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zephyr/lib/posix/getopt/getopt_long.c

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/* $OpenBSD: getopt_long.c,v 1.22 2006/10/04 21:29:04 jmc Exp $ */
/* $NetBSD: getopt_long.c,v 1.15 2002/01/31 22:43:40 tv Exp $ */
/*
* Copyright (c) 2002 Todd C. Miller <Todd.Miller@courtesan.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Sponsored in part by the Defense Advanced Research Projects
* Agency (DARPA) and Air Force Research Laboratory, Air Force
* Materiel Command, USAF, under agreement number F39502-99-1-0512.
*/
/*
* 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.
*/
#include <string.h>
#include "getopt.h"
#include "getopt_common.h"
#include <zephyr/logging/log.h>
LOG_MODULE_DECLARE(getopt);
#define GNU_COMPATIBLE /* Be more compatible, configure's use us! */
#define PRINT_ERROR ((state->opterr) && (*options != ':'))
#define FLAG_PERMUTE 0x01 /* permute non-options to the end of argv */
#define FLAG_ALLARGS 0x02 /* treat non-options as args to option "-1" */
#define FLAG_LONGONLY 0x04 /* operate as getopt_long_only */
/* return values */
#define BADCH (int)'?'
#define BADARG ((*options == ':') ? (int)':' : (int)'?')
#define INORDER 1
#define EMSG ""
#ifdef GNU_COMPATIBLE
#define NO_PREFIX (-1)
#define D_PREFIX 0
#define DD_PREFIX 1
#define W_PREFIX 2
#endif
static int getopt_internal(struct getopt_state *, int, char * const *,
const char *, const struct option *, int *, int);
static int parse_long_options(struct getopt_state *, char * const *,
const char *, const struct option *, int *, int,
int);
static int gcd(int, int);
static void permute_args(int, int, int, char *const *);
/* Error messages */
#define RECARGCHAR "option requires an argument -- %c"
#define ILLOPTCHAR "illegal option -- %c" /* From P1003.2 */
#ifdef GNU_COMPATIBLE
static int dash_prefix = NO_PREFIX;
#define GNUOPTCHAR "invalid option -- %c"
#define RECARGSTRING "option `%s%s' requires an argument"
#define AMBIG "option `%s%.*s' is ambiguous"
#define NOARG "option `%s%.*s' doesn't allow an argument"
#define ILLOPTSTRING "unrecognized option `%s%s'"
#else
#define RECARGSTRING "option requires an argument -- %s"
#define AMBIG "ambiguous option -- %.*s"
#define NOARG "option doesn't take an argument -- %.*s"
#define ILLOPTSTRING "unknown option -- %s"
#endif
/*
* Compute the greatest common divisor of a and b.
*/
static int
gcd(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(int panonopt_start, int panonopt_end, int opt_end,
char * const *nargv)
{
int cstart, cyclelen, i, j, ncycle, nnonopts, nopts, pos;
char *swap;
/*
* 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];
/* LINTED const cast */
((char **) nargv)[pos] = nargv[cstart];
/* LINTED const cast */
((char **)nargv)[cstart] = swap;
}
}
}
/*
* parse_long_options --
* Parse long options in argc/argv argument vector.
* Returns -1 if short_too is set and the option does not match long_options.
*/
static int
parse_long_options(struct getopt_state *state, char * const *nargv,
const char *options, const struct option *long_options,
int *idx, int short_too, int flags)
{
char *current_argv, *has_equal;
#ifdef GNU_COMPATIBLE
char *current_dash;
#endif
size_t current_argv_len;
int i, match, exact_match, second_partial_match;
current_argv = state->place;
#ifdef GNU_COMPATIBLE
if (PRINT_ERROR) {
switch (dash_prefix) {
case D_PREFIX:
current_dash = "-";
break;
case DD_PREFIX:
current_dash = "--";
break;
case W_PREFIX:
current_dash = "-W ";
break;
default:
current_dash = "";
break;
}
}
#endif
match = -1;
exact_match = 0;
second_partial_match = 0;
state->optind++;
has_equal = strchr(current_argv, '=');
if (has_equal != 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) == current_argv_len) {
/* exact match */
match = i;
exact_match = 1;
break;
}
/*
* If this is a known short option, don't allow
* a partial match of a single character.
*/
if (short_too && current_argv_len == 1) {
continue;
}
if (match == -1) { /* first partial match */
match = i;
} else if ((flags & FLAG_LONGONLY) ||
long_options[i].has_arg != long_options[match].has_arg ||
long_options[i].flag != long_options[match].flag ||
long_options[i].val != long_options[match].val) {
second_partial_match = 1;
}
}
if (!exact_match && second_partial_match) {
/* ambiguous abbreviation */
if (PRINT_ERROR) {
LOG_WRN(AMBIG,
#ifdef GNU_COMPATIBLE
current_dash,
#endif
(int)current_argv_len,
current_argv);
}
state->optopt = 0;
return BADCH;
}
if (match != -1) { /* option found */
if (long_options[match].has_arg == no_argument
&& has_equal) {
if (PRINT_ERROR) {
LOG_WRN(NOARG,
#ifdef GNU_COMPATIBLE
current_dash,
#endif
(int)current_argv_len,
current_argv);
}
/*
* XXX: GNU sets optopt to val regardless of flag
*/
if (long_options[match].flag == NULL) {
state->optopt = long_options[match].val;
} else {
state->optopt = 0;
}
#ifdef GNU_COMPATIBLE
return BADCH;
#else
return BADARG;
#endif
}
if (long_options[match].has_arg == required_argument ||
long_options[match].has_arg == optional_argument) {
if (has_equal) {
state->optarg = has_equal;
} else if (long_options[match].has_arg == required_argument) {
/*
* optional argument doesn't use next nargv
*/
state->optarg = nargv[state->optind++];
}
}
if ((long_options[match].has_arg == required_argument)
&& (state->optarg == NULL)) {
/*
* Missing argument; leading ':' indicates no error
* should be generated.
*/
if (PRINT_ERROR) {
LOG_WRN(RECARGSTRING,
#ifdef GNU_COMPATIBLE
current_dash,
#endif
current_argv);
}
/*
* XXX: GNU sets optopt to val regardless of flag
*/
if (long_options[match].flag == NULL) {
state->optopt = long_options[match].val;
} else {
state->optopt = 0;
}
--state->optind;
return BADARG;
}
} else { /* unknown option */
if (short_too) {
--state->optind;
return -1;
}
if (PRINT_ERROR) {
LOG_WRN(ILLOPTSTRING,
#ifdef GNU_COMPATIBLE
current_dash,
#endif
current_argv);
}
state->optopt = 0;
return BADCH;
}
if (idx) {
*idx = match;
}
if (long_options[match].flag) {
*long_options[match].flag = long_options[match].val;
return 0;
} else {
return long_options[match].val;
}
}
/*
* getopt_internal --
* Parse argc/argv argument vector. Called by user level routines.
*/
static int
getopt_internal(struct getopt_state *state, int nargc, char * const *nargv,
const char *options, const struct option *long_options,
int *idx, int flags)
{
char *oli; /* option letter list index */
int optchar, short_too;
if (options == NULL) {
return -1;
}
/*
* Disable GNU extensions if options string begins with a '+'.
*/
#ifdef GNU_COMPATIBLE
if (*options == '-') {
flags |= FLAG_ALLARGS;
} else if (*options == '+') {
flags &= ~FLAG_PERMUTE;
}
#else
if (*options == '+')
flags &= ~FLAG_PERMUTE;
else if (*options == '-')
flags |= FLAG_ALLARGS;
#endif
if (*options == '+' || *options == '-') {
options++;
}
/*
* XXX Some GNU programs (like cvs) set optind to 0 instead of
* XXX using optreset. Work around this braindamage.
*/
if (state->optind == 0) {
state->optind = state->optreset = 1;
}
state->optarg = NULL;
if (state->optreset) {
state->nonopt_start = state->nonopt_end = -1;
}
start:
if (state->optreset || !*(state->place)) {/* update scanning pointer */
state->optreset = 0;
if (state->optind >= nargc) { /* end of argument vector */
state->place = EMSG;
if (state->nonopt_end != -1) {
/* do permutation, if we have to */
permute_args(state->nonopt_start,
state->nonopt_end,
state->optind, nargv);
state->optind -= state->nonopt_end -
state->nonopt_start;
} else if (state->nonopt_start != -1) {
/*
* If we skipped non-options, set optind
* to the first of them.
*/
state->optind = state->nonopt_start;
}
state->nonopt_start = state->nonopt_end = -1;
return -1;
}
state->place = nargv[state->optind];
if (*(state->place) != '-' ||
#ifdef GNU_COMPATIBLE
state->place[1] == '\0') {
#else
(state->place[1] == '\0' && strchr(options, '-') == NULL)) {
#endif
state->place = EMSG; /* found non-option */
if (flags & FLAG_ALLARGS) {
/*
* GNU extension:
* return non-option as argument to option 1
*/
state->optarg = nargv[state->optind++];
return INORDER;
}
if (!(flags & FLAG_PERMUTE)) {
/*
* If no permutation wanted, stop parsing
* at first non-option.
*/
return -1;
}
/* do permutation */
if (state->nonopt_start == -1) {
state->nonopt_start = state->optind;
} else if (state->nonopt_end != -1) {
permute_args(state->nonopt_start,
state->nonopt_end,
state->optind,
nargv);
state->nonopt_start = state->optind -
(state->nonopt_end - state->nonopt_start);
state->nonopt_end = -1;
}
state->optind++;
/* process next argument */
goto start;
}
if (state->nonopt_start != -1 && state->nonopt_end == -1) {
state->nonopt_end = state->optind;
}
/*
* If we have "-" do nothing, if "--" we are done.
*/
if (state->place[1] != '\0' && *++(state->place) == '-' &&
state->place[1] == '\0') {
state->optind++;
state->place = EMSG;
/*
* We found an option (--), so if we skipped
* non-options, we have to permute.
*/
if (state->nonopt_end != -1) {
permute_args(state->nonopt_start,
state->nonopt_end,
state->optind,
nargv);
state->optind -= state->nonopt_end -
state->nonopt_start;
}
state->nonopt_start = state->nonopt_end = -1;
return -1;
}
}
/*
* Check long options if:
* 1) we were passed some
* 2) the arg is not just "-"
* 3) either the arg starts with -- we are getopt_long_only()
*/
if (long_options != NULL && state->place != nargv[state->optind] &&
(*(state->place) == '-' || (flags & FLAG_LONGONLY))) {
short_too = 0;
#ifdef GNU_COMPATIBLE
dash_prefix = D_PREFIX;
#endif
if (*(state->place) == '-') {
state->place++; /* --foo long option */
#ifdef GNU_COMPATIBLE
dash_prefix = DD_PREFIX;
#endif
} else if (*(state->place) != ':' && strchr(options, *(state->place)) != NULL) {
short_too = 1; /* could be short option too */
}
optchar = parse_long_options(state, nargv, options,
long_options, idx, short_too,
flags);
if (optchar != -1) {
state->place = EMSG;
return optchar;
}
}
optchar = (int)*(state->place)++;
oli = strchr(options, optchar);
if (optchar == (int)':' ||
(optchar == (int)'-' && *(state->place) != '\0') ||
oli == NULL) {
/*
* If the user specified "-" and '-' isn't listed in
* options, return -1 (non-option) as per POSIX.
* Otherwise, it is an unknown option character (or ':').
*/
if (optchar == (int)'-' && *(state->place) == '\0') {
return -1;
}
if (!*(state->place)) {
++state->optind;
}
#ifdef GNU_COMPATIBLE
if (PRINT_ERROR) {
LOG_WRN(GNUOPTCHAR, optchar);
}
#else
if (PRINT_ERROR) {
LOG_WRN(ILLOPTCHAR, optchar);
}
#endif
state->optopt = optchar;
return BADCH;
}
if (long_options != NULL && optchar == 'W' && oli[1] == ';') {
/* -W long-option */
if (*(state->place)) { /* no space */
; /* NOTHING */
} else if (++(state->optind) >= nargc) { /* no arg */
state->place = EMSG;
if (PRINT_ERROR) {
LOG_WRN(RECARGCHAR, optchar);
}
state->optopt = optchar;
return BADARG;
} else if ((state->optind) < nargc) {
state->place = nargv[state->optind];
}
#ifdef GNU_COMPATIBLE
dash_prefix = W_PREFIX;
#endif
optchar = parse_long_options(state, nargv, options,
long_options, idx, 0, flags);
state->place = EMSG;
return optchar;
}
if (*++oli != ':') { /* doesn't take argument */
if (!*(state->place)) {
++state->optind;
}
} else { /* takes (optional) argument */
state->optarg = NULL;
if (*(state->place)) { /* no white space */
state->optarg = state->place;
} else if (oli[1] != ':') { /* arg not optional */
if (++state->optind >= nargc) { /* no arg */
state->place = EMSG;
if (PRINT_ERROR) {
LOG_WRN(RECARGCHAR, optchar);
}
state->optopt = optchar;
return BADARG;
}
state->optarg = nargv[state->optind];
}
state->place = EMSG;
++state->optind;
}
/* dump back option letter */
return optchar;
}
/*
* getopt_long --
* Parse argc/argv argument vector.
*/
int
getopt_long(int nargc, char *const *nargv,
const char *options, const struct option *long_options,
int *idx)
{
struct getopt_state *state;
int ret;
/* Get state of the current thread */
state = getopt_state_get();
ret = getopt_internal(state, nargc, nargv, options, long_options, idx,
FLAG_PERMUTE);
z_getopt_global_state_update(state);
return ret;
}
/*
* getopt_long_only --
* Parse argc/argv argument vector.
*/
int
getopt_long_only(int nargc, char *const *nargv,
const char *options, const struct option *long_options,
int *idx)
{
struct getopt_state *state;
int ret;
/* Get state of the current thread */
state = getopt_state_get();
ret = getopt_internal(state, nargc, nargv, options, long_options, idx,
FLAG_PERMUTE|FLAG_LONGONLY);
z_getopt_global_state_update(state);
return ret;
}
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