1 | /* Copyright (C) 1993-2016 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either |
7 | version 2.1 of the License, or (at your option) any later version. |
8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. |
17 | |
18 | As a special exception, if you link the code in this file with |
19 | files compiled with a GNU compiler to produce an executable, |
20 | that does not cause the resulting executable to be covered by |
21 | the GNU Lesser General Public License. This exception does not |
22 | however invalidate any other reasons why the executable file |
23 | might be covered by the GNU Lesser General Public License. |
24 | This exception applies to code released by its copyright holders |
25 | in files containing the exception. */ |
26 | |
27 | #include "libioP.h" |
28 | #include <string.h> |
29 | #include <wchar.h> |
30 | |
31 | #ifdef _LIBC |
32 | # define wmemcpy __wmemcpy |
33 | #endif |
34 | |
35 | _IO_size_t |
36 | _IO_getwline (_IO_FILE *fp, wchar_t *buf, _IO_size_t n, wint_t delim, |
37 | int ) |
38 | { |
39 | return _IO_getwline_info (fp, buf, n, delim, extract_delim, (wint_t *) 0); |
40 | } |
41 | |
42 | /* Algorithm based on that used by Berkeley pre-4.4 fgets implementation. |
43 | |
44 | Read chars into buf (of size n), until delim is seen. |
45 | Return number of chars read (at most n). |
46 | Does not put a terminating '\0' in buf. |
47 | If extract_delim < 0, leave delimiter unread. |
48 | If extract_delim > 0, insert delim in output. */ |
49 | |
50 | _IO_size_t |
51 | _IO_getwline_info (_IO_FILE *fp, wchar_t *buf, _IO_size_t n, wint_t delim, |
52 | int , wint_t *eof) |
53 | { |
54 | wchar_t *ptr = buf; |
55 | if (eof != NULL) |
56 | *eof = 0; |
57 | if (__builtin_expect (fp->_mode, 1) == 0) |
58 | _IO_fwide (fp, 1); |
59 | while (n != 0) |
60 | { |
61 | _IO_ssize_t len = (fp->_wide_data->_IO_read_end |
62 | - fp->_wide_data->_IO_read_ptr); |
63 | if (len <= 0) |
64 | { |
65 | wint_t wc = __wuflow (fp); |
66 | if (wc == WEOF) |
67 | { |
68 | if (eof) |
69 | *eof = wc; |
70 | break; |
71 | } |
72 | if (wc == delim) |
73 | { |
74 | if (extract_delim > 0) |
75 | *ptr++ = wc; |
76 | else if (extract_delim < 0) |
77 | _IO_sputbackc (fp, wc); |
78 | if (extract_delim > 0) |
79 | ++len; |
80 | return ptr - buf; |
81 | } |
82 | *ptr++ = wc; |
83 | n--; |
84 | } |
85 | else |
86 | { |
87 | wchar_t *t; |
88 | if ((_IO_size_t) len >= n) |
89 | len = n; |
90 | t = wmemchr ((void *) fp->_wide_data->_IO_read_ptr, delim, len); |
91 | if (t != NULL) |
92 | { |
93 | _IO_size_t old_len = ptr - buf; |
94 | len = t - fp->_wide_data->_IO_read_ptr; |
95 | if (extract_delim >= 0) |
96 | { |
97 | ++t; |
98 | if (extract_delim > 0) |
99 | ++len; |
100 | } |
101 | wmemcpy ((void *) ptr, (void *) fp->_wide_data->_IO_read_ptr, |
102 | len); |
103 | fp->_wide_data->_IO_read_ptr = t; |
104 | return old_len + len; |
105 | } |
106 | wmemcpy ((void *) ptr, (void *) fp->_wide_data->_IO_read_ptr, len); |
107 | fp->_wide_data->_IO_read_ptr += len; |
108 | ptr += len; |
109 | n -= len; |
110 | } |
111 | } |
112 | return ptr - buf; |
113 | } |
114 | |