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Improved long optarg #26

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Improved long optarg #26

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ef504bf
Implement improved optional optarg parsing for long option.
dapimentel Feb 7, 2026
e83f4b6
Add cpp guard
dapimentel Feb 7, 2026
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7 changes: 6 additions & 1 deletion examples/long.c
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Original file line number Diff line number Diff line change
Expand Up @@ -48,7 +48,12 @@ int main(int argc, char **argv)
}
}

/* Print remaining arguments. */
printf("amend : %s\n", amend ? "true" : "false");
printf("brief : %s\n", brief ? "true" : "false");
printf("color : %s\n", color);
printf("delay : %d\n", delay);

printf("Print remaining arguments:\n");
while ((arg = optparse_arg(&options)))
printf("%s\n", arg);

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7 changes: 7 additions & 0 deletions optparse.h
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Original file line number Diff line number Diff line change
Expand Up @@ -348,6 +348,7 @@ optparse_long(struct optparse *options,
int *longindex)
{
int i;
char *next;
char *option = options->argv[options->optind];
if (option == 0) {
return -1;
Expand All @@ -373,6 +374,7 @@ optparse_long(struct optparse *options,
options->optopt = 0;
options->optarg = 0;
option += 2; /* skip "--" */
next = options->argv[options->optind + 1];
options->optind++;
for (i = 0; !optparse_longopts_end(longopts, i); i++) {
const char *name = longopts[i].longname;
Expand All @@ -392,6 +394,11 @@ optparse_long(struct optparse *options,
return optparse_error(options, OPTPARSE_MSG_MISSING, name);
else
options->optind++;
#ifdef IMPROVED_OPTPARSE_OPTIONAL
} else if (longopts[i].argtype == OPTPARSE_OPTIONAL) {
if (next && next[0] != '-')
options->optarg = options->argv[options->optind++];
#endif
}
return options->optopt;
}
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