Standard function to replace character or substring in a char array? [duplicate]

Question

I need a function from the standard library that replaces all occurrences of a character in a string by another character.

I also need a function from the standard library that replaces all occurrences of a substring in a string by another string.

Are there any such functions in the standard library?

Answer 1

There is no direct function to do that. You have to write something like this, using strchr:

char* replace_char(char* str, char find, char replace){
    char *current_pos = strchr(str,find);
    while (current_pos) {
        *current_pos = replace;
        current_pos = strchr(current_pos,find);
    }
    return str;
}

For whole strings, I refer to this answered question