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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 
memory_check(const void * memory,int c,size_t count)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 
string_match(const char * target,const char * pattern)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)
ascii_string_compare(const wchar_t * s1,const char * s2,size_t n,CharacterTransformation transformation)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     RTC_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 
asccpyn(wchar_t * buffer,size_t buflen,const char * source,size_t srclen)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 !defined(NDEBUG)
81   // Double check that characters are not UTF-8
82   for (size_t pos = 0; pos < srclen; ++pos)
83     RTC_DCHECK_LT(static_cast<unsigned char>(source[pos]), 128);
84 #endif
85   std::copy(source, source + srclen, buffer);
86   buffer[srclen] = 0;
87   return srclen;
88 }
89 
90 #endif  // WEBRTC_WIN
91 
replace_substrs(const char * search,size_t search_len,const char * replace,size_t replace_len,std::string * s)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 
starts_with(const char * s1,const char * s2)104 bool starts_with(const char *s1, const char *s2) {
105   return strncmp(s1, s2, strlen(s2)) == 0;
106 }
107 
ends_with(const char * s1,const char * s2)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 
string_trim(const std::string & s)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