a5f0fb151d
distributed under your choice of the GPL or a BSD style license. Reviewed by: peter Obtained from: http://home.flash.net/~marknu/less/
611 lines
12 KiB
C
611 lines
12 KiB
C
/*
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* Copyright (C) 1984-2000 Mark Nudelman
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*
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* You may distribute under the terms of either the GNU General Public
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* License or the Less License, as specified in the README file.
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*
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* For more information about less, or for information on how to
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* contact the author, see the README file.
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*/
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/*
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* Process command line options.
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*
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* Each option is a single letter which controls a program variable.
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* The options have defaults which may be changed via
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* the command line option, toggled via the "-" command,
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* or queried via the "_" command.
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*/
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#include "less.h"
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#include "option.h"
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static struct option *pendopt;
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public int plusoption = FALSE;
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static char *propt();
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static char *optstring();
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static int flip_triple();
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extern int screen_trashed;
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extern char *every_first_cmd;
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/*
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* Scan an argument (either from the command line or from the
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* LESS environment variable) and process it.
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*/
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public void
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scan_option(s)
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char *s;
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{
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register struct option *o;
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register int optc;
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char *optname;
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char *printopt;
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char *str;
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int set_default;
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int lc;
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int err;
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PARG parg;
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if (s == NULL)
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return;
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/*
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* If we have a pending option which requires an argument,
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* handle it now.
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* This happens if the previous option was, for example, "-P"
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* without a following string. In that case, the current
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* option is simply the argument for the previous option.
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*/
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if (pendopt != NULL)
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{
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switch (pendopt->otype & OTYPE)
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{
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case STRING:
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(*pendopt->ofunc)(INIT, s);
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break;
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case NUMBER:
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printopt = propt(pendopt->oletter);
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*(pendopt->ovar) = getnum(&s, printopt, (int*)NULL);
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break;
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}
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pendopt = NULL;
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return;
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}
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set_default = FALSE;
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optname = NULL;
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while (*s != '\0')
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{
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/*
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* Check some special cases first.
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*/
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switch (optc = *s++)
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{
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case ' ':
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case '\t':
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case END_OPTION_STRING:
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continue;
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case '-':
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/*
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* "--" indicates an option name instead of a letter.
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*/
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if (*s == '-')
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{
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optname = ++s;
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break;
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}
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/*
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* "-+" means set these options back to their defaults.
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* (They may have been set otherwise by previous
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* options.)
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*/
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set_default = (*s == '+');
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if (set_default)
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s++;
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continue;
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case '+':
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/*
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* An option prefixed by a "+" is ungotten, so
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* that it is interpreted as less commands
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* processed at the start of the first input file.
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* "++" means process the commands at the start of
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* EVERY input file.
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*/
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plusoption = TRUE;
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if (*s == '+')
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every_first_cmd = save(++s);
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else
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ungetsc(s);
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s = optstring(s, propt('+'));
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continue;
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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/*
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* Special "more" compatibility form "-<number>"
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* instead of -z<number> to set the scrolling
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* window size.
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*/
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s--;
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optc = 'z';
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break;
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}
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/*
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* Not a special case.
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* Look up the option letter in the option table.
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*/
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err = 0;
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if (optname == NULL)
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{
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printopt = propt(optc);
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lc = SIMPLE_IS_LOWER(optc);
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o = findopt(optc);
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} else
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{
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printopt = optname;
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lc = SIMPLE_IS_LOWER(optname[0]);
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o = findopt_name(&optname, NULL, &err);
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s = optname;
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optname = NULL;
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if (*s == '\0' || *s == ' ')
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{
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/*
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* The option name matches exactly.
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*/
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;
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} else if (*s == '=')
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{
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/*
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* The option name is followed by "=value".
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*/
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if (o != NULL &&
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(o->otype & OTYPE) != STRING &&
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(o->otype & OTYPE) != NUMBER)
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{
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parg.p_string = printopt;
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error("The %s option should not be followed by =",
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&parg);
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quit(QUIT_ERROR);
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}
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s++;
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} else
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{
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/*
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* The specified name is longer than the
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* real option name.
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*/
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o = NULL;
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}
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}
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if (o == NULL)
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{
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parg.p_string = printopt;
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if (err == OPT_AMBIG)
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error("%s is an ambiguous abbreviation (\"less --help\" for help)",
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&parg);
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else
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error("There is no %s option (\"less --help\" for help)",
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&parg);
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quit(QUIT_ERROR);
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}
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str = NULL;
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switch (o->otype & OTYPE)
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{
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case BOOL:
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if (set_default)
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*(o->ovar) = o->odefault;
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else
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*(o->ovar) = ! o->odefault;
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break;
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case TRIPLE:
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if (set_default)
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*(o->ovar) = o->odefault;
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else
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*(o->ovar) = flip_triple(o->odefault, lc);
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break;
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case STRING:
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if (*s == '\0')
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{
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/*
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* Set pendopt and return.
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* We will get the string next time
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* scan_option is called.
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*/
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pendopt = o;
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return;
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}
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/*
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* Don't do anything here.
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* All processing of STRING options is done by
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* the handling function.
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*/
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str = s;
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s = optstring(s, printopt);
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break;
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case NUMBER:
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if (*s == '\0')
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{
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pendopt = o;
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return;
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}
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*(o->ovar) = getnum(&s, printopt, (int*)NULL);
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break;
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}
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/*
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* If the option has a handling function, call it.
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*/
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if (o->ofunc != NULL)
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(*o->ofunc)(INIT, str);
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}
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}
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/*
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* Toggle command line flags from within the program.
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* Used by the "-" and "_" commands.
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* how_toggle may be:
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* OPT_NO_TOGGLE just report the current setting, without changing it.
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* OPT_TOGGLE invert the current setting
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* OPT_UNSET set to the default value
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* OPT_SET set to the inverse of the default value
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*/
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public void
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toggle_option(c, s, how_toggle)
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int c;
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char *s;
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int how_toggle;
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{
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register struct option *o;
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register int num;
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int no_prompt;
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int err;
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PARG parg;
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no_prompt = (how_toggle & OPT_NO_PROMPT);
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how_toggle &= ~OPT_NO_PROMPT;
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/*
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* Look up the option letter in the option table.
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*/
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o = findopt(c);
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if (o == NULL)
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{
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parg.p_string = propt(c);
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error("There is no %s option", &parg);
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return;
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}
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if (how_toggle == OPT_TOGGLE && (o->otype & NO_TOGGLE))
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{
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parg.p_string = propt(c);
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error("Cannot change the %s option", &parg);
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return;
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}
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if (how_toggle == OPT_NO_TOGGLE && (o->otype & NO_QUERY))
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{
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parg.p_string = propt(c);
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error("Cannot query the %s option", &parg);
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return;
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}
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/*
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* Check for something which appears to be a do_toggle
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* (because the "-" command was used), but really is not.
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* This could be a string option with no string, or
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* a number option with no number.
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*/
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switch (o->otype & OTYPE)
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{
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case STRING:
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case NUMBER:
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if (how_toggle == OPT_TOGGLE && *s == '\0')
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how_toggle = OPT_NO_TOGGLE;
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break;
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}
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#if HILITE_SEARCH
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if (how_toggle != OPT_NO_TOGGLE && (o->otype & HL_REPAINT))
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repaint_hilite(0);
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#endif
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/*
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* Now actually toggle (change) the variable.
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*/
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if (how_toggle != OPT_NO_TOGGLE)
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{
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switch (o->otype & OTYPE)
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{
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case BOOL:
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/*
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* Boolean.
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*/
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switch (how_toggle)
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{
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case OPT_TOGGLE:
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*(o->ovar) = ! *(o->ovar);
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break;
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case OPT_UNSET:
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*(o->ovar) = o->odefault;
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break;
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case OPT_SET:
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*(o->ovar) = ! o->odefault;
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break;
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}
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break;
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case TRIPLE:
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/*
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* Triple:
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* If user gave the lower case letter, then switch
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* to 1 unless already 1, in which case make it 0.
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* If user gave the upper case letter, then switch
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* to 2 unless already 2, in which case make it 0.
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*/
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switch (how_toggle)
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{
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case OPT_TOGGLE:
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*(o->ovar) = flip_triple(*(o->ovar),
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islower(c));
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break;
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case OPT_UNSET:
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*(o->ovar) = o->odefault;
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break;
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case OPT_SET:
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*(o->ovar) = flip_triple(o->odefault,
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islower(c));
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break;
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}
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break;
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case STRING:
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/*
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* String: don't do anything here.
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* The handling function will do everything.
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*/
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switch (how_toggle)
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{
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case OPT_SET:
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case OPT_UNSET:
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error("Cannot use \"-+\" or \"--\" for a string option",
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NULL_PARG);
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return;
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}
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break;
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case NUMBER:
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/*
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* Number: set the variable to the given number.
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*/
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switch (how_toggle)
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{
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case OPT_TOGGLE:
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num = getnum(&s, '\0', &err);
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if (!err)
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*(o->ovar) = num;
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break;
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case OPT_UNSET:
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*(o->ovar) = o->odefault;
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break;
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case OPT_SET:
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error("Can't use \"-!\" for a numeric option",
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NULL_PARG);
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return;
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}
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break;
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}
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}
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/*
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* Call the handling function for any special action
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* specific to this option.
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*/
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if (o->ofunc != NULL)
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(*o->ofunc)((how_toggle==OPT_NO_TOGGLE) ? QUERY : TOGGLE, s);
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#if HILITE_SEARCH
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if (how_toggle != OPT_NO_TOGGLE && (o->otype & HL_REPAINT))
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chg_hilite();
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#endif
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if (!no_prompt)
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{
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/*
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* Print a message describing the new setting.
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*/
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switch (o->otype & OTYPE)
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{
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case BOOL:
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case TRIPLE:
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/*
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* Print the odesc message.
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*/
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error(o->odesc[*(o->ovar)], NULL_PARG);
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break;
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case NUMBER:
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/*
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* The message is in odesc[1] and has a %d for
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* the value of the variable.
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*/
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parg.p_int = *(o->ovar);
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error(o->odesc[1], &parg);
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break;
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case STRING:
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/*
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* Message was already printed by the handling function.
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*/
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break;
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}
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}
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if (how_toggle != OPT_NO_TOGGLE && (o->otype & REPAINT))
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screen_trashed = TRUE;
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}
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/*
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* "Toggle" a triple-valued option.
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*/
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static int
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flip_triple(val, lc)
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int val;
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int lc;
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{
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if (lc)
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return ((val == OPT_ON) ? OPT_OFF : OPT_ON);
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else
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return ((val == OPT_ONPLUS) ? OPT_OFF : OPT_ONPLUS);
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}
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/*
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* Return a string suitable for printing as the "name" of an option.
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* For example, if the option letter is 'x', just return "-x".
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*/
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static char *
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propt(c)
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int c;
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{
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static char buf[8];
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sprintf(buf, "-%s", prchar(c));
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return (buf);
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}
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/*
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* Determine if an option is a single character option (BOOL or TRIPLE),
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* or if it a multi-character option (NUMBER).
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*/
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public int
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single_char_option(c)
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int c;
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{
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register struct option *o;
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o = findopt(c);
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if (o == NULL)
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return (TRUE);
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return ((o->otype & (BOOL|TRIPLE|NOVAR|NO_TOGGLE)) != 0);
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}
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/*
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* Return the prompt to be used for a given option letter.
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* Only string and number valued options have prompts.
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*/
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public char *
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opt_prompt(c)
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int c;
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{
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register struct option *o;
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o = findopt(c);
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if (o == NULL || (o->otype & (STRING|NUMBER)) == 0)
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return (NULL);
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return (o->odesc[0]);
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}
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/*
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* Return whether or not there is a string option pending;
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* that is, if the previous option was a string-valued option letter
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* (like -P) without a following string.
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* In that case, the current option is taken to be the string for
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* the previous option.
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*/
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public int
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isoptpending()
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{
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return (pendopt != NULL);
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}
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/*
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* Print error message about missing string.
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*/
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static void
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nostring(printopt)
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char *printopt;
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{
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PARG parg;
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parg.p_string = printopt;
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error("Value is required after %s", &parg);
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}
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/*
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* Print error message if a STRING type option is not followed by a string.
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*/
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public void
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nopendopt()
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{
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nostring(propt(pendopt->oletter));
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}
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/*
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* Scan to end of string or to an END_OPTION_STRING character.
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* In the latter case, replace the char with a null char.
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* Return a pointer to the remainder of the string, if any.
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*/
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static char *
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optstring(s, printopt)
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char *s;
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char *printopt;
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{
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register char *p;
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if (*s == '\0')
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{
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nostring(printopt);
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quit(QUIT_ERROR);
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}
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for (p = s; *p != '\0'; p++)
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if (*p == END_OPTION_STRING)
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{
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*p = '\0';
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return (p+1);
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}
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return (p);
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}
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/*
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* Translate a string into a number.
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* Like atoi(), but takes a pointer to a char *, and updates
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* the char * to point after the translated number.
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*/
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public int
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getnum(sp, printopt, errp)
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char **sp;
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char *printopt;
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int *errp;
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{
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register char *s;
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register int n;
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register int neg;
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PARG parg;
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s = skipsp(*sp);
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neg = FALSE;
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if (*s == '-')
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{
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neg = TRUE;
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s++;
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}
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if (*s < '0' || *s > '9')
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{
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if (errp != NULL)
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{
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*errp = TRUE;
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return (-1);
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}
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parg.p_string = printopt;
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error("Number is required after %s", &parg);
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quit(QUIT_ERROR);
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}
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n = 0;
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while (*s >= '0' && *s <= '9')
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n = 10 * n + *s++ - '0';
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*sp = s;
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if (errp != NULL)
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*errp = FALSE;
|
|
if (neg)
|
|
n = -n;
|
|
return (n);
|
|
}
|