3 deraadt 139: }
1.1 etheisen 140: #undef isoptstring
141:
142: if (isoptpending())
143: {
144: /*
145: * Last command line option was a flag requiring a
146: * following string, but there was no following string.
147: */
148: nopendopt();
149: quit(QUIT_OK);
150: }
151:
152: #if EDITOR
1.7 millert 153: editor = lgetenv("VISUAL");
1.1 etheisen 154: if (editor == NULL || *editor == '\0')
155: {
1.7 millert 156: editor = lgetenv("EDITOR");
1.1 etheisen 157: if (editor == NULL || *editor == '\0')
158: editor = EDIT_PGM;
159: }
1.7 millert 160: editproto = lgetenv("LESSEDIT");
1.1 etheisen 161: if (editproto == NULL || *editproto == '\0')
162: editproto = "%E ?lm+%lm. %f";
163: #endif
164:
165: /*
166: * Call get_ifile with all the command line filenames
167: * to "register" them with the ifile system.
168: */
169: ifile = NULL_IFILE;
1.7 millert 170: while (argc-- > 0)
1.1 etheisen 171: {
1.7 millert 172: char *filename;
173: #if (MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC)
1.1 etheisen 174: /*
175: * Because the "shell" doesn't expand filename patterns,
176: * treat each argument as a filename pattern rather than
177: * a single filename.
178: * Expand the pattern and iterate over the expanded list.
179: */
180: struct textlist tlist;
181: char *gfilename;
182:
1.7 millert 183: gfilename = lglob(*argv++);
1.1 etheisen 184: init_textlist(&tlist, gfilename);
185: filename = NULL;
186: while ((filename = forw_textlist(&tlist, filename)) != NULL)
1.7 millert 187: {
188: (void) get_ifile(filename, ifile);
189: ifile = prev_ifile(NULL_IFILE);
190: }
1.1 etheisen 191: free(gfilename);
192: #else
1.7 millert 193: filename = shell_quote(*argv);
194: if (filename == NULL)
195: filename = *argv;
196: argv++;
197: (void) get_ifile(filename, ifile);
198: ifile = prev_ifile(NULL_IFILE);
1.1 etheisen 199: #endif
200: }
201: /*
202: * Set up terminal, etc.
203: */
204: if (!is_tty)
205: {
206: /*
207: * Output is not a tty.
208: * Just copy the input file(s) to output.
209: */
1.7 millert 210: SET_BINARY(1);
1.1 etheisen 211: if (nifile() == 0)
212: {
213: if (edit_stdin() == 0)
214: cat_file();
215: } else if (edit_first() == 0)
216: {
217: do {
218: cat_file();
219: } while (edit_next(1) == 0);
220: }
221: quit(QUIT_OK);
222: }
223:
1.7 millert 224: if (missing_cap && !know_dumb && !ismore)
225: error("WARNING: terminal is not fully functional", NULL_PARG);
1.1 etheisen 226: init_mark();
1.7 millert 227: open_getchr();
1.1 etheisen 228: raw_mode(1);
229: init_signals(1);
230:
231: /*
232: * Select the first file to examine.
233: */
234: #if TAGS
1.7 millert 235: if (tagoption != NULL || strcmp(tags, "-") == 0)
1.1 etheisen 236: {
237: /*
238: * A -t option was given.
239: * Verify that no filenames were also given.
240: * Edit the file selected by the "tags" search,
241: * and search for the proper line in the file.
242: */
243: if (nifile() > 0)
244: {
245: error("No filenames allowed with -t option", NULL_PARG);
246: quit(QUIT_ERROR);
247: }
248: findtag(tagoption);
1.7 millert 249: if (edit_tagfile()) /* Edit file which contains the tag */
1.1 etheisen 250: quit(QUIT_ERROR);
251: /*
252: * Search for the line which contains the tag.
253: * Set up initial_scrpos so we display that line.
254: */
255: initial_scrpos.pos = tagsearch();
256: if (initial_scrpos.pos == NULL_POSITION)
257: quit(QUIT_ERROR);
258: initial_scrpos.ln = jump_sline;
259: } else
260: #endif
261: if (nifile() == 0)
262: {
263: if (edit_stdin()) /* Edit standard input */
264: quit(QUIT_ERROR);
265: } else
266: {
267: if (edit_first()) /* Edit first valid file in cmd line */
268: quit(QUIT_ERROR);
269: }
270:
271: init();
272: commands();
273: quit(QUIT_OK);
274: /*NOTREACHED*/
1.7 millert 275: return (0);
1.1 etheisen 276: }
277:
278: /*
279: * Copy a string to a "safe" place
280: * (that is, to a buffer allocated by calloc).
281: */
282: public char *
283: save(s)
284: char *s;
285: {
1.7 millert 286: register char *p;
1.6 deraadt 287: size_t len;
1.1 etheisen 288:
1.7 millert 289: len = strlen(s)+1, sizeof(char);
1.6 deraadt 290: p = (char *) ecalloc(len, sizeof(char));
291: strlcpy(p, s, len);
1.1 etheisen 292: return (p);
293: }
294:
295: /*
296: * Allocate memory.
297: * Like calloc(), but never returns an error (NULL).
298: */
299: public VOID_POINTER
300: ecalloc(count, size)
301: int count;
302: unsigned int size;
303: {
1.7 millert 304: register VOID_POINTER p;
1.1 etheisen 305:
306: p = (VOID_POINTER) calloc(count, size);
307: if (p != NULL)
308: return (p);
309: error("Cannot allocate memory", NULL_PARG);
310: quit(QUIT_ERROR);
311: /*NOTREACHED*/
1.7 millert 312: return (NULL);
1.1 etheisen 313: }
314:
315: /*
316: * Skip leading spaces in a string.
317: */
318: public char *
319: skipsp(s)
1.7 millert 320: register char *s;
1.1 etheisen 321: {
322: while (*s == ' ' || *s == '\t')
323: s++;
324: return (s);
325: }
326:
327: /*
1.7 millert 328: * See how many characters of two strings are identical.
329: * If uppercase is true, the first string must begin with an uppercase
330: * character; the remainder of the first string may be either case.
331: */
332: public int
333: sprefix(ps, s, uppercase)
334: char *ps;
335: char *s;
336: int uppercase;
337: {
338: register int c;
339: register int sc;
340: register int len = 0;
341:
342: for ( ; *s != '\0'; s++, ps++)
343: {
344: c = *ps;
345: if (uppercase)
346: {
347: if (len == 0 && SIMPLE_IS_LOWER(c))
348: return (-1);
349: if (SIMPLE_IS_UPPER(c))
350: c = SIMPLE_TO_LOWER(c);
351: }
352: sc = *s;
353: if (len > 0 && SIMPLE_IS_UPPER(sc))
354: sc = SIMPLE_TO_LOWER(sc);
355: if (c != sc)
356: break;
357: len++;
358: }
359: return (len);
360: }
361:
362: /*
1.1 etheisen 363: * Exit the program.
364: */
365: public void
366: quit(status)
367: int status;
368: {
369: static int save_status;
370:
371: /*
372: * Put cursor at bottom left corner, clear the line,
373: * reset the terminal modes, and exit.
374: */
375: if (status < 0)
376: status = save_status;
377: else
378: save_status = status;
379: quitting = 1;
380: edit((char*)NULL);
1.7 millert 381: if (any_display && is_tty)
1.1 etheisen 382: clear_bot();
383: deinit();
384: flush();
385: raw_mode(0);
1.7 millert 386: #if MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC
1.1 etheisen 387: /*
388: * If we don't close 2, we get some garbage from
389: * 2's buffer when it flushes automatically.
390: * I cannot track this one down RB
391: * The same bug shows up if we use ^C^C to abort.
392: */
393: close(2);
394: #endif
1.7 millert 395: #if WIN32
396: SetConsoleTitle(consoleTitle);
397: #endif
398: close_getchr();
1.1 etheisen 399: exit(status);
400: }
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