source: trunk/minix/commands/i386/mtools-3.9.7/file_read.c@ 15

#include "sysincludes.h"
#include "msdos.h"
#include "mtools.h"
#include "file.h"

/*
 * Read the clusters given the beginning FAT entry.  Returns 0 on success.
 */

int file_read(FILE *fp, Stream_t *Source, int textmode, int stripmode)
{
        char buffer[16384];
        int pos;
        int ret;

        if (!Source){
                fprintf(stderr,"Couldn't open source file\n");
                return -1;
        }
        
        pos = 0;
        while(1){
                ret = Source->Class->read(Source, buffer, (mt_off_t) pos, 16384);
                if (ret < 0 ){
                        perror("file read");
                        return -1;
                }
                if ( ret == 0)
                        break;
                if(!fwrite(buffer, 1, ret, fp)){
                        perror("write");
                        return -1;
                }
                pos += ret;
        }
        return 0;
}