ref: caba3c6ab89bf631a0c12eab72d51d0353e0f782
parent: eefded827f06cef7aca1ff2fc4900facd856d272
author: Jacob Moody <moody@posixcafe.org>
date: Sun May 7 16:14:34 EDT 2023
gendor getopt
--- /dev/null
+++ b/src/getopt.c
@@ -1,0 +1,284 @@
+/*
+ * Copyright © 2005-2020 Rich Felker, et al.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/* This implementation was taken from musl and modified for RGBDS */
+
+#include <u.h>
+#include <libc.h>
+#include <stdio.h>
+
+#include "getopt.h"
+
+char *optarg;
+int optind = 1, musl_opterr = 1, musl_optopt;
+int musl_optreset = 0;
+static int musl_optpos;
+
+static void musl_getopt_msg(char const *a, char const *b, char const *c, size_t l)
+{+ FILE *f = stderr;
+
+ if (fputs(a, f) >= 0 &&
+ fwrite(b, strlen(b), 1, f) &&
+ fwrite(c, 1, l, f) == l)
+ putc('\n', f);+}
+
+static int getopt(int argc, char *argv[], char const *optstring)
+{+ int i;
+ wchar_t c, d;
+ int k, l;
+ char *optchar;
+
+ if (!optind || musl_optreset) {+ musl_optreset = 0;
+ musl_optpos = 0;
+ optind = 1;
+ }
+
+ if (optind >= argc || !argv[optind])
+ return -1;
+
+ if (argv[optind][0] != '-') {+ if (optstring[0] == '-') {+ optarg = argv[optind++];
+ return 1;
+ }
+ return -1;
+ }
+
+ if (!argv[optind][1])
+ return -1;
+
+ if (argv[optind][1] == '-' && !argv[optind][2])
+ return optind++, -1;
+
+ if (!musl_optpos)
+ musl_optpos++;
+ k = mbtowc(&c, argv[optind] + musl_optpos, MB_LEN_MAX);
+ if (k < 0) {+ k = 1;
+ c = 0xfffd; /* replacement char */
+ }
+ optchar = argv[optind] + musl_optpos;
+ musl_optpos += k;
+
+ if (!argv[optind][musl_optpos]) {+ optind++;
+ musl_optpos = 0;
+ }
+
+ if (optstring[0] == '-' || optstring[0] == '+')
+ optstring++;
+
+ i = 0;
+ d = 0;
+ do {+ l = mbtowc(&d, optstring+i, MB_LEN_MAX);
+ if (l > 0)
+ i += l;
+ else
+ i++;
+ } while (l && d != c);
+
+ if (d != c || c == ':') {+ musl_optopt = c;
+ if (optstring[0] != ':' && musl_opterr)
+ musl_getopt_msg(argv[0], ": unrecognized option: ", optchar, k);
+ return '?';
+ }
+ if (optstring[i] == ':') {+ optarg = 0;
+ if (optstring[i + 1] != ':' || musl_optpos) {+ optarg = argv[optind++] + musl_optpos;
+ musl_optpos = 0;
+ }
+ if (optind > argc) {+ musl_optopt = c;
+ if (optstring[0] == ':')
+ return ':';
+ if (musl_opterr)
+ musl_getopt_msg(argv[0], ": option requires an argument: ",
+ optchar, k);
+ return '?';
+ }
+ }
+ return c;
+}
+
+static void permute(char **argv, int dest, int src)
+{+ char *tmp = argv[src];
+ int i;
+
+ for (i = src; i > dest; i--)
+ argv[i] = argv[i-1];
+ argv[dest] = tmp;
+}
+
+static int getopt_long_core(int argc, char **argv, char const *optstring,
+ const struct option *longopts, int *idx, int longonly);
+
+int getopt_long(int argc, char **argv, char const *optstring,
+ const struct option *longopts, int *idx, int longonly)
+{+ int ret, skipped, resumed;
+
+ if (!optind || musl_optreset) {+ musl_optreset = 0;
+ musl_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 **argv, char const *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 = 0;
+ char *arg = 0, *opt, *start = argv[optind] + 1;
+
+ for (cnt = i = 0; longopts[i].name; i++) {+ char const *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 = 0;
+
+ while (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) {+ musl_optopt = longopts[i].val;
+ if (colon || !musl_opterr)
+ return '?';
+ musl_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) {+ optarg = argv[optind];
+ if (!optarg) {+ musl_optopt = longopts[i].val;
+ if (colon)
+ return ':';
+ if (!musl_opterr)
+ return '?';
+ musl_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] == '-') {+ musl_optopt = 0;
+ if (!colon && musl_opterr)
+ musl_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_only(int argc, char **argv, char const *optstring,
+ const struct option *longopts, int *idx)
+{+ return getopt_long(argc, argv, optstring, longopts, idx, 1);
+}
--- /dev/null
+++ b/src/getopt.h
@@ -1,0 +1,65 @@
+/*
+ * Copyright © 2005-2020 Rich Felker, et al.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/* This implementation was taken from musl and modified for RGBDS */
+
+#ifndef RGBDS_EXTERN_GETOPT_H
+#define RGBDS_EXTERN_GETOPT_H
+
+#ifdef __cplusplus
+extern "C" {+#endif
+
+#ifdef __plan9__
+typedef ulong size_t;
+typedef Rune wchar_t;
+enum { MB_LEN_MAX = 4 };+#define mblen(r,n) (utfnlen(r, n))
+#define mbtowc(r,s,n) (chartorune(r,s))
+#endif
+
+extern char *optarg;
+extern int optind, musl_opterr, musl_optopt, musl_optreset;
+
+struct option {+ char const *name;
+ int has_arg;
+ int *flag;
+ int val;
+};
+
+int getopt_long(int argc, char **argv, char const *optstring,
+ const struct option *longopts, int *idx, int longonly);
+
+int getopt_long_only(int argc, char **argv, char const *optstring,
+ const struct option *longopts, int *idx);
+
+#define no_argument 0
+#define required_argument 1
+#define optional_argument 2
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif