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/* $OpenBSD: egetopt.c,v 1.9 2013/11/26 13:19:07 deraadt Exp $ */
/*-
* Copyright (c) 1991 Keith Muller.
* Copyright (c) 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Keith Muller of the University of California, San Diego.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "extern.h"
/*
* egetopt: get option letter from argument vector (an extended
* version of getopt).
*
* Non standard additions to the ostr specs are:
* 1) '?': immediate value following arg is optional (no white space
* between the arg and the value)
* 2) '#': +/- followed by a number (with an optional sign but
* no white space between the arg and the number). The - may be
* combined with other options, but the + cannot.
*/
int eopterr = 1; /* if error message should be printed */
int eoptind = 1; /* index into parent argv vector */
int eoptopt; /* character checked for validity */
char *eoptarg; /* argument associated with option */
#define BADCH (int)'?'
#define EMSG ""
int
egetopt(int nargc, char * const *nargv, const char *ostr)
{
static char *place = EMSG; /* option letter processing */
char *oli; /* option letter list index */
static int delim; /* which option delimiter */
char *p;
static char savec = '\0';
if (savec != '\0') {
*place = savec;
savec = '\0';
}
if (!*place) {
/*
* update scanning pointer
*/
if ((eoptind >= nargc) ||
((*(place = nargv[eoptind]) != '-') && (*place != '+'))) {
place = EMSG;
return (-1);
}
delim = (int)*place;
if (place[1] && *++place == '-' && !place[1]) {
/*
* found "--"
*/
++eoptind;
place = EMSG;
return (-1);
}
}
/*
* check option letter
*/
if ((eoptopt = (int)*place++) == (int)':' || (eoptopt == (int)'?') ||
!(oli = strchr(ostr, eoptopt))) {
/*
* if the user didn't specify '-' as an option,
* assume it means EOF when by itself.
*/
if ((eoptopt == (int)'-') && !*place)
return (-1);
if (strchr(ostr, '#') && (isdigit((unsigned char)eoptopt) ||
(((eoptopt == (int)'-') || (eoptopt == (int)'+')) &&
isdigit((unsigned char)*place)))) {
/*
* # option: +/- with a number is ok
*/
for (p = place; *p != '\0'; ++p) {
if (!isdigit((unsigned char)*p))
break;
}
eoptarg = place-1;
if (*p == '\0') {
place = EMSG;
++eoptind;
} else {
place = p;
savec = *p;
*place = '\0';
}
return (delim);
}
if (!*place)
++eoptind;
if (eopterr) {
if (!(p = strrchr(*nargv, '/')))
p = *nargv;
else
++p;
(void)fprintf(stderr, "%s: illegal option -- %c\n",
p, eoptopt);
}
return (BADCH);
}
if (delim == (int)'+') {
/*
* '+' is only allowed with numbers
*/
if (!*place)
++eoptind;
if (eopterr) {
if (!(p = strrchr(*nargv, '/')))
p = *nargv;
else
++p;
(void)fprintf(stderr,
"%s: illegal '+' delimiter with option -- %c\n",
p, eoptopt);
}
return (BADCH);
}
++oli;
if ((*oli != ':') && (*oli != '?')) {
/*
* don't need argument
*/
eoptarg = NULL;
if (!*place)
++eoptind;
return (eoptopt);
}
if (*place) {
/*
* no white space
*/
eoptarg = place;
} else if (*oli == '?') {
/*
* no arg, but NOT required
*/
eoptarg = NULL;
} else if (nargc <= ++eoptind) {
/*
* no arg, but IS required
*/
place = EMSG;
if (eopterr) {
if (!(p = strrchr(*nargv, '/')))
p = *nargv;
else
++p;
(void)fprintf(stderr,
"%s: option requires an argument -- %c\n", p,
eoptopt);
}
return (BADCH);
} else {
/*
* arg has white space
*/
eoptarg = nargv[eoptind];
}
place = EMSG;
++eoptind;
return (eoptopt);
}
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