293 lines
7.5 KiB
C
293 lines
7.5 KiB
C
/*
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Copyright (C) 1993 Free Software Foundation
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This file is part of the GNU IO Library. This library is free
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software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option)
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any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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As a special exception, if you link this library with files
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compiled with a GNU compiler to produce an executable, this does not cause
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the resulting executable to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why
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the executable file might be covered by the GNU General Public License. */
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#include "strfile.h"
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#include "libioP.h"
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#include <string.h>
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#define LEN(fp) (((_IO_strfile*)(fp))->_s._len)
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#ifdef TODO
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/* An "unbounded buffer" is when a buffer is supplied, but with no
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specified length. An example is the buffer argument to sprintf.
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*/
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#endif
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void
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_IO_str_init_static (fp, ptr, size, pstart)
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_IO_FILE *fp;
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char *ptr;
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int size;
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char *pstart;
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{
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if (size == 0)
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size = strlen(ptr);
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else if (size < 0)
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{
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/* If size is negative 'the characters are assumed to
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continue indefinitely.' This is kind of messy ... */
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#if 1
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int s;
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size = 512;
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/* Try increasing powers of 2, as long as we don't wrap around.
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This can lose in pathological cases (ptr near the end
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of the address space). A better solution might be to
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adjust the size on underflow/overflow. FIXME. */
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for (s; s = 2*size, s > 0 && ptr + s > ptr && s < 0x4000000L; )
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size = s;
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size = s;
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#else
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/* The following semi-portable kludge assumes that
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sizeof(unsigned long) == sizeof(char*). Hence,
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(unsigned long)(-1) should be the largest possible address. */
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unsigned long highest = (unsigned long)(-1);
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/* Pointers are signed on some brain-damaged systems, in
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which case we divide by two to get the maximum signed address. */
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if ((char*)highest < ptr)
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highest >>= 1;
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size = (char*)highest - ptr;
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#endif
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}
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_IO_setb(fp, ptr, ptr+size, 0);
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fp->_IO_write_base = ptr;
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fp->_IO_read_base = ptr;
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fp->_IO_read_ptr = ptr;
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if (pstart)
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{
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fp->_IO_write_ptr = pstart;
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fp->_IO_write_end = ptr+size;
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fp->_IO_read_end = pstart;
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}
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else
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{
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fp->_IO_write_ptr = ptr;
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fp->_IO_write_end = ptr;
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fp->_IO_read_end = ptr+size;
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}
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LEN(fp) = size;
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/* A null _allocate_buffer function flags the strfile as being static. */
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(((_IO_strfile*)(fp))->_s._allocate_buffer) = (_IO_alloc_type)0;
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}
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void
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_IO_str_init_readonly (fp, ptr, size)
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_IO_FILE *fp;
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const char *ptr;
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int size;
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{
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_IO_str_init_static (fp, (char*)ptr, size, NULL);
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fp->_IO_file_flags |= _IO_NO_WRITES;
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}
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int _IO_str_overflow (fp, c)
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register _IO_FILE* fp;
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int c;
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{
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int flush_only = c == EOF;
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_IO_size_t pos = fp->_IO_write_ptr - fp->_IO_write_base;
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_IO_size_t get_pos = fp->_IO_read_ptr - fp->_IO_read_base;
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if (fp->_flags & _IO_NO_WRITES)
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return flush_only ? 0 : EOF;
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if (pos > LEN(fp)) LEN(fp) = pos;
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if ((fp->_flags & _IO_TIED_PUT_GET) && !(fp->_flags & _IO_CURRENTLY_PUTTING))
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{
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pos = get_pos;
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fp->_flags |= _IO_CURRENTLY_PUTTING;
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get_pos = LEN(fp);
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}
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if (pos >= _IO_blen(fp) + flush_only)
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{
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if (fp->_flags & _IO_USER_BUF) /* not allowed to enlarge */
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{
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#ifdef TODO
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if (indefinite size)
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{
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fp->_IO_buf_end += 512;
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}
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else
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#endif
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return EOF;
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}
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else
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{
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char *new_buf;
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_IO_size_t new_size = 2 * _IO_blen(fp);
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new_buf
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= (char*)(*((_IO_strfile*)fp)->_s._allocate_buffer)(new_size);
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if (new_buf == NULL)
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{
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/* __ferror(fp) = 1; */
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return EOF;
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}
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memcpy(new_buf, fp->_IO_buf_base, _IO_blen(fp));
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#if 0
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if (lenp == &LEN(fp)) /* use '\0'-filling */
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memset(new_buf + pos, 0, blen() - pos);
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#endif
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if (fp->_IO_buf_base)
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{
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(*((_IO_strfile*)fp)->_s._free_buffer)(fp->_IO_buf_base);
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/* Make sure _IO_setb won't try to delete _IO_buf_base. */
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fp->_IO_buf_base = NULL;
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}
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_IO_setb(fp, new_buf, new_buf + new_size, 1);
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fp->_IO_write_base = new_buf;
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}
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fp->_IO_write_end = fp->_IO_buf_end;
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}
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fp->_IO_write_ptr = fp->_IO_buf_base + pos;
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fp->_IO_read_base = fp->_IO_buf_base;
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fp->_IO_read_ptr = fp->_IO_buf_base + get_pos;;
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fp->_IO_read_end = fp->_IO_buf_base + LEN(fp);;
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if (!flush_only)
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*fp->_IO_write_ptr++ = (unsigned char) c;
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return c;
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}
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int
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_IO_str_underflow (fp)
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register _IO_FILE* fp;
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{
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_IO_size_t ppos = fp->_IO_write_ptr - fp->_IO_write_base;
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if (ppos > LEN(fp)) LEN(fp) = ppos;
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if ((fp->_flags & _IO_TIED_PUT_GET) && (fp->_flags & _IO_CURRENTLY_PUTTING))
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{
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fp->_flags &= ~_IO_CURRENTLY_PUTTING;
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fp->_IO_write_ptr = fp->_IO_write_end;
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}
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fp->_IO_read_end = fp->_IO_read_base + LEN(fp);
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if (fp->_IO_read_ptr < fp->_IO_read_end)
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return *fp->_IO_read_ptr;
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else
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return EOF;
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}
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_IO_ssize_t
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_IO_str_count (fp)
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register _IO_FILE *fp;
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{
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_IO_ssize_t put_len = fp->_IO_write_ptr - fp->_IO_write_base;
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if (put_len < ((_IO_strfile*)fp)->_s._len)
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put_len = ((_IO_strfile*)fp)->_s._len;
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return put_len;
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}
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_IO_pos_t
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_IO_str_seekoff(fp, offset, mode)
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register _IO_FILE *fp;
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_IO_off_t offset;
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_IO_seekflags mode;
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{
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_IO_ssize_t cur_size = _IO_str_count(fp);
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_IO_pos_t new_pos = EOF;
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int dir = mode & 3;
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/* Move the get pointer, if requested. */
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if (!(mode & _IO_seek_not_in))
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{
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switch (dir)
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{
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case _IO_seek_end:
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offset += cur_size;
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break;
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case _IO_seek_cur:
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offset += fp->_IO_read_ptr - fp->_IO_read_base;
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break;
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default: /* case _IO_seek_set: */
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break;
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}
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if (offset < 0 || (_IO_size_t)offset > cur_size)
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return EOF;
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fp->_IO_read_ptr = fp->_IO_read_base + offset;
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fp->_IO_read_end = fp->_IO_read_base + cur_size;
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new_pos = offset;
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}
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/* Move the put pointer, if requested. */
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if (!(mode & _IO_seek_not_out))
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{
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switch (dir)
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{
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case _IO_seek_end:
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offset += cur_size;
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break;
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case _IO_seek_cur:
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offset += fp->_IO_write_ptr - fp->_IO_write_base;
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break;
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default: /* case _IO_seek_set: */
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break;
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}
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if (offset < 0 || (_IO_size_t)offset > cur_size)
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return EOF;
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fp->_IO_write_ptr = fp->_IO_write_base + offset;
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new_pos = offset;
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}
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return new_pos;
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}
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int
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_IO_str_pbackfail(fp, c)
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register _IO_FILE *fp;
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int c;
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{
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if ((fp->_flags & _IO_NO_WRITES) && c != EOF)
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return EOF;
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return _IO_default_pbackfail(fp, c);
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}
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void
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_IO_str_finish(fp)
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register _IO_FILE* fp;
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{
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if (fp->_IO_buf_base && !(fp->_flags & _IO_USER_BUF))
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(((_IO_strfile*)fp)->_s._free_buffer)(fp->_IO_buf_base);
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fp->_IO_buf_base = NULL;
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_IO_default_finish(fp);
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}
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struct _IO_jump_t _IO_str_jumps = {
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_IO_str_overflow,
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_IO_str_underflow,
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_IO_default_xsputn,
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_IO_default_xsgetn,
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_IO_default_read,
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_IO_default_write,
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_IO_default_doallocate,
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_IO_str_pbackfail,
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_IO_default_setbuf,
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_IO_default_sync,
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_IO_str_finish,
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_IO_default_close,
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_IO_default_stat,
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_IO_default_seek,
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_IO_str_seekoff,
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_IO_default_seekpos,
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_IO_default_uflow
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};
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