minix/commands/i386/mtools-3.9.7/copyfile.c
2005-04-21 14:53:53 +00:00

62 lines
1.1 KiB
C
Executable file

#include "sysincludes.h"
#include "msdos.h"
#include "mtools.h"
#include "file.h"
#include "llong.h"
/*
* Copy the data from source to target
*/
int copyfile(Stream_t *Source, Stream_t *Target)
{
char buffer[8*16384];
int pos;
int ret, retw;
size_t len;
mt_size_t mt_len;
if (!Source){
fprintf(stderr,"Couldn't open source file\n");
return -1;
}
if (!Target){
fprintf(stderr,"Couldn't open target file\n");
return -1;
}
pos = 0;
GET_DATA(Source, 0, &mt_len, 0, 0);
if (mt_len & ~max_off_t_31) {
fprintf(stderr, "File too big\n");
return -1;
}
len = truncBytes32(mt_len);
while(1){
ret = READS(Source, buffer, (mt_off_t) pos, 8*16384);
if (ret < 0 ){
perror("file read");
return -1;
}
if(!ret)
break;
if(got_signal)
return -1;
if (ret == 0)
break;
if ((retw = force_write(Target, buffer, (mt_off_t) pos, ret)) != ret){
if(retw < 0 )
perror("write in copy");
else
fprintf(stderr,
"Short write %d instead of %d\n", retw,
ret);
if(errno == ENOSPC)
got_signal = 1;
return ret;
}
pos += ret;
}
return pos;
}