| /* |
| FUNCTION |
| <<wcsncasecmp>>---case-insensitive wide character string compare |
| |
| INDEX |
| wcsncasecmp |
| |
| ANSI_SYNOPSIS |
| #include <wchar.h> |
| int wcsncasecmp(const wchar_t *<[a]>, const wchar_t * <[b]>, size_t <[length]>); |
| |
| TRAD_SYNOPSIS |
| #include <wchar.h> |
| int wcsncasecmp(<[a]>, <[b]>, <[length]>) |
| wchar_t *<[a]>; |
| wchar_t *<[b]>; |
| size_t <[length]> |
| |
| DESCRIPTION |
| <<wcsncasecmp>> compares up to <[length]> wide characters |
| from the string at <[a]> to the string at <[b]> in a |
| case-insensitive manner. |
| |
| RETURNS |
| |
| If <<*<[a]>>> sorts lexicographically after <<*<[b]>>> (after |
| both are converted to uppercase), <<wcsncasecmp>> returns a |
| number greater than zero. If the two strings are equivalent, |
| <<wcsncasecmp>> returns zero. If <<*<[a]>>> sorts |
| lexicographically before <<*<[b]>>>, <<wcsncasecmp>> returns a |
| number less than zero. |
| |
| PORTABILITY |
| POSIX-1.2008 |
| |
| <<wcsncasecmp>> requires no supporting OS subroutines. It uses |
| tolower() from elsewhere in this library. |
| |
| QUICKREF |
| wcsncasecmp |
| */ |
| |
| #include <wchar.h> |
| #include <wctype.h> |
| |
| int |
| _DEFUN (wcsncasecmp, (s1, s2, n), |
| _CONST wchar_t *s1 _AND |
| _CONST wchar_t *s2 _AND |
| size_t n) |
| { |
| if (n == 0) |
| return 0; |
| |
| while (n-- != 0 && towlower(*s1) == towlower(*s2)) |
| { |
| if (n == 0 || *s1 == '\0' || *s2 == '\0') |
| break; |
| s1++; |
| s2++; |
| } |
| |
| return towlower(*s1) - towlower(*s2); |
| } |