--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/genericopenlibs/cstdlib/LSTDIO/FVWRITE.C Tue Feb 02 02:01:42 2010 +0200
@@ -0,0 +1,199 @@
+/* FVWRITE.C
+ *
+ * Portions Copyright (c) 1990-2004 Nokia Corporation and/or its subsidiary(-ies).
+ * All rights reserved.
+ */
+
+/* No user fns here. Pesch 15apr92. */
+
+/*
+ * Copyright (c) 1990 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by the University of California, Berkeley. The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#include <stdio_r.h>
+#include <string.h>
+#include "LOCAL.H"
+#include "FVWRITE.H"
+
+#define MIN(a, b) ((a) < (b) ? (a) : (b))
+#define COPY(n) (void) memmove((void *) fp->_p, (void *) p, (size_t) (n))
+
+#define GETIOV(extra_work) \
+ while (len == 0) \
+ { \
+ extra_work; \
+ p = (const char*)iov->iov_base; \
+ len = iov->iov_len; \
+ iov++; \
+ }
+
+/*
+ * 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 (register FILE *fp,register struct __suio *uio)
+{
+ register size_t len;
+ register const char *p;
+ register struct __siov *iov;
+ register int w, s;
+ char *nl;
+ int nlknown, nldist = -1;
+
+ if ((len = uio->uio_resid) == 0)
+ return 0;
+
+ /* make sure we can write */
+ if (cantwrite (fp))
+ return EOF;
+
+ iov = uio->uio_iov;
+ len = 0;
+ 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 (;);
+ w = fp->_w;
+ if (fp->_flags & __SSTR)
+ {
+ if ((int)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 && (int)len > w)
+ {
+ /* fill and flush */
+ COPY (w);
+ /* fp->_w -= w; *//* unneeded */
+ fp->_p += w;
+ if (fflush (fp))
+ goto err;
+ }
+ else if ((int)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;
+ do
+ {
+ GETIOV (nlknown = 0);
+ if (!nlknown)
+ {
+ nl = (char *)memchr ((void *) p, '\n', len);
+ nldist = nl ? nl + 1 - p : len + 1;
+ nlknown = 1;
+ }
+ s = MIN ((int)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 (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 (fflush (fp))
+ goto err;
+ nlknown = 0;
+ }
+ p += w;
+ len -= w;
+ }
+ while ((uio->uio_resid -= w) != 0);
+ }
+ return 0;
+
+err:
+ fp->_flags |= __SERR;
+ return EOF;
+}