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Commit | Line | Data |
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2dca1af4 NP |
1 | /* |
2 | * Simple random data generator used to create reproducible test files. | |
3 | * This is inspired from POSIX.1-2001 implementation example for rand(). | |
4 | * Copyright (C) 2007 by Nicolas Pitre, licensed under the GPL version 2. | |
5 | */ | |
6 | ||
7 | #include <stdio.h> | |
8 | #include <stdlib.h> | |
9 | ||
10 | int main(int argc, char *argv[]) | |
11 | { | |
12 | unsigned long count, next = 0; | |
13 | unsigned char *c; | |
14 | ||
15 | if (argc < 2 || argc > 3) { | |
16 | fprintf( stderr, "Usage: %s <seed_string> [<size>]", argv[0]); | |
17 | return 1; | |
18 | } | |
19 | ||
20 | c = (unsigned char *) argv[1]; | |
21 | do { | |
22 | next = next * 11 + *c; | |
23 | } while (*c++); | |
24 | ||
25 | count = (argc == 3) ? strtoul(argv[2], NULL, 0) : -1L; | |
26 | ||
27 | while (count--) { | |
28 | next = next * 1103515245 + 12345; | |
29 | if (putchar((next >> 16) & 0xff) == EOF) | |
30 | return -1; | |
31 | } | |
32 | ||
33 | return 0; | |
34 | } |