replace a substring from a string - C

[mikewagan]

Hello guys, need help here on C! I need a function to replace a substring inside a string with another new string. Example, we have "you are famous than me", we need to replace "famous" with "more famous", so to get the output "you are more famous than me". How do we do that?

Thanks for your help guys!

[Ganon11]

So you have a string "[some text...][TEXT TO BE REPLACED][more text...]" and you want to replace "TEXT TO BE REPLACED" with "TEXT TO REPLACE WITH". You can do this using the string::substr method and the string::find method. Look at these methods and try to figure out how you can use them.

EDIT: You could do this if it were C++, but this is C. Whoops.

I'm not sure if there's a find function for CStrings, but you will do essentially the same thing - find the text to be replaced (probably manually), write the text before this to a new buffer, write the new text, and write the remaining text to the new buffer.

[weaknessforcats]

And be sure while you are doing this to not return a heap string that must be deleted nor overrun the stack buffer containing the original string.

[mikelwagan]

Hello guys, need help here on C! I need a function to replace a substring inside a string with another new string. Example, we have "you are famous than me", we need to replace "famous" with "more famous", so to get the output "you are more famous than me". How do we do that?

Thanks for your help guys!

tokayo... hehehe


void replaceStr(char *orig,
char *keyword,
char *repword,
char *out)
{
char *tmpStr = strstr(orig, keyword);

if (tmpStr == NULL)
{
/* wala */

}
else
{
/* use strncpy and strcat. as simple as that */

}

}

[mikelwagan]

implement string functions if your prof doesn't want you to use them. you sure know their functions, right? :D