ref: 072c965ba5fef4c4f431b5fb7b520ec0ca807555
parent: a40d599cd79610b3f731a9e167f4c6d4ba446183
author: ISSOtm <[email protected]>
date: Tue Nov 5 19:40:55 EST 2019
Add musl's implementation of `getopt_long_only` Both `getopt_long` and `getopt_long_only` are GNU-specific, so we'll be copying musl's implementation for portability. This was retrieved as of commit 90251cf73dfdd44e7a3f085d236e89a7dff1b00b. musl is licensed as MIT, which is compatible (being identical...) to RGBDS'. The file is being copied as-is, without a copyright notice or attribution, but this is only to have a verbatim copy in the history. Those will be added in the next commit.
--- /dev/null
+++ b/include/extern/getopt.h
@@ -1,0 +1,30 @@
+#ifndef _GETOPT_H
+#define _GETOPT_H
+
+#ifdef __cplusplus
+extern "C" {+#endif
+
+int getopt(int, char * const [], const char *);
+extern char *optarg;
+extern int optind, opterr, optopt, optreset;
+
+struct option {+ const char *name;
+ int has_arg;
+ int *flag;
+ int val;
+};
+
+int getopt_long(int, char *const *, const char *, const struct option *, int *);
+int getopt_long_only(int, char *const *, const char *, const struct option *, int *);
+
+#define no_argument 0
+#define required_argument 1
+#define optional_argument 2
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
--- /dev/null
+++ b/src/extern/getopt.c
@@ -1,0 +1,148 @@
+#define _GNU_SOURCE
+#include <stddef.h>
+#include <stdlib.h>
+#include <limits.h>
+#include <getopt.h>
+#include <stdio.h>
+#include <string.h>
+#include "stdio_impl.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;
+}
+
+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][1] == '-' && argv[optind][2])))
+ {+ int colon = optstring[optstring[0]=='+'||optstring[0]=='-']==':';
+ int i, cnt, match;
+ char *arg, *opt, *start = argv[optind]+1;
+ for (cnt=i=0; longopts[i].name; i++) {+ const char *name = longopts[i].name;
+ opt = start;
+ if (*opt == '-') opt++;
+ while (*opt && *opt != '=' && *opt == *name)
+ name++, opt++;
+ if (*opt && *opt != '=') continue;
+ arg = opt;
+ match = i;
+ if (!*name) {+ cnt = 1;
+ break;
+ }
+ cnt++;
+ }
+ if (cnt==1 && longonly && arg-start == mblen(start, MB_LEN_MAX)) {+ int l = arg-start;
+ for (i=0; optstring[i]; i++) {+ int j;
+ for (j=0; j<l && start[j]==optstring[i+j]; j++);
+ if (j==l) {+ cnt++;
+ break;
+ }
+ }
+ }
+ if (cnt==1) {+ i = match;
+ opt = arg;
+ optind++;
+ if (*opt == '=') {+ if (!longopts[i].has_arg) {+ optopt = longopts[i].val;
+ 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])) {+ optopt = longopts[i].val;
+ 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] == '-') {+ optopt = 0;
+ 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);
+}