Implementation of str_replace in C

This is a very naive implementation of the PHP function str_replace in C. I wrote it in purpuse to learn C basics.

Basically, it search for the index of the searched word in the subject string.

If no index found, then it returns the subject.

Otherwize it splits the subject string into 3 parts :

• prefix : all chars before the searched word
• searched word
• suffix : all chars after the searched word and it replaces the searched word by the replace parameter.

Finally, it join prefix with replace and suffix, and returns it as string.

Basic usage

char *original_str, *replaced_str;
   
original_str = "This is a very powerful implementation of str_replace function";
replaced_str = str_replace("powerful", "naive", original_str); 
// --> RESULT : "This is a very naive implementation of str_replace function"

free(replaced_str);