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/*
Newsgroups: mod.std.unix
Subject: public domain AT&T getopt source
Date: 3 Nov 85 19:34:15 GMT
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.
*/
#include "getopt.h"
/*LINTLIBRARY*/
namespace CG3_GetOpt {
#define EOF (-1)
#define ERR(s, c) if (opterr){\
char errbuf[2]{c, '\n'};\
(void) fwrite(argv[0], (unsigned)strlen(argv[0]), 1, stderr);\
(void) fwrite(s, (unsigned)strlen(s), 1, stderr);\
(void) fwrite(errbuf, 2, 1, stderr);}
int opterr = 1;
int optind = 1;
int optopt;
char *optarg;
int getopt(int argc, char **argv, const char *opts) {
static thread_local int sp = 1;
int c;
const char *cp;
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=strchr(opts, c)) == 0) {
ERR(": illegal option -- ", (char)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 -- ", (char)c);
sp = 1;
return('?');
}
else {
optarg = argv[optind++];
}
sp = 1;
}
else {
if (argv[optind][++sp] == '\0') {
sp = 1;
optind++;
}
optarg = nullptr;
}
return(c);
}
}
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