X-Git-Url: https://git.xinqibao.xyz/slstatus.git/blobdiff_plain/96f3a8a54eeb3b2294ed953dad8b15349f3e2703..a4fe8c97414f07dd8b891e0d325dd2733195151d:/util.c

diff --git a/util.c b/util.c
index cd3524b..6113049 100644
--- a/util.c
+++ b/util.c
@@ -1,4 +1,5 @@
 /* See LICENSE file for copyright and license details. */
+#include <errno.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <string.h>
@@ -9,15 +10,16 @@ const char *
 bprintf(const char *fmt, ...)
 {
 	va_list ap;
-	size_t len;
+	int ret;
 
 	va_start(ap, fmt);
-	len = vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
+	if ((ret = vsnprintf(buf, sizeof(buf), fmt, ap)) < 0) {
+		fprintf(stderr, "vsnprintf: %s\n", strerror(errno));
+	} else if ((size_t)ret >= sizeof(buf)) {
+		fprintf(stderr, "vsnprintf: Output truncated\n");
+	}
 	va_end(ap);
 
-	if (len >= sizeof(buf))
-		buf[sizeof(buf)-1] = '\0';
-
 	return buf;
 }
 
@@ -29,7 +31,7 @@ pscanf(const char *path, const char *fmt, ...)
 	int n;
 
 	if (!(fp = fopen(path, "r"))) {
-		fprintf(stderr, "fopen for %s failed", path);
+		fprintf(stderr, "fopen '%s': %s\n", path, strerror(errno));
 		return -1;
 	}
 	va_start(ap, fmt);