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77 lines
2.2 KiB
C
77 lines
2.2 KiB
C
/* Copyright (C) 1991 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <localeinfo.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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/* Transform SRC into a form such that the result of strcmp
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on two strings that have been transformed by strxfrm is
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the same as the result of strcoll on the two strings before
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their transformation. The transformed string is put in at
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most N characters of DEST and its length is returned. */
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size_t
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DEFUN(strxfrm, (dest, src, n), char *dest AND CONST char *src AND size_t n)
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{
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CONST unsigned char *CONST values
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= _collate_info != NULL ? _collate_info->values : NULL;
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CONST unsigned char *CONST offsets
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= _collate_info != NULL ? _collate_info->offsets : NULL;
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register size_t done = 0;
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while (*src != '\0')
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{
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CONST unsigned char c = *src++;
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++done;
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if (offsets != NULL && offsets[c] != 0)
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{
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++done;
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if (offsets[c] == CHAR_MAX)
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++done;
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}
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if (done < n && dest != NULL)
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{
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if (values == NULL)
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*dest++ = c;
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else if (values[c] == UCHAR_MAX && offsets[c] == 0)
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/* This is a non-collating element. Skip it. */
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;
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else if (values[c] == UCHAR_MAX && offsets[c] == CHAR_MAX)
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{
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/* This element collates lower than anything else. */
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*dest++ = '\001';
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*dest++ = '\001';
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*dest++ = '\001';
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}
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else
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{
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*dest++ = values[c];
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*dest++ = offsets[c];
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}
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}
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}
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if (dest != NULL)
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*dest = '\0';
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return done;
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}
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