User:Exx8/sandbox/stackoverflow
| variable name | A | B | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| value | [null string] | 1979 | ||||||||
| hex value | 00 | 00 | 00 | 00 | 00 | 00 | 00 | 00 | 07 | BB |
Now, the program attempts to store the null-terminated string "excessive" with ASCII encoding in the A buffer.
strcpy(A, "excessive");
"excessive" is 9 characters long and encodes to 10 bytes including the null terminator, but A can take only 8 bytes. By failing to check the length of the string, it also overwrites the value of B:
| variable name | A | B | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| value | 'e' | 'x' | 'c' | 'e' | 's' | 's' | 'i' | 'v' | 25856 | |
| hex | 65 | 78 | 63 | 65 | 73 | 73 | 69 | 76 | 65 | 00 |