C programming

The program needs to protect against integer overflow.

* * 1. Detect when an overflow occurred.

* 2. If an overflow occurs, discard the current string * and copy (not append) the new string to buffer.

#include

#include

#include

#include

#include

#define MAX_SIZE UCHAR_MAX

typedef unsigned char str_size_t;

str_size_t size;

char *buffer;

/*

* The purpose of this program is to allow a user to continually

* append text to a string, until CTRL-C is entered.

*

* Example Output:

*

* Hit CTRL-C to Exit.

*

* Input -> abc

* Output -> 3 {abc}

* Input -> def

* Output -> 6 {abcdef}

* Input -> ^C

* Output -> 6 {abcdef}

*

* The program needs to protect agains integer overflow.

*

* 1. Detect when an overflow occurred.

* 2. If an overflow occurs, discard the current string

* and copy (not append) the new string to buffer.

*/

void print_output()

{

printf ("Output -> %u {%s} ", size, buffer);

}

void signal_handler (int sig)

{

printf(" ");

print_output();

exit(0);

}

int main (int argc, char** argv)

{

int result;

char *tmp;

signal(SIGINT, signal_handler);

size = 0;

buffer = malloc(MAX_SIZE);

tmp = malloc(MAX_SIZE);

memset(buffer, 0, MAX_SIZE);

printf ("Hit CTRL-C to Exit. ");

while (1)

{

printf ("Input -> ");

result = scanf(" %[^ ]", tmp);

size = (size + strlen(tmp));

/* TODO - Solution */

buffer = realloc(buffer, size);

strcat(buffer, tmp);

print_output();

}

/* Any code here is unreachable. */

}