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| author | Kaarle Ritvanen | 2017-04-12 00:58:46 +0300 |
|---|---|---|
| committer | Denys Vlasenko | 2017-04-12 20:11:34 +0200 |
| commit | 835ad3a984c5590ae4f6c94f2f0781ea049d1ae8 (patch) | |
| tree | cb86c5441c258f66358faa93ef899e09a7788de8 /include/libbb.h | |
| parent | c5496d3585bcab3c39f9b10f638ba0c94f5cda3f (diff) | |
| download | busybox-835ad3a984c5590ae4f6c94f2f0781ea049d1ae8.zip busybox-835ad3a984c5590ae4f6c94f2f0781ea049d1ae8.tar.gz | |
libbb: GETOPT_RESET macro
Signed-off-by: Kaarle Ritvanen <kaarle.ritvanen@datakunkku.fi>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'include/libbb.h')
| -rw-r--r-- | include/libbb.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/include/libbb.h b/include/libbb.h index 2c30bde..11d022f 100644 --- a/include/libbb.h +++ b/include/libbb.h @@ -1178,6 +1178,28 @@ extern uint32_t option_mask32; extern uint32_t getopt32(char **argv, const char *applet_opts, ...) FAST_FUNC; +/* BSD-derived getopt() functions require that optind be set to 1 in + * order to reset getopt() state. This used to be generally accepted + * way of resetting getopt(). However, glibc's getopt() + * has additional getopt() state beyond optind (specifically, glibc + * extensions ('+' and '-' at the start of the string), and requires + * that optind be set to zero to reset its state. BSD-derived versions + * of getopt() misbehaved if optind is set to 0 in order to reset getopt(), + * and glibc's getopt() used to coredump if optind is set 1 in order + * to reset getopt(). + * Then BSD introduced additional variable "optreset" which + * be set to 1 in order to reset getopt(). Sigh. Standards, anyone? + * + * By ~2008, OpenBSD 3.4 was changed to survive glibc-like optind = 0 + * (to interpret it as if optreset was set). + */ +#ifdef __GLIBC__ +#define GETOPT_RESET() (optind = 0) +#else /* BSD style */ +#define GETOPT_RESET() (optind = 1) +#endif + + /* Having next pointer as a first member allows easy creation * of "llist-compatible" structs, and using llist_FOO functions * on them. |