Pointer Data Getting Cut Off

Quote:

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Originally Posted by matsp

Nope, str(r)chr() returns NULL if the searched for item is not found.

However, as Elysia says, you can not modify what a pointer points to, unless you pass a pointer to pointer. [Or you could return a pointer].

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Mats

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Oh, ok, thanks for clarifying. I didn't know that.

Quote:

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Originally Posted by carrotcake1029

The only problem I am having now is that when no extension is found, I want to return a null pointer, but for some stupid reason I am not seeing, I don't know how to make it a null pointer can anyone help me out. The line I am trying to set it to null is highlighted in red.

Code:

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#include <stdio.h>
#include <string.h>
#include <stdlib.h>

void getext(const char *path, char *ext);

int main (void)
{
        char *path = "foo/bar.baz/blah";
        char *ext = malloc(FILENAME_MAX * sizeof(char));
       
    getext(path, ext);
    if (ext == NULL)
            printf("No extension found\n");
    else
            printf("Extension: %s\n", ext);

    return 0;
}

void getext(const char *path, char *ext)
{
        char *pch;
       
        pch = strrchr(path, '/');
        if (pch != NULL)
                pch = strrchr(pch, '.');
        else
                pch = strrchr(path, '.');

        if (pch == NULL)
                *ext = NULL;
        else
                memcpy(ext, pch + 1, strlen(pch));
}

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What I meant was the highlighted branch is not executed as he probably expects.

Yes, that is likely too.
It is important to remember that the else of an if will be executed if the condition is false.

Yeah I was just pointing out this but i agree with your point.