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-rw-r--r--usage.c20
1 files changed, 18 insertions, 2 deletions
diff --git a/usage.c b/usage.c
index fd936a1..b6aea45 100644
--- a/usage.c
+++ b/usage.c
@@ -64,8 +64,24 @@ 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));
+ char str_error[256], *err;
+ int i, j;
+
+ err = strerror(errno);
+ for (i = j = 0; err[i] && j < sizeof(str_error) - 1; ) {
+ if ((str_error[j++] = err[i++]) != '%')
+ continue;
+ if (j < sizeof(str_error) - 1) {
+ str_error[j++] = '%';
+ } else {
+ /* No room to double the '%', so we overwrite it with
+ * '\0' below */
+ j--;
+ break;
+ }
+ }
+ str_error[j] = 0;
+ snprintf(fmt_with_err, sizeof(fmt_with_err), "%s: %s", fmt, str_error);
va_start(params, fmt);
die_routine(fmt_with_err, params);