From d6ef07406d217a728d334ae5e49c4734b4ed26f5 Mon Sep 17 00:00:00 2001
From: Matt Kraai <kraai@debian.org>
Date: Fri, 18 May 2001 14:14:55 +0000
Subject: [PATCH] Rewrote copyfd to use library functions, terminate, and copy
 correct data.

---
 include/libbb.h |  2 +-
 libbb/copyfd.c  | 40 ++++++++++++++++------------------------
 libbb/libbb.h   |  2 +-
 3 files changed, 18 insertions(+), 26 deletions(-)

diff --git a/include/libbb.h b/include/libbb.h
index 29a756b7f..4e324bf86 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -133,7 +133,7 @@ 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 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);
diff --git a/libbb/copyfd.c b/libbb/copyfd.c
index 253a8cf6e..aa938d105 100644
--- a/libbb/copyfd.c
+++ b/libbb/copyfd.c
@@ -25,36 +25,28 @@
 #include "libbb.h"
 
 
-extern size_t copyfd(int fd1, int fd2)
+extern int copyfd(int fd1, int fd2)
 {
-	char buf[32768], *writebuf;
-	int status = TRUE;
-	size_t totalread = 0, bytesread, byteswritten;
+	char buf[8192];
+	ssize_t nread, nwrote;
 
-	while(status) {
-		bytesread = read(fd1, &buf, sizeof(buf));
-		if(bytesread == -1) {
-			error_msg("read: %s", strerror(errno));
-			status = FALSE;
+	while (1) {
+		nread = safe_read(fd1, buf, sizeof(buf));
+		if (nread == 0)
 			break;
+		if (nread == -1) {
+			perror_msg("read");
+			return -1;
 		}
-		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;
+
+		nwrote = full_write(fd2, buf, nread);
+		if (nwrote == -1) {
+			perror_msg("write");
+			return -1;
 		}
 	}
-	if ( status == TRUE )
-		return totalread;
-	else
-		return -1;
+
+	return 0;
 }
 
 /* END CODE */
diff --git a/libbb/libbb.h b/libbb/libbb.h
index 29a756b7f..4e324bf86 100644
--- a/libbb/libbb.h
+++ b/libbb/libbb.h
@@ -133,7 +133,7 @@ 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 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);
-- 
2.25.1