Add cfw_strndup().

src/string.c

@@ -58,6 +58,28 @@ cfw_strdup(const char *s)
 	return copy;
 }
 
+char*
+cfw_strndup(const char *s, size_t max)
+{
+	char *copy;
+	size_t len;
+
+	len = strlen(s);
+
+	if (len > max)
+		len = max;
+
+	if ((copy = malloc(len + 1)) == NULL) {
+		errno = ENOMEM;
+		return NULL;
+	}
+
+	memcpy(copy, s, len);
+	copy[len] = 0;
+
+	return copy;
+}
+
 static bool
 ctor(void *ptr, va_list args)
 {

src/string.h

@@ -33,6 +33,7 @@
 typedef struct CFWString CFWString;
 extern CFWClass *cfw_string;
 extern char* cfw_strdup(const char*);
+extern char* cfw_strndup(const char*, size_t);
 extern const char* cfw_string_c(CFWString*);
 extern size_t cfw_string_length(CFWString*);
 extern bool cfw_string_set(CFWString*, const char*);