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/*
** @(#)getopt.c 2.5 (smail) 9/15/87
*/
/*
* This is the AT&T public domain source for getopt(3). It is the code
* which was given out at the 1985 UNIFORUM conference in Dallas.
*
* 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. The current SVR2 man page
* reflects the actual behavor of this getopt.
*/
#include <string.h>
#include <stdio.h>
#include "getopt.h"
/*LINTLIBRARY*/
#ifndef NULL
#define NULL 0
#endif
#define EOF (-1)
#define ERR(str, chr) (opterr ? fprintf(stderr, "%s%s%c\n", argv[0], str, chr) : 0)
int opterr = 1;
int optind = 1;
int optopt = 0;
char *optarg = 0;
int
getopt(int argc, char **argv, char *opts)
{
static int sp = 1;
register int c;
register char *cp;
if(sp == 1) {
if(optind >= argc || (argv[optind][0] != '+' &&
argv[optind][0] != '-') || argv[optind][1] == '\0')
return(EOF);
else if(strcmp(argv[optind], "--") == 0) {
optind++;
return(EOF);
}
/* '+' for config options, '+' should not be in the opts list */
if (argv[optind][0] == '+') {
optarg = argv[optind++] + 1;
return '+';
}
}
optopt = c = argv[optind][sp];
if(c == ':' || (cp=strchr(opts, c)) == NULL) {
ERR(": illegal option -- ", c);
if(argv[optind][++sp] == '\0') {
optind++;
sp = 1;
}
return('\0');
}
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('\0');
} else
optarg = argv[optind++];
sp = 1;
} else {
if(argv[optind][++sp] == '\0') {
sp = 1;
optind++;
}
optarg = NULL;
}
return(c);
}
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