Mercurial > hg > octave-shane > gnulib-hg

annotate lib/full-write.c @ 17255:d81be792518a

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update from texinfo
author Karl Berry <karl@freefriends.org>
date Tue, 01 Jan 2013 15:51:49 -0800
parents e542fd46ad6f
children 344018b6e5d7
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1 /* An interface to read and write that retries (if necessary) until complete.
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2
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3 Copyright (C) 1993-1994, 1997-2006, 2009-2013 Free Software Foundation, Inc.
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4
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5 This program is free software: you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 3 of the License, or
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8 (at your option) any later version.
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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15 You should have received a copy of the GNU General Public License
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16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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18 #include <config.h>
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20 /* Specification. */
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21 #ifdef FULL_READ
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22 # include "full-read.h"
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23 #else
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24 # include "full-write.h"
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25 #endif
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27 #include <errno.h>
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29 #ifdef FULL_READ
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30 # include "safe-read.h"
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31 # define safe_rw safe_read
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32 # define full_rw full_read
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33 # undef const
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34 # define const /* empty */
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35 #else
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36 # include "safe-write.h"
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37 # define safe_rw safe_write
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38 # define full_rw full_write
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39 #endif
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41 #ifdef FULL_READ
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42 /* Set errno to zero upon EOF. */
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43 # define ZERO_BYTE_TRANSFER_ERRNO 0
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44 #else
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45 /* Some buggy drivers return 0 when one tries to write beyond
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46 a device's end. (Example: Linux 1.2.13 on /dev/fd0.)
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47 Set errno to ENOSPC so they get a sensible diagnostic. */
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48 # define ZERO_BYTE_TRANSFER_ERRNO ENOSPC
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49 #endif
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51 /* Write(read) COUNT bytes at BUF to(from) descriptor FD, retrying if
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52 interrupted or if a partial write(read) occurs. Return the number
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53 of bytes transferred.
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54 When writing, set errno if fewer than COUNT bytes are written.
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55 When reading, if fewer than COUNT bytes are read, you must examine
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56 errno to distinguish failure from EOF (errno == 0). */
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57 size_t
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58 full_rw (int fd, const void *buf, size_t count)
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59 {
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60 size_t total = 0;
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61 const char *ptr = (const char *) buf;
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63 while (count > 0)
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64 {
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65 size_t n_rw = safe_rw (fd, ptr, count);
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66 if (n_rw == (size_t) -1)
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67 break;
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68 if (n_rw == 0)
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69 {
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70 errno = ZERO_BYTE_TRANSFER_ERRNO;
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71 break;
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72 }
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73 total += n_rw;
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74 ptr += n_rw;
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75 count -= n_rw;
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76 }
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78 return total;
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79 }