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/strcoll.c | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 70 insertions(+) create mode 100644 string/strcoll.c (limited to 'string/strcoll.c') diff --git a/string/strcoll.c b/string/strcoll.c new file mode 100644 index 0000000000..ed4b35f80d --- /dev/null +++ b/string/strcoll.c @@ -0,0 +1,70 @@ +/* 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 + + +/* Compare S1 and S2, returning less than, equal to or + greater than zero if the collated form of S1 is lexiographically + less than, equal to or greater than the collated form of S2. */ +int +DEFUN(strcoll, (s1, s2), CONST char *s1 AND CONST char *s2) +{ + if (_collate_info == NULL || _collate_info->values == NULL) + return strcmp(s1, s2); + else + { + CONST unsigned char *CONST values = _collate_info->values; + CONST unsigned char *CONST offsets = _collate_info->offsets; + + while (*s1 != '\0' && *s2 != '\0') + { + CONST unsigned char c1 = *s1++, c2 = *s2++; + CONST unsigned char v1 = values[c1], v2 = values[c2]; + CONST unsigned char o1 = offsets[c1], o2 = offsets[c2]; + + if (v1 == UCHAR_MAX && o1 == 0) + /* This is a non-collating element. Skip it. */ + --s2; + else if (v2 == UCHAR_MAX && o2 == 0) + --s1; + else if (v1 == UCHAR_MAX && o1 == CHAR_MAX) + { + /* This element collates lower than anything else. */ + if (v2 != UCHAR_MAX || o2 != CHAR_MAX) + return -1; + } + else if (v2 == UCHAR_MAX && o2 == CHAR_MAX) + return 1; + else if (v1 != v2) + return v1 - v2; + else if (o1 != o2) + return o1 - o2; + } + + if (*s1 == '\0') + return *s2 == '\0' ? 0 : -1; + else if (*s2 == '\0') + return 1; + return 0; + } +} -- cgit v1.2.3