find finished

user/ulib.c

@@ -21,12 +21,33 @@ char *strcpy(char *s, const char *t) {
   return os;
 }
 
+char *strncpy(char *s, const char *t, int n) {
+  char *os;
+
+  os = s;
+  if (n <= 0)
+    return os;
+  while (--n > 0 && (*s++ = *t++) != 0)
+    ;
+  while (n-- > 0)
+    *s++ = 0;
+  return os;
+}
+
 int strcmp(const char *p, const char *q) {
   while (*p && *p == *q)
     p++, q++;
   return (uchar)*p - (uchar)*q;
 }
 
+int strncmp(const char *p, const char *q, int n) {
+  while (n > 0 && *p && *p == *q)
+    p++, q++, n--;
+  if (n == 0)
+    return 0;
+  return (uchar)*p - (uchar)*q;
+}
+
 uint strlen(const char *s) {
   int n;