#include <stdlib.h>
#include <stdio.h>
int main(int argc, char **argv) {
int TOTAL = 10;
int input[TOTAL];
int ind, value;
char buffer1[12], buffer2[12];
//init
int i;
for(i=0; i<TOTAL; i++) {
input[i] = 0;
}
//get input from user
while (1) {
read(0, buffer1, sizeof(buffer1));
ind = atoi(buffer1);
if (-1 == ind) break;
read(0, buffer2, sizeof(buffer2));
value = atoi(buffer2);
if (ind < 0) {
//get its absolute value, help prevent writing to memory locations outside the array boundary
ind = -ind;
}
input[ind % TOTAL] = value;
}
//do something interesting here with the input, like find its maximum
for(i=0; i<TOTAL; i++) {
printf("%d: %d\n", i, input[i]);
}
return 0;
}

int main(int argc, char **argv) {
if (argc != 2)
return 0;
safe_strcpy(argv[1], strlen(argv[1]));
}
void safe_strcpy(char* mybuffer, char mylen)
{
char maxlen = 63;
char buffer[64];
if(0 < mylen < maxlen)
{
strcpy(buffer, mybuffer);
}
}

#include <stdlib.h>
#include <stdio.h>
int main(int argc, char **argv) {
if (argc != 2)
return 0;
int MAXC = 100;
char *buffer;
int len = atoi(argv[1]);
if (!(buffer = (char *) malloc(MAXC)))
return -1;
if (len < 0 || len + 1 >= MAXC) {
free(buffer);
return -1;
}
if (read(0, buffer, len) <= 0) {
free(buffer);
return -1;
}
buffer[len] = '\0';
printf("you entered: %s\n", buffer);
return 0;
}

#include <stdlib.h>
#include <stdio.h>
void func(char *p) {
char buf[10+1];
memset(buf, 0, sizeof(buf));
// 10 chars only
sprintf(buf, "%10s", p);
printf("Hello, %s\n", buf);
}
int main(int argc, char **argv) {
if (argc != 2)
return 1;
func(argv[1]);
}

#include <stdlib.h>
#include <stdio.h>
int main(int argc, char **argv) {
if (argc != 2)
return 0;
safe_strcpy(argv[1], strlen(argv[1]));
}
void safe_strcpy(char* mybuffer, char mylen)
{
char maxlen = 63;
char buffer[64];
if(mylen < maxlen)
{
//it's safe now
strcpy(buffer, mybuffer);
}
}

#include <stdlib.h>
#include <stdio.h>
int main(int argc, char **argv)
{
int x, y;
if (argc != 3)
return 0;
x = atoi(argv[1]);
y = atoi(argv[2]);
return y?x/y:0;
}

int main(int argc, char **argv) {
if (argc != 3)
return 1;
unsigned short int x = strlen(argv[1]) + strlen(argv[2]);
char *buf = (char *)malloc(x);
strcpy(buf, argv[1]);
strcat(buf, argv[2]);
}

$ ./test `perl -e 'print "A" x 10'`

void weird_print(char *str)
{
char buffer[100];
int n=0;
for (n=0; n<=100;n++)
buffer[n]=str[n];
printf("%s\n", buffer);
}
int main(int argc, char *argv[])
{
if (argc>1) weird_print(argv[1]);
return 0;
}