diff options
author | Eric Andersen <andersen@codepoet.org> | 2001-05-15 21:48:09 +0400 |
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committer | Eric Andersen <andersen@codepoet.org> | 2001-05-15 21:48:09 +0400 |
commit | 55f9872616f0c42f3fb712cfb7f9d0bb52c8afcb (patch) | |
tree | 4dc106a5142e993d2a5e9bad32f2fcd53555047c /libbb/copyfd.c | |
parent | c911a4389bbaa5ac85d725c8c05e452dfba8583d (diff) |
This patch from Adam Heath <doogie@debian.org>, makes print_file
(used by cat, grep, sed, etc) quite a bit faster.
Diffstat (limited to 'libbb/copyfd.c')
-rw-r--r-- | libbb/copyfd.c | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/libbb/copyfd.c b/libbb/copyfd.c new file mode 100644 index 000000000..253a8cf6e --- /dev/null +++ b/libbb/copyfd.c @@ -0,0 +1,67 @@ +/* vi: set sw=4 ts=4: */ +/* + * Utility routines. + * + * Copyright (C) 1999-2001 Erik Andersen <andersee@debian.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <unistd.h> +#include <string.h> +#include <errno.h> +#include "libbb.h" + + +extern size_t copyfd(int fd1, int fd2) +{ + char buf[32768], *writebuf; + int status = TRUE; + size_t totalread = 0, bytesread, byteswritten; + + while(status) { + bytesread = read(fd1, &buf, sizeof(buf)); + if(bytesread == -1) { + error_msg("read: %s", strerror(errno)); + status = FALSE; + break; + } + byteswritten = 0; + writebuf = buf; + while(bytesread) { + byteswritten = write( fd2, &writebuf, bytesread ); + if(byteswritten == -1) { + error_msg("write: %s", strerror(errno)); + status = FALSE; + break; + } + bytesread -= byteswritten; + writebuf += byteswritten; + } + } + if ( status == TRUE ) + return totalread; + else + return -1; +} + +/* END CODE */ +/* +Local Variables: +c-file-style: "linux" +c-basic-offset: 4 +tab-width: 4 +End: +*/ |