105 lines
3.5 KiB
C
105 lines
3.5 KiB
C
/*
|
|
* Copyright (c) 1987, 1993, 1994
|
|
* The 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.
|
|
*/
|
|
|
|
#include <string.h>
|
|
#include <stdio.h>
|
|
|
|
int opterr = 1, /* if error message should be printed */
|
|
optind = 1, /* index into parent argv vector */
|
|
optopt, /* character checked for validity */
|
|
optreset; /* reset getopt */
|
|
char *optarg; /* argument associated with option */
|
|
|
|
#define BADCH (int)'?'
|
|
#define BADARG (int)':'
|
|
#define EMSG ""
|
|
|
|
/*
|
|
* getopt --
|
|
* Parse argc/argv argument vector.
|
|
*/
|
|
int
|
|
getopt(int nargc, char * const nargv[], const char *ostr)
|
|
{
|
|
static char *place = EMSG; /* option letter processing */
|
|
char *oli; /* option letter list index */
|
|
|
|
if (optreset || !*place) { /* update scanning pointer */
|
|
optreset = 0;
|
|
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 != ':')
|
|
(void)printf("illegal option -- %c\n", 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 (*ostr == ':')
|
|
return (BADARG);
|
|
if (opterr)
|
|
(void)printf("option requires an argument -- %c\n", optopt);
|
|
return (BADCH);
|
|
}
|
|
else /* white space */
|
|
optarg = nargv[optind];
|
|
place = EMSG;
|
|
++optind;
|
|
}
|
|
return (optopt); /* dump back option letter */
|
|
}
|