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  1. #include <unistd.h>
  2. #include <string.h>
  3. #include <string>
  4.  
  5. using namespace std;
  6.  
  7. int main(int argc, char ** argv)
  8. {
  9.     (void)argc, (void)argv;
  10.  
  11.     const unsigned int bufsize = 16384;
  12.     char input_buffer[bufsize];
  13.     string output_buffer;
  14.     string what_to_append = "\t2\n";
  15.  
  16.     auto flush_output = [&](bool force) {
  17.         if (force || output_buffer.size() > bufsize)
  18.         {
  19.             write(1, output_buffer.data(), output_buffer.size());
  20.             output_buffer.resize(0);
  21.         }
  22.     };
  23.  
  24.     for (;;)
  25.     {
  26.         ssize_t bytes_read = read(0, input_buffer, sizeof(input_buffer));
  27.         if (bytes_read < 0)
  28.         {
  29.             perror("read failed");
  30.             return 1;
  31.         }
  32.         else if (bytes_read == 0)
  33.         {
  34.             break;
  35.         }
  36.  
  37.         for (char * in_ptr = input_buffer;;)
  38.         {
  39.             ssize_t remaining = input_buffer + bytes_read - in_ptr;
  40.             if (remaining <= 0) break;
  41.  
  42.             char * eol = (char*)memchr(in_ptr, '\n', remaining);
  43.             if (!eol)
  44.             {
  45.                 output_buffer.append(in_ptr, remaining);
  46.                 flush_output(false);
  47.                 break;
  48.             }
  49.             output_buffer.append(in_ptr, eol - in_ptr);
  50.             output_buffer.append(what_to_append);
  51.             flush_output(false);
  52.             in_ptr = eol + 1;
  53.         }
  54.     }
  55.     flush_output(true);
  56. }
  57.  
Success #stdin #stdout 0s 3268KB
comments (?)
stdin
copy 
abc
def
stdout
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abc	2
def	2
https://ideone.com/N5g6iS
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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