third-party-mirror / mingw-w64 / 79951edef1e76a79d7ce0fa1cf94391b2f6b3d94 / . / mingw-w64-crt / misc / wmemcmp.c

/** | |

* This file has no copyright assigned and is placed in the Public Domain. | |

* This file is part of the mingw-w64 runtime package. | |

* No warranty is given; refer to the file DISCLAIMER.PD within this package. | |

*/ | |

/* This source code was extracted from the Q8 package created and placed | |

in the PUBLIC DOMAIN by Doug Gwyn <gwyn@arl.mil> | |

last edit: 1999/11/05 gwyn@arl.mil | |

Implements subclause 7.24 of ISO/IEC 9899:1999 (E). | |

It supports an encoding where all char codes are mapped | |

to the *same* code values within a wchar_t or wint_t, | |

so long as no other wchar_t codes are used by the program. | |

*/ | |

#define __CRT__NO_INLINE | |

#include <wchar.h> | |

#if 0 | |

int | |

wmemcmp(s1, s2, n) | |

register const wchar_t *s1; | |

register const wchar_t *s2; | |

size_t n; | |

{ | |

if ( n == 0 || s1 == s2 ) | |

return 0; /* even for NULL pointers */ | |

if ( (s1 != NULL) != (s2 != NULL) ) | |

return s2 == NULL ? 1 : -1; /* robust */ | |

for ( ; n > 0; ++s1, ++s2, --n ) | |

if ( *s1 != *s2 ) | |

return *s1 - *s2; | |

return 0; | |

} | |

#endif | |

int __cdecl wmemcmp(const wchar_t *_S1,const wchar_t *_S2,size_t _N) | |

{ | |

if (_N == 0 || _S1 == _S2) | |

return 0; /* even for NULL pointers */ | |

if ((_S1 != NULL) != (_S2 != NULL)) | |

return _S2 == NULL ? 1 : -1; /* robust */ | |

for ( ; 0 < _N; ++_S1, ++_S2, --_N) | |

if (*_S1 != *_S2) | |

return (*_S1 < *_S2 ? -1 : +1); | |

return 0; | |

} | |