kolibrios/programs/develop/ktcc/trunk/libc/stdio/fwrite.c
siemargl 524cab3cd8 added read buffering, ungetc
git-svn-id: svn://kolibrios.org@7184 a494cfbc-eb01-0410-851d-a64ba20cac60
2018-03-12 20:41:06 +00:00

84 lines
1.7 KiB
C

#include <stdio.h>
#include <kolibrisys.h>
int fwrite(void *buffer,int size,int count,FILE* file)
{
dword res;
dword fullsize;
if(!file || !buffer)
{
errno = E_INVALIDPTR;
return EOF;
}
if ((file->mode & 3)==FILE_OPEN_READ)
{
errno = E_ACCESS;
return 0;
}
if ((file->mode &3)==FILE_OPEN_APPEND)
file->filepos=file->filesize;
fullsize=count*size;
if ((file->filesize)<(file->filepos+fullsize)) file->filesize=file->filepos+fullsize;
/*
if (file->mode==FILE_OPEN_APPEND)
{
file->filepos==file->filesize;
res=_ksys_appendtofile(file->filename,file->filepos,fullsize,buffer);
if (res==0)
{
file->filepos+=fullsize;
fullsize=fullsize/size;
return(fullsize);
}
else return(0);
}
*/
file->ungetc_buf = EOF;
if (file->filepos >= file->buffer_start && file->filepos < file->buffer_end) // drop buffer, if change his data
{
file->buffer_start = -1;
file->buffer_end = -1;
}
if ((file->mode &3)==FILE_OPEN_WRITE || (file->mode&3)==FILE_OPEN_APPEND) // always true, as read checked previous
{
if (file->filepos==0)
{ //file mot created yet
res=_ksys_rewritefile(file->filename,fullsize,buffer);
if (res==0)
{
file->filepos+=fullsize;
fullsize=fullsize/count;
return(fullsize);
} else
{
errno = -res;
return(0);
}
}
else
{
res=_ksys_appendtofile(file->filename,file->filepos,fullsize,buffer);
if (res==0)
{
file->filepos+=fullsize;
fullsize=fullsize/count;
return(fullsize);
} else
{
errno = -res;
return(0);
}
}
}
else return(0);
}