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Added cp(1).

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This commit is contained in:
Jonas 'Sortie' Termansen 2011-11-21 14:57:02 +01:00
parent 211af74690
commit 66f6055a13
2 changed files with 39 additions and 0 deletions
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1
utils/Makefile
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@ -6,6 +6,7 @@ INITRDDIR:=../initrd
LOCALBINARIES:=\
init \
cat \
cp \
sh \
mxsh \
clear \

38
utils/cp.cpp Normal file
View file

@ -0,0 +1,38 @@
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
bool writeall(int fd, const void* buffer, size_t len)
{
const char* buf = (const char*) buffer;
while ( len )
{
ssize_t byteswritten = write(fd, buf, len);
if ( byteswritten < 0 ) { return false; }
buf += byteswritten;
len -= byteswritten;
}
return true;
}
int main(int argc, char* argv[])
{
if ( argc != 3 ) { printf("usage: %s <from> <to>\n", argv[0]); return 0; }
int fromfd = open(argv[1], O_RDONLY);
if ( fromfd < 0 ) { printf("%s: cannot open for reading: %s\n", argv[0], argv[1]); return 1; }
int tofd = open(argv[2], O_WRONLY | O_TRUNC | O_CREAT, 0777);
if ( tofd < 0 ) { printf("%s: cannot open for writing: %s\n", argv[0], argv[2]); return 1; }
while ( true )
{
const size_t BUFFER_SIZE = 4096;
char buffer[BUFFER_SIZE];
ssize_t bytesread = read(fromfd, buffer, BUFFER_SIZE);
if ( bytesread < 0 ) { printf("%s: read failed: %s\n", argv[0], argv[1]); return 1; }
if ( bytesread == 0 ) { return 0; }
if ( !writeall(tofd, buffer, bytesread) ) { printf("%s: write failed: %s\n", argv[0], argv[2]); return 1; }
}
}