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      1 /***************************************************************************
      2  *                                  _   _ ____  _
      3  *  Project                     ___| | | |  _ \| |
      4  *                             / __| | | | |_) | |
      5  *                            | (__| |_| |  _ <| |___
      6  *                             \___|\___/|_| \_\_____|
      7  *
      8  * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel (at) haxx.se>, et al.
      9  *
     10  * This software is licensed as described in the file COPYING, which
     11  * you should have received as part of this distribution. The terms
     12  * are also available at http://curl.haxx.se/docs/copyright.html.
     13  *
     14  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
     15  * copies of the Software, and permit persons to whom the Software is
     16  * furnished to do so, under the terms of the COPYING file.
     17  *
     18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
     19  * KIND, either express or implied.
     20  *
     21  ***************************************************************************/
     22 
     23 #include "curl_setup.h"
     24 
     25 #include "rawstr.h"
     26 
     27 /* Portable, consistent toupper (remember EBCDIC). Do not use toupper() because
     28    its behavior is altered by the current locale. */
     29 char Curl_raw_toupper(char in)
     30 {
     31   switch (in) {
     32   case 'a':
     33     return 'A';
     34   case 'b':
     35     return 'B';
     36   case 'c':
     37     return 'C';
     38   case 'd':
     39     return 'D';
     40   case 'e':
     41     return 'E';
     42   case 'f':
     43     return 'F';
     44   case 'g':
     45     return 'G';
     46   case 'h':
     47     return 'H';
     48   case 'i':
     49     return 'I';
     50   case 'j':
     51     return 'J';
     52   case 'k':
     53     return 'K';
     54   case 'l':
     55     return 'L';
     56   case 'm':
     57     return 'M';
     58   case 'n':
     59     return 'N';
     60   case 'o':
     61     return 'O';
     62   case 'p':
     63     return 'P';
     64   case 'q':
     65     return 'Q';
     66   case 'r':
     67     return 'R';
     68   case 's':
     69     return 'S';
     70   case 't':
     71     return 'T';
     72   case 'u':
     73     return 'U';
     74   case 'v':
     75     return 'V';
     76   case 'w':
     77     return 'W';
     78   case 'x':
     79     return 'X';
     80   case 'y':
     81     return 'Y';
     82   case 'z':
     83     return 'Z';
     84   }
     85   return in;
     86 }
     87 
     88 /*
     89  * Curl_raw_equal() is for doing "raw" case insensitive strings. This is meant
     90  * to be locale independent and only compare strings we know are safe for
     91  * this.  See http://daniel.haxx.se/blog/2008/10/15/strcasecmp-in-turkish/ for
     92  * some further explanation to why this function is necessary.
     93  *
     94  * The function is capable of comparing a-z case insensitively even for
     95  * non-ascii.
     96  */
     97 
     98 int Curl_raw_equal(const char *first, const char *second)
     99 {
    100   while(*first && *second) {
    101     if(Curl_raw_toupper(*first) != Curl_raw_toupper(*second))
    102       /* get out of the loop as soon as they don't match */
    103       break;
    104     first++;
    105     second++;
    106   }
    107   /* we do the comparison here (possibly again), just to make sure that if the
    108      loop above is skipped because one of the strings reached zero, we must not
    109      return this as a successful match */
    110   return (Curl_raw_toupper(*first) == Curl_raw_toupper(*second));
    111 }
    112 
    113 int Curl_raw_nequal(const char *first, const char *second, size_t max)
    114 {
    115   while(*first && *second && max) {
    116     if(Curl_raw_toupper(*first) != Curl_raw_toupper(*second)) {
    117       break;
    118     }
    119     max--;
    120     first++;
    121     second++;
    122   }
    123   if(0 == max)
    124     return 1; /* they are equal this far */
    125 
    126   return Curl_raw_toupper(*first) == Curl_raw_toupper(*second);
    127 }
    128 
    129 /* Copy an upper case version of the string from src to dest.  The
    130  * strings may overlap.  No more than n characters of the string are copied
    131  * (including any NUL) and the destination string will NOT be
    132  * NUL-terminated if that limit is reached.
    133  */
    134 void Curl_strntoupper(char *dest, const char *src, size_t n)
    135 {
    136   if(n < 1)
    137     return;
    138 
    139   do {
    140     *dest++ = Curl_raw_toupper(*src);
    141   } while(*src++ && --n);
    142 }
    143