Annotation of src/usr.bin/less/main.c, Revision 1.8
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");
124: s = lgetenv("MORE");
1.2 etheisen 125: } else
1.7 millert 126: s = lgetenv("LESS");
127: if (s != NULL)
128: scan_option(save(s));
1.1 etheisen 129:
1.7 millert 130: #define isoptstring(s) (((s)[0] == '-' || (s)[0] == '+') && (s)[1] != '\0')
131: while (argc > 0 && (isoptstring(*argv) || isoptpending()))
1.1 etheisen 132: {
1.7 millert 133: s = *argv++;
134: argc--;
135: if (strcmp(s, "--") == 0)
1.3 deraadt 136: break;
1.7 millert 137: scan_option(s);
1.3 deraadt 138: }
1.1 etheisen 139: #undef isoptstring
140:
141: if (isoptpending())
142: {
143: /*
144: * Last command line option was a flag requiring a
145: * following string, but there was no following string.
146: */
147: nopendopt();
148: quit(QUIT_OK);
149: }
150:
151: #if EDITOR
1.7 millert 152: editor = lgetenv("VISUAL");
1.1 etheisen 153: if (editor == NULL || *editor == '\0')
154: {
1.7 millert 155: editor = lgetenv("EDITOR");
1.1 etheisen 156: if (editor == NULL || *editor == '\0')
157: editor = EDIT_PGM;
158: }
1.7 millert 159: editproto = lgetenv("LESSEDIT");
1.1 etheisen 160: if (editproto == NULL || *editproto == '\0')
161: editproto = "%E ?lm+%lm. %f";
162: #endif
163:
164: /*
165: * Call get_ifile with all the command line filenames
166: * to "register" them with the ifile system.
167: */
168: ifile = NULL_IFILE;
1.7 millert 169: while (argc-- > 0)
1.1 etheisen 170: {
1.7 millert 171: char *filename;
172: #if (MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC)
1.1 etheisen 173: /*
174: * Because the "shell" doesn't expand filename patterns,
175: * treat each argument as a filename pattern rather than
176: * a single filename.
177: * Expand the pattern and iterate over the expanded list.
178: */
179: struct textlist tlist;
180: char *gfilename;
181:
1.7 millert 182: gfilename = lglob(*argv++);
1.1 etheisen 183: init_textlist(&tlist, gfilename);
184: filename = NULL;
185: while ((filename = forw_textlist(&tlist, filename)) != NULL)
1.7 millert 186: {
187: (void) get_ifile(filename, ifile);
188: ifile = prev_ifile(NULL_IFILE);
189: }
1.1 etheisen 190: free(gfilename);
191: #else
1.7 millert 192: filename = shell_quote(*argv);
193: if (filename == NULL)
194: filename = *argv;
195: argv++;
196: (void) get_ifile(filename, ifile);
197: ifile = prev_ifile(NULL_IFILE);
1.1 etheisen 198: #endif
199: }
200: /*
201: * Set up terminal, etc.
202: */
203: if (!is_tty)
204: {
205: /*
206: * Output is not a tty.
207: * Just copy the input file(s) to output.
208: */
1.7 millert 209: SET_BINARY(1);
1.1 etheisen 210: if (nifile() == 0)
211: {
212: if (edit_stdin() == 0)
213: cat_file();
214: } else if (edit_first() == 0)
215: {
216: do {
217: cat_file();
218: } while (edit_next(1) == 0);
219: }
220: quit(QUIT_OK);
221: }
222:
1.7 millert 223: if (missing_cap && !know_dumb && !ismore)
224: error("WARNING: terminal is not fully functional", NULL_PARG);
1.1 etheisen 225: init_mark();
1.7 millert 226: open_getchr();
1.1 etheisen 227: raw_mode(1);
228: init_signals(1);
229:
230: /*
231: * Select the first file to examine.
232: */
233: #if TAGS
1.7 millert 234: if (tagoption != NULL || strcmp(tags, "-") == 0)
1.1 etheisen 235: {
236: /*
237: * A -t option was given.
238: * Verify that no filenames were also given.
239: * Edit the file selected by the "tags" search,
240: * and search for the proper line in the file.
241: */
242: if (nifile() > 0)
243: {
244: error("No filenames allowed with -t option", NULL_PARG);
245: quit(QUIT_ERROR);
246: }
247: findtag(tagoption);
1.7 millert 248: if (edit_tagfile()) /* Edit file which contains the tag */
1.1 etheisen 249: quit(QUIT_ERROR);
250: /*
251: * Search for the line which contains the tag.
252: * Set up initial_scrpos so we display that line.
253: */
254: initial_scrpos.pos = tagsearch();
255: if (initial_scrpos.pos == NULL_POSITION)
256: quit(QUIT_ERROR);
257: initial_scrpos.ln = jump_sline;
258: } else
259: #endif
260: if (nifile() == 0)
261: {
262: if (edit_stdin()) /* Edit standard input */
263: quit(QUIT_ERROR);
264: } else
265: {
266: if (edit_first()) /* Edit first valid file in cmd line */
267: quit(QUIT_ERROR);
268: }
269:
270: init();
271: commands();
272: quit(QUIT_OK);
273: /*NOTREACHED*/
1.7 millert 274: return (0);
1.1 etheisen 275: }
276:
277: /*
278: * Copy a string to a "safe" place
279: * (that is, to a buffer allocated by calloc).
280: */
281: public char *
282: save(s)
283: char *s;
284: {
1.7 millert 285: register char *p;
1.6 deraadt 286: size_t len;
1.1 etheisen 287:
1.7 millert 288: len = strlen(s)+1, sizeof(char);
1.6 deraadt 289: p = (char *) ecalloc(len, sizeof(char));
290: strlcpy(p, s, len);
1.1 etheisen 291: return (p);
292: }
293:
294: /*
295: * Allocate memory.
296: * Like calloc(), but never returns an error (NULL).
297: */
298: public VOID_POINTER
299: ecalloc(count, size)
300: int count;
301: unsigned int size;
302: {
1.7 millert 303: register VOID_POINTER p;
1.1 etheisen 304:
305: p = (VOID_POINTER) calloc(count, size);
306: if (p != NULL)
307: return (p);
308: error("Cannot allocate memory", NULL_PARG);
309: quit(QUIT_ERROR);
310: /*NOTREACHED*/
1.7 millert 311: return (NULL);
1.1 etheisen 312: }
313:
314: /*
315: * Skip leading spaces in a string.
316: */
317: public char *
318: skipsp(s)
1.7 millert 319: register char *s;
1.1 etheisen 320: {
321: while (*s == ' ' || *s == '\t')
322: s++;
323: return (s);
324: }
325:
326: /*
1.7 millert 327: * See how many characters of two strings are identical.
328: * If uppercase is true, the first string must begin with an uppercase
329: * character; the remainder of the first string may be either case.
330: */
331: public int
332: sprefix(ps, s, uppercase)
333: char *ps;
334: char *s;
335: int uppercase;
336: {
337: register int c;
338: register int sc;
339: register int len = 0;
340:
341: for ( ; *s != '\0'; s++, ps++)
342: {
343: c = *ps;
344: if (uppercase)
345: {
346: if (len == 0 && SIMPLE_IS_LOWER(c))
347: return (-1);
348: if (SIMPLE_IS_UPPER(c))
349: c = SIMPLE_TO_LOWER(c);
350: }
351: sc = *s;
352: if (len > 0 && SIMPLE_IS_UPPER(sc))
353: sc = SIMPLE_TO_LOWER(sc);
354: if (c != sc)
355: break;
356: len++;
357: }
358: return (len);
359: }
360:
361: /*
1.1 etheisen 362: * Exit the program.
363: */
364: public void
365: quit(status)
366: int status;
367: {
368: static int save_status;
369:
370: /*
371: * Put cursor at bottom left corner, clear the line,
372: * reset the terminal modes, and exit.
373: */
374: if (status < 0)
375: status = save_status;
376: else
377: save_status = status;
378: quitting = 1;
379: edit((char*)NULL);
1.7 millert 380: if (any_display && is_tty)
1.1 etheisen 381: clear_bot();
382: deinit();
383: flush();
384: raw_mode(0);
1.7 millert 385: #if MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC
1.1 etheisen 386: /*
387: * If we don't close 2, we get some garbage from
388: * 2's buffer when it flushes automatically.
389: * I cannot track this one down RB
390: * The same bug shows up if we use ^C^C to abort.
391: */
392: close(2);
393: #endif
1.7 millert 394: #if WIN32
395: SetConsoleTitle(consoleTitle);
396: #endif
397: close_getchr();
1.1 etheisen 398: exit(status);
399: }
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