[PATCH 3/4] parse-options: add new function "usage_msg_opt"
From: Christian Couder <hidden>
Date: 2016-06-15 22:46:04
Subsystem:
the rest · Maintainer:
Linus Torvalds
This function can be used instead of "usage_with_options" when you
want to print an error message before the usage string.
It may be useful because:
if (condition)
usage_msg_opt("condition is false", usage, opts);
is shorter than:
if (condition) {
fprintf(stderr, "condition is false\n\n");
usage_with_options(usage, opts);
}
and may be more consistent.
Signed-off-by: Christian Couder <redacted>
---
parse-options.c | 8 ++++++++
parse-options.h | 4 ++++
2 files changed, 12 insertions(+), 0 deletions(-)
This patch may be generaly useful.
diff --git a/parse-options.c b/parse-options.c
index 4c5d09d..7a5fde8 100644
--- a/parse-options.c
+++ b/parse-options.c@@ -449,6 +449,14 @@ void usage_with_options(const char * const *usagestr, exit(129); } +void usage_msg_opt(const char *msg, + const char * const *usagestr, + const struct option *options) +{ + fprintf(stderr, "%s\n\n", msg); + usage_with_options(usagestr, options); +} + int parse_options_usage(const char * const *usagestr, const struct option *opts) {
diff --git a/parse-options.h b/parse-options.h
index 9122905..6061a19 100644
--- a/parse-options.h
+++ b/parse-options.h@@ -113,6 +113,10 @@ extern int parse_options(int argc, const char **argv, extern NORETURN void usage_with_options(const char * const *usagestr, const struct option *options); +extern NORETURN void usage_msg_opt(const char *msg, + const char * const *usagestr, + const struct option *options); + /*----- incremantal advanced APIs -----*/ enum {
--
1.6.1.2.353.g99fdd.dirty