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GETOPT.C
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1993-08-04
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/*
** @(#)getopt.c 2.2 (smail) 1/26/87
*/
/*
* 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.
*
* 90-09-25 Dan Fandrich <shad04@ccu.umanitoba.ca>
* Modified for MSDOS under Turbo C ver 2.0
* - supports both / and \ as path name separators in ERR()
* - lowercases program name in ERR()
* - eliminates filename extension in program name in ERR()
*/
#ifdef BSD
#include <strings.h>
#else
#include <string.h>
#endif
#include <ctype.h> /* for tolower() */
#if defined(__MSDOS__) || defined(__OS2__)
#define index strchr
#include <io.h>
#endif
#include "getopt.h"
/*LINTLIBRARY*/
#ifndef NULL
#define NULL ((void *)0)
#endif
#define EOF (-1)
#define ERR(s, c) if(opterr){\
extern int write();\
char errbuf[2];\
char *pn,*pp;\
for (pp = pn = argv[0]; (*pp=tolower(*pp)) != 0; pp++)\
if ((*pp == '/') || (*pp == '\\')) /* dtf: supports Unix and */\
pn = pp + 1; /* MSDOS path names */\
else if (*pp == '.')\
*pp = '\0';\
errbuf[0] = c; errbuf[1] = '\n';\
(void) write(2, pn, (unsigned)strlen(pn));\
(void) write(2, s, (unsigned)strlen(s));\
(void) write(2, errbuf, 2);}
extern char *index();
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(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);
}