Permalink
Cannot retrieve contributors at this time
Name already in use
A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?
glibc/libio/memstream.c
Go to fileThis commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
141 lines (116 sloc)
3.92 KB
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/* Copyright (C) 1995-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include "libioP.h" | |
#include "strfile.h" | |
#include <stdio.h> | |
#include <stdlib.h> | |
struct _IO_FILE_memstream | |
{ | |
_IO_strfile _sf; | |
char **bufloc; | |
_IO_size_t *sizeloc; | |
}; | |
static int _IO_mem_sync (_IO_FILE* fp) __THROW; | |
static void _IO_mem_finish (_IO_FILE* fp, int) __THROW; | |
static const struct _IO_jump_t _IO_mem_jumps = | |
{ | |
JUMP_INIT_DUMMY, | |
JUMP_INIT (finish, _IO_mem_finish), | |
JUMP_INIT (overflow, _IO_str_overflow), | |
JUMP_INIT (underflow, _IO_str_underflow), | |
JUMP_INIT (uflow, _IO_default_uflow), | |
JUMP_INIT (pbackfail, _IO_str_pbackfail), | |
JUMP_INIT (xsputn, _IO_default_xsputn), | |
JUMP_INIT (xsgetn, _IO_default_xsgetn), | |
JUMP_INIT (seekoff, _IO_str_seekoff), | |
JUMP_INIT (seekpos, _IO_default_seekpos), | |
JUMP_INIT (setbuf, _IO_default_setbuf), | |
JUMP_INIT (sync, _IO_mem_sync), | |
JUMP_INIT (doallocate, _IO_default_doallocate), | |
JUMP_INIT (read, _IO_default_read), | |
JUMP_INIT (write, _IO_default_write), | |
JUMP_INIT (seek, _IO_default_seek), | |
JUMP_INIT (close, _IO_default_close), | |
JUMP_INIT (stat, _IO_default_stat), | |
JUMP_INIT(showmanyc, _IO_default_showmanyc), | |
JUMP_INIT(imbue, _IO_default_imbue) | |
}; | |
/* Open a stream that writes into a malloc'd buffer that is expanded as | |
necessary. *BUFLOC and *SIZELOC are updated with the buffer's location | |
and the number of characters written on fflush or fclose. */ | |
_IO_FILE * | |
__open_memstream (char **bufloc, _IO_size_t *sizeloc) | |
{ | |
struct locked_FILE | |
{ | |
struct _IO_FILE_memstream fp; | |
#ifdef _IO_MTSAFE_IO | |
_IO_lock_t lock; | |
#endif | |
struct _IO_wide_data wd; | |
} *new_f; | |
char *buf; | |
new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE)); | |
if (new_f == NULL) | |
return NULL; | |
#ifdef _IO_MTSAFE_IO | |
new_f->fp._sf._sbf._f._lock = &new_f->lock; | |
#endif | |
buf = calloc (1, _IO_BUFSIZ); | |
if (buf == NULL) | |
{ | |
free (new_f); | |
return NULL; | |
} | |
_IO_init (&new_f->fp._sf._sbf._f, 0); | |
_IO_JUMPS_FILE_plus (&new_f->fp._sf._sbf) = &_IO_mem_jumps; | |
_IO_str_init_static_internal (&new_f->fp._sf, buf, _IO_BUFSIZ, buf); | |
new_f->fp._sf._sbf._f._flags &= ~_IO_USER_BUF; | |
new_f->fp._sf._s._allocate_buffer = (_IO_alloc_type) malloc; | |
new_f->fp._sf._s._free_buffer = (_IO_free_type) free; | |
new_f->fp.bufloc = bufloc; | |
new_f->fp.sizeloc = sizeloc; | |
return (_IO_FILE *) &new_f->fp._sf._sbf; | |
} | |
libc_hidden_def (__open_memstream) | |
weak_alias (__open_memstream, open_memstream) | |
static int | |
_IO_mem_sync (_IO_FILE *fp) | |
{ | |
struct _IO_FILE_memstream *mp = (struct _IO_FILE_memstream *) fp; | |
if (fp->_IO_write_ptr == fp->_IO_write_end) | |
{ | |
_IO_str_overflow (fp, '\0'); | |
--fp->_IO_write_ptr; | |
} | |
else | |
*fp->_IO_write_ptr = '\0'; | |
*mp->bufloc = fp->_IO_write_base; | |
*mp->sizeloc = fp->_IO_write_ptr - fp->_IO_write_base; | |
return 0; | |
} | |
static void | |
_IO_mem_finish (_IO_FILE *fp, int dummy) | |
{ | |
struct _IO_FILE_memstream *mp = (struct _IO_FILE_memstream *) fp; | |
*mp->bufloc = (char *) realloc (fp->_IO_write_base, | |
fp->_IO_write_ptr - fp->_IO_write_base + 1); | |
if (*mp->bufloc != NULL) | |
{ | |
(*mp->bufloc)[fp->_IO_write_ptr - fp->_IO_write_base] = '\0'; | |
*mp->sizeloc = fp->_IO_write_ptr - fp->_IO_write_base; | |
fp->_IO_buf_base = NULL; | |
} | |
_IO_str_finish (fp, 0); | |
} |