path: root/usage.c
diff options
authorThomas Rast <>2009-06-27 15:58:44 (GMT)
committerJunio C Hamano <>2009-06-27 18:14:53 (GMT)
commitb875036e5a2ab569a2123abe9ebfe25258227951 (patch)
treec11c59688995601576bc6726db42e7d41ac755d9 /usage.c
parent26c117d05d0714ab688ebcafc8eb68c769152bde (diff)
Introduce die_errno() that appends strerror(errno) to die()
There are many calls to die() that do, or should, report strerror(errno) to indicate how the syscall they guard failed. Introduce a small helper function for this case. Note: - POSIX says vsnprintf can modify errno in some unlikely cases, so we have to use errno early. - We take some care to pass the original format to die_routine(), in case someone wants to call die_errno() with custom format characters. Signed-off-by: Thomas Rast <> Signed-off-by: Junio C Hamano <>
Diffstat (limited to 'usage.c')
1 files changed, 12 insertions, 0 deletions
diff --git a/usage.c b/usage.c
index 820d09f..fd936a1 100644
--- a/usage.c
+++ b/usage.c
@@ -60,6 +60,18 @@ void die(const char *err, ...)
+void die_errno(const char *fmt, ...)
+ va_list params;
+ char fmt_with_err[1024];
+ snprintf(fmt_with_err, sizeof(fmt_with_err), "%s: %s", fmt, strerror(errno));
+ va_start(params, fmt);
+ die_routine(fmt_with_err, params);
+ va_end(params);
int error(const char *err, ...)
va_list params;