PowerPC: Add fenv macros for long double
[glibc.git] / libio / memstream.c
blobddb64a01b7c4278462d262e532bf411126aaa61b
1 /* Copyright (C) 1995-2014 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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/>. */
18 #include "libioP.h"
19 #include "strfile.h"
20 #include <stdio.h>
21 #include <stdlib.h>
24 struct _IO_FILE_memstream
26 _IO_strfile _sf;
27 char **bufloc;
28 _IO_size_t *sizeloc;
32 static int _IO_mem_sync (_IO_FILE* fp) __THROW;
33 static void _IO_mem_finish (_IO_FILE* fp, int) __THROW;
36 static const struct _IO_jump_t _IO_mem_jumps =
38 JUMP_INIT_DUMMY,
39 JUMP_INIT (finish, _IO_mem_finish),
40 JUMP_INIT (overflow, _IO_str_overflow),
41 JUMP_INIT (underflow, _IO_str_underflow),
42 JUMP_INIT (uflow, _IO_default_uflow),
43 JUMP_INIT (pbackfail, _IO_str_pbackfail),
44 JUMP_INIT (xsputn, _IO_default_xsputn),
45 JUMP_INIT (xsgetn, _IO_default_xsgetn),
46 JUMP_INIT (seekoff, _IO_str_seekoff),
47 JUMP_INIT (seekpos, _IO_default_seekpos),
48 JUMP_INIT (setbuf, _IO_default_setbuf),
49 JUMP_INIT (sync, _IO_mem_sync),
50 JUMP_INIT (doallocate, _IO_default_doallocate),
51 JUMP_INIT (read, _IO_default_read),
52 JUMP_INIT (write, _IO_default_write),
53 JUMP_INIT (seek, _IO_default_seek),
54 JUMP_INIT (close, _IO_default_close),
55 JUMP_INIT (stat, _IO_default_stat),
56 JUMP_INIT(showmanyc, _IO_default_showmanyc),
57 JUMP_INIT(imbue, _IO_default_imbue)
60 /* Open a stream that writes into a malloc'd buffer that is expanded as
61 necessary. *BUFLOC and *SIZELOC are updated with the buffer's location
62 and the number of characters written on fflush or fclose. */
63 _IO_FILE *
64 open_memstream (bufloc, sizeloc)
65 char **bufloc;
66 _IO_size_t *sizeloc;
68 struct locked_FILE
70 struct _IO_FILE_memstream fp;
71 #ifdef _IO_MTSAFE_IO
72 _IO_lock_t lock;
73 #endif
74 struct _IO_wide_data wd;
75 } *new_f;
76 char *buf;
78 new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE));
79 if (new_f == NULL)
80 return NULL;
81 #ifdef _IO_MTSAFE_IO
82 new_f->fp._sf._sbf._f._lock = &new_f->lock;
83 #endif
85 buf = calloc (1, _IO_BUFSIZ);
86 if (buf == NULL)
88 free (new_f);
89 return NULL;
91 _IO_init (&new_f->fp._sf._sbf._f, 0);
92 _IO_JUMPS ((struct _IO_FILE_plus *) &new_f->fp._sf._sbf) = &_IO_mem_jumps;
93 _IO_str_init_static_internal (&new_f->fp._sf, buf, _IO_BUFSIZ, buf);
94 new_f->fp._sf._sbf._f._flags &= ~_IO_USER_BUF;
95 new_f->fp._sf._s._allocate_buffer = (_IO_alloc_type) malloc;
96 new_f->fp._sf._s._free_buffer = (_IO_free_type) free;
98 new_f->fp.bufloc = bufloc;
99 new_f->fp.sizeloc = sizeloc;
101 return (_IO_FILE *) &new_f->fp._sf._sbf;
103 libc_hidden_def (open_memstream)
106 static int
107 _IO_mem_sync (fp)
108 _IO_FILE* fp;
110 struct _IO_FILE_memstream *mp = (struct _IO_FILE_memstream *) fp;
112 if (fp->_IO_write_ptr == fp->_IO_write_end)
114 _IO_str_overflow (fp, '\0');
115 --fp->_IO_write_ptr;
117 else
118 *fp->_IO_write_ptr = '\0';
120 *mp->bufloc = fp->_IO_write_base;
121 *mp->sizeloc = fp->_IO_write_ptr - fp->_IO_write_base;
123 return 0;
127 static void
128 _IO_mem_finish (fp, dummy)
129 _IO_FILE* fp;
130 int dummy;
132 struct _IO_FILE_memstream *mp = (struct _IO_FILE_memstream *) fp;
134 *mp->bufloc = (char *) realloc (fp->_IO_write_base,
135 fp->_IO_write_ptr - fp->_IO_write_base + 1);
136 if (*mp->bufloc != NULL)
138 (*mp->bufloc)[fp->_IO_write_ptr - fp->_IO_write_base] = '\0';
139 *mp->sizeloc = fp->_IO_write_ptr - fp->_IO_write_base;
141 fp->_IO_buf_base = NULL;
144 _IO_str_finish (fp, 0);