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e4d3083006
Switch to using getopt_long(); include a version in case the platform lacks it. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
150 lines
3.2 KiB
C
150 lines
3.2 KiB
C
/*
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* getopt_long.c
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*
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* getopt_long(), or at least a common subset thereof:
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*
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* - Option reordering is not supported
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* - -W foo is not supported
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* - First optstring character "-" not supported.
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*/
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#include "config.h"
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char *optarg;
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int optind, opterr, optopt;
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static struct getopt_private_state {
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const char *optptr;
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const char *last_optstring;
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char *const *last_argv;
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} pvt;
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static inline const char *option_matches(const char *arg_str,
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const char *opt_name)
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{
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while (*arg_str != '\0' && *arg_str != '=') {
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if (*arg_str++ != *opt_name++)
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return NULL;
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}
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if (*opt_name)
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return NULL;
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return arg_str;
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}
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int getopt_long(int argc, char *const *argv, const char *optstring,
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const struct option *longopts, int *longindex)
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{
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const char *carg;
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const char *osptr;
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int opt;
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/* getopt() relies on a number of different global state
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variables, which can make this really confusing if there is
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more than one use of getopt() in the same program. This
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attempts to detect that situation by detecting if the
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"optstring" or "argv" argument have changed since last time
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we were called; if so, reinitialize the query state. */
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if (optstring != pvt.last_optstring || argv != pvt.last_argv ||
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optind < 1 || optind > argc) {
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/* optind doesn't match the current query */
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pvt.last_optstring = optstring;
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pvt.last_argv = argv;
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optind = 1;
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pvt.optptr = NULL;
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}
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carg = argv[optind];
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/* First, eliminate all non-option cases */
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if (!carg || carg[0] != '-' || !carg[1])
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return -1;
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if (carg[1] == '-') {
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const struct option *lo;
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const char *opt_end = NULL;
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optind++;
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/* Either it's a long option, or it's -- */
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if (!carg[2]) {
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/* It's -- */
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return -1;
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}
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for (lo = longopts; lo->name; lo++) {
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if ((opt_end = option_matches(carg+2, lo->name)))
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break;
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}
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if (!opt_end)
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return '?';
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if (longindex)
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*longindex = lo-longopts;
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if (*opt_end == '=') {
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if (lo->has_arg)
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optarg = (char *)opt_end+1;
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else
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return '?';
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} else if (lo->has_arg == 1) {
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if (!(optarg = argv[optind]))
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return '?';
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optind++;
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}
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if (lo->flag) {
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*lo->flag = lo->val;
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return 0;
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} else {
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return lo->val;
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}
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}
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if ((uintptr_t) (pvt.optptr - carg) > (uintptr_t) strlen(carg)) {
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/* Someone frobbed optind, change to new opt. */
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pvt.optptr = carg + 1;
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}
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opt = *pvt.optptr++;
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if (opt != ':' && (osptr = strchr(optstring, opt))) {
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if (osptr[1] == ':') {
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if (*pvt.optptr) {
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/* Argument-taking option with attached
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argument */
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optarg = (char *)pvt.optptr;
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optind++;
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} else {
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/* Argument-taking option with non-attached
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argument */
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if (argv[optind + 1]) {
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optarg = (char *)argv[optind+1];
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optind += 2;
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} else {
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/* Missing argument */
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optind++;
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return (optstring[0] == ':')
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? ':' : '?';
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}
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}
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return opt;
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} else {
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/* Non-argument-taking option */
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/* pvt.optptr will remember the exact position to
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resume at */
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if (!*pvt.optptr)
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optind++;
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return opt;
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}
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} else {
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/* Unknown option */
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optopt = opt;
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if (!*pvt.optptr)
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optind++;
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return '?';
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}
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}
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