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@linutronix.de Acked-by: Willy Tarreau w@1wt.eu --- tools/include/nolibc/Makefile | 1 + tools/include/nolibc/getopt.h | 101 ++++++++++++++++++++++++++++++++++++++++++ tools/include/nolibc/nolibc.h | 1 + 3 files changed, 103 insertions(+)
diff --git a/tools/include/nolibc/Makefile b/tools/include/nolibc/Makefile index f9702877ac21ab5ad30df1740e40e67f477f3824..e47e1607bab82f1d91effc025c9257e8a451f047 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 \ limits.h \ nolibc.h \ signal.h \ diff --git a/tools/include/nolibc/getopt.h b/tools/include/nolibc/getopt.h new file mode 100644 index 0000000000000000000000000000000000000000..5fd06c9702e96e8c58a6b242f535bca09db69343 --- /dev/null +++ b/tools/include/nolibc/getopt.h @@ -0,0 +1,101 @@ +/* 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@weissschuh.net + */ + +#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, opterr = 1, optopt; + +static __attribute__((unused)) +int getopt(int argc, char * const argv[], const char *optstring) +{ + static int __optpos; + 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 70872401aca8d5aa37b12ee585193353f692576d..187490535d1359aff371e2981118e62bcc0c6948 100644 --- a/tools/include/nolibc/nolibc.h +++ b/tools/include/nolibc/nolibc.h @@ -105,6 +105,7 @@ #include "time.h" #include "stackprotector.h" #include "dirent.h" +#include "getopt.h"
/* Used by programs to avoid std includes */ #define NOLIBC