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/*
* Public Domain getopt - history below
*
* $Id: getopt.c,v 1.4 2003/02/19 11:32:58 cmdjb Exp $
*
*/
/*
* From: gwyn@brl-tgr.ARPA (Doug Gwyn <gwyn>) Newsgroups: net.sources
* Subject: getopt library routine Date: 30 Mar 85 04:45:33 GMT
*/
/*
* getopt -- public domain version of standard System V routine
*
* Strictly enforces the System V Command Syntax Standard; provided by D A
* Gwyn of BRL for generic ANSI C implementations
*
* #define STRICT to prevent acceptance of clustered options with arguments
* and ommision of whitespace between option and arg.
*/
/*
* Modified by Manuel Novoa III on 1/5/01 to use weak symbols.
* Programs needing long options will link gnu_getopt instead.
*/
/*
* Last public domain version 1.5 downloaded from uclibc CVS:
* http://www.uclibc.org/cgi-bin/cvsweb/uClibc/libc/unistd/getopt.c
* on 2003-02-18 by Dave Beckett and tidied:
* Ran through "indent getopt.c -gnu" then fixed up the mess
* Removed register - compilers are smart these days
* ANSI-fied the declarations
* Prefixed with raptor_ so that it doesn't clash with any getopt
* linked in later.
*/
#include <stdio.h>
#include <string.h>
#include <raptor_getopt.h>
int opterr; /* error => print message */
int optind; /* next argv[] index */
int optopt; /* Set for unknown arguments */
char *optarg; /* option parameter if any */
/*
* Err:
* program name argv[0]
* specific message
* defective option letter
*/
static int
Err (char *name, char *mess, int c) /* returns '?' */
{
optopt = c;
if (opterr)
{
(void) fprintf (stderr, "%s: %s -- %c\n", name, mess, c);
}
return '?'; /* erroneous-option marker */
}
int
getopt (int argc, char * const argv[], const char *optstring)
{
static int sp = 1; /* position within argument */
int osp; /* saved `sp' for param test */
#ifndef STRICT
int oind; /* saved `optind' for param test */
#endif
int c; /* option letter */
char *cp; /* -> option in `optstring' */
optarg = NULL;
/* initialise getopt vars */
if (optind == 0)
{
optind = 1;
opterr = 1;
optopt = 1;
optarg = NULL;
}
if (sp == 1)
{ /* fresh argument */
if (optind >= argc /* no more arguments */
|| argv[optind][0] != '-' /* no more options */
|| argv[optind][1] == '\0' /* not option; stdin */
)
return EOF;
else if (strcmp (argv[optind], "--") == 0)
{
++optind; /* skip over "--" */
return EOF; /* "--" marks end of options */
}
}
c = argv[optind][sp]; /* option letter */
osp = sp++; /* get ready for next letter */
#ifndef STRICT
oind = optind; /* save optind for param test */
#endif
if (argv[optind][sp] == '\0')
{ /* end of argument */
++optind; /* get ready for next try */
sp = 1; /* beginning of next argument */
}
if (c == ':'
|| c == '?' /* optstring syntax conflict */
|| (cp = strchr (optstring, c)) == NULL) /* not found */
{
return Err (argv[0], "illegal option", c);
}
if (cp[1] == ':')
{ /* option takes parameter */
#ifdef STRICT
if (osp != 1)
{
return Err (argv[0], "option must not be clustered", c);
}
/* reset by end of argument */
if (sp != 1)
{
return Err (argv[0], "option must be followed by white space", c);
}
#else
if (oind == optind)
{ /* argument w/o whitespace */
optarg = &argv[optind][sp];
sp = 1; /* beginning of next argument */
}
else
#endif
if (optind >= argc)
{
return Err (argv[0], "option requires an argument", c);
}
else /* argument w/ whitespace */
optarg = argv[optind];
++optind; /* skip over parameter */
}
return c;
}
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