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62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
/* An interface to write() that writes all it is asked to write.
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Copyright (C) 1993, 1994, 1997, 1998, 1999, 2000, 2001, 2002 Free Software
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Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#if HAVE_CONFIG_H
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# include <config.h>
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#endif
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/* Specification. */
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#include "full-write.h"
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#include <errno.h>
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#ifndef errno
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extern int errno;
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#endif
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#include "safe-write.h"
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/* Write COUNT bytes at BUF to descriptor FD, retrying if interrupted
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or if partial writes occur. Return the number of bytes successfully
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written, setting errno if that is less than COUNT. */
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size_t
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full_write (int fd, const void *buf, size_t count)
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{
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size_t total_written = 0;
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const char *ptr = buf;
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while (count > 0)
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{
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size_t written = safe_write (fd, ptr, count);
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if (written == (size_t)-1)
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break;
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if (written == 0)
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{
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/* Some buggy drivers return 0 when you fall off a device's
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end. (Example: Linux 1.2.13 on /dev/fd0.) */
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errno = ENOSPC;
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break;
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}
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total_written += written;
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ptr += written;
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count -= written;
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}
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return total_written;
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}
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