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getopt.c
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C/C++ Source or Header
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1994-06-05
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3KB
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90 lines
//
// 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.
//
// -- Andrew Derbyshire
//
#include <stdio.h>
#include <string.h>
#define index strchr
#include "getopt.h"
#define ERR(s,c) fprintf(stderr,"%s%s%c\n", argv[0],s,c)
//
// Globals used by the caller
//
int optind = 1;
int optopt;
char *optarg;
int getopts(int argc, char **argv, char *opts)
{
static int sp = 1;
register int c;
register char *cp;
if (optind < argc && argv[optind][0] == '-' && argv[optind][1] == '\0')
if((cp=index(opts, '-')) != NULL) {
optind++;
return('-');
} else {
optind++;
return('?');
}
if(sp == 1)
if(optind >= argc || argv[optind][0] != '-' || argv[optind][1] == '\0')
return(EOF);
else if(strcmp(argv[optind], "--") == 0) {
optind++;
return(EOF);
}
optopt = c = argv[optind][sp];
if(c == ':' || (cp=index(opts, c)) == NULL) {
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 = NULL;
}
return(c);
}