#include <ctype.h>
#include <inttypes.h>
#include <limits.h>

#include "intscan.h"
#include "libc.h"
#include "shgetc.h"
#include "stdio_impl.h"

static unsigned long long strtox(const char* s, char** p, int base, unsigned long long lim) {
  /* FIXME: use a helper function or macro to setup the FILE */
  FILE f;
  f.flags = 0;
  f.buf = f.rpos = (void*)s;
  if ((size_t)s > (size_t)-1 / 2)
    f.rend = (void*)-1;
  else
    f.rend = (unsigned char*)s + (size_t)-1 / 2;
  f.lock = -1;
  shlim(&f, 0);
  unsigned long long y = __intscan(&f, base, 1, lim);
  if (p) {
    size_t cnt = shcnt(&f);
    *p = (char*)s + cnt;
  }
  return y;
}

unsigned long long strtoull(const char* restrict s, char** restrict p, int base) {
  return strtox(s, p, base, ULLONG_MAX);
}

long long strtoll(const char* restrict s, char** restrict p, int base) {
  return strtox(s, p, base, LLONG_MIN);
}

unsigned long strtoul(const char* restrict s, char** restrict p, int base) {
  return strtox(s, p, base, ULONG_MAX);
}

long strtol(const char* restrict s, char** restrict p, int base) {
  return strtox(s, p, base, 0UL + LONG_MIN);
}

intmax_t strtoimax(const char* restrict s, char** restrict p, int base) {
  return strtoll(s, p, base);
}

uintmax_t strtoumax(const char* restrict s, char** restrict p, int base) {
  return strtoull(s, p, base);
}