[kvm-unit-tests PATCH 1/4] lib/string: add strnlen and strrchr

[Nikos Nikoleris <nikos.nikoleris@xxxxxxx>]

This change adds two functions from <string.h> in preparation for an
update in the libfdt.

Signed-off-by: Nikos Nikoleris <nikos.nikoleris@xxxxxxx>
---
 lib/string.h |  4 +++-
 lib/string.c | 23 +++++++++++++++++++++--
 2 files changed, 24 insertions(+), 3 deletions(-)

diff --git a/lib/string.h b/lib/string.h
index 493d51b..8da687e 100644
--- a/lib/string.h
+++ b/lib/string.h
@@ -7,12 +7,14 @@
 #ifndef __STRING_H
 #define __STRING_H
 
-extern unsigned long strlen(const char *buf);
+extern size_t strlen(const char *buf);
+extern size_t strnlen(const char *buf, size_t maxlen);
 extern char *strcat(char *dest, const char *src);
 extern char *strcpy(char *dest, const char *src);
 extern int strcmp(const char *a, const char *b);
 extern int strncmp(const char *a, const char *b, size_t n);
 extern char *strchr(const char *s, int c);
+extern char *strrchr(const char *s, int c);
 extern char *strstr(const char *haystack, const char *needle);
 extern void *memset(void *s, int c, size_t n);
 extern void *memcpy(void *dest, const void *src, size_t n);
diff --git a/lib/string.c b/lib/string.c
index 75257f5..9cd626f 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -7,15 +7,24 @@
 
 #include "libcflat.h"
 
-unsigned long strlen(const char *buf)
+size_t strlen(const char *buf)
 {
-    unsigned long len = 0;
+    size_t len = 0;
 
     while (*buf++)
 	++len;
     return len;
 }
 
+size_t strnlen(const char *buf, size_t maxlen)
+{
+    const char *sc;
+
+    for (sc = buf; maxlen-- && *sc != '\0'; ++sc)
+        /* nothing */;
+    return sc - buf;
+}
+
 char *strcat(char *dest, const char *src)
 {
     char *p = dest;
@@ -55,6 +64,16 @@ char *strchr(const char *s, int c)
     return (char *)s;
 }
 
+char *strrchr(const char *s, int c)
+{
+    const char *last = NULL;
+    do {
+        if (*s != (char)c)
+            last = s;
+    } while (*s++);
+    return (char *)last;
+}
+
 char *strstr(const char *s1, const char *s2)
 {
     size_t l1, l2;
-- 
2.25.1