Merge "feat(lib): implement strnlen secure and strcpy secure function" into integration
diff --git a/include/lib/libc/string.h b/include/lib/libc/string.h
index 8129404..bba9816 100644
--- a/include/lib/libc/string.h
+++ b/include/lib/libc/string.h
@@ -30,5 +30,7 @@
size_t strlcpy(char * dst, const char * src, size_t dsize);
size_t strlcat(char * dst, const char * src, size_t dsize);
char *strtok_r(char *s, const char *delim, char **last);
+size_t strnlen_secure(const char *str, size_t maxlen);
+int strcpy_secure(char *restrict dest, size_t dest_size, const char *restrict src);
#endif /* STRING_H */
diff --git a/lib/libc/libc_common.mk b/lib/libc/libc_common.mk
index 5f44bd5..3b83216 100644
--- a/lib/libc/libc_common.mk
+++ b/lib/libc/libc_common.mk
@@ -21,9 +21,11 @@
snprintf.c \
strchr.c \
strcmp.c \
+ strcpy_secure.c \
strlcat.c \
strlcpy.c \
strlen.c \
+ strnlen_secure.c \
strncmp.c \
strnlen.c \
strrchr.c \
diff --git a/lib/libc/strcpy_secure.c b/lib/libc/strcpy_secure.c
new file mode 100644
index 0000000..6f8de29
--- /dev/null
+++ b/lib/libc/strcpy_secure.c
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2024-2025, Altera Corporation. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <errno.h>
+#include <stddef.h>
+#include <string.h>
+#include <stdint.h>
+
+int strcpy_secure(char *restrict dest, size_t dest_size, const char *restrict src)
+{
+ /* Check for null pointers */
+ if ((dest == NULL) || (src == NULL)) {
+ return -EINVAL;
+ }
+
+ /* Check the destination size valid range */
+ if (dest_size == 0) {
+ return -ERANGE;
+ }
+
+ /* Calculate the length of the source string */
+ size_t src_len = strnlen_secure(src, dest_size);
+
+ /* Check if the source string fits in the destination buffer */
+ if (src_len >= dest_size) {
+ /* Set destination to an empty string */
+ dest[0] = '\0';
+ return -ERANGE;
+ }
+
+ /* Copy the source string to the destination */
+ for (dest[src_len] = '\0'; src_len > 0; src_len--) {
+ dest[src_len - 1] = src[src_len - 1];
+ }
+
+ return 0;
+}
diff --git a/lib/libc/strnlen_secure.c b/lib/libc/strnlen_secure.c
new file mode 100644
index 0000000..36b3571
--- /dev/null
+++ b/lib/libc/strnlen_secure.c
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2024-2025, Altera Corporation. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <string.h>
+
+size_t strnlen_secure(const char *str, size_t maxlen)
+{
+ size_t len = 0;
+
+ if (str == NULL) {
+ return 0;
+ }
+
+ while ((len < maxlen) && (str[len] != '\0')) {
+ len++;
+ }
+
+ return len;
+}