Thread: Ussing reaalloc

I need to use reaalloc to extend the memory when it goes out of bounds but I am not getting a correct output.


this is how i am trying to realloc

Code:

if(strlen(theString) - strlen(searchFor) + strlen(replace)  >= size -1)
                    {
                        size += 80;
                     //   theString = strcpy(theString,theString);
                        theString = (char*)realloc(theString,size);
                        printf("realloc worked! size should be more");
                    }

my declarations:
stringHolder = theString, searchString = searchFor, substituteString= replace.

Code:

    size = 6;
    stringHolder = (char*) calloc(size,sizeof(char));//, sizeof(char));
    searchString = (char*) calloc(10, sizeof(char));//, sizeof(char));
    substituteString = (char*) calloc(10,sizeof(char));//, sizeof(char));

how i am printing it:

Code:

    printf("\n%s", theString);
    printf("\n%d", strlen(theString));

output:

Please enter a string that is less then 80 characters:
hello
Please enter a substring to search:
e
Enter a string less then 10 characters to replace
aaa
realloc worked! size should be more
`☼j
3
Process returned 0 (0x0) execution time : 6.906 s
Press any key to continue.

output should be:
haaallo
7

Anyone advice or help?

Is the realloc in a different function from the declarations and printf?

If it is, are you returning the realloc'd pointer from the function? If you don't return it somehow (plain return or pass a pointer to a pointer) then the calling function will still have the address of the old buffer.

You should probably check that realloc actually did succeed before printing that it did

It'd be helpful if you could post your whole source file, so we could see how functions are called. I guess you call realloc before trying to expand the string?

You should post a compilable small program which demonstrates your problem. Otherwise we can't help you.

Bye, Andreas