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Always produce the same random data.

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This commit is contained in:
Brian Wellington 2000-08-09 00:30:57 +00:00
parent babeb4b142
commit ac0e6a081f
1 changed files with 14 additions and 34 deletions
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48
bin/tests/genrandom.c
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@ -15,7 +15,7 @@
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: genrandom.c,v 1.2 2000/08/09 00:21:26 bwelling Exp $ */
/* $Id: genrandom.c,v 1.3 2000/08/09 00:30:57 bwelling Exp $ */
#include <stdio.h>
#include <stdlib.h>
@ -26,7 +26,7 @@ main(int argc, char **argv) {
unsigned int bytes;
unsigned int k;
char *endp;
FILE *urandom, *fp;
FILE *fp;
if (argc != 3) {
printf("usage: genrandom k file\n");
@ -45,42 +45,22 @@ main(int argc, char **argv) {
exit(1);
}
urandom = fopen("/dev/urandom", "r");
if (urandom != NULL) {
unsigned char data[1024];
while (bytes > 0) {
size_t n, toread;
toread = sizeof(data);
if (toread > bytes)
toread = bytes;
n = fread(data, 1, toread, urandom);
if (n <= 0) {
printf("error reading /dev/urandom\n");
exit(1);
}
if (fwrite(data, 1, n, fp) != n) {
printf("error writing to file\n");
exit(1);
}
bytes -= n;
srand(0x12345678);
while (bytes > 0) {
unsigned short int x = htons(rand() & 0xFFFF);
unsigned char c = x & 0xFF;
if (fwrite(&c, 1, 1, fp) != 1) {
printf("error writing to file\n");
exit(1);
}
fclose(urandom);
} else {
unsigned int seed = (unsigned int) time(NULL);
srand(seed);
while (bytes > 0) {
int x = rand();
if (fwrite(&x, 1, sizeof(int), fp) != sizeof(int)) {
printf("error writing to file\n");
exit(1);
}
bytes -= sizeof(int);
c = x >> 8;
if (fwrite(&c, 1, 1, fp) != 1) {
printf("error writing to file\n");
exit(1);
}
bytes -= 2;
}
fclose(fp);
exit(0);
}