Absolute File Name: | /home/opencoverage/opencoverage/guest-scripts/coreutils/src/gnulib/lib/full-write.c |
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1 | /* An interface to read and write that retries (if necessary) until complete. | - | ||||||
2 | - | |||||||
3 | Copyright (C) 1993-1994, 1997-2006, 2009-2018 Free Software Foundation, Inc. | - | ||||||
4 | - | |||||||
5 | This program is free software: you can redistribute it and/or modify | - | ||||||
6 | it under the terms of the GNU General Public License as published by | - | ||||||
7 | the Free Software Foundation; either version 3 of the License, or | - | ||||||
8 | (at your option) any later version. | - | ||||||
9 | - | |||||||
10 | This program is distributed in the hope that it will be useful, | - | ||||||
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | - | ||||||
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | - | ||||||
13 | GNU General Public License for more details. | - | ||||||
14 | - | |||||||
15 | You should have received a copy of the GNU General Public License | - | ||||||
16 | along with this program. If not, see <https://www.gnu.org/licenses/>. */ | - | ||||||
17 | - | |||||||
18 | #include <config.h> | - | ||||||
19 | - | |||||||
20 | /* Specification. */ | - | ||||||
21 | #ifdef FULL_READ | - | ||||||
22 | # include "full-read.h" | - | ||||||
23 | #else | - | ||||||
24 | # include "full-write.h" | - | ||||||
25 | #endif | - | ||||||
26 | - | |||||||
27 | #include <errno.h> | - | ||||||
28 | - | |||||||
29 | #ifdef FULL_READ | - | ||||||
30 | # include "safe-read.h" | - | ||||||
31 | # define safe_rw safe_read | - | ||||||
32 | # define full_rw full_read | - | ||||||
33 | # undef const | - | ||||||
34 | # define const /* empty */ | - | ||||||
35 | #else | - | ||||||
36 | # include "safe-write.h" | - | ||||||
37 | # define safe_rw safe_write | - | ||||||
38 | # define full_rw full_write | - | ||||||
39 | #endif | - | ||||||
40 | - | |||||||
41 | #ifdef FULL_READ | - | ||||||
42 | /* Set errno to zero upon EOF. */ | - | ||||||
43 | # define ZERO_BYTE_TRANSFER_ERRNO 0 | - | ||||||
44 | #else | - | ||||||
45 | /* Some buggy drivers return 0 when one tries to write beyond | - | ||||||
46 | a device's end. (Example: Linux 1.2.13 on /dev/fd0.) | - | ||||||
47 | Set errno to ENOSPC so they get a sensible diagnostic. */ | - | ||||||
48 | # define ZERO_BYTE_TRANSFER_ERRNO ENOSPC | - | ||||||
49 | #endif | - | ||||||
50 | - | |||||||
51 | /* Write(read) COUNT bytes at BUF to(from) descriptor FD, retrying if | - | ||||||
52 | interrupted or if a partial write(read) occurs. Return the number | - | ||||||
53 | of bytes transferred. | - | ||||||
54 | When writing, set errno if fewer than COUNT bytes are written. | - | ||||||
55 | When reading, if fewer than COUNT bytes are read, you must examine | - | ||||||
56 | errno to distinguish failure from EOF (errno == 0). */ | - | ||||||
57 | size_t | - | ||||||
58 | full_rw (int fd, const void *buf, size_t count) | - | ||||||
59 | { | - | ||||||
60 | size_t total = 0; | - | ||||||
61 | const char *ptr = (const char *) buf; | - | ||||||
62 | - | |||||||
63 | while (count > 0)
| 36861-38821 | ||||||
64 | { | - | ||||||
65 | size_t n_rw = safe_rw (fd, ptr, count); | - | ||||||
66 | if (n_rw == (size_t) -1)
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67 | break; executed 102 times by 3 tests: break; Executed by:
| 102 | ||||||
68 | if (n_rw == 0)
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69 | { | - | ||||||
70 | errno = ZERO_BYTE_TRANSFER_ERRNO; | - | ||||||
71 | break; executed 970 times by 2 tests: break; Executed by:
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72 | } | - | ||||||
73 | total += n_rw; | - | ||||||
74 | ptr += n_rw; | - | ||||||
75 | count -= n_rw; | - | ||||||
76 | } executed 37746 times by 8 tests: end of block Executed by:
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77 | - | |||||||
78 | return total; executed 37933 times by 8 tests: return total; Executed by:
| 37933 | ||||||
79 | } | - | ||||||
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