#include <stdbool.h>
#include <stdint.h>
#include <knob/heap.h>

//unsophisticated, should copy by dwords where available
void blockcpy(void *to, const void *from, uint32_t size) {
  for (uint32_t i = 0; i < size; ++i)
    *(uint8_t *)(to++) = *(const uint8_t *)(from++);
}

//unsophisticated, should check by dwords wheere available
__attribute__ ((__pure__))
bool blockequ(const void *a, const void *b, uint32_t size) {
  for (uint32_t i = 0; i < size; ++i)
    if (*(uint8_t *)(a++) != *(uint8_t *)(b++))
      return false;
  return true;
}

//returns length without null-terminator
uint32_t strcpy(char *to, const char *from) {
  uint32_t i = 0;
  do
    to[i] = from[i];
  while (from[i++]);
  return i - 1;
}

char *strdup(const char *from) {
  const char *end = from;
  while (*(end++))
    ;
  char *buf = get_block(end - from);
  blockcpy(buf, from, end - from);
  return buf;
}

__attribute__ ((pure))
bool strequ(const char *a, const char *b) {
  while (true) {
    if ((*a == '\0') != (*b == '\0'))
      return false;
    if (*a == '\0')
      return true;
    if (*a != *b)
      return false;
    ++a;
    ++b;
  }
}

__attribute__ ((pure))
uint32_t strlen(const char *str) {
  uint32_t len = 0;
  while (*str) {
    ++len;
    ++str;
  }
  return len;
}

void str_trunc_fill(char *str, uint32_t len) {
  const uint8_t orig_len = strlen(str);
  if (orig_len > len) {
    str[len - 4] = ' ';
    str[len - 3] = '.';
    str[len - 2] = '.';
    str[len - 1] = '.';
    str[len] = '\0';
  }
  else if (orig_len != len) {
    for (uint8_t j = orig_len; j < len; ++j)
      str[j] = ' ';
    str[len] = '\0';
  }
}