code base: simplify checks against value returned from snprintf() via wrapper.

1 files changed, 39 insertions, 0 deletions

diff --git a/src/internal/slibtool_snprintf_impl.c b/src/internal/slibtool_snprintf_impl.c
new file mode 100644
index 0000000..d883af6
--- /dev/null
+++ b/src/internal/slibtool_snprintf_impl.c
@@ -0,0 +1,39 @@
+/*******************************************************************/
+/*  slibtool: a skinny libtool implementation, written in C        */
+/*  Copyright (C) 2016--2021  SysDeer Technologies, LLC            */
+/*  Released under the Standard MIT License; see COPYING.SLIBTOOL. */
+/*******************************************************************/
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include "slibtool_snprintf_impl.h"
+
+
+/*****************************************************************/
+/* snprintf() wrapper that simplifies usage via the following:  */
+/*                                                             */
+/* (1) fail (return a negative result) in case the buffer is  */
+/*     not sufficiently large for the formatted string plus  */
+/*     the terminating null character.                      */
+/*                                                         */
+/**********************************************************/
+
+
+int slbt_snprintf(char * buf, size_t buflen, const char * fmt, ...)
+{
+	va_list	ap;
+	size_t  nbytes;
+
+	va_start(ap,fmt);
+	nbytes = vsnprintf(buf,buflen,fmt,ap);
+	va_end(ap);
+
+	if (nbytes >= buflen)
+		return -1;
+
+	return nbytes;
+}