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57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
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/*
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FUNCTION
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<<wcsncasecmp_l>>---case-insensitive wide character string compare
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INDEX
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wcsncasecmp_l
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ANSI_SYNOPSIS
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#include <wchar.h>
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int wcsncasecmp_l(const wchar_t *<[a]>, const wchar_t * <[b]>,
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size_t <[length]>, locale_t <[locale]>);
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DESCRIPTION
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<<wcsncasecmp_l>> compares up to <[length]> wide characters
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from the string at <[a]> to the string at <[b]> in a
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case-insensitive manner.
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if <[locale]> is LC_GLOBAL_LOCALE or not a valid locale object, the
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behaviour is undefined.
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RETURNS
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If <<*<[a]>>> sorts lexicographically after <<*<[b]>>> (after
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both are converted to uppercase), <<wcsncasecmp_l>> returns a
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number greater than zero. If the two strings are equivalent,
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<<wcsncasecmp_l>> returns zero. If <<*<[a]>>> sorts
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lexicographically before <<*<[b]>>>, <<wcsncasecmp_l>> returns a
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number less than zero.
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PORTABILITY
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POSIX-1.2008
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<<wcsncasecmp_l>> requires no supporting OS subroutines. It uses
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tolower() from elsewhere in this library.
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QUICKREF
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wcsncasecmp_l
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*/
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#include <wchar.h>
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#include <wctype.h>
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int
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wcsncasecmp_l (const wchar_t *s1, const wchar_t *s2, size_t n,
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struct __locale_t *locale)
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{
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int d = 0;
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for ( ; n != 0; n--)
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{
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const int c1 = towlower_l (*s1++, locale);
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const int c2 = towlower_l (*s2++, locale);
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if (((d = c1 - c2) != 0) || (c2 == '\0'))
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break;
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}
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return d;
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}
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