serial experiment works

[rpikern] / src / libc / string.c

diff --git a/src/libc/string.c b/src/libc/string.c
index 19de177..9ffb5ec 100644 (file)
--- a/src/libc/string.c
+++ b/src/libc/string.c
@@ -8,3 +8,27 @@ void *memset(void *ptr, int val, int size)
        }
        return ptr;
 }
+
+void *memcpy(void *dest, void *src, int size)
+{
+       unsigned char *d = dest;
+       unsigned char *s = src;
+       while(size--) {
+               *d++ = *s++;
+       }
+       return dest;
+}
+
+int strcmp(const char *a, const char *b)
+{
+       while(*a && *a == *b) {
+               a++;
+               b++;
+       }
+
+       if(!*a && !*b) return 0;
+
+       if(!*a) return -1;
+       if(!*b) return 1;
+       return *a - *b > 0 ? 1 : -1;
+}