lnm/src/lnm_utils.c

#include <stdint.h>
#include <string.h>

#include "lnm/common.h"

bool lnm_strneq(const char *s1, size_t s1_len, const char *s2, size_t s2_len) {
  return (s1_len == s2_len) && (memcmp(s1, s2, s1_len) == 0);
}

bool lnm_strnieq(const char *s1, size_t s1_len, const char *s2, size_t s2_len) {
  bool equal = s1_len == s2_len;

  for (size_t i = 0; i < s1_len && equal; i++) {
    equal = s1[i] == s2[i] ||
            (('a' <= s1[i]) && (s1[i] <= 'z') && (s1[i] - 32 == s2[i]));
  }

  return equal;
}

uint64_t lnm_ipow(uint64_t base, uint64_t power) {
  uint64_t res = 1;

  while (power > 0) {
    res *= base;
    power--;
  }

  return res;
}

uint64_t lnm_atoi(const char *s, size_t len) {
  uint64_t res = 0;

  for (size_t i = 0; i < len; i++) {
    if (s[i] < '0' || '9' < s[i]) {
      return 0;
    }

    uint64_t val = s[i] - '0';
    res += val * lnm_ipow(10, (len - 1) - i);
  }

  return res;
}

uint64_t lnm_digits(uint64_t num) {
  int digits = 1;

  while (num > 9) {
    digits++;

    num /= 10;
  }

  return digits;
}