Add a snprinf wrapper which checks that the buffer was big enough

[elogind.git] / src / shared / util.h

diff --git a/src/shared/util.h b/src/shared/util.h
index ca0c2e5e3deab194c1c7a03726ef8ce5ff7eba47..531242213490161c7572c25311c2d121289710fd 100644 (file)
--- a/src/shared/util.h
+++ b/src/shared/util.h
@@ -481,6 +481,8 @@ cpu_set_t* cpu_set_malloc(unsigned *ncpus);
 int status_vprintf(const char *status, bool ellipse, bool ephemeral, const char *format, va_list ap) _printf_(4,0);
 int status_printf(const char *status, bool ellipse, bool ephemeral, const char *format, ...) _printf_(4,5);
 
+#define xsprintf(buf, fmt, ...) assert_se((size_t) snprintf(buf, ELEMENTSOF(buf), fmt, __VA_ARGS__) < ELEMENTSOF(buf))
+
 int fd_columns(int fd);
 unsigned columns(void);
 int fd_lines(int fd);