/* Copyright (C) 1993-2018 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 . 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 #include "strfile.h" #include "libioP.h" #include #include #include void _IO_wstr_init_static (_IO_FILE *fp, wchar_t *ptr, _IO_size_t size, wchar_t *pstart) { wchar_t *end; if (size == 0) end = ptr + __wcslen (ptr); else if ((_IO_size_t) ptr + size * sizeof (wchar_t) > (_IO_size_t) ptr) end = ptr + size; else /* Even for misaligned ptr make sure there is integral number of wide characters. */ end = ptr + (-1 - (_IO_size_t) ptr) / sizeof (wchar_t); _IO_wsetb (fp, ptr, end, 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 = end; 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 = end; } /* A null _allocate_buffer function flags the strfile as being static. */ (((_IO_strfile *) fp)->_s._allocate_buffer_unused) = (_IO_alloc_type)0; } _IO_wint_t _IO_wstr_overflow (_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->_flags2 & _IO_FLAGS2_USER_WBUF) /* not allowed to enlarge */ return WEOF; else { wchar_t *new_buf; wchar_t *old_buf = fp->_wide_data->_IO_buf_base; size_t old_wblen = _IO_wblen (fp); _IO_size_t new_size = 2 * old_wblen + 100; if (__glibc_unlikely (new_size < old_wblen) || __glibc_unlikely (new_size > SIZE_MAX / sizeof (wchar_t))) return EOF; new_buf = malloc (new_size * sizeof (wchar_t)); if (new_buf == NULL) { /* __ferror(fp) = 1; */ return WEOF; } if (old_buf) { __wmemcpy (new_buf, old_buf, old_wblen); free (old_buf); /* Make sure _IO_setb won't try to delete _IO_buf_base. */ fp->_wide_data->_IO_buf_base = NULL; } __wmemset (new_buf + old_wblen, L'\0', new_size - old_wblen); _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 (_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 (_IO_FILE *fp) { struct _IO_wide_data *wd = fp->_wide_data; return ((wd->_IO_write_ptr > wd->_IO_read_end ? wd->_IO_write_ptr : wd->_IO_read_end) - wd->_IO_read_base); } static int enlarge_userbuf (_IO_FILE *fp, _IO_off64_t offset, int reading) { if ((_IO_ssize_t) offset <= _IO_wblen (fp)) return 0; struct _IO_wide_data *wd = fp->_wide_data; _IO_ssize_t oldend = wd->_IO_write_end - wd->_IO_write_base; /* Try to enlarge the buffer. */ if (fp->_flags2 & _IO_FLAGS2_USER_WBUF) /* User-provided buffer. */ return 1; _IO_size_t newsize = offset + 100; if (__glibc_unlikely (newsize > SIZE_MAX / sizeof (wchar_t))) return 1; wchar_t *oldbuf = wd->_IO_buf_base; wchar_t *newbuf = malloc (newsize * sizeof (wchar_t)); if (newbuf == NULL) return 1; if (oldbuf != NULL) { __wmemcpy (newbuf, oldbuf, _IO_wblen (fp)); free (oldbuf); /* Make sure _IO_setb won't try to delete _IO_buf_base. */ wd->_IO_buf_base = NULL; } _IO_wsetb (fp, newbuf, newbuf + newsize, 1); if (reading) { wd->_IO_write_base = newbuf + (wd->_IO_write_base - oldbuf); wd->_IO_write_ptr = newbuf + (wd->_IO_write_ptr - oldbuf); wd->_IO_write_end = newbuf + (wd->_IO_write_end - oldbuf); wd->_IO_read_ptr = newbuf + (wd->_IO_read_ptr - oldbuf); wd->_IO_read_base = newbuf; wd->_IO_read_end = wd->_IO_buf_end; } else { wd->_IO_read_base = newbuf + (wd->_IO_read_base - oldbuf); wd->_IO_read_ptr = newbuf + (wd->_IO_read_ptr - oldbuf); wd->_IO_read_end = newbuf + (wd->_IO_read_end - oldbuf); wd->_IO_write_ptr = newbuf + (wd->_IO_write_ptr - oldbuf); wd->_IO_write_base = newbuf; wd->_IO_write_end = wd->_IO_buf_end; } /* Clear the area between the last write position and th new position. */ assert (offset >= oldend); if (reading) __wmemset (wd->_IO_read_base + oldend, L'\0', offset - oldend); else __wmemset (wd->_IO_write_base + oldend, L'\0', offset - oldend); return 0; } static void _IO_wstr_switch_to_get_mode (_IO_FILE *fp) { if (_IO_in_backup (fp)) fp->_wide_data->_IO_read_base = fp->_wide_data->_IO_backup_base; else { fp->_wide_data->_IO_read_base = fp->_wide_data->_IO_buf_base; 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; } fp->_wide_data->_IO_read_ptr = fp->_wide_data->_IO_write_ptr; fp->_wide_data->_IO_read_end = fp->_wide_data->_IO_write_ptr; fp->_flags &= ~_IO_CURRENTLY_PUTTING; } _IO_off64_t _IO_wstr_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); bool was_writing = (fp->_wide_data->_IO_write_ptr > fp->_wide_data->_IO_write_base || _IO_in_put_mode (fp)); if (was_writing) _IO_wstr_switch_to_get_mode (fp); if (mode == 0) { 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) { _IO_ssize_t base; switch (dir) { case _IO_seek_set: base = 0; break; case _IO_seek_cur: base = (fp->_wide_data->_IO_read_ptr - fp->_wide_data->_IO_read_base); break; default: /* case _IO_seek_end: */ base = cur_size; break; } _IO_ssize_t maxval = SSIZE_MAX/sizeof (wchar_t) - base; if (offset < -base || offset > maxval) { __set_errno (EINVAL); return EOF; } base += offset; if (base > cur_size && enlarge_userbuf (fp, base, 1) != 0) return EOF; fp->_wide_data->_IO_read_ptr = (fp->_wide_data->_IO_read_base + base); 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) { _IO_ssize_t base; switch (dir) { case _IO_seek_set: base = 0; break; case _IO_seek_cur: base = (fp->_wide_data->_IO_write_ptr - fp->_wide_data->_IO_write_base); break; default: /* case _IO_seek_end: */ base = cur_size; break; } _IO_ssize_t maxval = SSIZE_MAX/sizeof (wchar_t) - base; if (offset < -base || offset > maxval) { __set_errno (EINVAL); return EOF; } base += offset; if (base > cur_size && enlarge_userbuf (fp, base, 0) != 0) return EOF; fp->_wide_data->_IO_write_ptr = (fp->_wide_data->_IO_write_base + base); new_pos = base; } } return new_pos; } _IO_wint_t _IO_wstr_pbackfail (_IO_FILE *fp, _IO_wint_t c) { if ((fp->_flags & _IO_NO_WRITES) && c != WEOF) return WEOF; return _IO_wdefault_pbackfail (fp, c); } void _IO_wstr_finish (_IO_FILE *fp, int dummy) { if (fp->_wide_data->_IO_buf_base && !(fp->_flags2 & _IO_FLAGS2_USER_WBUF)) free (fp->_wide_data->_IO_buf_base); fp->_wide_data->_IO_buf_base = NULL; _IO_wdefault_finish (fp, 0); } const struct _IO_jump_t _IO_wstr_jumps libio_vtable = { 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_default_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) };