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always set optarg in getopt_long

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the standard getopt does not touch optarg unless processing an option
with an argument. however, programs using the GNU getopt API, which we
attempt to provide in getopt_long, expect optarg to be a null pointer
after processing an option without an argument.

before argument permutation support was added, such programs typically
detected its absence and used their own replacement getopt_long,
masking the discrepency in behavior.
This commit is contained in:
Rich Felker 2015-01-21 13:16:15 -05:00
parent 78a8ef47c4
commit e8e4e56a8c
1 changed files with 1 additions and 1 deletions
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src/misc/getopt_long.c
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@ -51,7 +51,7 @@ static int __getopt_long(int argc, char *const *argv, const char *optstring, con
static int __getopt_long_core(int argc, char *const *argv, const char *optstring, const struct option *longopts, int *idx, int longonly) static int __getopt_long_core(int argc, char *const *argv, const char *optstring, const struct option *longopts, int *idx, int longonly)
{ {
optarg = 0;
if (longopts && argv[optind][0] == '-' && if (longopts && argv[optind][0] == '-' &&
((longonly && argv[optind][1]) || ((longonly && argv[optind][1]) ||
(argv[optind][1] == '-' && argv[optind][2]))) (argv[optind][1] == '-' && argv[optind][2])))