Fix segfault in log_internal if prefix is APK_OUT_LOG_ONLY

This commit fixes a regression which was introduced in changeset
646c834492a419a96b4032c230e842d27f87e997. If apk_out_fmt() is called
while out->log is set and prefix is set to APK_OUT_LOG_ONLY, then
apk_out_fmt() would pass this prefix to log_internal() which would, in
turn, attempt to write it to standard out using fprintf().
Unfortunately, doing so wont work as intended if prefix is ((char*)-1)
(i.e. APK_OUT_LOG_ONLY) and will cause a segmentation fault instead.

This commit fixes this segmentation fault by not printing the prefix in
log_internal() if it is either NULL or APK_OUT_LOG_ONLY.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/print.c b/src/print.c
index cc82c49..0203cbb 100644
--- a/src/print.c
+++ b/src/print.c
@@ -127,7 +127,7 @@ static int apk_out_get_width(struct apk_out *out)
 static void log_internal(FILE *dest, const char *prefix, const char *format, va_list va)
 {
 	if (dest != stdout) fflush(stdout);
-	if (prefix != NULL) fprintf(dest, "%s", prefix);
+	if (prefix != NULL && prefix != APK_OUT_LOG_ONLY) fprintf(dest, "%s", prefix);
 	vfprintf(dest, format, va);
 	fprintf(dest, "\n");
 	fflush(dest);