#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';
  }
}