34 lines
760 B
C
34 lines
760 B
C
/*
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* Simple random data generator used to create reproducible test files.
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* This is inspired from POSIX.1-2001 implementation example for rand().
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* Copyright (C) 2007 by Nicolas Pitre, licensed under the GPL version 2.
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*/
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#include "test-tool.h"
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#include "git-compat-util.h"
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int cmd__genrandom(int argc, const char **argv)
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{
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unsigned long count, next = 0;
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unsigned char *c;
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if (argc < 2 || argc > 3) {
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fprintf(stderr, "usage: %s <seed_string> [<size>]\n", argv[0]);
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return 1;
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}
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c = (unsigned char *) argv[1];
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do {
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next = next * 11 + *c;
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} while (*c++);
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count = (argc == 3) ? strtoul(argv[2], NULL, 0) : -1L;
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while (count--) {
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next = next * 1103515245 + 12345;
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if (putchar((next >> 16) & 0xff) == EOF)
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return -1;
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}
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return 0;
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}
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