add strrchr() implementation

bediger4000 · May 11, 2017 · 2491806 · 2491806
1 parent 1b99ff7
commit 2491806
Show file tree

Hide file tree

Showing 2 changed files with 19 additions and 0 deletions.
diff --git a/libstatic/libstatic.h b/libstatic/libstatic.h
@@ -24,6 +24,7 @@ void linux_brk(unsigned long addr);
 
 unsigned long strlen(const char *s);
 char *strchr(const char *s, int c);
+char *strrchr(const char *s, int c);
 char *strstr(const char *str, char *substr);
 void *memcpy(void *dest, const void *src, unsigned long n);
 char *strcat(char *dest, const char *src);

diff --git a/libstatic/string.c b/libstatic/string.c
@@ -23,6 +23,24 @@ char *strchr(const char *s, int c)
 	return r;
 }
 
+char *strrchr(const char *s, int c)
+{
+	char *r = NULL;
+	char *p;
+
+	p = &s[strlen(s)-1];
+
+	for (; p != s; --p)
+	{
+		if (*p == c)
+		{
+			r = (char *)p;
+			break;
+		}
+	}
+	return r;
+}
+
 char *
 strcat(char *dest, const char *src)
 {