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Tweak GETOPT_RESET comment 

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2017-04-12 20:21:34 +02:00
parent 835ad3a984
commit 352ddd3d21
1 changed files with 3 additions and 5 deletions
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8
include/libbb.h
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@ -1176,19 +1176,17 @@ extern const char *applet_long_options;
#endif
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
* extensions such as '+' 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?
* Then BSD introduced additional variable "optreset" which should 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).