diff options
Diffstat (limited to 'libio/wstrops.c')
| -rw-r--r-- | libio/wstrops.c | 330 |
1 files changed, 330 insertions, 0 deletions
diff --git a/libio/wstrops.c b/libio/wstrops.c new file mode 100644 index 0000000..af2c957 --- /dev/null +++ b/libio/wstrops.c @@ -0,0 +1,330 @@ +/* Copyright (C) 1993, 1997, 1998, 1999 Free Software Foundation, Inc. + This file is part of the GNU IO Library. + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 2, or (at + your option) any later version. + + This 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 + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this library; see the file COPYING. If not, write to + the Free Software Foundation, 59 Temple Place - Suite 330, Boston, + MA 02111-1307, USA. + + As a special exception, if you link this library with files + compiled with a GNU compiler to produce an executable, this does + not cause the resulting executable to be covered by the GNU General + Public License. This exception does not however invalidate any + other reasons why the executable file might be covered by the GNU + General Public License. */ + +#include "strfile.h" +#include "libioP.h" +#include <string.h> +#include <wchar.h> + +#if 0 +/* The following definitions are for exposition only. + They map the terminology used in the ANSI/ISO C++ draft standard + to the implementation. */ + +/* allocated: set when a dynamic array object has been allocated, and + hence should be freed by the destructor for the strstreambuf object. */ +#define ALLOCATED(FP) ((FP)->_f._IO_buf_base && DYNAMIC(FP)) + +/* constant: set when the array object has const elements, + so the output sequence cannot be written. */ +#define CONSTANT(FP) ((FP)->_f._IO_file_flags & _IO_NO_WRITES) + +/* alsize: the suggested minimum size for a dynamic array object. */ +#define ALSIZE(FP) ??? /* not stored */ + +/* palloc: points to the function to call to allocate a dynamic array object.*/ +#define PALLOC(FP) \ + ((FP)->_s._allocate_buffer == default_alloc ? 0 : (FP)->_s._allocate_buffer) + +/* pfree: points to the function to call to free a dynamic array object. */ +#define PFREE(FP) \ + ((FP)->_s._free_buffer == default_free ? 0 : (FP)->_s._free_buffer) + +#endif + +#ifdef TODO +/* An "unbounded buffer" is when a buffer is supplied, but with no + specified length. An example is the buffer argument to sprintf. + */ +#endif + +void +_IO_wstr_init_static (fp, ptr, size, pstart) + _IO_FILE *fp; + wchar_t *ptr; + int size; + wchar_t *pstart; +{ + if (size == 0) + size = __wcslen (ptr); + else if (size < 0) + { + /* If size is negative 'the characters are assumed to + continue indefinitely.' This is kind of messy ... */ + int s; + size = 512; + /* Try increasing powers of 2, as long as we don't wrap around. */ + for (; s = 2*size, s > 0 && ptr + s > ptr && s < 0x4000000L; ) + size = s; + /* Try increasing size as much as we can without wrapping around. */ + for (s = size >> 1; s > 0; s >>= 1) + { + if (ptr + size + s > ptr) + size += s; + } + } + _IO_wsetb (fp, ptr, ptr + size, 0); + + fp->_wide_data->_IO_write_base = ptr; + fp->_wide_data->_IO_read_base = ptr; + fp->_wide_data->_IO_read_ptr = ptr; + if (pstart) + { + fp->_wide_data->_IO_write_ptr = pstart; + fp->_wide_data->_IO_write_end = ptr + size; + fp->_wide_data->_IO_read_end = pstart; + } + else + { + fp->_wide_data->_IO_write_ptr = ptr; + fp->_wide_data->_IO_write_end = ptr; + fp->_wide_data->_IO_read_end = ptr + size; + } + /* A null _allocate_buffer function flags the strfile as being static. */ + (((_IO_strfile *) fp)->_s._allocate_buffer) = (_IO_alloc_type)0; +} + +void +_IO_wstr_init_readonly (fp, ptr, size) + _IO_FILE *fp; + const char *ptr; + int size; +{ + _IO_wstr_init_static (fp, (wchar_t *) ptr, size, NULL); + fp->_IO_file_flags |= _IO_NO_WRITES; +} + +_IO_wint_t +_IO_wstr_overflow (fp, c) + _IO_FILE *fp; + _IO_wint_t c; +{ + int flush_only = c == WEOF; + _IO_size_t pos; + if (fp->_flags & _IO_NO_WRITES) + return flush_only ? 0 : WEOF; + if ((fp->_flags & _IO_TIED_PUT_GET) && !(fp->_flags & _IO_CURRENTLY_PUTTING)) + { + fp->_flags |= _IO_CURRENTLY_PUTTING; + fp->_wide_data->_IO_write_ptr = fp->_wide_data->_IO_read_ptr; + fp->_wide_data->_IO_read_ptr = fp->_wide_data->_IO_read_end; + } + pos = fp->_wide_data->_IO_write_ptr - fp->_wide_data->_IO_write_base; + if (pos >= (_IO_size_t) (_IO_wblen (fp) + flush_only)) + { + if (fp->_flags & _IO_USER_BUF) /* not allowed to enlarge */ + return WEOF; + else + { + wchar_t *new_buf; + wchar_t *old_buf = fp->_wide_data->_IO_buf_base; + _IO_size_t new_size = 2 * _IO_wblen (fp) + 100; + new_buf + = (wchar_t *) (*((_IO_strfile *) fp)->_s._allocate_buffer) (new_size + * sizeof (wchar_t)); + if (new_buf == NULL) + { + /* __ferror(fp) = 1; */ + return WEOF; + } + if (old_buf) + { + __wmemcpy (new_buf, old_buf, _IO_wblen (fp)); + (*((_IO_strfile *) fp)->_s._free_buffer) (old_buf); + /* Make sure _IO_setb won't try to delete _IO_buf_base. */ + fp->_wide_data->_IO_buf_base = NULL; + } + _IO_wsetb (fp, new_buf, new_buf + new_size, 1); + fp->_wide_data->_IO_read_base = + new_buf + (fp->_wide_data->_IO_read_base - old_buf); + fp->_wide_data->_IO_read_ptr = + new_buf + (fp->_wide_data->_IO_read_ptr - old_buf); + fp->_wide_data->_IO_read_end = + new_buf + (fp->_wide_data->_IO_read_end - old_buf); + fp->_wide_data->_IO_write_ptr = + new_buf + (fp->_wide_data->_IO_write_ptr - old_buf); + + fp->_wide_data->_IO_write_base = new_buf; + fp->_wide_data->_IO_write_end = fp->_wide_data->_IO_buf_end; + } + } + + if (!flush_only) + *fp->_wide_data->_IO_write_ptr++ = c; + if (fp->_wide_data->_IO_write_ptr > fp->_wide_data->_IO_read_end) + fp->_wide_data->_IO_read_end = fp->_wide_data->_IO_write_ptr; + return c; +} + +_IO_wint_t +_IO_wstr_underflow (fp) + _IO_FILE *fp; +{ + if (fp->_wide_data->_IO_write_ptr > fp->_wide_data->_IO_read_end) + fp->_wide_data->_IO_read_end = fp->_wide_data->_IO_write_ptr; + if ((fp->_flags & _IO_TIED_PUT_GET) && (fp->_flags & _IO_CURRENTLY_PUTTING)) + { + fp->_flags &= ~_IO_CURRENTLY_PUTTING; + fp->_wide_data->_IO_read_ptr = fp->_wide_data->_IO_write_ptr; + fp->_wide_data->_IO_write_ptr = fp->_wide_data->_IO_write_end; + } + if (fp->_wide_data->_IO_read_ptr < fp->_wide_data->_IO_read_end) + return *fp->_wide_data->_IO_read_ptr; + else + return WEOF; +} + +/* The size of the valid part of the buffer. */ + +_IO_ssize_t +_IO_wstr_count (fp) + _IO_FILE *fp; +{ + return ((fp->_wide_data->_IO_write_ptr > fp->_wide_data->_IO_read_end + ? fp->_wide_data->_IO_write_ptr : fp->_wide_data->_IO_read_end) + - fp->_wide_data->_IO_read_base); +} + +_IO_off64_t +_IO_wstr_seekoff (fp, offset, dir, mode) + _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->_wide_data->_IO_read_ptr - fp->_wide_data->_IO_read_base; + else + new_pos = (fp->_wide_data->_IO_write_ptr + - fp->_wide_data->_IO_write_base); + } + else + { + _IO_ssize_t cur_size = _IO_wstr_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->_wide_data->_IO_read_ptr + - fp->_wide_data->_IO_read_base); + break; + default: /* case _IO_seek_set: */ + break; + } + if (offset < 0 || (_IO_ssize_t) offset > cur_size) + return EOF; + fp->_wide_data->_IO_read_ptr = (fp->_wide_data->_IO_read_base + + offset); + fp->_wide_data->_IO_read_end = (fp->_wide_data->_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->_wide_data->_IO_write_ptr + - fp->_wide_data->_IO_write_base); + break; + default: /* case _IO_seek_set: */ + break; + } + if (offset < 0 || (_IO_ssize_t) offset > cur_size) + return EOF; + fp->_wide_data->_IO_write_ptr = (fp->_wide_data->_IO_write_base + + offset); + new_pos = offset; + } + } + return new_pos; +} + +_IO_wint_t +_IO_wstr_pbackfail (fp, c) + _IO_FILE *fp; + _IO_wint_t c; +{ + if ((fp->_flags & _IO_NO_WRITES) && c != EOF) + return WEOF; + return _IO_wdefault_pbackfail (fp, c); +} + +void +_IO_wstr_finish (fp, dummy) + _IO_FILE *fp; + int dummy; +{ + if (fp->_wide_data->_IO_buf_base && !(fp->_flags & _IO_USER_BUF)) + (((_IO_strfile *) fp)->_s._free_buffer) (fp->_wide_data->_IO_buf_base); + fp->_wide_data->_IO_buf_base = NULL; + + _IO_wdefault_finish (fp, 0); +} + +struct _IO_jump_t _IO_wstr_jumps = +{ + JUMP_INIT_DUMMY, + JUMP_INIT(finish, _IO_wstr_finish), + JUMP_INIT(overflow, (_IO_overflow_t) _IO_wstr_overflow), + JUMP_INIT(underflow, (_IO_underflow_t) _IO_wstr_underflow), + JUMP_INIT(uflow, (_IO_underflow_t) _IO_wdefault_uflow), + JUMP_INIT(pbackfail, (_IO_pbackfail_t) _IO_wstr_pbackfail), + JUMP_INIT(xsputn, _IO_wdefault_xsputn), + JUMP_INIT(xsgetn, _IO_wdefault_xsgetn), + JUMP_INIT(seekoff, _IO_wstr_seekoff), + JUMP_INIT(seekpos, _IO_default_seekpos), + JUMP_INIT(setbuf, (_IO_setbuf_t) _IO_wdefault_setbuf), + JUMP_INIT(sync, _IO_default_sync), + JUMP_INIT(doallocate, _IO_wdefault_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) +}; |