[PATCH 1/2 (with .gitignore)] simple random data generator for tests
- From
Nicolas Pitre <nico@cam.org>
- Date
- Apr 11, 2007, 17:59 UTC
- Message-ID
- <alpine.LFD.0.98.0704111355390.28181@xanadu.home>
- In-Reply-To
- <alpine.LFD.0.98.0704111330120.28181@xanadu.home>
Reliance on /dev/urandom produces test vectors that are, well, random. This can cause problems impossible to track down when the data is different from one test invokation to another.
The goal is not to have random data to test, but rather to have a convenient way to create sets of large files with non compressible and non deltifiable data in a reproducible way.
Signed-off-by: Nicolas Pitre <nico@cam.org> ---
diff --git a/Makefile b/Makefile index a77d31d..bd0ba95 100644 --- a/Makefile +++ b/Makefile @@ -932,7 +932,7 @@ endif export NO_SVN_TESTS -test: all test-chmtime$X +test: all test-chmtime$X test-genrandom$X $(MAKE) -C t/ all test-date$X: test-date.c date.o ctype.o @@ -953,6 +953,9 @@ test-match-trees$X: test-match-trees.o $(GITLIBS) test-chmtime$X: test-chmtime.c $(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $< +test-genrandom$X: test-genrandom.c + $(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $< + check-sha1:: test-sha1$X ./test-sha1.sh @@ -1041,7 +1044,7 @@ dist-doc: clean: rm -f *.o mozilla-sha1/*.o arm/*.o ppc/*.o compat/*.o xdiff/*.o \ - test-chmtime$X $(LIB_FILE) $(XDIFF_LIB) + test-chmtime$X test-genrandom$X $(LIB_FILE) $(XDIFF_LIB) rm -f $(ALL_PROGRAMS) $(BUILT_INS) git$X rm -f *.spec *.pyc *.pyo */*.pyc */*.pyo common-cmds.h TAGS tags rm -rf autom4te.cache diff --git a/test-genrandom.c b/test-genrandom.c new file mode 100644 index 0000000..6cc4650 --- /dev/null +++ b/test-genrandom.c @@ -0,0 +1,34 @@ +/* + * Simple random data generator used to create reproducible test files. + * This is inspired from POSIX.1-2001 implementation example for rand(). + * Copyright (C) 2007 by Nicolas Pitre, licensed under the GPL version 2. + */ + +#include <stdio.h> +#include <stdlib.h> + +int main(int argc, char *argv[]) +{ + unsigned long count, next = 0; + unsigned char *c; + + if (argc < 2 || argc > 3) { + fprintf( stderr, "Usage: %s <seed_string> [<size>]", argv[0]); + return 1; + } + + c = (unsigned char *) argv[1]; + do { + next = next * 11 + *c; + } while (*c++); + + count = (argc == 3) ? strtoul(argv[2], NULL, 0) : -1L; + + while (count--) { + next = next * 1103515245 + 12345; + if (putchar((next >> 16) & 0xff) == EOF) + return -1; + } + + return 0; +} diff --git a/.gitignore b/.gitignore index 9229e91..fa7ac93 100644 --- a/.gitignore +++ b/.gitignore @@ -149,6 +149,7 @@ test-chmtime test-date test-delta test-dump-cache-tree +test-genrandom test-match-trees common-cmds.h *.tar.gz