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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 09:25:10 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 09:25:10 +0000 |
commit | 5dced3d1b3deca80e01415a2e35dc7972dcbfae7 (patch) | |
tree | 6a403684e0978f0287d7f0ec0e5aab1fd31a59e1 /contrib/make-sparse.c | |
parent | Initial commit. (diff) | |
download | e2fsprogs-5dced3d1b3deca80e01415a2e35dc7972dcbfae7.tar.xz e2fsprogs-5dced3d1b3deca80e01415a2e35dc7972dcbfae7.zip |
Adding upstream version 1.47.0.upstream/1.47.0
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | contrib/make-sparse.c | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/contrib/make-sparse.c b/contrib/make-sparse.c new file mode 100644 index 0000000..98b86b0 --- /dev/null +++ b/contrib/make-sparse.c @@ -0,0 +1,91 @@ +/* + * make-sparse.c --- make a sparse file from stdin + * + * Copyright 2004 by Theodore Ts'o. + * + * %Begin-Header% + * This file may be redistributed under the terms of the GNU Public + * License. + * %End-Header% + */ + +#ifndef _LARGEFILE_SOURCE +#define _LARGEFILE_SOURCE +#endif +#ifndef _LARGEFILE64_SOURCE +#define _LARGEFILE64_SOURCE +#endif + +#include <stdio.h> +#include <unistd.h> +#include <stdlib.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <errno.h> + +int full_read(int fd, char *buf, size_t count) +{ + int got, total = 0; + int pass = 0; + + while (count > 0) { + got = read(fd, buf, count); + if (got == -1) { + if ((errno == EINTR) || (errno == EAGAIN)) + continue; + return total ? total : -1; + } + if (got == 0) { + if (pass++ >= 3) + return total; + continue; + } + pass = 0; + buf += got; + total += got; + count -= got; + } + return total; +} + +int main(int argc, char **argv) +{ + int fd, got, i; + int zflag = 0; + char buf[1024]; + + if (argc != 2) { + fprintf(stderr, "Usage: make-sparse out-file\n"); + exit(1); + } + fd = open(argv[1], O_WRONLY|O_CREAT|O_TRUNC|O_LARGEFILE, 0777); + if (fd < 0) { + perror(argv[1]); + exit(1); + } + while (1) { + got = full_read(0, buf, sizeof(buf)); + if (got == 0) + break; + if (got == sizeof(buf)) { + for (i=0; i < sizeof(buf); i++) + if (buf[i]) + break; + if (i == sizeof(buf)) { + lseek(fd, sizeof(buf), SEEK_CUR); + zflag = 1; + continue; + } + } + zflag = 0; + write(fd, buf, got); + } + if (zflag) { + lseek(fd, -1, SEEK_CUR); + buf[0] = 0; + write(fd, buf, 1); + } + return 0; +} + |