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getopt.c
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C/C++ Source or Header
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1993-08-30
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3KB
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102 lines
/* ::[[ @(#) getopt.c 1.5 89/03/11 05:40:23 ]]:: */
#ifndef LINT
static char sccsid[]="::[[ @(#) getopt.c 1.5 89/03/11 05:40:23 ]]::";
#endif
/*
Checksum: 1099544938 (check or update this with "brik")
*/
/*
* Here's something you've all been waiting for: the AT&T public domain
* source for getopt(3). It is the code which was given out at the 1985
* UNIFORUM conference in Dallas. I obtained it by electronic mail
* directly from AT&T. The people there assure me that it is indeed
* in the public domain.
*
* There is no manual page. That is because the one they gave out at
* UNIFORUM was slightly different from the current System V Release 2
* manual page. The difference apparently involved a note about the
* famous rules 5 and 6, recommending using white space between an option
* and its first argument, and not grouping options that have arguments.
* Getopt itself is currently lenient about both of these things White
* space is allowed, but not mandatory, and the last option in a group can
* have an argument. That particular version of the man page evidently
* has no official existence, and my source at AT&T did not send a copy.
* The current SVR2 man page reflects the actual behavor of this getopt.
* However, I am not about to post a copy of anything licensed by AT&T.
*/
/*
Minor modifications by Rahul Dhesi 1989/03/06
*/
#include "brik.h"
#ifdef ANSIPROTO
int strcmp (char *, char *);
char *strchr (char *, char);
#endif
#include <stdio.h>
/* Avoid possible compiler warning if we simply redefine NULL or EOF */
#define XNULL 0
#define XEOF (-1)
#define ERR(szz,czz) if(opterr){fprintf(stderr,"%s%s%c\n",argv[0],szz,czz);}
extern int strcmp();
extern char *strchr();
int opterr = 1;
int optind = 1;
int optopt;
char *optarg;
int
getopt(argc, argv, opts)
int argc;
char **argv, *opts;
{
static int sp = 1;
register int c;
register char *cp;
if(sp == 1)
if(optind >= argc ||
argv[optind][0] != '-' || argv[optind][1] == '\0')
return(XEOF);
else if(strcmp(argv[optind], "--") == XNULL) {
optind++;
return(XEOF);
}
optopt = c = argv[optind][sp];
if(c == ':' || (cp=strchr(opts, c)) == XNULL) {
ERR(": illegal option -- ", c);
if(argv[optind][++sp] == '\0') {
optind++;
sp = 1;
}
return('?');
}
if(*++cp == ':') {
if(argv[optind][sp+1] != '\0')
optarg = &argv[optind++][sp+1];
else if(++optind >= argc) {
ERR(": option requires an argument -- ", c);
sp = 1;
return('?');
} else
optarg = argv[optind++];
sp = 1;
} else {
if(argv[optind][++sp] == '\0') {
sp = 1;
optind++;
}
optarg = XNULL;
}
return(c);
}