Franz Pucher / Mbed 2 deprecated ESP8266_HTTP_MQTT_Server

M0 communication to configurable-Web-Server (MQTT) Version 0.1

Dependencies:   LM75B mbed

Siehe auch FTKL-Tagung 2016

String.cpp@3:c14eb9159a88, 2018-01-16 (annotated)

Committer:
fpucher
Date:
Tue Jan 16 13:34:44 2018 +0000
Revision:
3:c14eb9159a88
Parent:
2:63135b94c898 
M3-ESP8266-Communication

Who changed what in which revision?

UserRevisionLine numberNew contents of line
fpucher 2:63135b94c898 1 #include <stdio.h>
fpucher 2:63135b94c898 2 //#include <mem.h>
fpucher 2:63135b94c898 3 #include <string.h>
fpucher 2:63135b94c898 4 //#include <iostream.h>
fpucher 2:63135b94c898 5
fpucher 2:63135b94c898 6 /*
fpucher 2:63135b94c898 7 Caveats in this class are I do not deal with UNICODE text or any type of extended ascii text. For example this class can not handle
fpucher 2:63135b94c898 8 double byte strings as you would encounter in the far east languages or arabic alphabet which is bidirectional.
fpucher 2:63135b94c898 9 I also do not provide extensive error checking for parameters. If you pass null for the sz in the constructor below the code GPFs.
fpucher 2:63135b94c898 10 Doing any operator like = or > on an empty string will result in predictable but disastrous results like GPF. I could instead make it
fpucher 2:63135b94c898 11 return something but it's better to GPF than fail in benign way and not let the caller know about it. It will hide a potential bug in
fpucher 2:63135b94c898 12 callers code which might have other side effects that won't as obvious as the GPF this produces. If you want to use this code for
fpucher 2:63135b94c898 13 a class libarary where you may not have control over the callers actions, you need to make it fail benignly and have an error mechanism
fpucher 2:63135b94c898 14 or have it throw exceptions. You can also assert. But it's always better to deal with the exception than to simply assert.
fpucher 2:63135b94c898 15 */
fpucher 2:63135b94c898 16
fpucher 2:63135b94c898 17 class String
fpucher 2:63135b94c898 18 {
fpucher 2:63135b94c898 19 private:
fpucher 2:63135b94c898 20 // Added const member only to demonstrate initialization of const members.
fpucher 2:63135b94c898 21 const int m_cchTest;
fpucher 2:63135b94c898 22 // length of the string
fpucher 2:63135b94c898 23 int m_cch;
fpucher 2:63135b94c898 24 // null terminated string. Makes it easy to give out null terminated strings.
fpucher 2:63135b94c898 25 char *m_pch;
fpucher 2:63135b94c898 26
fpucher 2:63135b94c898 27 // Technique 56
fpucher 2:63135b94c898 28 void InitString(const char *pch, int cch);
fpucher 2:63135b94c898 29 void Append(const char *pch, int cch);
fpucher 2:63135b94c898 30 void ReinitString(const char *pch, int cch);
fpucher 2:63135b94c898 31 public:
fpucher 2:63135b94c898 32 // Technique 69
fpucher 2:63135b94c898 33 // Technique 70
fpucher 2:63135b94c898 34 // Technique 91
fpucher 2:63135b94c898 35 String(void) : m_cch(0), m_cchTest(10)
fpucher 2:63135b94c898 36 {
fpucher 2:63135b94c898 37 m_pch =NULL;
fpucher 2:63135b94c898 38 // Technique 71
fpucher 2:63135b94c898 39 // m_cchTest = 10; Not OK
fpucher 2:63135b94c898 40 }
fpucher 2:63135b94c898 41
fpucher 2:63135b94c898 42 // Technique 94
fpucher 2:63135b94c898 43 String(const String &string): m_cchTest(10)
fpucher 2:63135b94c898 44 {
fpucher 2:63135b94c898 45 InitString(string.m_pch, string.m_cch);
fpucher 2:63135b94c898 46 }
fpucher 2:63135b94c898 47
fpucher 2:63135b94c898 48 String(char *sz): m_cchTest(10)
fpucher 2:63135b94c898 49 {
fpucher 2:63135b94c898 50 InitString(sz, strlen(sz));
fpucher 2:63135b94c898 51 }
fpucher 2:63135b94c898 52
fpucher 2:63135b94c898 53 ~String(void)
fpucher 2:63135b94c898 54 {
fpucher 2:63135b94c898 55 // Technique 50
fpucher 2:63135b94c898 56 if(m_pch)
fpucher 2:63135b94c898 57 delete m_pch;
fpucher 2:63135b94c898 58 }
fpucher 2:63135b94c898 59
fpucher 2:63135b94c898 60 char & operator[](int i)
fpucher 2:63135b94c898 61 {
fpucher 2:63135b94c898 62 // if i < 0 or >= cch then it will cause access violation just like normal arrays.
fpucher 2:63135b94c898 63 return m_pch[i];
fpucher 2:63135b94c898 64 }
fpucher 2:63135b94c898 65
fpucher 2:63135b94c898 66 const char& operator[](int i) const
fpucher 2:63135b94c898 67 {
fpucher 2:63135b94c898 68 // if i < 0 or >= cch then it will cause access violation just like normal arrays.
fpucher 2:63135b94c898 69 return m_pch[i];
fpucher 2:63135b94c898 70 }
fpucher 2:63135b94c898 71
fpucher 2:63135b94c898 72 // Technique 77
fpucher 2:63135b94c898 73 const String& operator=(const String &string)
fpucher 2:63135b94c898 74 {
fpucher 2:63135b94c898 75 // Technique 78
fpucher 2:63135b94c898 76 if(&string != this)
fpucher 2:63135b94c898 77 ReinitString(string.m_pch, string.m_cch);
fpucher 2:63135b94c898 78 return *this;
fpucher 2:63135b94c898 79 }
fpucher 2:63135b94c898 80
fpucher 2:63135b94c898 81 const String& operator=(const char *sz)
fpucher 2:63135b94c898 82 {
fpucher 2:63135b94c898 83 ReinitString(sz, strlen(sz));
fpucher 2:63135b94c898 84 return *this;
fpucher 2:63135b94c898 85 }
fpucher 2:63135b94c898 86
fpucher 2:63135b94c898 87 const String& operator+=(const String& string)
fpucher 2:63135b94c898 88 {
fpucher 2:63135b94c898 89 Append(string.m_pch, string.m_cch);
fpucher 2:63135b94c898 90 return *this;
fpucher 2:63135b94c898 91 }
fpucher 2:63135b94c898 92
fpucher 2:63135b94c898 93 const String& operator+=(const char *sz)
fpucher 2:63135b94c898 94 {
fpucher 2:63135b94c898 95 Append(sz, strlen(sz));
fpucher 2:63135b94c898 96 return *this;
fpucher 2:63135b94c898 97 }
fpucher 2:63135b94c898 98
fpucher 2:63135b94c898 99 int operator==(const String& string) const
fpucher 2:63135b94c898 100 {
fpucher 2:63135b94c898 101 return(strcmp(m_pch, string.m_pch) == 0);
fpucher 2:63135b94c898 102 }
fpucher 2:63135b94c898 103
fpucher 2:63135b94c898 104 int operator==(const char *sz) const
fpucher 2:63135b94c898 105 {
fpucher 2:63135b94c898 106 return(strcmp(m_pch, sz) == 0);
fpucher 2:63135b94c898 107 }
fpucher 2:63135b94c898 108
fpucher 2:63135b94c898 109 int operator>(const String& string) const
fpucher 2:63135b94c898 110 {
fpucher 2:63135b94c898 111 return(strcmp(m_pch, string.m_pch) > 0);
fpucher 2:63135b94c898 112 }
fpucher 2:63135b94c898 113
fpucher 2:63135b94c898 114 int operator>(const char *sz) const
fpucher 2:63135b94c898 115 {
fpucher 2:63135b94c898 116 return(strcmp(m_pch, sz) > 0);
fpucher 2:63135b94c898 117 }
fpucher 2:63135b94c898 118
fpucher 2:63135b94c898 119 int operator<(const String& string) const
fpucher 2:63135b94c898 120 {
fpucher 2:63135b94c898 121 return(strcmp(m_pch, string.m_pch) < 0);
fpucher 2:63135b94c898 122 }
fpucher 2:63135b94c898 123
fpucher 2:63135b94c898 124 int operator<(const char *sz) const
fpucher 2:63135b94c898 125 {
fpucher 2:63135b94c898 126 return(strcmp(m_pch, sz) < 0);
fpucher 2:63135b94c898 127 }
fpucher 2:63135b94c898 128
fpucher 2:63135b94c898 129 // Technique 53
fpucher 2:63135b94c898 130 #ifdef CODE_GPF
fpucher 2:63135b94c898 131 String &operator+(const String&string) const
fpucher 2:63135b94c898 132 {
fpucher 2:63135b94c898 133 String stringNew(m_pch);
fpucher 2:63135b94c898 134
fpucher 2:63135b94c898 135 stringNew.Append(string.m_pch, string.m_cch);
fpucher 2:63135b94c898 136 return stringNew;
fpucher 2:63135b94c898 137 }
fpucher 2:63135b94c898 138 #endif
fpucher 2:63135b94c898 139
fpucher 2:63135b94c898 140 String operator+(const String&string) const
fpucher 2:63135b94c898 141 {
fpucher 2:63135b94c898 142 String stringNew(m_pch);
fpucher 2:63135b94c898 143
fpucher 2:63135b94c898 144 stringNew.Append(string.m_pch, string.m_cch);
fpucher 2:63135b94c898 145 return stringNew;
fpucher 2:63135b94c898 146 }
fpucher 2:63135b94c898 147 };
fpucher 2:63135b94c898 148
fpucher 2:63135b94c898 149 // Technique 56
fpucher 2:63135b94c898 150 void String::InitString(const char * pch, int cch)
fpucher 2:63135b94c898 151 {
fpucher 2:63135b94c898 152 m_cch = 0;
fpucher 2:63135b94c898 153 m_pch = NULL;
fpucher 2:63135b94c898 154 if(cch)
fpucher 2:63135b94c898 155 {
fpucher 2:63135b94c898 156 m_pch = new char[cch+1];
fpucher 2:63135b94c898 157 if(m_pch)
fpucher 2:63135b94c898 158 {
fpucher 2:63135b94c898 159 strcpy(m_pch, pch);
fpucher 2:63135b94c898 160 m_cch = cch;
fpucher 2:63135b94c898 161 }
fpucher 2:63135b94c898 162 }
fpucher 2:63135b94c898 163 }
fpucher 2:63135b94c898 164
fpucher 2:63135b94c898 165 void String::Append(const char *pch, int cch)
fpucher 2:63135b94c898 166 {
fpucher 2:63135b94c898 167 char *pchNew;
fpucher 2:63135b94c898 168 int cchNew;
fpucher 2:63135b94c898 169
fpucher 2:63135b94c898 170
fpucher 2:63135b94c898 171 // Technique 18
fpucher 2:63135b94c898 172 // Technique 79
fpucher 2:63135b94c898 173 if(!cch)
fpucher 2:63135b94c898 174 return;
fpucher 2:63135b94c898 175 if(!m_pch)
fpucher 2:63135b94c898 176 {
fpucher 2:63135b94c898 177 // If this is empty string, then just initialize it with this string.
fpucher 2:63135b94c898 178 InitString(pch, cch);
fpucher 2:63135b94c898 179 return;
fpucher 2:63135b94c898 180 }
fpucher 2:63135b94c898 181 // Allocate an extra character for the null terminator at the end
fpucher 2:63135b94c898 182 cchNew = m_cch + cch;
fpucher 2:63135b94c898 183 pchNew = new char[cchNew + 1];
fpucher 2:63135b94c898 184
fpucher 2:63135b94c898 185 // Technique 49
fpucher 2:63135b94c898 186 if(!pchNew)
fpucher 2:63135b94c898 187 return;
fpucher 2:63135b94c898 188 // Successfully allocated new buffer
fpucher 2:63135b94c898 189 strcpy(pchNew, m_pch);
fpucher 2:63135b94c898 190
fpucher 2:63135b94c898 191 // Technique 128
fpucher 2:63135b94c898 192 strcpy(pchNew+m_cch, pch);
fpucher 2:63135b94c898 193 if(m_pch)
fpucher 2:63135b94c898 194 delete m_pch;
fpucher 2:63135b94c898 195 m_pch = pchNew;
fpucher 2:63135b94c898 196 m_cch = cchNew;
fpucher 2:63135b94c898 197 }
fpucher 2:63135b94c898 198
fpucher 2:63135b94c898 199 void String::ReinitString(const char *pch, int cch)
fpucher 2:63135b94c898 200 {
fpucher 2:63135b94c898 201 char *pchOld;
fpucher 2:63135b94c898 202 int cchOld;
fpucher 2:63135b94c898 203
fpucher 2:63135b94c898 204
fpucher 2:63135b94c898 205 if(cch != m_cch)
fpucher 2:63135b94c898 206 {
fpucher 2:63135b94c898 207 pchOld = m_pch;
fpucher 2:63135b94c898 208 cchOld = m_cch;
fpucher 2:63135b94c898 209 InitString(pch, cch);
fpucher 2:63135b94c898 210 if(m_pch)
fpucher 2:63135b94c898 211 {
fpucher 2:63135b94c898 212 // Successfully Inited the string? Now we can delete the memory for the old pch if there was one.
fpucher 2:63135b94c898 213 if(pchOld)
fpucher 2:63135b94c898 214 delete pchOld;
fpucher 2:63135b94c898 215 }
fpucher 2:63135b94c898 216 else
fpucher 2:63135b94c898 217 {
fpucher 2:63135b94c898 218 // Failed to allocate space for the string? Restore the old values.
fpucher 2:63135b94c898 219 m_pch = pchOld;
fpucher 2:63135b94c898 220 m_cch = cchOld;
fpucher 2:63135b94c898 221 }
fpucher 2:63135b94c898 222 }
fpucher 2:63135b94c898 223 else
fpucher 2:63135b94c898 224 {
fpucher 2:63135b94c898 225 // If the length of the sting is the same, then no need to reallocate the buffer.
fpucher 2:63135b94c898 226 strcpy(m_pch, pch);
fpucher 2:63135b94c898 227 }
fpucher 2:63135b94c898 228 }
fpucher 2:63135b94c898 229 void PrintConstString(const String &string)
fpucher 2:63135b94c898 230 {
fpucher 2:63135b94c898 231 int i = 0;
fpucher 2:63135b94c898 232 while(string[i])
fpucher 2:63135b94c898 233 {
fpucher 2:63135b94c898 234 //cout << string[i];
fpucher 2:63135b94c898 235 // Technique 80
fpucher 2:63135b94c898 236 // NOCOMPILE the following won't compile if you remove the comments.
fpucher 2:63135b94c898 237 // string[i] = ' ';
fpucher 2:63135b94c898 238 i++;
fpucher 2:63135b94c898 239 }
fpucher 2:63135b94c898 240 //cout << '\n';
fpucher 2:63135b94c898 241 }
fpucher 2:63135b94c898 242
fpucher 2:63135b94c898 243 void PrintString(String &string)
fpucher 2:63135b94c898 244 {
fpucher 2:63135b94c898 245 int i = 0;
fpucher 2:63135b94c898 246 while(string[i])
fpucher 2:63135b94c898 247 {
fpucher 2:63135b94c898 248 //cout << string[i];
fpucher 2:63135b94c898 249 // Unlike above this compiles.
fpucher 2:63135b94c898 250 string[i] = ' ';
fpucher 2:63135b94c898 251 i++;
fpucher 2:63135b94c898 252 }
fpucher 2:63135b94c898 253 }
fpucher 2:63135b94c898 254
fpucher 2:63135b94c898 255 void TestStringClass(void)
fpucher 2:63135b94c898 256 {
fpucher 2:63135b94c898 257 String string("Test");
fpucher 2:63135b94c898 258 String string1(string);
fpucher 2:63135b94c898 259 String string2;
fpucher 2:63135b94c898 260
fpucher 2:63135b94c898 261
fpucher 2:63135b94c898 262 string1 = "Test1";
fpucher 2:63135b94c898 263 string1 += string;
fpucher 2:63135b94c898 264 string ="zing";
fpucher 2:63135b94c898 265 // Technique 105
fpucher 2:63135b94c898 266 PrintConstString(string);
fpucher 2:63135b94c898 267
fpucher 2:63135b94c898 268 if(string1 == string)
fpucher 2:63135b94c898 269 string1 = "equal";
fpucher 2:63135b94c898 270 else if(string1 < string)
fpucher 2:63135b94c898 271 string1 = "less";
fpucher 2:63135b94c898 272 else
fpucher 2:63135b94c898 273 string1 = "greater";
fpucher 2:63135b94c898 274 PrintConstString(string);
fpucher 2:63135b94c898 275 PrintConstString(string1);
fpucher 2:63135b94c898 276 string2 = string + string1;
fpucher 2:63135b94c898 277 PrintConstString(string2);
fpucher 2:63135b94c898 278 }
fpucher 2:63135b94c898 279