wflinfo: Print all error messages to stderr, not stdout

Some tools interpret messages on stderr as *errors*, and treat stdout
differently, and sometimes ignore stdout completely.

Signed-off-by: Chad Versace <chad.versace@linux.intel.com>

1 files changed, 7 insertions, 10 deletions

diff --git a/src/utils/wflinfo.c b/src/utils/wflinfo.c
index 8ab18a6..7169900 100644
--- a/src/utils/wflinfo.c
+++ b/src/utils/wflinfo.c
@@ -128,12 +128,10 @@ error_printf(const char *module, const char *fmt, ...)
 {
     va_list ap;
 
-    fflush(stdout);
-
     va_start(ap, fmt);
-    printf("%s error: ", module);
-    vprintf(fmt, ap);
-    printf("\n");
+    fprintf(stderr, "%s error: ", module);
+    vfprintf(stderr, fmt, ap);
+    fprintf(stderr, "\n");
     va_end(ap);
 
     exit(EXIT_FAILURE);
@@ -149,18 +147,17 @@ write_usage_and_exit(FILE *f, int exit_code)
 static void __attribute__((noreturn))
 usage_error_printf(const char *fmt, ...)
 {
-    fflush(stdout);
-    printf("Wflinfo usage error: ");
+    fprintf(stderr, "Wflinfo usage error: ");
 
     if (fmt) {
         va_list ap;
         va_start(ap, fmt);
-        vprintf(fmt, ap);
+        vfprintf(stderr, fmt, ap);
         va_end(ap);
-        printf(" ");
+        fprintf(stderr, " ");
     }
 
-    printf("(see wflinfo --help)\n");
+    fprintf(stderr, "(see wflinfo --help)\n");
     exit(EXIT_FAILURE);
 }