Thread: strtok difficulties

I have a character array that will have a prefix and then a filename that will be between two square brackets. Something like this;

get[filename]

I need to isolate the characters between the brackets. Here is my attempt:

Code:

char* get_filename(char selection[]) {
    
    char* ptr;
    char* rv;
    char* temp;
    
    ptr = strtok(selection, "[");
    ptr = strtok(NULL, "[");
    strncpy(temp, ptr, sizeof(ptr));
    ptr = strtok(temp, "]");
    
    strncpy(rv, ptr, sizeof(ptr));
    strcat(rv, "\0");
    fprintf(stdout, "%s\n", rv);
    return rv;
}

But of course, this isn't working. Can somebody please help me figure out what I am doing wrong? Thanks!

Thanks!

Have you read how the function works? strtok

Code:

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

char* get_filename(char selection[])
{
    char* ptr;

    /*
        g-e-t-[-f-i-l-e-n-a-m-e-.-x-x-x-]-\0
    */


    ptr = strtok(selection, "[]");
    /*
        g-e-t-\0-f-i-l-e-n-a-m-e-.-x-x-x-]-\0
        ^     ^
        ptr   null character
    */


    ptr = strtok(NULL,"[]");
    /*
        g-e-t-\0-f-i-l-e-n-a-m-e-.-x-x-x-\0-\0
                 ^                       ^
                 ptr                     null char
    */


    return ptr;
}

int main(void)
{
    char testString[] = "get[filename.xxx]";
    char *fname = NULL;

    fname = get_filename(testString);

    printf("%s\n",fname);

    return 0;
}