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  1. #include <stdlib.h>
  2. #include <stdio.h>
  3. #include <string.h>
  4. #include <inttypes.h>
  5. #include <errno.h>
  6.  
  7. void printLinePair(const char *line)
  8. {
  9.     size_t size = 0;
  10.     while (line[size] != ' ' && line[size] != '\0') {
  11.         size++;
  12.     }
  13.  
  14.     if (size > 0) {
  15.         fwrite(line, sizeof(char), size, stdout);
  16.     }
  17.  
  18.     printf(" : ");
  19.  
  20.     line += size;
  21.     size = 0;
  22.  
  23.     while (*line == ' ' && *line != '\0') {
  24.         line++;
  25.     }
  26.  
  27.     while (line[size] != ' ' && line[size] != '\0') {
  28.         size++;
  29.     }
  30.  
  31.     if (size > 0) {
  32.         fwrite(line, sizeof(char), size, stdout);
  33.     }
  34.  
  35.     printf("\n");
  36. }
  37.  
  38. #define BUFFER_SIZE 6
  39. int main()
  40. {
  41.     static char buffer[BUFFER_SIZE] = { 0 };
  42.     static size_t bufIdx = 0;
  43.     static size_t readBytes = 0;
  44.     int ret = EXIT_SUCCESS;
  45.     char *lineBuffer = NULL;
  46.     char *lineBufPtr = lineBuffer;
  47.     size_t lineBufferSize = 0;
  48.     size_t lineBufferCapacity = BUFFER_SIZE + 1;
  49.     size_t newLineBufferCapacity = 0;
  50.     FILE *file = stdin; // fopen("1.txt", "r");  // <========= FILE HERE
  51.  
  52.     if (!file) {
  53.         printf("Couldn't open file: %d\n", errno);
  54.         ret = EXIT_FAILURE;
  55.         goto fail_open_file;
  56.     }
  57.  
  58.     lineBuffer = malloc(lineBufferCapacity);
  59.     if (!lineBuffer) {
  60.         printf("Couldn't allocate the line buffer.");
  61.         ret = EXIT_FAILURE;
  62.         goto fail_allocate_line_buffer;
  63.     }
  64.  
  65.     while ((readBytes = fread(buffer, sizeof(char), BUFFER_SIZE, file))) {
  66.         if (lineBufferCapacity - lineBufferSize < readBytes + 1) {
  67.             newLineBufferCapacity = lineBufferCapacity * 2;
  68.             lineBufPtr = realloc(lineBuffer, newLineBufferCapacity);
  69.             if (!lineBufPtr) {
  70.                 printf("Couldn't realloc the line buffer (%zu to %zu bytes).\n",
  71.                        lineBufferCapacity, newLineBufferCapacity);
  72.                 ret = EXIT_FAILURE;
  73.                 goto fail_realloc_line_buf;
  74.             } else {
  75.                 lineBuffer = lineBufPtr;
  76.                 lineBufferCapacity = newLineBufferCapacity;
  77.             }
  78.         }
  79.  
  80.         while (bufIdx < readBytes && buffer[bufIdx] != '\0') {
  81.             while (bufIdx < readBytes && buffer[bufIdx] != '\n' && buffer[bufIdx] != '\0') {
  82.                 lineBuffer[lineBufferSize++] = buffer[bufIdx++];
  83.             }
  84.  
  85.             if (bufIdx < readBytes && buffer[bufIdx] != '\0') {
  86.                 lineBuffer[lineBufferSize++] = '\0';
  87.                 printLinePair(lineBuffer);
  88.                 lineBufferSize = 0;
  89.                 lineBuffer[0] = '\0';
  90.                 bufIdx++;
  91.             }
  92.         }
  93.  
  94.         bufIdx = 0;
  95.     }
  96.  
  97.     if (lineBufferSize > 0) {
  98.         lineBuffer[lineBufferSize++] = '\0';
  99.         printLinePair(lineBuffer);
  100.     }
  101.  
  102. fail_realloc_line_buf:
  103.     free(lineBuffer);
  104. fail_allocate_line_buffer:
  105.     fclose(file);
  106. fail_open_file:
  107.     return ret;
  108. }
  109.  
Success #stdin #stdout 0s 9424KB
comments (?)
stdin
copy 
1 2
Hello  World
Lol  Rofl
govnokod ru
stdout
copy 
1 : 2
Hello : World
Lol : Rofl
govnokod : ru
https://ideone.com/hWUwOK
language:
C99 (gcc 8.3)
created:
7 years ago
visibility:
public

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