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parseopt: make usage optional

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Allow usagestr to be NULL and don't display any help screen in
this case.  This is useful to implement incremental parsers.

Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
René Scharfe 2009-03-08 19:16:58 +01:00 committed by Junio C Hamano
parent b92891f978
commit 49b6180252
1 changed files with 3 additions and 0 deletions
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3
parse-options.c
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@ -364,6 +364,9 @@ int parse_options(int argc, const char **argv, const struct option *options,
int usage_with_options_internal(const char * const *usagestr,
const struct option *opts, int full)
{
if (!usagestr)
return PARSE_OPT_HELP;
fprintf(stderr, "usage: %s\n", *usagestr++);
while (*usagestr && **usagestr)
fprintf(stderr, " or: %s\n", *usagestr++);