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authorEric Andersen2001-05-15 17:48:09 +0000
committerEric Andersen2001-05-15 17:48:09 +0000
commit55f9872616f0c42f3fb712cfb7f9d0bb52c8afcb (patch)
tree4dc106a5142e993d2a5e9bad32f2fcd53555047c /libbb/copyfd.c
parentc911a4389bbaa5ac85d725c8c05e452dfba8583d (diff)
downloadbusybox-55f9872616f0c42f3fb712cfb7f9d0bb52c8afcb.zip
busybox-55f9872616f0c42f3fb712cfb7f9d0bb52c8afcb.tar.gz
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.c67
1 files changed, 67 insertions, 0 deletions
diff --git a/libbb/copyfd.c b/libbb/copyfd.c
new file mode 100644
index 0000000..253a8cf
--- /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:
+*/