+/* Process the argument starting with d->__nextchar as a long option.
+ d->optind should *not* have been advanced over this argument.
+
+ If the value returned is -1, it was not actually a long option, the
+ state is unchanged, and the argument should be processed as a set
+ of short options (this can only happen when long_only is true).
+ Otherwise, the option (and its argument, if any) have been consumed
+ and the return value is the value to return from _getopt_internal_r. */
+static int
+process_long_option (int argc, char **argv, const char *optstring,
+ const struct option *longopts, int *longind,
+ int long_only, struct _getopt_data *d,
+ int print_errors, const char *prefix)
+{
+ char *nameend;
+ size_t namelen;
+ const struct option *p;
+ const struct option *pfound = NULL;
+ int n_options;
+ int option_index;
+
+ for (nameend = d->__nextchar; *nameend && *nameend != '='; nameend++)
+ /* Do nothing. */ ;
+ namelen = nameend - d->__nextchar;
+
+ /* First look for an exact match, counting the options as a side
+ effect. */
+ for (p = longopts, n_options = 0; p->name; p++, n_options++)
+ if (!strncmp (p->name, d->__nextchar, namelen)
+ && namelen == strlen (p->name))
+ {
+ /* Exact match found. */
+ pfound = p;
+ option_index = n_options;
+ break;
+ }
+
+ if (pfound == NULL)
+ {
+ /* Didn't find an exact match, so look for abbreviations. */
+ unsigned char *ambig_set = NULL;
+ int ambig_malloced = 0;
+ int ambig_fallback = 0;
+ int indfound = -1;
+
+ for (p = longopts, option_index = 0; p->name; p++, option_index++)
+ if (!strncmp (p->name, d->__nextchar, namelen))
+ {
+ if (pfound == NULL)
+ {
+ /* First nonexact match found. */
+ pfound = p;
+ indfound = option_index;
+ }
+ else if (long_only
+ || pfound->has_arg != p->has_arg
+ || pfound->flag != p->flag
+ || pfound->val != p->val)
+ {
+ /* Second or later nonexact match found. */
+ if (!ambig_fallback)
+ {
+ if (!print_errors)
+ /* Don't waste effort tracking the ambig set if
+ we're not going to print it anyway. */
+ ambig_fallback = 1;
+ else if (!ambig_set)
+ {
+ if (__libc_use_alloca (n_options))
+ ambig_set = alloca (n_options);
+ else if ((ambig_set = malloc (n_options)) == NULL)
+ /* Fall back to simpler error message. */
+ ambig_fallback = 1;
+ else
+ ambig_malloced = 1;
+
+ if (ambig_set)
+ {
+ memset (ambig_set, 0, n_options);
+ ambig_set[indfound] = 1;
+ }
+ }
+ if (ambig_set)
+ ambig_set[option_index] = 1;
+ }
+ }
+ }
+
+ if (ambig_set || ambig_fallback)
+ {
+ if (print_errors)
+ {
+ if (ambig_fallback)
+ fprintf (stderr, _("%s: option '%s%s' is ambiguous\n"),
+ argv[0], prefix, d->__nextchar);
+ else
+ {
+ flockfile (stderr);
+ fprintf (stderr,
+ _("%s: option '%s%s' is ambiguous; possibilities:"),
+ argv[0], prefix, d->__nextchar);
+
+ for (option_index = 0; option_index < n_options; option_index++)
+ if (ambig_set[option_index])
+ fprintf (stderr, " '%s%s'",
+ prefix, longopts[option_index].name);
+
+ /* This must use 'fprintf' even though it's only
+ printing a single character, so that it goes through
+ __fxprintf_nocancel when compiled as part of glibc. */
+ fprintf (stderr, "\n");
+ funlockfile (stderr);
+ }
+ }
+ if (ambig_malloced)
+ free (ambig_set);
+ d->__nextchar += strlen (d->__nextchar);
+ d->optind++;
+ d->optopt = 0;
+ return '?';
+ }
+
+ option_index = indfound;
+ }
+
+ if (pfound == NULL)
+ {
+ /* Can't find it as a long option. If this is not getopt_long_only,
+ or the option starts with '--' or is not a valid short option,
+ then it's an error. */
+ if (!long_only || argv[d->optind][1] == '-'
+ || strchr (optstring, *d->__nextchar) == NULL)
+ {
+ if (print_errors)
+ fprintf (stderr, _("%s: unrecognized option '%s%s'\n"),
+ argv[0], prefix, d->__nextchar);
+
+ d->__nextchar = NULL;
+ d->optind++;
+ d->optopt = 0;
+ return '?';
+ }
+
+ /* Otherwise interpret it as a short option. */
+ return -1;
+ }
+
+ /* We have found a matching long option. Consume it. */
+ d->optind++;
+ d->__nextchar = NULL;
+ if (*nameend)
+ {
+ /* Don't test has_arg with >, because some C compilers don't
+ allow it to be used on enums. */
+ if (pfound->has_arg)
+ d->optarg = nameend + 1;
+ else
+ {
+ if (print_errors)
+ fprintf (stderr,
+ _("%s: option '%s%s' doesn't allow an argument\n"),
+ argv[0], prefix, pfound->name);
+
+ d->optopt = pfound->val;
+ return '?';
+ }
+ }
+ else if (pfound->has_arg == 1)
+ {
+ if (d->optind < argc)
+ d->optarg = argv[d->optind++];
+ else
+ {
+ if (print_errors)
+ fprintf (stderr,
+ _("%s: option '%s%s' requires an argument\n"),
+ argv[0], prefix, pfound->name);
+
+ d->optopt = pfound->val;
+ return optstring[0] == ':' ? ':' : '?';
+ }
+ }
+
+ if (longind != NULL)
+ *longind = option_index;
+ if (pfound->flag)
+ {
+ *(pfound->flag) = pfound->val;
+ return 0;
+ }
+ return pfound->val;
+}
+
+/* Initialize internal data upon the first call to getopt. */