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getopt.c
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C/C++ Source or Header
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1993-10-07
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3KB
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104 lines
/*
* Copyright (c) 1987 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that: (1) source distributions retain this entire copyright
* notice and comment, and (2) distributions including binaries display
* the following acknowledgement: ``This product includes software
* developed by the University of California, Berkeley and its contributors''
* in the documentation or other materials provided with the distribution
* and in all advertising materials mentioning features or use of this
* software. 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)getopt.c 4.12 (Berkeley) 6/1/90";
#endif /* LIBC_SCCS and not lint */
#include <stdio.h>
#include <string.h>
/*
* get option letter from argument vector
*/
int opterr = 1, /* if error message should be printed */
optind = 1, /* index into parent argv vector */
optopt; /* character checked for validity */
char *optarg; /* argument associated with option */
#define BADCH (int)'?'
#define EMSG ""
getopt(nargc, nargv, ostr)
int nargc;
char **nargv, *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(EOF);
}
if (place[1] && *++place == '-') { /* found "--" */
++optind;
place = EMSG;
return(EOF);
}
} /* option letter okay? */
if ((optopt = (int)*place++) == (int)':' ||
!(oli = index(ostr, optopt))) {
/*
* if the user didn't specify '-' as an option,
* assume it means EOF.
*/
if (optopt == (int)'-')
return(EOF);
if (!*place)
++optind;
if (opterr) {
if (!(p = rindex(*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 (!(p = rindex(*nargv, '/')))
p = *nargv;
else
++p;
if (opterr)
(void)fprintf(stderr,
"%s: option requires an argument -- %c\n",
p, optopt);
return(BADCH);
}
else /* white space */
optarg = nargv[optind];
place = EMSG;
++optind;
}
return(optopt); /* dump back option letter */
}