int
__sflush(FILE *fp)
{
unsigned char *p;
int n, t;
t = fp->pub._flags;
if ((t & __SWR) == 0)
return (0);
if ((p = fp->_bf._base) == NULL)
return (0);
n = fp->pub._p - p; /* write this much */
/*
* Set these immediately to avoid problems with longjmp and to allow
* exchange buffering (via setvbuf) in user write function.
*/
fp->pub._p = p;
fp->pub._w = t & (__SLBF|__SNBF) ? 0 : fp->_bf._size;
for (; n > 0; n -= t, p += t) {
t = _swrite(fp, (char *)p, n);
if (t <= 0) {
fp->pub._flags |= __SERR;
return (EOF);
}
}
return (0);
}
/*
* Write some memory regions. Return zero on success, EOF on error.
*
* This routine is large and unsightly, but most of the ugliness due
* to the three different kinds of output buffering is handled here.
*/
int
__sfvwrite(FILE *fp, struct __suio *uio)
{
size_t len;
char *p;
struct __siov *iov;
int w, s;
char *nl;
int nlknown, nldist;
if ((len = uio->uio_resid) == 0)
return (0);
/* make sure we can write */
if (prepwrite(fp) != 0)
return (EOF);
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#define COPY(n) memcpy((void *)fp->pub._p, (void *)p, (size_t)(n))
iov = uio->uio_iov;
p = iov->iov_base;
len = iov->iov_len;
iov++;
#define GETIOV(extra_work) \
while (len == 0) { \
extra_work; \
p = iov->iov_base; \
len = iov->iov_len; \
iov++; \
}
if (fp->pub._flags & __SNBF) {
/*
* Unbuffered: write up to BUFSIZ bytes at a time.
*/
do {
GETIOV(;);
w = _swrite(fp, p, MIN(len, BUFSIZ));
if (w <= 0)
goto err;
p += w;
len -= w;
} while ((uio->uio_resid -= w) != 0);
} else if ((fp->pub._flags & __SLBF) == 0) {