1 files changed, 41 insertions, 0 deletions
diff --git a/string.c b/string.c
new file mode 100644
index 0000000..b85b46a
--- /dev/null
+++ b/string.c
@@ -0,0 +1,41 @@
+#include <stdlib.h>
+#include <string.h>
+#include "string.h"
+
+
+struct string string_make(const char *str) {
+  struct string s;
+  s.len = strlen(str);
+  s.cap = s.len + 1;
+  s.data = malloc(s.cap);
+  memcpy(s.data, str, s.cap);
+  return s;
+}
+
+void string_free(struct string s) {
+  free(s.data);
+}
+
+char* string_read(struct string s) {
+  return s.data;
+}
+
+size_t string_append(struct string *s, char *arg) {
+  const size_t arglen = strlen(arg);
+  if (s->len + arglen + 1 > s->cap) {
+    size_t newcap = s->cap * 2;
+    while (s->len + arglen + 1 > newcap) newcap *= 2;
+    s->data = realloc(s->data, newcap);
+  }
+  memcpy(s->data + s->len, arg, arglen + 1);
+  const size_t origlen = s->len;
+  s->len += arglen;
+  return origlen;
+}
+
+void string_truncate(struct string *s, size_t length) {
+  if (length < s->len) {
+    s->len = length;
+    s->data[length] = '\0';
+  }
+}