libs/string.cpp

   1 #include "string.h"
   2
   3 string::string(char *text) {
   4         data = new char[strlen(text)];
   5 }
   6
   7 string::string() : data((char*)0) {}
   8
   9 string::~string() {
  10         if (data)
  11                 delete data;
  12 }
  13
  14 int string::length() const {
  15         return strlen(data);
  16 }
  17
  18 char &string::operator[](int index) {
  19         if (index < length())
  20                 return data[index];
  21         else
  22                 return error;
  23 }
  24
  25 bool string::operator==(char *x) {
  26         if (!strcmp(data, x))
  27                 return true;
  28         else
  29                 return false;
  30 }
  31
  32 bool string::operator==(string &x) {
  33         if (!strcmp(data, x.data))
  34                 return true;
  35         else
  36                 return false;
  37 }
  38
  39 string::operator char*() {
  40         return data;
  41 }
  42
  43 int strlen(const char *a) {
  44         int i;
  45         for (i = 0; a[i]; i++);
  46         return i + 1;
  47 }
  48
  49 int strcmp(const char *a,const char *b) {
  50         int i;
  51         for (i = 0; a[i] && b[i] && a[i] == b[i]; i++);
  52         if (a[i] != b[i]) return 1;
  53         return 0;
  54 }
  55
  56 int strncmp(const char *a,const char *b, int n) {
  57         int i;
  58         for (i = 0; a[i] && b[i] && a[i] == b[i] && i < n; i++);
  59         if (a[i] != b[i] && i != n) return 1;
  60         return 0;
  61 }
  62
  63 char *strcat(char *a, const char *b) {
  64         return strcpy(&(a[strlen(a)]), b);
  65 }
  66
  67 char *strcpy(char *a, const char *b) {
  68         return (char*)memcpy((void*)a, (const void *)b, strlen(b));
  69 }
  70
  71 void *memcpy(void * a, const void * b, int count) {
  72         for (int i = 0; i < count; i++)
  73                 ((char *)a)[i] = ((const char *)b)[i];
  74         return a;
  75 }
  76
  77 void *memset(void *a, int sign, int count) {
  78         for (int i = 0; i < count; i++)
  79                 ((unsigned char *)a)[i] = (unsigned char)sign;
  80         return a;
  81 }
  82