+++ /dev/null
-/* $OpenBSD: fvwrite.c,v 1.16 2009/10/22 01:23:16 guenther Exp $ */
-/*
- * SPDX-License-Identifier: BSD-3-Clause
- *
- * Copyright (C) 1990, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Chris Torek.
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <errno.h>
-#include "local.h"
-#include "fvwrite.h"
-#include "various.h"
-
-/*
- * 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(LTTNG_UST_LFILE *fp, struct __lttng_ust_suio *uio)
-{
- size_t len;
- char *p;
- struct __lttng_ust_siov *iov;
- int w, s;
- char *nl;
- int nlknown, nldist;
-
- if ((len = uio->uio_resid) == 0)
- return (0);
- /* make sure we can write */
- if (cantwrite(fp)) {
- errno = EBADF;
- return (EOF);
- }
-
-#define MIN(a, b) ((a) < (b) ? (a) : (b))
-#define COPY(n) (void)memcpy((void *)fp->_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->_flags & __SNBF) {
- /*
- * Unbuffered: write up to BUFSIZ bytes at a time.
- */
- do {
- GETIOV(;);
- w = (*fp->_write)(fp->_cookie, p, MIN(len, BUFSIZ));
- if (w <= 0)
- goto err;
- p += w;
- len -= w;
- } while ((uio->uio_resid -= w) != 0);
- } else if ((fp->_flags & __SLBF) == 0) {
- /*
- * Fully buffered: fill partially full buffer, if any,
- * and then flush. If there is no partial buffer, write
- * one _bf._size byte chunk directly (without copying).
- *
- * String output is a special case: write as many bytes
- * as fit, but pretend we wrote everything. This makes
- * snprintf() return the number of bytes needed, rather
- * than the number used, and avoids its write function
- * (so that the write function can be invalid).
- */
- do {
- GETIOV(;);
- if ((fp->_flags & (__SALC | __SSTR)) ==
- (__SALC | __SSTR) && fp->_w < len) {
- size_t blen = fp->_p - fp->_bf._base;
- unsigned char *_base;
- int _size;
-
- /* Allocate space exponentially. */
- _size = fp->_bf._size;
- do {
- _size = (_size << 1) + 1;
- } while (_size < blen + len);
- _base = realloc(fp->_bf._base, _size + 1);
- if (_base == NULL)
- goto err;
- fp->_w += _size - fp->_bf._size;
- fp->_bf._base = _base;
- fp->_bf._size = _size;
- fp->_p = _base + blen;
- }
- w = fp->_w;
- if (fp->_flags & __SSTR) {
- if (len < w)
- w = len;
- COPY(w); /* copy MIN(fp->_w,len), */
- fp->_w -= w;
- fp->_p += w;
- w = len; /* but pretend copied all */
- } else if (fp->_p > fp->_bf._base && len > w) {
- /* fill and flush */
- COPY(w);
- /* fp->_w -= w; */ /* unneeded */
- fp->_p += w;
- if (ust_safe_fflush(fp))
- goto err;
- } else if (len >= (w = fp->_bf._size)) {
- /* write directly */
- w = (*fp->_write)(fp->_cookie, p, w);
- if (w <= 0)
- goto err;
- } else {
- /* fill and done */
- w = len;
- COPY(w);
- fp->_w -= w;
- fp->_p += w;
- }
- p += w;
- len -= w;
- } while ((uio->uio_resid -= w) != 0);
- } else {
- /*
- * Line buffered: like fully buffered, but we
- * must check for newlines. Compute the distance
- * to the first newline (including the newline),
- * or `infinity' if there is none, then pretend
- * that the amount to write is MIN(len,nldist).
- */
- nlknown = 0;
- nldist = 0; /* XXX just to keep gcc happy */
- do {
- GETIOV(nlknown = 0);
- if (!nlknown) {
- nl = memchr((void *)p, '\n', len);
- nldist = nl ? nl + 1 - p : len + 1;
- nlknown = 1;
- }
- s = MIN(len, nldist);
- w = fp->_w + fp->_bf._size;
- if (fp->_p > fp->_bf._base && s > w) {
- COPY(w);
- /* fp->_w -= w; */
- fp->_p += w;
- if (ust_safe_fflush(fp))
- goto err;
- } else if (s >= (w = fp->_bf._size)) {
- w = (*fp->_write)(fp->_cookie, p, w);
- if (w <= 0)
- goto err;
- } else {
- w = s;
- COPY(w);
- fp->_w -= w;
- fp->_p += w;
- }
- if ((nldist -= w) == 0) {
- /* copied the newline: flush and forget */
- if (ust_safe_fflush(fp))
- goto err;
- nlknown = 0;
- }
- p += w;
- len -= w;
- } while ((uio->uio_resid -= w) != 0);
- }
- return (0);
-
-err:
- fp->_flags |= __SERR;
- return (EOF);
-}
projects / lttng-ust.git / blobdiff