c_func.hpp

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#ifndef GLIM_STRING_HPP_
#define GLIM_STRING_HPP_

/// Rare, but useful, string functions.
/// @file

namespace glim {

/**
 * Copy src into dest, returing a pointer to the last updated character of the dest.
 * If the length of the src is bigger then len, then only the len - 1 characters are copied into the dest.
 * The dest is always null-terminated, therefore returning pointer always points to the terminator.
 */
template <typename CHAR>
char* stpncpy (CHAR* dest, CHAR const* src, int len) {
  --len;
  while (len > 0 && *src != 0) {*dest++ = *src++; --len;}
  *dest = 0;
  return dest;
};

/**
 * Convert an integer to a decimal string.
 * Returns a pointer to the end of the dest, just like stpcpy.
 * @bug does not work well with very big integers.
 */
template <typename INT>
char* itoa (char* dest, INT i) {
  if (!i) {*dest++ = '0'; *dest = 0; return dest;}
  bool sign; if (i < 0) {i *= -1; sign = true;} else {sign = false;}
  int8_t len = 0; INT z = i; while (z != 0) {++len; z /= 10;}
  if (sign) ++len; char* p = dest + len; *p = 0;

  do {*--p = (i % 10) + '0'; i /= 10;} while (i);
  if (sign) *--p = '-'; return dest + len;
};

} // namespace glim

#endif // GLIM_STRING_HPP_

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