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#include "stdio_impl.h"
static int overflow(FILE *f, int c)
{
/* Initialize if we're not already writing */
if (!f->wend) {
/* Fail if we're in error state or unwritable. */
if (f->flags & (F_ERR|F_NOWR)) return EOF;
/* Set byte orientation -1,0=>-1; 1=>1 */
f->mode |= f->mode-1;
/* Clear read buffer (easier than summoning nasal demons) */
f->rpos = f->rend = f->rstop = 0;
/* Activate write through the buffer */
f->wpos = f->wbase = f->buf;
f->wend = f->buf + f->buf_size;
f->wstop = (f->lbf < 0) ? f->wend - 1 : 0;
}
/* Buffer can always hold at least 1 byte... */
if (c != EOF) {
*f->wpos++ = c;
if (f->wpos <= f->wstop && c != f->lbf) return c;
}
/* ...since if the next call fails, buffer is empty. */
if (f->write(f, f->wbase, f->wpos - f->wbase) < 0) {
f->flags |= F_ERR;
f->wpos = f->wbase = f->wend = f->wstop = 0;
return EOF;
}
/* Buffer is empty so reset position to beginning */
f->wpos = f->wbase;
return c;
}
int __overflow(FILE *f, int c)
{
return overflow(f, c & 0xff);
}
int __oflow(FILE *f)
{
overflow(f, EOF);
return (f->flags & F_ERR) ? EOF : 0;
}
/* Link flush-on-exit code iff any stdio write functions are linked. */
int (*const __fflush_on_exit)(FILE *) = fflush;
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