libutils: isoc: implement tolower(), isdigit() and isxdigit()

Signed-off-by: Jerome Forissier <[email protected]>
Reviewed-by: Jens Wiklander <[email protected]>
Acked-by: Joakim Bech <[email protected]>

lib/libutils/isoc/isdigit.c

@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: BSD-2-Clause
+/*
+ * Copyright (c) 2018, Linaro Limited
+ */
+#include <ctype.h>
+
+int __builtin_isdigit(int c)
+{
+	if (c >= '0' && c <= '9')
+		return 1;
+	return 0;
+}

lib/libutils/isoc/isxdigit.c

@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: BSD-2-Clause
+/*
+ * Copyright (c) 2018, Linaro Limited
+ */
+#include <ctype.h>
+
+int __builtin_isxdigit(int c)
+{
+	if (isdigit(c))
+		return 1;
+	if (c >= 'A' && c <= 'F')
+		return 1;
+	if (c >= 'a' && c <= 'f')
+		return 1;
+	return 0;
+}

lib/libutils/isoc/sub.mk

@@ -6,17 +6,17 @@ cflags-bget_malloc.c-y += -Wno-sign-compare -Wno-cast-align
 ifeq ($(sm),core)
 cflags-remove-bget_malloc.c-y += $(cflags_kasan)
 endif
+srcs-y += isdigit.c
+srcs-y += isxdigit.c
 srcs-y += malloc_lock.c
-
-srcs-y += snprintf.c
-
-srcs-y += stack_check.c
 srcs-y += qsort.c
 cflags-qsort.c-y += -Wno-inline
 cflags-remove-qsort.c-y += -Wcast-align
-
+srcs-y += snprintf.c
+srcs-y += stack_check.c
 srcs-y += strdup.c
 srcs-y += strndup.c
+srcs-y += tolower.c
 
 subdirs-y += newlib
 subdirs-$(arch_arm) += arch/$(ARCH)

lib/libutils/isoc/tolower.c

@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: BSD-2-Clause
+/*
+ * Copyright (c) 2015, Linaro Limited
+ */
+#include <ctype.h>
+
+int __builtin_tolower(int c)
+{
+	if (c >= 'A' && c <= 'Z')
+		return c - 'A' + 'a';
+	return c;
+}