c5ff256532
argument is a colon. Updated the manpage to reflect the above change, and expanded the example to the one used by the POSIX.2 rationale, as it more clearly explains how the new behavior is to be used. The manpage should be rewritten --- it is much more confusing than it should be.
125 lines
3.9 KiB
C
125 lines
3.9 KiB
C
/*
|
|
* Copyright (c) 1987 Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* 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. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. 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.
|
|
*/
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
/*static char *sccsid = "from: @(#)getopt.c 4.13 (Berkeley) 2/23/91";*/
|
|
static char *rcsid = "$Id: getopt.c,v 1.5 1993/10/12 21:52:45 jtc Exp $";
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
/*
|
|
* get option letter from argument vector
|
|
*/
|
|
int opterr = 1; /* if error message should be printed */
|
|
int optind = 1; /* index into parent argv vector */
|
|
int optopt; /* character checked for validity */
|
|
char *optarg; /* argument associated with option */
|
|
|
|
#define NOOPT (int)':' /* No option */
|
|
#define BADCH (int)'?'
|
|
#define EMSG ""
|
|
|
|
int
|
|
getopt(nargc, nargv, ostr)
|
|
int nargc;
|
|
char * const *nargv;
|
|
const char *ostr;
|
|
{
|
|
static char *place = EMSG; /* option letter processing */
|
|
register char *oli; /* option letter list index */
|
|
char *p;
|
|
|
|
if (!*place) { /* update scanning pointer */
|
|
if (optind >= nargc || *(place = nargv[optind]) != '-') {
|
|
place = EMSG;
|
|
return(-1);
|
|
}
|
|
if (place[1] && *++place == '-') { /* found "--" */
|
|
++optind;
|
|
place = EMSG;
|
|
return(-1);
|
|
}
|
|
}
|
|
/* option letter okay? */
|
|
if ((optopt = (int)*place++) == (int)':' ||
|
|
!(oli = strchr(ostr, optopt))) {
|
|
/*
|
|
* if the user didn't specify '-' as an option,
|
|
* assume it means -1.
|
|
*/
|
|
if (optopt == (int)'-')
|
|
return(-1);
|
|
if (!*place)
|
|
++optind;
|
|
if (opterr && *ostr != ':') {
|
|
if (!(p = strrchr(*nargv, '/')))
|
|
p = *nargv;
|
|
else
|
|
++p;
|
|
(void)fprintf(stderr, "%s: illegal option -- %c\n",
|
|
p, optopt);
|
|
}
|
|
return(BADCH);
|
|
}
|
|
|
|
if (*++oli != ':') { /* don't need argument */
|
|
optarg = NULL;
|
|
if (!*place)
|
|
++optind;
|
|
} else { /* need an argument */
|
|
if (*place) /* no white space */
|
|
optarg = place;
|
|
else if (nargc <= ++optind) { /* no arg */
|
|
place = EMSG;
|
|
if (opterr && *ostr != ':') {
|
|
if (!(p = strrchr(*nargv, '/')))
|
|
p = *nargv;
|
|
else
|
|
++p;
|
|
(void)fprintf(stderr,
|
|
"%s: option requires an argument -- %c\n",
|
|
p, optopt);
|
|
}
|
|
return((*ostr == ':') ? NOOPT : BADCH);
|
|
}
|
|
else /* white space */
|
|
optarg = nargv[optind];
|
|
place = EMSG;
|
|
++optind;
|
|
}
|
|
return(optopt); /* dump back option letter */
|
|
}
|