138 lines
3.3 KiB
C
138 lines
3.3 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at http://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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***************************************************************************/
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/* These functions are borrowed from libcurl's lib/rawstr.c with minor
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* modifications to style and naming. Curl_raw_equal and Curl_raw_nequal are
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* further modified to be true cmp style functions, returning negative, zero,
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* or positive. */
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#include <stdlib.h>
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#include "util.h"
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/* Portable, consistent toupper (remember EBCDIC). Do not use toupper() because
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its behavior is altered by the current locale. */
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static char raw_toupper(char in)
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{
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switch(in) {
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case 'a':
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return 'A';
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case 'b':
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return 'B';
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case 'c':
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return 'C';
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case 'd':
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return 'D';
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case 'e':
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return 'E';
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case 'f':
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return 'F';
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case 'g':
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return 'G';
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case 'h':
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return 'H';
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case 'i':
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return 'I';
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case 'j':
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return 'J';
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case 'k':
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return 'K';
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case 'l':
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return 'L';
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case 'm':
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return 'M';
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case 'n':
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return 'N';
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case 'o':
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return 'O';
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case 'p':
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return 'P';
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case 'q':
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return 'Q';
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case 'r':
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return 'R';
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case 's':
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return 'S';
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case 't':
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return 'T';
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case 'u':
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return 'U';
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case 'v':
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return 'V';
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case 'w':
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return 'W';
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case 'x':
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return 'X';
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case 'y':
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return 'Y';
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case 'z':
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return 'Z';
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}
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return in;
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}
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/*
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* _alpm_raw_cmp() is for doing "raw" case insensitive strings. This is meant
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* to be locale independent and only compare strings we know are safe for
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* this. See http://daniel.haxx.se/blog/2008/10/15/strcasecmp-in-turkish/ for
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* some further explanation to why this function is necessary.
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*
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* The function is capable of comparing a-z case insensitively even for
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* non-ascii.
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*/
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int _alpm_raw_cmp(const char *first, const char *second)
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{
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while(*first && *second) {
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if(raw_toupper(*first) != raw_toupper(*second)) {
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/* get out of the loop as soon as they don't match */
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break;
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}
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first++;
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second++;
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}
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/* we do the comparison here (possibly again), just to make sure that if the
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loop above is skipped because one of the strings reached zero, we must not
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return this as a successful match */
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return (raw_toupper(*first) - raw_toupper(*second));
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}
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int _alpm_raw_ncmp(const char *first, const char *second, size_t max)
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{
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while(*first && *second && max) {
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if(raw_toupper(*first) != raw_toupper(*second)) {
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break;
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}
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max--;
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first++;
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second++;
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}
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if(0 == max) {
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/* they are equal this far */
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return 0;
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}
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return (raw_toupper(*first) - raw_toupper(*second));
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}
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/* vim: set noet: */
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