wint_t __wunderflow (FILE *fp) { if (fp->_mode < 0 || (fp->_mode == 0 && _IO_fwide (fp, 1) != 1)) return WEOF; if (fp->_mode == 0) _IO_fwide (fp, 1); if (_IO_in_put_mode (fp)) if (_IO_switch_to_wget_mode (fp) == EOF) return WEOF; if (fp->_wide_data->_IO_read_ptr < fp->_wide_data->_IO_read_end) return *fp->_wide_data->_IO_read_ptr; if (_IO_in_backup (fp)) { _IO_switch_to_main_wget_area (fp); if (fp->_wide_data->_IO_read_ptr < fp->_wide_data->_IO_read_end) return *fp->_wide_data->_IO_read_ptr; } if (_IO_have_markers (fp)) { if (save_for_wbackup (fp, fp->_wide_data->_IO_read_end)) return WEOF; } else if (_IO_have_backup (fp)) _IO_free_wbackup_area (fp); return _IO_UNDERFLOW (fp); }
void _IO_unsave_wmarkers (FILE *fp) { struct _IO_marker *mark = fp->_markers; if (mark) { fp->_markers = 0; } if (_IO_have_backup (fp)) _IO_free_wbackup_area (fp); }
_IO_off64_t _IO_seekpos_unlocked (_IO_FILE *fp, _IO_off64_t pos, int mode) { /* If we have a backup buffer, get rid of it, since the __seekoff callback may not know to do the right thing about it. This may be over-kill, but it'll do for now. TODO */ if (_IO_fwide (fp, 0) <= 0) { if (_IO_have_backup (fp)) _IO_free_backup_area (fp); } else { if (_IO_have_wbackup (fp)) _IO_free_wbackup_area (fp); } return _IO_SEEKOFF (fp, pos, 0, mode); }
int _IO_new_file_close_it (_IO_FILE *fp) { int write_status; if (!_IO_file_is_open (fp)) return EOF; if ((fp->_flags & _IO_NO_WRITES) == 0 && (fp->_flags & _IO_CURRENTLY_PUTTING) != 0) write_status = _IO_do_flush (fp); else write_status = 0; _IO_unsave_markers (fp); int close_status = ((fp->_flags2 & _IO_FLAGS2_NOCLOSE) == 0 ? _IO_SYSCLOSE (fp) : 0); /* Free buffer. */ #if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T if (fp->_mode > 0) { if (_IO_have_wbackup (fp)) _IO_free_wbackup_area (fp); _IO_wsetb (fp, NULL, NULL, 0); _IO_wsetg (fp, NULL, NULL, NULL); _IO_wsetp (fp, NULL, NULL); } #endif _IO_setb (fp, NULL, NULL, 0); _IO_setg (fp, NULL, NULL, NULL); _IO_setp (fp, NULL, NULL); _IO_un_link ((struct _IO_FILE_plus *) fp); fp->_flags = _IO_MAGIC|CLOSED_FILEBUF_FLAGS; fp->_fileno = -1; fp->_offset = _IO_pos_BAD; return close_status ? close_status : write_status; }
void __fpurge (FILE *fp) { if (fp->_mode > 0) { /* Wide-char stream. */ if (_IO_in_backup (fp)) _IO_free_wbackup_area (fp); fp->_wide_data->_IO_read_end = fp->_wide_data->_IO_read_ptr; fp->_wide_data->_IO_write_ptr = fp->_wide_data->_IO_write_base; } else { /* Byte stream. */ if (_IO_in_backup (fp)) _IO_free_backup_area (fp); fp->_IO_read_end = fp->_IO_read_ptr; fp->_IO_write_ptr = fp->_IO_write_base; } }
off64_t _IO_wfile_seekoff (FILE *fp, off64_t offset, int dir, int mode) { off64_t result; off64_t delta, new_offset; long int count; /* Short-circuit into a separate function. We don't want to mix any functionality and we don't want to touch anything inside the FILE object. */ if (mode == 0) return do_ftell_wide (fp); /* POSIX.1 8.2.3.7 says that after a call the fflush() the file offset of the underlying file must be exact. */ int must_be_exact = ((fp->_wide_data->_IO_read_base == fp->_wide_data->_IO_read_end) && (fp->_wide_data->_IO_write_base == fp->_wide_data->_IO_write_ptr)); bool was_writing = ((fp->_wide_data->_IO_write_ptr > fp->_wide_data->_IO_write_base) || _IO_in_put_mode (fp)); /* Flush unwritten characters. (This may do an unneeded write if we seek within the buffer. But to be able to switch to reading, we would need to set egptr to pptr. That can't be done in the current design, which assumes file_ptr() is eGptr. Anyway, since we probably end up flushing when we close(), it doesn't make much difference.) FIXME: simulate mem-mapped files. */ if (was_writing && _IO_switch_to_wget_mode (fp)) return WEOF; if (fp->_wide_data->_IO_buf_base == NULL) { /* It could be that we already have a pushback buffer. */ if (fp->_wide_data->_IO_read_base != NULL) { free (fp->_wide_data->_IO_read_base); fp->_flags &= ~_IO_IN_BACKUP; } _IO_doallocbuf (fp); _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base); _IO_wsetp (fp, fp->_wide_data->_IO_buf_base, fp->_wide_data->_IO_buf_base); _IO_wsetg (fp, fp->_wide_data->_IO_buf_base, fp->_wide_data->_IO_buf_base, fp->_wide_data->_IO_buf_base); } switch (dir) { struct _IO_codecvt *cv; int clen; case _IO_seek_cur: /* Adjust for read-ahead (bytes is buffer). To do this we must find out which position in the external buffer corresponds to the current position in the internal buffer. */ cv = fp->_codecvt; clen = (*cv->__codecvt_do_encoding) (cv); if (mode != 0 || !was_writing) { if (clen > 0) { offset -= (fp->_wide_data->_IO_read_end - fp->_wide_data->_IO_read_ptr) * clen; /* Adjust by readahead in external buffer. */ offset -= fp->_IO_read_end - fp->_IO_read_ptr; } else { int nread; delta = (fp->_wide_data->_IO_read_ptr - fp->_wide_data->_IO_read_base); fp->_wide_data->_IO_state = fp->_wide_data->_IO_last_state; nread = (*cv->__codecvt_do_length) (cv, &fp->_wide_data->_IO_state, fp->_IO_read_base, fp->_IO_read_end, delta); fp->_IO_read_ptr = fp->_IO_read_base + nread; fp->_wide_data->_IO_read_end = fp->_wide_data->_IO_read_ptr; offset -= fp->_IO_read_end - fp->_IO_read_base - nread; } } if (fp->_offset == _IO_pos_BAD) goto dumb; /* Make offset absolute, assuming current pointer is file_ptr(). */ offset += fp->_offset; dir = _IO_seek_set; break; case _IO_seek_set: break; case _IO_seek_end: { struct stat64 st; if (_IO_SYSSTAT (fp, &st) == 0 && S_ISREG (st.st_mode)) { offset += st.st_size; dir = _IO_seek_set; } else goto dumb; } } _IO_free_wbackup_area (fp); /* At this point, dir==_IO_seek_set. */ /* If destination is within current buffer, optimize: */ if (fp->_offset != _IO_pos_BAD && fp->_IO_read_base != NULL && !_IO_in_backup (fp)) { off64_t start_offset = (fp->_offset - (fp->_IO_read_end - fp->_IO_buf_base)); if (offset >= start_offset && offset < fp->_offset) { _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base + (offset - start_offset), fp->_IO_read_end); _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); _IO_wsetg (fp, fp->_wide_data->_IO_buf_base, fp->_wide_data->_IO_buf_base, fp->_wide_data->_IO_buf_base); _IO_wsetp (fp, fp->_wide_data->_IO_buf_base, fp->_wide_data->_IO_buf_base); if (adjust_wide_data (fp, false)) goto dumb; _IO_mask_flags (fp, 0, _IO_EOF_SEEN); goto resync; } } if (fp->_flags & _IO_NO_READS) goto dumb; /* Try to seek to a block boundary, to improve kernel page management. */ new_offset = offset & ~(fp->_IO_buf_end - fp->_IO_buf_base - 1); delta = offset - new_offset; if (delta > fp->_IO_buf_end - fp->_IO_buf_base) { new_offset = offset; delta = 0; } result = _IO_SYSSEEK (fp, new_offset, 0); if (result < 0) return EOF; if (delta == 0) count = 0; else { count = _IO_SYSREAD (fp, fp->_IO_buf_base, (must_be_exact ? delta : fp->_IO_buf_end - fp->_IO_buf_base)); if (count < delta) { /* We weren't allowed to read, but try to seek the remainder. */ offset = count == EOF ? delta : delta-count; dir = _IO_seek_cur; goto dumb; } } _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base + delta, fp->_IO_buf_base + count); _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); _IO_wsetg (fp, fp->_wide_data->_IO_buf_base, fp->_wide_data->_IO_buf_base, fp->_wide_data->_IO_buf_base); _IO_wsetp (fp, fp->_wide_data->_IO_buf_base, fp->_wide_data->_IO_buf_base); if (adjust_wide_data (fp, true)) goto dumb; fp->_offset = result + count; _IO_mask_flags (fp, 0, _IO_EOF_SEEN); return offset; dumb: _IO_unsave_markers (fp); result = _IO_SYSSEEK (fp, offset, dir); if (result != EOF) { _IO_mask_flags (fp, 0, _IO_EOF_SEEN); fp->_offset = result; _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base); _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); _IO_wsetg (fp, fp->_wide_data->_IO_buf_base, fp->_wide_data->_IO_buf_base, fp->_wide_data->_IO_buf_base); _IO_wsetp (fp, fp->_wide_data->_IO_buf_base, fp->_wide_data->_IO_buf_base); } return result; resync: /* We need to do it since it is possible that the file offset in the kernel may be changed behind our back. It may happen when we fopen a file and then do a fork. One process may access the file and the kernel file offset will be changed. */ if (fp->_offset >= 0) _IO_SYSSEEK (fp, fp->_offset, 0); return offset; }
wint_t _IO_wfile_overflow (FILE *f, wint_t wch) { if (f->_flags & _IO_NO_WRITES) /* SET ERROR */ { f->_flags |= _IO_ERR_SEEN; __set_errno (EBADF); return WEOF; } /* If currently reading or no buffer allocated. */ if ((f->_flags & _IO_CURRENTLY_PUTTING) == 0) { /* Allocate a buffer if needed. */ if (f->_wide_data->_IO_write_base == 0) { _IO_wdoallocbuf (f); _IO_free_wbackup_area (f); _IO_wsetg (f, f->_wide_data->_IO_buf_base, f->_wide_data->_IO_buf_base, f->_wide_data->_IO_buf_base); if (f->_IO_write_base == NULL) { _IO_doallocbuf (f); _IO_setg (f, f->_IO_buf_base, f->_IO_buf_base, f->_IO_buf_base); } } else { /* Otherwise must be currently reading. If _IO_read_ptr (and hence also _IO_read_end) is at the buffer end, logically slide the buffer forwards one block (by setting the read pointers to all point at the beginning of the block). This makes room for subsequent output. Otherwise, set the read pointers to _IO_read_end (leaving that alone, so it can continue to correspond to the external position). */ if (f->_wide_data->_IO_read_ptr == f->_wide_data->_IO_buf_end) { f->_IO_read_end = f->_IO_read_ptr = f->_IO_buf_base; f->_wide_data->_IO_read_end = f->_wide_data->_IO_read_ptr = f->_wide_data->_IO_buf_base; } } f->_wide_data->_IO_write_ptr = f->_wide_data->_IO_read_ptr; f->_wide_data->_IO_write_base = f->_wide_data->_IO_write_ptr; f->_wide_data->_IO_write_end = f->_wide_data->_IO_buf_end; f->_wide_data->_IO_read_base = f->_wide_data->_IO_read_ptr = f->_wide_data->_IO_read_end; f->_IO_write_ptr = f->_IO_read_ptr; f->_IO_write_base = f->_IO_write_ptr; f->_IO_write_end = f->_IO_buf_end; f->_IO_read_base = f->_IO_read_ptr = f->_IO_read_end; f->_flags |= _IO_CURRENTLY_PUTTING; if (f->_flags & (_IO_LINE_BUF | _IO_UNBUFFERED)) f->_wide_data->_IO_write_end = f->_wide_data->_IO_write_ptr; } if (wch == WEOF) return _IO_do_flush (f); if (f->_wide_data->_IO_write_ptr == f->_wide_data->_IO_buf_end) /* Buffer is really full */ if (_IO_do_flush (f) == EOF) return WEOF; *f->_wide_data->_IO_write_ptr++ = wch; if ((f->_flags & _IO_UNBUFFERED) || ((f->_flags & _IO_LINE_BUF) && wch == L'\n')) if (_IO_do_flush (f) == EOF) return WEOF; return wch; }