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| #include <stdlib.h> | |
| #include <stdio.h> | |
| #if defined(WIN32) || defined(_WIN32) || defined(__WIN32) && !defined(__CYGWIN__) | |
| #include <fcntl.h> | |
| #define PIPE(X) _pipe(X, 2, O_RAW) | |
| #else | |
| #include <unistd.h> | |
| #define PIPE(X) pipe(X) | |
| #endif | |
| int p(void *ptr) { | |
| int fd[2]; | |
| if (ptr == NULL) return 0; | |
| if (PIPE(fd)) return 0; | |
| if (write(fd[1], ptr, 1) == -1) return 0; | |
| return 1; | |
| } | |
| #define free(ptr) {ptr = 0; free(ptr);} | |
| int main() { | |
| //uninitialized ptr returns 0 | |
| char *c; | |
| printf("%i\n", p(c)); | |
| //NULL ptr returns 0 | |
| c = 0; | |
| printf("%i\n", p(c)); | |
| //invalid ptr returns 0 | |
| c = (char*)0x234890a; | |
| printf("%i\n", p(c)); | |
| //freed ptr returns 0 | |
| free(c); | |
| printf("%i\n", p(c)); | |
| //allocated ptr returns 1 | |
| c = malloc(10); | |
| printf("%i\n", p(c)); | |
| //valid ptr returns 1 | |
| char f = 'F'; | |
| c = &f; | |
| printf("%i\n", p(c)); | |
| } |
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