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  1. #include <string.h>
  2. #include <stdio.h>
  3.  
  4. void replace(const char* str, char* result, const char* sep,
  5.              const char* replace_what, const char* replace_with)
  6. {
  7.     result[0] = '\0';
  8.     while(*str != '\0') {
  9.         size_t len = strspn(str, sep);
  10.         strncat(result, str, len);
  11.         str += len;
  12.  
  13.         len = strcspn(str, sep);
  14.         if(strncmp(str, replace_what, len) == 0)
  15.             strcat(result, replace_with);
  16.         else
  17.             strncat(result, str, len);
  18.         str += len;
  19.     }
  20. }
  21.  
  22. int main()
  23. {
  24.     char origin[] = "a1aaa1a";
  25.     char result[100];
  26.     char replace_what[] = "a";
  27.     char replace_with[] = "b";
  28.     char tok[] = "123";
  29.     replace(origin, result, tok, replace_what, replace_with);
  30.     printf("%s", result);
  31.     return 0;
  32. }
Success #stdin #stdout 0s 2052KB
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stdin
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Standard input is empty
stdout
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b1aaa1b
https://ideone.com/KCzXLv
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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