diff options
Diffstat (limited to 'lib/full-write.c')
-rw-r--r-- | lib/full-write.c | 83 |
1 files changed, 0 insertions, 83 deletions
diff --git a/lib/full-write.c b/lib/full-write.c deleted file mode 100644 index 106f3c7e..00000000 --- a/lib/full-write.c +++ /dev/null | |||
@@ -1,83 +0,0 @@ | |||
1 | /* An interface to read and write that retries (if necessary) until complete. | ||
2 | |||
3 | Copyright (C) 1993, 1994, 1997, 1998, 1999, 2000, 2001, 2002, 2003, | ||
4 | 2004 Free Software Foundation, Inc. | ||
5 | |||
6 | This program is free software; you can redistribute it and/or modify | ||
7 | it under the terms of the GNU General Public License as published by | ||
8 | the Free Software Foundation; either version 2, or (at your option) | ||
9 | any later version. | ||
10 | |||
11 | This program is distributed in the hope that it will be useful, | ||
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
14 | GNU General Public License for more details. | ||
15 | |||
16 | You should have received a copy of the GNU General Public License | ||
17 | along with this program; if not, write to the Free Software Foundation, | ||
18 | Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ | ||
19 | |||
20 | #ifdef HAVE_CONFIG_H | ||
21 | # include <config.h> | ||
22 | #endif | ||
23 | |||
24 | /* Specification. */ | ||
25 | #ifdef FULL_READ | ||
26 | # include "full-read.h" | ||
27 | #else | ||
28 | # include "full-write.h" | ||
29 | #endif | ||
30 | |||
31 | #include <errno.h> | ||
32 | |||
33 | #ifdef FULL_READ | ||
34 | # include "safe-read.h" | ||
35 | # define safe_rw safe_read | ||
36 | # define full_rw full_read | ||
37 | # undef const | ||
38 | # define const /* empty */ | ||
39 | #else | ||
40 | # include "safe-write.h" | ||
41 | # define safe_rw safe_write | ||
42 | # define full_rw full_write | ||
43 | #endif | ||
44 | |||
45 | #ifdef FULL_READ | ||
46 | /* Set errno to zero upon EOF. */ | ||
47 | # define ZERO_BYTE_TRANSFER_ERRNO 0 | ||
48 | #else | ||
49 | /* Some buggy drivers return 0 when one tries to write beyond | ||
50 | a device's end. (Example: Linux 1.2.13 on /dev/fd0.) | ||
51 | Set errno to ENOSPC so they get a sensible diagnostic. */ | ||
52 | # define ZERO_BYTE_TRANSFER_ERRNO ENOSPC | ||
53 | #endif | ||
54 | |||
55 | /* Write(read) COUNT bytes at BUF to(from) descriptor FD, retrying if | ||
56 | interrupted or if a partial write(read) occurs. Return the number | ||
57 | of bytes transferred. | ||
58 | When writing, set errno if fewer than COUNT bytes are written. | ||
59 | When reading, if fewer than COUNT bytes are read, you must examine | ||
60 | errno to distinguish failure from EOF (errno == 0). */ | ||
61 | size_t | ||
62 | full_rw (int fd, const void *buf, size_t count) | ||
63 | { | ||
64 | size_t total = 0; | ||
65 | const char *ptr = buf; | ||
66 | |||
67 | while (count > 0) | ||
68 | { | ||
69 | size_t n_rw = safe_rw (fd, ptr, count); | ||
70 | if (n_rw == (size_t) -1) | ||
71 | break; | ||
72 | if (n_rw == 0) | ||
73 | { | ||
74 | errno = ZERO_BYTE_TRANSFER_ERRNO; | ||
75 | break; | ||
76 | } | ||
77 | total += n_rw; | ||
78 | ptr += n_rw; | ||
79 | count -= n_rw; | ||
80 | } | ||
81 | |||
82 | return total; | ||
83 | } | ||