2 * Copyright (C) 1984-2012 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.
12 * Handling functions for command line options.
14 * Most options are handled by the generic code in option.c.
15 * But all string options, and a few non-string options, require
16 * special handling specific to the particular option.
17 * This special processing is done by the "handling functions" in this file.
19 * Each handling function is passed a "type" and, if it is a string
20 * option, the string which should be "assigned" to the option.
21 * The type may be one of:
22 * INIT The option is being initialized from the command line.
23 * TOGGLE The option is being changed from within the program.
24 * QUERY The setting of the option is merely being queried.
33 extern int plusoption;
39 extern int any_display;
40 extern char openquote;
41 extern char closequote;
42 extern char *prproto[];
46 extern IFILE curr_ifile;
47 extern char version[];
48 extern int jump_sline;
49 extern int jump_sline_fraction;
50 extern int shift_count;
51 extern int shift_count_fraction;
52 extern int less_is_more;
54 extern char *namelogfile;
55 extern int force_logfile;
59 public char *tagoption = NULL;
63 extern int nm_fg_color, nm_bg_color;
64 extern int bo_fg_color, bo_bg_color;
65 extern int ul_fg_color, ul_bg_color;
66 extern int so_fg_color, so_bg_color;
67 extern int bl_fg_color, bl_bg_color;
73 * Handler for -o option.
84 error("log file support is not available", NULL_PARG);
93 if (ch_getflags() & CH_CANSEEK)
95 error("Input is not a pipe", NULL_PARG);
100 error("Log file is already in use", NULL_PARG);
104 namelogfile = lglob(s);
105 use_logfile(namelogfile);
110 error("No log file", NULL_PARG);
113 parg.p_string = namelogfile;
114 error("Log file \"%s\"", &parg);
121 * Handler for -O option.
128 force_logfile = TRUE;
134 * Handlers for -j option.
153 jump_sline_fraction = getfraction(&s, "j", &err);
155 error("Invalid line fraction", NULL_PARG);
160 int sline = getnum(&s, "j", &err);
162 error("Invalid line number", NULL_PARG);
166 jump_sline_fraction = -1;
171 if (jump_sline_fraction < 0)
173 parg.p_int = jump_sline;
174 error("Position target at screen line %d", &parg);
178 sprintf(buf, ".%06d", jump_sline_fraction);
180 while (len > 2 && buf[len-1] == '0')
184 error("Position target at screen position %s", &parg);
193 if (jump_sline_fraction < 0)
195 jump_sline = sc_height * jump_sline_fraction / NUM_FRAC_DENOM;
199 * Handlers for -# option.
218 shift_count_fraction = getfraction(&s, "#", &err);
220 error("Invalid column fraction", NULL_PARG);
225 int hs = getnum(&s, "#", &err);
227 error("Invalid column number", NULL_PARG);
231 shift_count_fraction = -1;
236 if (shift_count_fraction < 0)
238 parg.p_int = shift_count;
239 error("Horizontal shift %d columns", &parg);
243 sprintf(buf, ".%06d", shift_count_fraction);
245 while (len > 2 && buf[len-1] == '0')
249 error("Horizontal shift %s of screen width", &parg);
257 if (shift_count_fraction < 0)
259 shift_count = sc_width * shift_count_fraction / NUM_FRAC_DENOM;
276 error("Cannot use lesskey file \"%s\"", &parg);
285 * Handler for -t option.
299 /* Do the rest in main() */
304 error("tags support is not available", NULL_PARG);
308 save_ifile = save_curr_ifile();
310 * Try to open the file containing the tag
311 * and search for the tag in that file.
313 if (edit_tagfile() || (pos = tagsearch()) == NULL_POSITION)
315 /* Failed: reopen the old file. */
316 reedit_ifile(save_ifile);
319 unsave_ifile(save_ifile);
320 jump_loc(pos, jump_sline);
326 * Handler for -T option.
345 parg.p_string = tags;
346 error("Tags file \"%s\"", &parg);
353 * Handler for -p option.
364 * Unget a search command for the specified string.
365 * {{ This won't work if the "/" command is
366 * changed or invalidated by a .lesskey file. }}
371 * In "more" mode, the -p argument is a command,
372 * not a search string, so we don't need a slash.
381 * Handler for -P option.
388 register char **proto;
396 * Figure out which prototype string should be changed.
400 case 's': proto = &prproto[PR_SHORT]; s++; break;
401 case 'm': proto = &prproto[PR_MEDIUM]; s++; break;
402 case 'M': proto = &prproto[PR_LONG]; s++; break;
403 case '=': proto = &eqproto; s++; break;
404 case 'h': proto = &hproto; s++; break;
405 case 'w': proto = &wproto; s++; break;
406 default: proto = &prproto[PR_SHORT]; break;
412 parg.p_string = prproto[pr_type];
419 * Handler for the -b option.
432 * Set the new number of buffers.
434 ch_setbufspace(bufspace);
442 * Handler for the -i option.
462 * Handler for the -V option.
478 * Force output to stdout per GNU standard for --version output.
487 #if HAVE_POSIX_REGCOMP
500 putstr("Spencer V8 ");
502 #if !HAVE_GNU_REGEX && !HAVE_POSIX_REGCOMP && !HAVE_PCRE && !HAVE_RE_COMP && !HAVE_REGCMP && !HAVE_V8_REGCOMP
505 putstr("regular expressions)\n");
506 putstr("Copyright (C) 1984-2012 Mark Nudelman\n\n");
507 putstr("less comes with NO WARRANTY, to the extent permitted by law.\n");
508 putstr("For information about the terms of redistribution,\n");
509 putstr("see the file named README in the less distribution.\n");
510 putstr("Homepage: http://www.greenwoodsoftware.com/less\n");
518 * Parse an MSDOS color descriptor.
521 colordesc(s, fg_color, bg_color)
529 fg = getnum(&s, "D", &err);
532 error("Missing fg color in -D", NULL_PARG);
540 bg = getnum(&s, "D", &err);
543 error("Missing bg color in -D", NULL_PARG);
548 error("Extra characters at end of -D option", NULL_PARG);
554 * Handler for the -D option.
569 colordesc(s, &nm_fg_color, &nm_bg_color);
572 colordesc(s, &bo_fg_color, &bo_bg_color);
575 colordesc(s, &ul_fg_color, &ul_bg_color);
578 colordesc(s, &bl_fg_color, &bl_bg_color);
581 colordesc(s, &so_fg_color, &so_bg_color);
584 error("-D must be followed by n, d, u, k or s", NULL_PARG);
589 at_enter(AT_STANDOUT);
600 * Handler for the -x option.
607 extern int tabstops[];
608 extern int ntabstops;
609 extern int tabdefault;
610 char msg[60+(4*TABSTOP_MAX)];
618 /* Start at 1 because tabstops[0] is always zero. */
619 for (i = 1; i < TABSTOP_MAX; )
623 while (*s >= '0' && *s <= '9')
624 n = (10 * n) + (*s++ - '0');
625 if (n > tabstops[i-1])
634 tabdefault = tabstops[ntabstops-1] - tabstops[ntabstops-2];
637 strcpy(msg, "Tab stops ");
640 for (i = 1; i < ntabstops; i++)
644 sprintf(msg+strlen(msg), "%d", tabstops[i]);
646 sprintf(msg+strlen(msg), " and then ");
648 sprintf(msg+strlen(msg), "every %d spaces",
658 * Handler for the -" option.
674 openquote = closequote = '\0';
677 if (s[1] != '\0' && s[2] != '\0')
679 error("-\" must be followed by 1 or 2 chars", NULL_PARG);
684 closequote = openquote;
693 error("quotes %s", &parg);
699 * "-?" means display a help message.
700 * If from the command line, exit immediately.
712 error("Use \"h\" for help", NULL_PARG);
720 * Get the "screen window" size.
727 return (sc_height + swindow);