Introduce a getopt() implementation based on the one from musl.
The only deviations are adaption to the kernel coding style and nolibc
infrastructure and removal of multi-byte support.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@xxxxxxxxxxxxx>
---
tools/include/nolibc/Makefile | 1 +
tools/include/nolibc/getopt.h | 105 ++++++++++++++++++++++++++++++++++++++++++
tools/include/nolibc/nolibc.h | 1 +
3 files changed, 107 insertions(+)
diff --git a/tools/include/nolibc/Makefile b/tools/include/nolibc/Makefile
index dceec0e1a135119108d6f4dcb3d2ec57c002ffd3..821a716094549ff9ee2fbe006fb7b3066e5e418d 100644
--- a/tools/include/nolibc/Makefile
+++ b/tools/include/nolibc/Makefile
@@ -31,6 +31,7 @@ all_files := \
ctype.h \
dirent.h \
errno.h \
+ getopt.h \
nolibc.h \
signal.h \
stackprotector.h \
diff --git a/tools/include/nolibc/getopt.h b/tools/include/nolibc/getopt.h
new file mode 100644
index 0000000000000000000000000000000000000000..35aee582681b79e21bce8ddbf634ae9dfdef8f1d
--- /dev/null
+++ b/tools/include/nolibc/getopt.h
@@ -0,0 +1,105 @@
+/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
+/*
+ * getopt function definitions for NOLIBC, adapted from musl libc
+ * Copyright (C) 2005-2020 Rich Felker, et al.
+ * Copyright (C) 2025 Thomas Weißschuh <linux@xxxxxxxxxxxxxx>
+ */
+
+#ifndef _NOLIBC_GETOPT_H
+#define _NOLIBC_GETOPT_H
+
+struct FILE;
+static struct FILE *const stderr;
+static int fprintf(struct FILE *stream, const char *fmt, ...);
+
+__attribute__((weak,unused,section(".data.nolibc_getopt")))
+char *optarg;
+__attribute__((weak,unused,section(".data.nolibc_getopt")))
+int optind = 1;
+__attribute__((weak,unused,section(".data.nolibc_getopt")))
+int opterr = 1;
+__attribute__((weak,unused,section(".data.nolibc_getopt")))
+int optopt;
+__attribute__((weak,unused,section(".data.nolibc_getopt")))
+int __optpos;
+
+static __inline__
+int getopt(int argc, char * const argv[], const char *optstring)
+{
+ int i;
+ char c, d;
+ char *optchar;
+
+ if (!optind) {
+ __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 (!__optpos)
+ __optpos++;
+ c = argv[optind][__optpos];
+ optchar = argv[optind] + __optpos;
+ __optpos++;
+
+ if (!argv[optind][__optpos]) {
+ optind++;
+ __optpos = 0;
+ }
+
+ if (optstring[0] == '-' || optstring[0] == '+')
+ optstring++;
+
+ i = 0;
+ d = 0;
+ do {
+ d = optstring[i++];
+ } while (d && d != c);
+
+ if (d != c || c == ':') {
+ optopt = c;
+ if (optstring[0] != ':' && opterr)
+ fprintf(stderr, "%s: unrecognized option: %c\n", argv[0], *optchar);
+ return '?';
+ }
+ if (optstring[i] == ':') {
+ optarg = 0;
+ if (optstring[i + 1] != ':' || __optpos) {
+ optarg = argv[optind++];
+ if (__optpos)
+ optarg += __optpos;
+ __optpos = 0;
+ }
+ if (optind > argc) {
+ optopt = c;
+ if (optstring[0] == ':')
+ return ':';
+ if (opterr)
+ fprintf(stderr, "%s: option requires argument: %c\n",
+ argv[0], *optchar);
+ return '?';
+ }
+ }
+ return c;
+}
+
+/* make sure to include all global symbols */
+#include "nolibc.h"
+
+#endif /* _NOLIBC_GETOPT_H */
diff --git a/tools/include/nolibc/nolibc.h b/tools/include/nolibc/nolibc.h
index 05d92afedb7258f0e3c311bf6f12be68b25d6e9a..d4043051072928f43d4d73c0e509430087c66e94 100644
--- a/tools/include/nolibc/nolibc.h
+++ b/tools/include/nolibc/nolibc.h
@@ -106,6 +106,7 @@
#include "time.h"
#include "stackprotector.h"
#include "dirent.h"
+#include "getopt.h"
/* Used by programs to avoid std includes */
#define NOLIBC
--
2.48.1
