From 28f540f45bbacd939bfd07f213bcad2bf730b1bf Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Sat, 18 Feb 1995 01:27:10 +0000 Subject: initial import --- string/strxfrm.c | 76 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 76 insertions(+) create mode 100644 string/strxfrm.c (limited to 'string/strxfrm.c') diff --git a/string/strxfrm.c b/string/strxfrm.c new file mode 100644 index 0000000000..cdca280e78 --- /dev/null +++ b/string/strxfrm.c @@ -0,0 +1,76 @@ +/* Copyright (C) 1991 Free Software Foundation, Inc. +This file is part of the GNU C Library. + +The GNU C Library is free software; you can redistribute it and/or +modify it under the terms of the GNU Library General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version. + +The GNU C Library is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +#include +#include +#include +#include +#include + + +/* Transform SRC into a form such that the result of strcmp + on two strings that have been transformed by strxfrm is + the same as the result of strcoll on the two strings before + their transformation. The transformed string is put in at + most N characters of DEST and its length is returned. */ +size_t +DEFUN(strxfrm, (dest, src, n), char *dest AND CONST char *src AND size_t n) +{ + CONST unsigned char *CONST values + = _collate_info != NULL ? _collate_info->values : NULL; + CONST unsigned char *CONST offsets + = _collate_info != NULL ? _collate_info->offsets : NULL; + register size_t done = 0; + + while (*src != '\0') + { + CONST unsigned char c = *src++; + + ++done; + if (offsets != NULL && offsets[c] != 0) + { + ++done; + if (offsets[c] == CHAR_MAX) + ++done; + } + if (done < n && dest != NULL) + { + if (values == NULL) + *dest++ = c; + else if (values[c] == UCHAR_MAX && offsets[c] == 0) + /* This is a non-collating element. Skip it. */ + ; + else if (values[c] == UCHAR_MAX && offsets[c] == CHAR_MAX) + { + /* This element collates lower than anything else. */ + *dest++ = '\001'; + *dest++ = '\001'; + *dest++ = '\001'; + } + else + { + *dest++ = values[c]; + *dest++ = offsets[c]; + } + } + } + + if (dest != NULL) + *dest = '\0'; + return done; +} -- cgit v1.2.3