libutils: add sprintf()

Preparing for C++ support in TAs.

Implement sprintf() in libutils.

Signed-off-by: Jerome Forissier <jerome@forissier.org>
Acked-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>

5 files changed, 31 insertions, 0 deletions

diff --git a/lib/libutils/ext/include/printk.h b/lib/libutils/ext/include/printk.h
index 0a5e1034..4f21b25c 100644
--- a/lib/libutils/ext/include/printk.h
+++ b/lib/libutils/ext/include/printk.h
@@ -22,5 +22,7 @@ int vsnprintk(char *str, size_t size, const char *fmt, va_list ap)
 
 int __vsnprintf(char *str, size_t size, const char *fmt, va_list ap,
 		bool ext) __attribute__((__format__(__printf__, 3, 0)));
+int __vsprintf(char *bf, const char *fmt, va_list ap)
+			__attribute__((__format__(__printf__, 2, 0)));
 
 #endif /* PRINTK_H */
diff --git a/lib/libutils/ext/snprintk.c b/lib/libutils/ext/snprintk.c
index b6bb2807..8d1744ee 100644
--- a/lib/libutils/ext/snprintk.c
+++ b/lib/libutils/ext/snprintk.c
@@ -150,6 +150,11 @@ __vsnprintf(char *bf, size_t size, const char *fmt, va_list ap,
 	return retval;
 }
 
+int __vsprintf(char *bf, const char *fmt, va_list ap)
+{
+	return kprintf(fmt, TOBUFONLY, NULL, bf, ap, false);
+}
+
 /*
  * kprintf: scaled down version of printf(3).
  *
diff --git a/lib/libutils/isoc/include/stdio.h b/lib/libutils/isoc/include/stdio.h
index ae41dc4f..ec545207 100644
--- a/lib/libutils/isoc/include/stdio.h
+++ b/lib/libutils/isoc/include/stdio.h
@@ -12,6 +12,10 @@ typedef struct _FILE FILE;
 
 int printf(const char *fmt, ...)
                     __attribute__ ((__format__ (__printf__, 1, 2)));
+/* sprintf() is unsafe and should not be used. Prefer snprintf(). */
+int sprintf(char *str, const char *fmt, ...)
+                    __attribute__ ((__format__ (__printf__, 2, 3)))
+                    __attribute__ ((deprecated));
 int snprintf(char *str, size_t size, const char *fmt, ...)
                     __attribute__ ((__format__ (__printf__, 3, 4)));
 int vsnprintf (char *str, size_t size, const char *fmt, va_list ap)
diff --git a/lib/libutils/isoc/sprintf.c b/lib/libutils/isoc/sprintf.c
new file mode 100644
index 00000000..663956ec
--- /dev/null
+++ b/lib/libutils/isoc/sprintf.c
@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: BSD-2-Clause
+/*
+ * Copyright (c) 2020, Huawei Technologies Co., Ltd
+ */
+
+#include <printk.h>
+#include <stdio.h>
+
+int sprintf(char *str, const char *fmt, ...)
+{
+	int retval;
+	va_list ap;
+
+	va_start(ap, fmt);
+	retval = __vsprintf(str, fmt, ap);
+	va_end(ap);
+
+	return retval;
+}
diff --git a/lib/libutils/isoc/sub.mk b/lib/libutils/isoc/sub.mk
index 4a092683..3811b916 100644
--- a/lib/libutils/isoc/sub.mk
+++ b/lib/libutils/isoc/sub.mk
@@ -11,6 +11,7 @@ srcs-y += isxdigit.c
 srcs-y += qsort.c
 cflags-qsort.c-y += -Wno-inline
 cflags-remove-qsort.c-y += -Wcast-align
+srcs-y += sprintf.c
 srcs-y += snprintf.c
 srcs-y += stack_check.c
 srcs-y += strdup.c