string: Add strchrnul()

This functions works like strchr() but returns the end of the string if
the character is not found. Add an implementation of this.

Signed-off-by: Simon Glass <sjg@chromium.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/lib/string.c b/lib/string.c
index e94021c4680..e6e749b80b2 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -230,6 +230,14 @@ char * strchr(const char * s, int c)
 }
 #endif
 
+const char *strchrnul(const char *s, int c)
+{
+	for (; *s != (char)c; ++s)
+		if (*s == '\0')
+			break;
+	return s;
+}
+
 #ifndef __HAVE_ARCH_STRRCHR
 /**
  * strrchr - Find the last occurrence of a character in a string