Example code to popular a char pointer in a function through a function argument pointer. This example is for anyone who has beat their against the wall. This example is used as a mock up for how one may try pull a buffer from a microcontroller that is built for a UART interrupt.

stringFunctionSet.c

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

void copy_string(char *target, char *source)
{
        while(*source)
        {
                *target = *source;
                source++; target++;
        }
        *target = '\0';
}

void implant(char *stuff)
{
        char loader[] = "Hello";
        copy_string(stuff, (char*)loader);
}



int main(void)
{
        char *toload = malloc(20);

        implant(toload);

        printf("%s\n",toload);
        
        free(toload);
        
        implant(toload);        
 
        printf("%s\n",toload); 

        return 0;
}