LU-12861 libcfs: provide an scnprintf and start using it

[fs/lustre-release.git] / libcfs / include / libcfs / util / string.h

diff --git a/libcfs/include/libcfs/util/string.h b/libcfs/include/libcfs/util/string.h
index 065829b..f73fd79 100644 (file)
--- a/libcfs/include/libcfs/util/string.h
+++ b/libcfs/include/libcfs/util/string.h
@@ -40,10 +40,42 @@
 #define __LIBCFS_UTIL_STRING_H__
 
 #include <stddef.h>
+#include <stdarg.h>
 
 #include <linux/types.h>
 #include <libcfs/util/list.h>
 
+static inline
+int vscnprintf(char *buf, size_t bufsz, const char *format, va_list args)
+{
+       int ret;
+
+       if (!bufsz)
+               return 0;
+
+       ret = vsnprintf(buf, bufsz, format, args);
+       return (bufsz > ret) ? ret : bufsz - 1;
+}
+
+/* __printf from linux kernel */
+#ifndef __printf
+#define __printf(a, b)         __attribute__((__format__(printf, a, b)))
+#endif
+
+__printf(3, 4)
+static inline int scnprintf(char *buf, size_t bufsz, const char *format, ...)
+{
+       int ret;
+       va_list args;
+
+       va_start(args, format);
+       ret = vscnprintf(buf, bufsz, format, args);
+       va_end(args);
+
+       return ret;
+}
+
+
 /**
  * Structure to represent NULL-less strings.
  */