Add a "fork" of musl as //fusl.

fusl/src/misc/getopt_long.c

+#define _GNU_SOURCE
+#include <stddef.h>
+#include <getopt.h>
+#include <stdio.h>
+#include <string.h>
+
+extern int __optpos, __optreset;
+
+static void permute(char *const *argv, int dest, int src)
+{
+        char **av = (char **)argv;
+        char *tmp = av[src];
+        int i;
+        for (i=src; i>dest; i--)
+                av[i] = av[i-1];
+        av[dest] = tmp;
+}
+
+void __getopt_msg(const char *, const char *, const char *, size_t);
+
+static int __getopt_long_core(int argc, char *const *argv, const char *optstring, const struct option *longopts, int *idx, int longonly);
+
+static int __getopt_long(int argc, char *const *argv, const char *optstring, const struct option *longopts, int *idx, int longonly)
+{
+        int ret, skipped, resumed;
+        if (!optind || __optreset) {
+                __optreset = 0;
+                __optpos = 0;
+                optind = 1;
+        }
+        if (optind >= argc || !argv[optind]) return -1;
+        skipped = optind;
+        if (optstring[0] != '+' && optstring[0] != '-') {
+                int i;
+                for (i=optind; ; i++) {
+                        if (i >= argc || !argv[i]) return -1;
+                        if (argv[i][0] == '-' && argv[i][1]) break;
+                }
+                optind = i;
+        }
+        resumed = optind;
+        ret = __getopt_long_core(argc, argv, optstring, longopts, idx, longonly);
+        if (resumed > skipped) {
+                int i, cnt = optind-resumed;
+                for (i=0; i<cnt; i++)
+                        permute(argv, skipped, optind-1);
+                optind = skipped + cnt;
+        }
+        return ret;
+}
+
+static int __getopt_long_core(int argc, char *const *argv, const char *optstring, const struct option *longopts, int *idx, int longonly)
+{
+        optarg = 0;
+        if (longopts && argv[optind][0] == '-' &&
+                ((longonly && argv[optind][1]) ||
+                 (argv[optind][1] == '-' && argv[optind][2])))
+        {
+                int colon = optstring[optstring[0]=='+'||optstring[0]=='-']==':';
+                int i, cnt, match;
+                char *opt;
+                for (cnt=i=0; longopts[i].name; i++) {
+                        const char *name = longopts[i].name;
+                        opt = argv[optind]+1;
+                        if (*opt == '-') opt++;
+                        for (; *name && *name == *opt; name++, opt++);
+                        if (*opt && *opt != '=') continue;
+                        match = i;
+                        if (!*name) {
+                                cnt = 1;
+                                break;
+                        }
+                        cnt++;
+                }
+                if (cnt==1) {
+                        i = match;
+                        optind++;
+                        optopt = longopts[i].val;
+                        if (*opt == '=') {
+                                if (!longopts[i].has_arg) {
+                                        if (colon || !opterr)
+                                                return '?';
+                                        __getopt_msg(argv[0],
+                                                ": option does not take an argument: ",
+                                                longopts[i].name,
+                                                strlen(longopts[i].name));
+                                        return '?';
+                                }
+                                optarg = opt+1;
+                        } else if (longopts[i].has_arg == required_argument) {
+                                if (!(optarg = argv[optind])) {
+                                        if (colon) return ':';
+                                        if (!opterr) return '?';
+                                        __getopt_msg(argv[0],
+                                                ": option requires an argument: ",
+                                                longopts[i].name,
+                                                strlen(longopts[i].name));
+                                        return '?';
+                                }
+                                optind++;
+                        }
+                        if (idx) *idx = i;
+                        if (longopts[i].flag) {
+                                *longopts[i].flag = longopts[i].val;
+                                return 0;
+                        }
+                        return longopts[i].val;
+                }
+                if (argv[optind][1] == '-') {
+                        if (!colon && opterr)
+                                __getopt_msg(argv[0], cnt ?
+                                        ": option is ambiguous: " :
+                                        ": unrecognized option: ",
+                                        argv[optind]+2,
+                                        strlen(argv[optind]+2));
+                        optind++;
+                        return '?';
+                }
+        }
+        return getopt(argc, argv, optstring);
+}
+
+int getopt_long(int argc, char *const *argv, const char *optstring, const struct option *longopts, int *idx)
+{
+        return __getopt_long(argc, argv, optstring, longopts, idx, 0);
+}
+
+int getopt_long_only(int argc, char *const *argv, const char *optstring, const struct option *longopts, int *idx)
+{
+        return __getopt_long(argc, argv, optstring, longopts, idx, 1);
+}