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b168057a | 1 | /* Copyright (C) 1994-2015 Free Software Foundation, Inc. |
41bdb6e2 | 2 | This file is part of the GNU C Library. |
d64b6ad0 | 3 | |
41bdb6e2 AJ |
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. | |
d64b6ad0 | 8 | |
41bdb6e2 AJ |
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 | |
d64b6ad0 | 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
41bdb6e2 AJ |
12 | Lesser General Public License for more details. |
13 | ||
14 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. | |
41bdb6e2 AJ |
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. */ | |
d64b6ad0 UD |
26 | |
27 | #include "libioP.h" | |
28 | #include "strfile.h" | |
29 | ||
30 | ||
79937577 | 31 | static wint_t _IO_wstrn_overflow (_IO_FILE *fp, wint_t c) __THROW; |
d64b6ad0 UD |
32 | |
33 | static wint_t | |
9d46370c | 34 | _IO_wstrn_overflow (_IO_FILE *fp, wint_t c) |
d64b6ad0 UD |
35 | { |
36 | /* When we come to here this means the user supplied buffer is | |
37 | filled. But since we must return the number of characters which | |
38 | would have been written in total we must provide a buffer for | |
39 | further use. We can do this by writing on and on in the overflow | |
b5cc329c UD |
40 | buffer in the _IO_wstrnfile structure. */ |
41 | _IO_wstrnfile *snf = (_IO_wstrnfile *) fp; | |
d64b6ad0 UD |
42 | |
43 | if (fp->_wide_data->_IO_buf_base != snf->overflow_buf) | |
44 | { | |
d18ea0c5 AS |
45 | _IO_wsetb (fp, snf->overflow_buf, |
46 | snf->overflow_buf + (sizeof (snf->overflow_buf) | |
47 | / sizeof (wchar_t)), 0); | |
d64b6ad0 UD |
48 | |
49 | fp->_wide_data->_IO_write_base = snf->overflow_buf; | |
50 | fp->_wide_data->_IO_read_base = snf->overflow_buf; | |
51 | fp->_wide_data->_IO_read_ptr = snf->overflow_buf; | |
52 | fp->_wide_data->_IO_read_end = (snf->overflow_buf | |
53 | + (sizeof (snf->overflow_buf) | |
54 | / sizeof (wchar_t))); | |
55 | } | |
56 | ||
57 | fp->_wide_data->_IO_write_ptr = snf->overflow_buf; | |
58 | fp->_wide_data->_IO_write_end = snf->overflow_buf; | |
59 | ||
60 | /* Since we are not really interested in storing the characters | |
61 | which do not fit in the buffer we simply ignore it. */ | |
62 | return c; | |
63 | } | |
64 | ||
65 | ||
8215c9ec | 66 | const struct _IO_jump_t _IO_wstrn_jumps attribute_hidden = |
d64b6ad0 UD |
67 | { |
68 | JUMP_INIT_DUMMY, | |
69 | JUMP_INIT(finish, _IO_wstr_finish), | |
70 | JUMP_INIT(overflow, (_IO_overflow_t) _IO_wstrn_overflow), | |
71 | JUMP_INIT(underflow, (_IO_underflow_t) _IO_wstr_underflow), | |
d18ea0c5 | 72 | JUMP_INIT(uflow, (_IO_underflow_t) _IO_wdefault_uflow), |
d64b6ad0 | 73 | JUMP_INIT(pbackfail, (_IO_pbackfail_t) _IO_wstr_pbackfail), |
d18ea0c5 AS |
74 | JUMP_INIT(xsputn, _IO_wdefault_xsputn), |
75 | JUMP_INIT(xsgetn, _IO_wdefault_xsgetn), | |
d64b6ad0 UD |
76 | JUMP_INIT(seekoff, _IO_wstr_seekoff), |
77 | JUMP_INIT(seekpos, _IO_default_seekpos), | |
bff334e0 | 78 | JUMP_INIT(setbuf, _IO_default_setbuf), |
d64b6ad0 | 79 | JUMP_INIT(sync, _IO_default_sync), |
d18ea0c5 | 80 | JUMP_INIT(doallocate, _IO_wdefault_doallocate), |
d64b6ad0 UD |
81 | JUMP_INIT(read, _IO_default_read), |
82 | JUMP_INIT(write, _IO_default_write), | |
83 | JUMP_INIT(seek, _IO_default_seek), | |
84 | JUMP_INIT(close, _IO_default_close), | |
85 | JUMP_INIT(stat, _IO_default_stat), | |
86 | JUMP_INIT(showmanyc, _IO_default_showmanyc), | |
87 | JUMP_INIT(imbue, _IO_default_imbue) | |
88 | }; | |
89 | ||
90 | ||
91 | int | |
92 | _IO_vswprintf (string, maxlen, format, args) | |
93 | wchar_t *string; | |
94 | _IO_size_t maxlen; | |
95 | const wchar_t *format; | |
96 | _IO_va_list args; | |
97 | { | |
b5cc329c | 98 | _IO_wstrnfile sf; |
d64b6ad0 UD |
99 | int ret; |
100 | struct _IO_wide_data wd; | |
101 | #ifdef _IO_MTSAFE_IO | |
c020d48c | 102 | sf.f._sbf._f._lock = NULL; |
d64b6ad0 UD |
103 | #endif |
104 | ||
d64b6ad0 | 105 | if (maxlen == 0) |
5569e0a6 UD |
106 | /* Since we have to write at least the terminating L'\0' a buffer |
107 | length of zero always makes the function fail. */ | |
108 | return -1; | |
d64b6ad0 | 109 | |
c020d48c | 110 | _IO_no_init (&sf.f._sbf._f, _IO_USER_LOCK, 0, &wd, &_IO_wstrn_jumps); |
d64b6ad0 UD |
111 | _IO_fwide (&sf.f._sbf._f, 1); |
112 | string[0] = L'\0'; | |
e1b13a63 | 113 | _IO_wstr_init_static (&sf.f._sbf._f, string, maxlen - 1, string); |
41d998a6 | 114 | ret = _IO_vfwprintf ((_IO_FILE *) &sf.f._sbf, format, args); |
d64b6ad0 | 115 | |
5569e0a6 UD |
116 | if (sf.f._sbf._f._wide_data->_IO_buf_base == sf.overflow_buf) |
117 | /* ISO C99 requires swprintf/vswprintf to return an error if the | |
11bf311e | 118 | output does not fit in the provided buffer. */ |
5569e0a6 UD |
119 | return -1; |
120 | ||
121 | /* Terminate the string. */ | |
122 | *sf.f._sbf._f._wide_data->_IO_write_ptr = '\0'; | |
123 | ||
d64b6ad0 UD |
124 | return ret; |
125 | } | |
d64b6ad0 | 126 | weak_alias (_IO_vswprintf, __vswprintf) |
c6251f03 | 127 | ldbl_weak_alias (_IO_vswprintf, vswprintf) |