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glibc/libio/strops.c
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/* Copyright (C) 1993-2016 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/>. | |
As a special exception, if you link the code in this file with | |
files compiled with a GNU compiler to produce an executable, | |
that does not cause the resulting executable to be covered by | |
the GNU Lesser General Public License. This exception does not | |
however invalidate any other reasons why the executable file | |
might be covered by the GNU Lesser General Public License. | |
This exception applies to code released by its copyright holders | |
in files containing the exception. */ | |
#include <assert.h> | |
#include "strfile.h" | |
#include "libioP.h" | |
#include <string.h> | |
#include <stdio_ext.h> | |
void | |
_IO_str_init_static_internal (_IO_strfile *sf, char *ptr, _IO_size_t size, | |
char *pstart) | |
{ | |
_IO_FILE *fp = &sf->_sbf._f; | |
char *end; | |
if (size == 0) | |
end = __rawmemchr (ptr, '\0'); | |
else if ((_IO_size_t) ptr + size > (_IO_size_t) ptr) | |
end = ptr + size; | |
else | |
end = (char *) -1; | |
_IO_setb (fp, ptr, end, 0); | |
fp->_IO_write_base = ptr; | |
fp->_IO_read_base = ptr; | |
fp->_IO_read_ptr = ptr; | |
if (pstart) | |
{ | |
fp->_IO_write_ptr = pstart; | |
fp->_IO_write_end = end; | |
fp->_IO_read_end = pstart; | |
} | |
else | |
{ | |
fp->_IO_write_ptr = ptr; | |
fp->_IO_write_end = ptr; | |
fp->_IO_read_end = end; | |
} | |
/* A null _allocate_buffer function flags the strfile as being static. */ | |
sf->_s._allocate_buffer = (_IO_alloc_type) 0; | |
} | |
void | |
_IO_str_init_static (_IO_strfile *sf, char *ptr, int size, char *pstart) | |
{ | |
return _IO_str_init_static_internal (sf, ptr, size < 0 ? -1 : size, pstart); | |
} | |
void | |
_IO_str_init_readonly (_IO_strfile *sf, const char *ptr, int size) | |
{ | |
_IO_str_init_static_internal (sf, (char *) ptr, size < 0 ? -1 : size, NULL); | |
sf->_sbf._f._IO_file_flags |= _IO_NO_WRITES; | |
} | |
int | |
_IO_str_overflow (_IO_FILE *fp, int c) | |
{ | |
int flush_only = c == EOF; | |
_IO_size_t pos; | |
if (fp->_flags & _IO_NO_WRITES) | |
return flush_only ? 0 : EOF; | |
if ((fp->_flags & _IO_TIED_PUT_GET) && !(fp->_flags & _IO_CURRENTLY_PUTTING)) | |
{ | |
fp->_flags |= _IO_CURRENTLY_PUTTING; | |
fp->_IO_write_ptr = fp->_IO_read_ptr; | |
fp->_IO_read_ptr = fp->_IO_read_end; | |
} | |
pos = fp->_IO_write_ptr - fp->_IO_write_base; | |
if (pos >= (_IO_size_t) (_IO_blen (fp) + flush_only)) | |
{ | |
if (fp->_flags & _IO_USER_BUF) /* not allowed to enlarge */ | |
return EOF; | |
else | |
{ | |
char *new_buf; | |
char *old_buf = fp->_IO_buf_base; | |
size_t old_blen = _IO_blen (fp); | |
_IO_size_t new_size = 2 * old_blen + 100; | |
if (new_size < old_blen) | |
return EOF; | |
new_buf | |
= (char *) (*((_IO_strfile *) fp)->_s._allocate_buffer) (new_size); | |
if (new_buf == NULL) | |
{ | |
/* __ferror(fp) = 1; */ | |
return EOF; | |
} | |
if (old_buf) | |
{ | |
memcpy (new_buf, old_buf, old_blen); | |
(*((_IO_strfile *) fp)->_s._free_buffer) (old_buf); | |
/* Make sure _IO_setb won't try to delete _IO_buf_base. */ | |
fp->_IO_buf_base = NULL; | |
} | |
memset (new_buf + old_blen, '\0', new_size - old_blen); | |
_IO_setb (fp, new_buf, new_buf + new_size, 1); | |
fp->_IO_read_base = new_buf + (fp->_IO_read_base - old_buf); | |
fp->_IO_read_ptr = new_buf + (fp->_IO_read_ptr - old_buf); | |
fp->_IO_read_end = new_buf + (fp->_IO_read_end - old_buf); | |
fp->_IO_write_ptr = new_buf + (fp->_IO_write_ptr - old_buf); | |
fp->_IO_write_base = new_buf; | |
fp->_IO_write_end = fp->_IO_buf_end; | |
} | |
} | |
if (!flush_only) | |
*fp->_IO_write_ptr++ = (unsigned char) c; | |
if (fp->_IO_write_ptr > fp->_IO_read_end) | |
fp->_IO_read_end = fp->_IO_write_ptr; | |
return c; | |
} | |
libc_hidden_def (_IO_str_overflow) | |
int | |
_IO_str_underflow (_IO_FILE *fp) | |
{ | |
if (fp->_IO_write_ptr > fp->_IO_read_end) | |
fp->_IO_read_end = fp->_IO_write_ptr; | |
if ((fp->_flags & _IO_TIED_PUT_GET) && (fp->_flags & _IO_CURRENTLY_PUTTING)) | |
{ | |
fp->_flags &= ~_IO_CURRENTLY_PUTTING; | |
fp->_IO_read_ptr = fp->_IO_write_ptr; | |
fp->_IO_write_ptr = fp->_IO_write_end; | |
} | |
if (fp->_IO_read_ptr < fp->_IO_read_end) | |
return *((unsigned char *) fp->_IO_read_ptr); | |
else | |
return EOF; | |
} | |
libc_hidden_def (_IO_str_underflow) | |
/* The size of the valid part of the buffer. */ | |
_IO_ssize_t | |
_IO_str_count (_IO_FILE *fp) | |
{ | |
return ((fp->_IO_write_ptr > fp->_IO_read_end | |
? fp->_IO_write_ptr : fp->_IO_read_end) | |
- fp->_IO_read_base); | |
} | |
static int | |
enlarge_userbuf (_IO_FILE *fp, _IO_off64_t offset, int reading) | |
{ | |
if ((_IO_ssize_t) offset <= _IO_blen (fp)) | |
return 0; | |
_IO_ssize_t oldend = fp->_IO_write_end - fp->_IO_write_base; | |
/* Try to enlarge the buffer. */ | |
if (fp->_flags & _IO_USER_BUF) | |
/* User-provided buffer. */ | |
return 1; | |
_IO_size_t newsize = offset + 100; | |
char *oldbuf = fp->_IO_buf_base; | |
char *newbuf | |
= (char *) (*((_IO_strfile *) fp)->_s._allocate_buffer) (newsize); | |
if (newbuf == NULL) | |
return 1; | |
if (oldbuf != NULL) | |
{ | |
memcpy (newbuf, oldbuf, _IO_blen (fp)); | |
(*((_IO_strfile *) fp)->_s._free_buffer) (oldbuf); | |
/* Make sure _IO_setb won't try to delete | |
_IO_buf_base. */ | |
fp->_IO_buf_base = NULL; | |
} | |
_IO_setb (fp, newbuf, newbuf + newsize, 1); | |
if (reading) | |
{ | |
fp->_IO_write_base = newbuf + (fp->_IO_write_base - oldbuf); | |
fp->_IO_write_ptr = newbuf + (fp->_IO_write_ptr - oldbuf); | |
fp->_IO_write_end = newbuf + (fp->_IO_write_end - oldbuf); | |
fp->_IO_read_ptr = newbuf + (fp->_IO_read_ptr - oldbuf); | |
fp->_IO_read_base = newbuf; | |
fp->_IO_read_end = fp->_IO_buf_end; | |
} | |
else | |
{ | |
fp->_IO_read_base = newbuf + (fp->_IO_read_base - oldbuf); | |
fp->_IO_read_ptr = newbuf + (fp->_IO_read_ptr - oldbuf); | |
fp->_IO_read_end = newbuf + (fp->_IO_read_end - oldbuf); | |
fp->_IO_write_ptr = newbuf + (fp->_IO_write_ptr - oldbuf); | |
fp->_IO_write_base = newbuf; | |
fp->_IO_write_end = fp->_IO_buf_end; | |
} | |
/* Clear the area between the last write position and th | |
new position. */ | |
assert (offset >= oldend); | |
if (reading) | |
memset (fp->_IO_read_base + oldend, '\0', offset - oldend); | |
else | |
memset (fp->_IO_write_base + oldend, '\0', offset - oldend); | |
return 0; | |
} | |
_IO_off64_t | |
_IO_str_seekoff (_IO_FILE *fp, _IO_off64_t offset, int dir, int mode) | |
{ | |
_IO_off64_t new_pos; | |
if (mode == 0 && (fp->_flags & _IO_TIED_PUT_GET)) | |
mode = (fp->_flags & _IO_CURRENTLY_PUTTING ? _IOS_OUTPUT : _IOS_INPUT); | |
if (mode == 0) | |
{ | |
/* Don't move any pointers. But there is no clear indication what | |
mode FP is in. Let's guess. */ | |
if (fp->_IO_file_flags & _IO_NO_WRITES) | |
new_pos = fp->_IO_read_ptr - fp->_IO_read_base; | |
else | |
new_pos = fp->_IO_write_ptr - fp->_IO_write_base; | |
} | |
else | |
{ | |
_IO_ssize_t cur_size = _IO_str_count(fp); | |
new_pos = EOF; | |
/* Move the get pointer, if requested. */ | |
if (mode & _IOS_INPUT) | |
{ | |
switch (dir) | |
{ | |
case _IO_seek_end: | |
offset += cur_size; | |
break; | |
case _IO_seek_cur: | |
offset += fp->_IO_read_ptr - fp->_IO_read_base; | |
break; | |
default: /* case _IO_seek_set: */ | |
break; | |
} | |
if (offset < 0) | |
return EOF; | |
if ((_IO_ssize_t) offset > cur_size | |
&& enlarge_userbuf (fp, offset, 1) != 0) | |
return EOF; | |
fp->_IO_read_ptr = fp->_IO_read_base + offset; | |
fp->_IO_read_end = fp->_IO_read_base + cur_size; | |
new_pos = offset; | |
} | |
/* Move the put pointer, if requested. */ | |
if (mode & _IOS_OUTPUT) | |
{ | |
switch (dir) | |
{ | |
case _IO_seek_end: | |
offset += cur_size; | |
break; | |
case _IO_seek_cur: | |
offset += fp->_IO_write_ptr - fp->_IO_write_base; | |
break; | |
default: /* case _IO_seek_set: */ | |
break; | |
} | |
if (offset < 0) | |
return EOF; | |
if ((_IO_ssize_t) offset > cur_size | |
&& enlarge_userbuf (fp, offset, 0) != 0) | |
return EOF; | |
fp->_IO_write_ptr = fp->_IO_write_base + offset; | |
new_pos = offset; | |
} | |
} | |
return new_pos; | |
} | |
libc_hidden_def (_IO_str_seekoff) | |
int | |
_IO_str_pbackfail (_IO_FILE *fp, int c) | |
{ | |
if ((fp->_flags & _IO_NO_WRITES) && c != EOF) | |
return EOF; | |
return _IO_default_pbackfail (fp, c); | |
} | |
libc_hidden_def (_IO_str_pbackfail) | |
void | |
_IO_str_finish (_IO_FILE *fp, int dummy) | |
{ | |
if (fp->_IO_buf_base && !(fp->_flags & _IO_USER_BUF)) | |
(((_IO_strfile *) fp)->_s._free_buffer) (fp->_IO_buf_base); | |
fp->_IO_buf_base = NULL; | |
_IO_default_finish (fp, 0); | |
} | |
const struct _IO_jump_t _IO_str_jumps = | |
{ | |
JUMP_INIT_DUMMY, | |
JUMP_INIT(finish, _IO_str_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_default_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) | |
}; |