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

fusl/src/misc/getopt_long.c

Index: fusl/src/misc/getopt_long.c
diff --git a/fusl/src/misc/getopt_long.c b/fusl/src/misc/getopt_long.c
new file mode 100644
index 0000000000000000000000000000000000000000..480c00139e08682fd15d5798d871be4c85111b76
--- /dev/null
+++ b/fusl/src/misc/getopt_long.c
@@ -0,0 +1,131 @@
+#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);
+}