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  1. #include <stdlib.h>
  2. #include <stdio.h>
  3. #include <string.h>
  4.  
  5. int main()
  6. {
  7.     FILE *input = stdin;
  8.     FILE *output = stdout;
  9.  
  10.     char buffer[512];
  11.     while (fgets(buffer, sizeof(buffer), input) != NULL)
  12.     {
  13.         /* The text to find */
  14.         static const char text_to_find[] = "xyz";
  15.  
  16.         /* The text to replace it with */
  17.         static const char text_to_replace[] = "abc";
  18.  
  19.         char *pos = strstr(buffer, text_to_find);
  20.         if (pos != NULL)
  21.         {
  22.             /* Allocate memory for temporary buffer */
  23.             char *temp = calloc(
  24.                 strlen(buffer) - strlen(text_to_find) + strlen(text_to_replace) + 1, 1);
  25.  
  26.             /* Copy the text before the text to replace */
  27.             memcpy(temp, buffer, pos - buffer);
  28.  
  29.             /* Copy in the replacement text */
  30.             memcpy(temp + (pos - buffer), text_to_replace, strlen(text_to_replace));
  31.  
  32.             /* Copy the remaining text from after the replace text */
  33.             memcpy(temp + (pos - buffer) + strlen(text_to_replace),
  34.                    pos + strlen(text_to_find),
  35.                    1 + strlen(buffer) - ((pos - buffer) + strlen(text_to_find)));
  36.  
  37.             fputs(temp, output);
  38.  
  39.             free(temp);
  40.         }
  41.         else
  42.             fputs(buffer, output);
  43.     }
  44.  
  45.     return 0;
  46. }
  47.  
Success #stdin #stdout 0.01s 1856KB
comments (?)
stdin
copy 
1 xyz 23
2 xyz 45
stdout
copy 
1 abc 23
2 abc 45
https://ideone.com/2kgeW
language:
C (gcc 8.3)
created:
11 years ago
visibility:
public

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