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fix getopt wrongly treating colons in optstring as valid option chars

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the ':' in optstring has special meaning as a flag applying to the
previous option character, or to getopt's error handling behavior when
it appears at the beginning. don't also accept a "-:" option based on
its presence.
This commit is contained in:
Rich Felker 2018-02-24 10:26:26 -05:00
parent 82f176803a
commit b123f23952
1 changed files with 1 additions and 1 deletions
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2
src/misc/getopt.c
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@ -77,7 +77,7 @@ int getopt(int argc, char * const argv[], const char *optstring)
if (l>0) i+=l; else i++;
} while (l && d != c);
if (d != c) {
if (d != c || c == ':') {
optopt = c;
if (optstring[0] != ':' && opterr)
__getopt_msg(argv[0], ": unrecognized option: ", optchar, k);