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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. char* slice( const char* str, size_t length,
  5.     const size_t offset = 0,
  6.     const size_t copy = 1, const size_t skip = 0,
  7.     size_t remainder = 1 )
  8. {
  9.     if( length <= offset ) return NULL;
  10.     length -= offset;
  11.  
  12.     remainder               = remainder > 0; 
  13.     const   size_t  pair    = copy + skip;
  14.     const   size_t  pairs   = length / pair * pair;
  15.     remainder               = length % pair * remainder;
  16.  
  17.     char*           src     = (char*)str + offset;
  18.     char*           new_str = (char*)malloc( pairs + remainder );
  19.     const   char*   end     = src + pairs;
  20.     char*           dst     = new_str;
  21.  
  22.     while( src < end )
  23.     {
  24.         for( size_t i = 0; i < copy; ++i )
  25.             dst[i] = src[i];
  26.         src += pair;
  27.         dst += copy;
  28.     }
  29.  
  30.     for( size_t i = 0; i < remainder; ++i )
  31.         dst[i] = src[i];
  32.     dst[remainder] = 0;
  33.  
  34.     return new_str; 
  35. }
  36.  
  37. int main()
  38. {
  39.     puts( slice( "01234567", 8, 0, 1, 1 ) );
  40.     puts( slice( "%01234567", 9, 1, 1, 1 ) );
  41.     puts( slice( "%01%23%45%67", 12, 1, 2, 1 ) );
  42.     puts( slice( "%01%23%45%6789", 14, 1, 2, 1 ) );
  43.     puts( slice( "%01%23%45%6789", 14, 1, 2, 1, false ) );
  44. 	return 0;
  45. }
Success #stdin #stdout 0s 3412KB
comments (?)
stdin 
Standard input is empty
stdout 
0246
0246
01234567
012345679
01234567
https://ideone.com/ArhgnP
slicing
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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