add strnlen and isdigit helpers

This is missing and will come in handy for path parsing.

Signed-off-by: Carlos Maiolino <[email protected]>

1 files changed, 16 insertions, 0 deletions

diff --git a/src/lib/string.c b/src/lib/string.c
index e5b6972..365381b 100644
--- a/src/lib/string.c
+++ b/src/lib/string.c
@@ -1,4 +1,10 @@
 #include <stddef.h>
+#include <stdbool.h>
+
+bool isdigit(char c)
+{
+	return c >= 48 && c <= 57;
+}
 
 size_t strlen(const char *s)
 {
@@ -10,6 +16,16 @@ size_t strlen(const char *s)
 	return c;
 }
 
+size_t strnlen(const char *s, size_t maxlen)
+{
+	size_t c = 0;
+
+	while (c <= maxlen && s[c])
+		c++;
+
+	return c;
+}
+
 char *strcpy(char *restrict dst, const char *restrict src)
 {
 	size_t pos = 0;