Multi tool use

is it possible to overwrite strdup from <string.h> with my own?

I need to do so because I am supposed to stub this function for unit testing.

I am using gcc version 5.4.0.

for a lot of other functions that exist in glibc like memcpy I simply wrote the implementation in my .c file and then this implementation was the one used instead of the original, but in case of strdup and some other function I get a compilation error like this one:

error: expected identifier or ‘(’ before ‘__extension__’
char* strdup (const char *__s)


I know this is because I am trying to use a function name that already exist in string.h although it works with some other functions in their as well. I wish to know if it is possible to bypass this somehow.

1 Answer
1

Looks like in your case the original strdup is a preprocessor macro, not an actual function. You can try to get rid of it:

strdup

#undef strdup
char *strdup(const char *s) {
// your code goes here
}


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