kolibrios/programs/develop/ktcc/trunk/libc/stdio/fread.c

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#include <stdio.h>
#include <kolibrisys.h>
int fread(void *buffer,int size,int count,FILE* file)
{
dword res;
dword fullsize;
if(!file || !buffer)
{
errno = E_INVALIDPTR;
return 0;
}
if ((file->mode &3)!=FILE_OPEN_READ && (file->mode & FILE_OPEN_PLUS==0))
{
errno = E_ACCESS;
return 0;
}
fullsize=count*size;
if ((fullsize+file->filepos)>=(file->filesize))
{
fullsize=file->filesize-file->filepos;
if (fullsize<=0) return(0);
}
res=_ksys_readfile(file->filename,file->filepos,fullsize,buffer);
if (res==0)
{
file->filepos=file->filepos+fullsize;
fullsize=fullsize/size;
return(fullsize);
}
else
{
errno = -res;
return 0;
}
}