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  1. #include <vector>
  2. #include <string>
  3. #include <cstring>
  4. #include <iostream>
  5.  
  6. #define MAX_A 40
  7. #define MAX_B 3
  8. #define MAX_C 40
  9. #define MAX_D 4
  10.  
  11. struct Foo {
  12.     char a[ MAX_A ];
  13.     char b[ MAX_B ];
  14.     char c[ MAX_C ];
  15.     char d[ MAX_D ];
  16. };
  17.  
  18. template <std::ptrdiff_t N>
  19. const char* extractToken(const char* inIt, char (&buf)[N])
  20. {
  21.     if (!inIt || !*inIt)
  22.         return NULL;
  23.  
  24.     const char* end = strchr(inIt, '@');
  25.     if (end)
  26.     {
  27.         strncpy(buf, inIt, std::min(N, end-inIt));
  28.         return end + 1;
  29.     }
  30.     strncpy(buf, inIt, N);
  31.     return NULL;
  32. }
  33.  
  34. template <std::ptrdiff_t N>
  35. std::string display(const char (&buf)[N])
  36. {
  37.     std::string result;
  38.     for(size_t i=0; i<N && buf[i]; ++i)
  39.        result += buf[i];
  40.     return result; 
  41. }
  42.  
  43. int main(int argc, const char *argv[])
  44. {
  45.     std::string input = "abcd@efgh@ijkl@mnop";
  46.  
  47.     Foo foo = { 0 };
  48.  
  49.     const char* cursor = input.c_str();
  50.     cursor = extractToken(cursor, foo.a);
  51.     cursor = extractToken(cursor, foo.b);
  52.     cursor = extractToken(cursor, foo.c);
  53.     cursor = extractToken(cursor, foo.d);
  54.  
  55.     std::cout << "foo.a: '" << display(foo.a) << "'\n";
  56.     std::cout << "foo.b: '" << display(foo.b) << "'\n";
  57.     std::cout << "foo.c: '" << display(foo.c) << "'\n";
  58.     std::cout << "foo.d: '" << display(foo.d) << "'\n";
  59. }
  60.  
Success #stdin #stdout 0.01s 2860KB
comments (?)
stdin
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Standard input is empty
stdout
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foo.a: 'abcd'
foo.b: 'efg'
foo.c: 'ijkl'
foo.d: 'mnop'
https://ideone.com/KdAhO
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
secret

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