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      1 /*
      2  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
      3  *
      4  *  Use of this source code is governed by a BSD-style license
      5  *  that can be found in the LICENSE file in the root of the source
      6  *  tree. An additional intellectual property rights grant can be found
      7  *  in the file PATENTS.  All contributing project authors may
      8  *  be found in the AUTHORS file in the root of the source tree.
      9  */
     10 
     11 #include "webrtc/base/checks.h"
     12 #include "webrtc/base/stringutils.h"
     13 
     14 namespace rtc {
     15 
     16 bool memory_check(const void* memory, int c, size_t count) {
     17   const char* char_memory = static_cast<const char*>(memory);
     18   char char_c = static_cast<char>(c);
     19   for (size_t i = 0; i < count; ++i) {
     20     if (char_memory[i] != char_c) {
     21       return false;
     22     }
     23   }
     24   return true;
     25 }
     26 
     27 bool string_match(const char* target, const char* pattern) {
     28   while (*pattern) {
     29     if (*pattern == '*') {
     30       if (!*++pattern) {
     31         return true;
     32       }
     33       while (*target) {
     34         if ((toupper(*pattern) == toupper(*target))
     35             && string_match(target + 1, pattern + 1)) {
     36           return true;
     37         }
     38         ++target;
     39       }
     40       return false;
     41     } else {
     42       if (toupper(*pattern) != toupper(*target)) {
     43         return false;
     44       }
     45       ++target;
     46       ++pattern;
     47     }
     48   }
     49   return !*target;
     50 }
     51 
     52 #if defined(WEBRTC_WIN)
     53 int ascii_string_compare(const wchar_t* s1, const char* s2, size_t n,
     54                          CharacterTransformation transformation) {
     55   wchar_t c1, c2;
     56   while (true) {
     57     if (n-- == 0) return 0;
     58     c1 = transformation(*s1);
     59     // Double check that characters are not UTF-8
     60     DCHECK_LT(static_cast<unsigned char>(*s2), 128);
     61     // Note: *s2 gets implicitly promoted to wchar_t
     62     c2 = transformation(*s2);
     63     if (c1 != c2) return (c1 < c2) ? -1 : 1;
     64     if (!c1) return 0;
     65     ++s1;
     66     ++s2;
     67   }
     68 }
     69 
     70 size_t asccpyn(wchar_t* buffer, size_t buflen,
     71                const char* source, size_t srclen) {
     72   if (buflen <= 0)
     73     return 0;
     74 
     75   if (srclen == SIZE_UNKNOWN) {
     76     srclen = strlenn(source, buflen - 1);
     77   } else if (srclen >= buflen) {
     78     srclen = buflen - 1;
     79   }
     80 #if _DEBUG
     81   // Double check that characters are not UTF-8
     82   for (size_t pos = 0; pos < srclen; ++pos)
     83     DCHECK_LT(static_cast<unsigned char>(source[pos]), 128);
     84 #endif  // _DEBUG
     85   std::copy(source, source + srclen, buffer);
     86   buffer[srclen] = 0;
     87   return srclen;
     88 }
     89 
     90 #endif  // WEBRTC_WIN
     91 
     92 void replace_substrs(const char *search,
     93                      size_t search_len,
     94                      const char *replace,
     95                      size_t replace_len,
     96                      std::string *s) {
     97   size_t pos = 0;
     98   while ((pos = s->find(search, pos, search_len)) != std::string::npos) {
     99     s->replace(pos, search_len, replace, replace_len);
    100     pos += replace_len;
    101   }
    102 }
    103 
    104 bool starts_with(const char *s1, const char *s2) {
    105   return strncmp(s1, s2, strlen(s2)) == 0;
    106 }
    107 
    108 bool ends_with(const char *s1, const char *s2) {
    109   size_t s1_length = strlen(s1);
    110   size_t s2_length = strlen(s2);
    111 
    112   if (s2_length > s1_length) {
    113     return false;
    114   }
    115 
    116   const char* start = s1 + (s1_length - s2_length);
    117   return strncmp(start, s2, s2_length) == 0;
    118 }
    119 
    120 static const char kWhitespace[] = " \n\r\t";
    121 
    122 std::string string_trim(const std::string& s) {
    123   std::string::size_type first = s.find_first_not_of(kWhitespace);
    124   std::string::size_type last  = s.find_last_not_of(kWhitespace);
    125 
    126   if (first == std::string::npos || last == std::string::npos) {
    127     return std::string("");
    128   }
    129 
    130   return s.substr(first, last - first + 1);
    131 }
    132 
    133 }  // namespace rtc
    134