This patch from Adam Heath <doogie@debian.org>, makes print_file

(used by cat, grep, sed, etc) quite a bit faster.

Makefile

@@ -249,7 +249,7 @@ process_escape_sequence.c read_package_field.c read_text_file_to_buffer.c \
 recursive_action.c safe_read.c safe_strncpy.c seek_ared_file.c syscalls.c \
 syslog_msg_with_name.c time_string.c trim.c untar.c unzip.c vdprintf.c \
 verror_msg.c vperror_msg.c wfopen.c xfuncs.c xgetcwd.c xreadlink.c\
-xregcomp.c interface.c remove_file.c last_char_is.c
+xregcomp.c interface.c remove_file.c last_char_is.c copyfd.c
 LIBBB_OBJS=$(patsubst %.c,$(LIBBB)/%.o, $(LIBBB_CSRC))
 LIBBB_CFLAGS = -I$(LIBBB)
 ifneq ($(strip $(BB_SRC_DIR)),)

include/libbb.h

@@ -128,6 +128,7 @@ extern pid_t* find_pid_by_name( char* pidName);
 extern char *find_real_root_device_name(const char* name);
 extern char *get_line_from_file(FILE *file);
 extern void print_file(FILE *file);
+extern size_t copyfd(int fd1, int fd2);
 extern int print_file_by_name(char *filename);
 extern char process_escape_sequence(const char **ptr);
 extern char *get_last_path_component(char *path);

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:
+*/

libbb/libbb.h

@@ -128,6 +128,7 @@ extern pid_t* find_pid_by_name( char* pidName);
 extern char *find_real_root_device_name(const char* name);
 extern char *get_line_from_file(FILE *file);
 extern void print_file(FILE *file);
+extern size_t copyfd(int fd1, int fd2);
 extern int print_file_by_name(char *filename);
 extern char process_escape_sequence(const char **ptr);
 extern char *get_last_path_component(char *path);

libbb/print_file.c

@@ -26,12 +26,9 @@
 
 extern void print_file(FILE *file)
 {
-	int c;
-
-	while ((c = getc(file)) != EOF)
-		putc(c, stdout);
-	fclose(file);
 	fflush(stdout);
+	copyfd(fileno(file), fileno(stdout));
+	fclose(file);
 }
 
 extern int print_file_by_name(char *filename)