diff options
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 2c30bde6f..11d022fb5 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. |