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getopt.c,v
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1994-01-11
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3KB
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131 lines
head 1.2;
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jasegler:1.2; strict;
comment @ * @;
1.2
date 94.01.11.19.51.38; author jasegler; state Exp;
branches;
next 1.1;
1.1
date 94.01.11.19.04.47; author jasegler; state Exp;
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@@
1.2
log
@*** empty log message ***
@
text
@/*
** @@(#)getopt.c 2.5 (smail) 9/15/87
*/
/*
* 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.
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
/*LINTLIBRARY */
#define EOF (-1)
#define ERR(s, c)\
if(opterr) { fprintf(stderr, "%s%s%lc\n", argv[0], s, c); }
int opterr = 1;
int optind = 1;
int optopt;
char *optarg;
int
getopt (int argc, char *const *argv, const char *opts)
{
static int sp = 1;
register long 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], "--") == NULL)
{
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);
}
@
1.1
log
@Initial revision
@
text
@d43 1
a43 1
register int c;
@