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fix getopt handling of ':' modifier for multibyte option characters

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the previous hard-coded offsets of +1 and +2 contained a hidden
assumption that the option character matched was single-byte, despite
this implementation of getopt attempting to support multibyte option
characters. this patch reworks the matching logic to leave the final
index pointing just past the matched character so that fixed offsets
can be used to check for ':'.
This commit is contained in:
Rich Felker 2014-12-04 10:23:33 -05:00
parent be1f67ab6f
commit 014275b547
1 changed files with 9 additions and 4 deletions
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13
src/misc/getopt.c
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@ -58,7 +58,12 @@ int getopt(int argc, char * const argv[], const char *optstring)
if (optstring[0] == '-')
optstring++;
for (i=0; (l = mbtowc(&d, optstring+i, MB_LEN_MAX)) && d!=c; i+=l>0?l:1);
i = 0;
d = 0;
do {
l = mbtowc(&d, optstring+i, MB_LEN_MAX);
if (l>0) i+=l; else i++;
} while (l && d != c);
if (d != c) {
if (optstring[0] != ':' && opterr) {
@ -69,8 +74,8 @@ int getopt(int argc, char * const argv[], const char *optstring)
}
return '?';
}
if (optstring[i+1] == ':') {
if (optstring[i+2] == ':') optarg = 0;
if (optstring[i] == ':') {
if (optstring[i+1] == ':') optarg = 0;
else if (optind >= argc) {
if (optstring[0] == ':') return ':';
if (opterr) {
@ -81,7 +86,7 @@ int getopt(int argc, char * const argv[], const char *optstring)
}
return '?';
}
if (optstring[i+2] != ':' || optpos) {
if (optstring[i+1] != ':' || optpos) {
optarg = argv[optind++] + optpos;
optpos = 0;
}