From 3273cb68f82adb0347e3ad1810fc891ad3dbe217 Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Sun, 8 Jan 2017 05:16:25 +0100 Subject: Add vu-repeat MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- src/vu-repeat.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+) create mode 100644 src/vu-repeat.c (limited to 'src/vu-repeat.c') diff --git a/src/vu-repeat.c b/src/vu-repeat.c new file mode 100644 index 0000000..69ac8ce --- /dev/null +++ b/src/vu-repeat.c @@ -0,0 +1,59 @@ +/* See LICENSE file for copyright and license details. */ +#include "arg.h" +#include "util.h" + +#include +#include +#include + +static void +usage(void) +{ + eprintf("usage: %s count file\n", argv0); +} + +int +main(int argc, char *argv[]) +{ + struct stat st; + size_t count, ptr, n, ptw; + int fd; + ssize_t r; + char buf[BUFSIZ]; + + ARGBEGIN { + default: + usage(); + } ARGEND; + + if (argc != 2) + usage(); + + if (tozu(argv[0], 0, SIZE_MAX, &count)) + eprintf("the count must be an integer in [0, %zu]\n", SIZE_MAX); + + fd = open(argv[1], O_RDONLY); + if (fd < 0) + eprintf("open %s:", argv[1]); + + while (count--) { + posix_fadvise(fd, 0, 0, POSIX_FADV_SEQUENTIAL); + for (ptr = 0;;) { + r = pread(fd, buf, sizeof(buf), ptr); + if (r < 0) + eprintf("pread %s:", argv[1]); + else if (r == 0) + break; + ptr += n = (size_t)r; + for (ptw = 0; ptw < n;) { + r = write(STDOUT_FILENO, buf + ptw, n - ptw); + if (r < 0) + eprintf("write :"); + ptw += (size_t)r; + } + } + } + + close(fd); + return 0; +} -- cgit v1.2.3-70-g09d2