Return to getopt_long.c CVS log

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Fix several end cases:

o If a long option looks like an ambiguous abbreviation of two or more long
  options, but all the possible interpretations would return the same
  value, then just return that value without complaining that it's
  ambiguous.

o If a long option could be interpreted either as an exact match for one
  long option, or as an abbreviation for one or more other long options,
  then treat it as the exact match.

These changes align NetBSD's getopt_long(3) with the current behavior of
GNU getopt_long(3), the de facto standard, and FreeBSD's getopt_long(3).

/*	$NetBSD: getopt_long.c,v 1.21 2007/07/05 16:05:40 ginsbach Exp $	*/

/*-
 * Copyright (c) 2000 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Dieter Baron and Thomas Klausner.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: getopt_long.c,v 1.21 2007/07/05 16:05:40 ginsbach Exp $");
#endif /* LIBC_SCCS and not lint */

#include "namespace.h"

#include <assert.h>
#include <err.h>
#include <errno.h>
#if HAVE_NBTOOL_CONFIG_H
#include "compat_getopt.h"
#else
#include <getopt.h>
#endif
#include <stdlib.h>
#include <string.h>

#if HAVE_NBTOOL_CONFIG_H && !HAVE_GETOPT_LONG && !HAVE_DECL_OPTIND
#define REPLACE_GETOPT
#endif

#ifdef REPLACE_GETOPT
#ifdef __weak_alias
__weak_alias(getopt,_getopt)
#endif
int	opterr = 1;		/* if error message should be printed */
int	optind = 1;		/* index into parent argv vector */
int	optopt = '?';		/* character checked for validity */
int	optreset;		/* reset getopt */
char    *optarg;		/* argument associated with option */
#elif HAVE_NBTOOL_CONFIG_H && !HAVE_DECL_OPTRESET
static int optreset;
#endif

#ifdef __weak_alias
__weak_alias(getopt_long,_getopt_long)
#endif

#if !HAVE_GETOPT_LONG
#define IGNORE_FIRST	(*options == '-' || *options == '+')
#define PRINT_ERROR	((opterr) && ((*options != ':') \
				      || (IGNORE_FIRST && options[1] != ':')))
#define IS_POSIXLY_CORRECT (getenv("POSIXLY_CORRECT") != NULL)
#define PERMUTE         (!IS_POSIXLY_CORRECT && !IGNORE_FIRST)
/* XXX: GNU ignores PC if *options == '-' */
#define IN_ORDER        (!IS_POSIXLY_CORRECT && *options == '-')

/* return values */
#define	BADCH	(int)'?'
#define	BADARG		((IGNORE_FIRST && options[1] == ':') \
			 || (*options == ':') ? (int)':' : (int)'?')
#define INORDER (int)1

#define	EMSG	""

static int getopt_internal __P((int, char **, const char *));
static int gcd __P((int, int));
static void permute_args __P((int, int, int, char **));

static const char *place = EMSG; /* option letter processing */

/* XXX: set optreset to 1 rather than these two */
static int nonopt_start = -1; /* first non option argument (for permute) */
static int nonopt_end = -1;   /* first option after non options (for permute) */

/* Error messages */
static const char recargchar[] = "option requires an argument -- %c";
static const char recargstring[] = "option requires an argument -- %s";
static const char ambig[] = "ambiguous option -- %.*s";
static const char noarg[] = "option doesn't take an argument -- %.*s";
static const char illoptchar[] = "unknown option -- %c";
static const char illoptstring[] = "unknown option -- %s";


/*
 * Compute the greatest common divisor of a and b.
 */
static int
gcd(a, b)
	int a;
	int b;
{
	int c;

	c = a % b;
	while (c != 0) {
		a = b;
		b = c;
		c = a % b;
	}
	   
	return b;
}

/*
 * Exchange the block from nonopt_start to nonopt_end with the block
 * from nonopt_end to opt_end (keeping the same order of arguments
 * in each block).
 */
static void
permute_args(panonopt_start, panonopt_end, opt_end, nargv)
	int panonopt_start;
	int panonopt_end;
	int opt_end;
	char **nargv;
{
	int cstart, cyclelen, i, j, ncycle, nnonopts, nopts, pos;
	char *swap;

	_DIAGASSERT(nargv != NULL);

	/*
	 * compute lengths of blocks and number and size of cycles
	 */
	nnonopts = panonopt_end - panonopt_start;
	nopts = opt_end - panonopt_end;
	ncycle = gcd(nnonopts, nopts);
	cyclelen = (opt_end - panonopt_start) / ncycle;

	for (i = 0; i < ncycle; i++) {
		cstart = panonopt_end+i;
		pos = cstart;
		for (j = 0; j < cyclelen; j++) {
			if (pos >= panonopt_end)
				pos -= nnonopts;
			else
				pos += nopts;
			swap = nargv[pos];
			nargv[pos] = nargv[cstart];
			nargv[cstart] = swap;
		}
	}
}

/*
 * getopt_internal --
 *	Parse argc/argv argument vector.  Called by user level routines.
 *  Returns -2 if -- is found (can be long option or end of options marker).
 */
static int
getopt_internal(nargc, nargv, options)
	int nargc;
	char **nargv;
	const char *options;
{
	char *oli;				/* option letter list index */
	int optchar;

	_DIAGASSERT(nargv != NULL);
	_DIAGASSERT(options != NULL);

	optarg = NULL;

	/*
	 * XXX Some programs (like rsyncd) expect to be able to
	 * XXX re-initialize optind to 0 and have getopt_long(3)
	 * XXX properly function again.  Work around this braindamage.
	 */
	if (optind == 0)
		optind = 1;

	if (optreset)
		nonopt_start = nonopt_end = -1;
start:
	if (optreset || !*place) {		/* update scanning pointer */
		optreset = 0;
		if (optind >= nargc) {          /* end of argument vector */
			place = EMSG;
			if (nonopt_end != -1) {
				/* do permutation, if we have to */
				permute_args(nonopt_start, nonopt_end,
				    optind, nargv);
				optind -= nonopt_end - nonopt_start;
			}
			else if (nonopt_start != -1) {
				/*
				 * If we skipped non-options, set optind
				 * to the first of them.
				 */
				optind = nonopt_start;
			}
			nonopt_start = nonopt_end = -1;
			return -1;
		}
		if ((*(place = nargv[optind]) != '-')
		    || (place[1] == '\0')) {    /* found non-option */
			place = EMSG;
			if (IN_ORDER) {
				/*
				 * GNU extension: 
				 * return non-option as argument to option 1
				 */
				optarg = nargv[optind++];
				return INORDER;
			}
			if (!PERMUTE) {
				/*
				 * if no permutation wanted, stop parsing
				 * at first non-option
				 */
				return -1;
			}
			/* do permutation */
			if (nonopt_start == -1)
				nonopt_start = optind;
			else if (nonopt_end != -1) {
				permute_args(nonopt_start, nonopt_end,
				    optind, nargv);
				nonopt_start = optind -
				    (nonopt_end - nonopt_start);
				nonopt_end = -1;
			}
			optind++;
			/* process next argument */
			goto start;
		}
		if (nonopt_start != -1 && nonopt_end == -1)
			nonopt_end = optind;
		if (place[1] && *++place == '-') {	/* found "--" */
			place++;
			return -2;
		}
	}
	if ((optchar = (int)*place++) == (int)':' ||
	    (oli = strchr(options + (IGNORE_FIRST ? 1 : 0), optchar)) == NULL) {
		/* option letter unknown or ':' */
		if (!*place)
			++optind;
		if (PRINT_ERROR)
			warnx(illoptchar, optchar);
		optopt = optchar;
		return BADCH;
	}
	if (optchar == 'W' && oli[1] == ';') {		/* -W long-option */
		/* XXX: what if no long options provided (called by getopt)? */
		if (*place) 
			return -2;

		if (++optind >= nargc) {	/* no arg */
			place = EMSG;
			if (PRINT_ERROR)
				warnx(recargchar, optchar);
			optopt = optchar;
			return BADARG;
		} else				/* white space */
			place = nargv[optind];
		/*
		 * Handle -W arg the same as --arg (which causes getopt to
		 * stop parsing).
		 */
		return -2;
	}
	if (*++oli != ':') {			/* doesn't take argument */
		if (!*place)
			++optind;
	} else {				/* takes (optional) argument */
		optarg = NULL;
		if (*place)			/* no white space */
			optarg = __UNCONST(place);
		/* XXX: disable test for :: if PC? (GNU doesn't) */
		else if (oli[1] != ':') {	/* arg not optional */
			if (++optind >= nargc) {	/* no arg */
				place = EMSG;
				if (PRINT_ERROR)
					warnx(recargchar, optchar);
				optopt = optchar;
				return BADARG;
			} else
				optarg = nargv[optind];
		}
		place = EMSG;
		++optind;
	}
	/* dump back option letter */
	return optchar;
}

#ifdef REPLACE_GETOPT
/*
 * getopt --
 *	Parse argc/argv argument vector.
 *
 * [eventually this will replace the real getopt]
 */
int
getopt(nargc, nargv, options)
	int nargc;
	char * const *nargv;
	const char *options;
{
	int retval;

	_DIAGASSERT(nargv != NULL);
	_DIAGASSERT(options != NULL);

	retval = getopt_internal(nargc, __UNCONST(nargv), options);
	if (retval == -2) {
		++optind;
		/*
		 * We found an option (--), so if we skipped non-options,
		 * we have to permute.
		 */
		if (nonopt_end != -1) {
			permute_args(nonopt_start, nonopt_end, optind,
				       nargv);
			optind -= nonopt_end - nonopt_start;
		}
		nonopt_start = nonopt_end = -1;
		retval = -1;
	}
	return retval;
}
#endif

/*
 * getopt_long --
 *	Parse argc/argv argument vector.
 */
int
getopt_long(nargc, nargv, options, long_options, idx)
	int nargc;
	char * const *nargv;
	const char *options;
	const struct option *long_options;
	int *idx;
{
	int retval;

#define IDENTICAL_INTERPRETATION(_x, _y)				\
	(long_options[(_x)].has_arg == long_options[(_y)].has_arg &&	\
	 long_options[(_x)].flag == long_options[(_y)].flag &&		\
	 long_options[(_x)].val == long_options[(_y)].val)

	_DIAGASSERT(nargv != NULL);
	_DIAGASSERT(options != NULL);
	_DIAGASSERT(long_options != NULL);
	/* idx may be NULL */

	retval = getopt_internal(nargc, __UNCONST(nargv), options);
	if (retval == -2) {
		char *current_argv, *has_equal;
		size_t current_argv_len;
		int i, ambiguous, match;

		current_argv = __UNCONST(place);
		match = -1;
		ambiguous = 0;

		optind++;
		place = EMSG;

		if (*current_argv == '\0') {		/* found "--" */
			/*
			 * We found an option (--), so if we skipped
			 * non-options, we have to permute.
			 */
			if (nonopt_end != -1) {
				permute_args(nonopt_start, nonopt_end,
				    optind, __UNCONST(nargv));
				optind -= nonopt_end - nonopt_start;
			}
			nonopt_start = nonopt_end = -1;
			return -1;
		}
		if ((has_equal = strchr(current_argv, '=')) != NULL) {
			/* argument found (--option=arg) */
			current_argv_len = has_equal - current_argv;
			has_equal++;
		} else
			current_argv_len = strlen(current_argv);
	    
		for (i = 0; long_options[i].name; i++) {
			/* find matching long option */
			if (strncmp(current_argv, long_options[i].name,
			    current_argv_len))
				continue;

			if (strlen(long_options[i].name) ==
			    (unsigned)current_argv_len) {
				/* exact match */
				match = i;
				ambiguous = 0;
				break;
			}
			if (match == -1)		/* partial match */
				match = i;
			else if (!IDENTICAL_INTERPRETATION(i, match))
				ambiguous = 1;
		}
		if (ambiguous) {
			/* ambiguous abbreviation */
			if (PRINT_ERROR)
				warnx(ambig, (int)current_argv_len,
				     current_argv);
			optopt = 0;
			return BADCH;
		}
		if (match != -1) {			/* option found */
		        if (long_options[match].has_arg == no_argument
			    && has_equal) {
				if (PRINT_ERROR)
					warnx(noarg, (int)current_argv_len,
					     current_argv);
				/*
				 * XXX: GNU sets optopt to val regardless of
				 * flag
				 */
				if (long_options[match].flag == NULL)
					optopt = long_options[match].val;
				else
					optopt = 0;
				return BADARG;
			}
			if (long_options[match].has_arg == required_argument ||
			    long_options[match].has_arg == optional_argument) {
				if (has_equal)
					optarg = has_equal;
				else if (long_options[match].has_arg ==
				    required_argument) {
					/*
					 * optional argument doesn't use
					 * next nargv
					 */
					optarg = nargv[optind++];
				}
			}
			if ((long_options[match].has_arg == required_argument)
			    && (optarg == NULL)) {
				/*
				 * Missing argument; leading ':'
				 * indicates no error should be generated
				 */
				if (PRINT_ERROR)
					warnx(recargstring, current_argv);
				/*
				 * XXX: GNU sets optopt to val regardless
				 * of flag
				 */
				if (long_options[match].flag == NULL)
					optopt = long_options[match].val;
				else
					optopt = 0;
				--optind;
				return BADARG;
			}
		} else {			/* unknown option */
			if (PRINT_ERROR)
				warnx(illoptstring, current_argv);
			optopt = 0;
			return BADCH;
		}
		if (long_options[match].flag) {
			*long_options[match].flag = long_options[match].val;
			retval = 0;
		} else 
			retval = long_options[match].val;
		if (idx)
			*idx = match;
	}
	return retval;
#undef IDENTICAL_INTERPRETATION
}
#endif /* !GETOPT_LONG */