[COMMIT] Prefer byte_beginning_of_line_p() throughout the C code.

APPROVE COMMIT NOTE: This patch has been committed # HG changeset patch # User Aidan Kehoe <kehoea(a)parhasard.net&gt; # Date 1550501614 0 # Mon Feb 18 14:53:34 2019 +0000 # Node ID cc27eb6f808b9fe3055bd866e521f2646b2556b2 # Parent f1c4035664d73d7e5d0332811a402981461b87c2 Prefer byte_beginning_of_line_p() throughout the C code. 2019-02-18 Aidan Kehoe <kehoea(a)parhasard.net&gt; Prefer byte_beginning_of_line_p() throughout the C code. * buffer.h: Make byte_beginning_of_line_p() inline, given its short length and its use in redisplay. Move it to this file from editfns.c given it needs access to buffer internals. * editfns.c (beginning_of_line_p): Remove this entirely. * lisp.h: Remove its declaration from lisp.h. * redisplay.c (create_text_block): Correct some BUF_FETCH_CHAR vs. BYTE_BUF_FETCH_CHAR confusion. * redisplay.c (redisplay_window): Call byte_beginning_of_line_p() in this function. * window.c (Fset_window_start): Leave the POSITION munging to set_marker_restricted(), something it's better at, anyway. Call byte_beginning_of_line_p() here. * window.c (Fdelete_other_windows): * window.c (Fset_window_buffer): * window.c (window_scroll): * window.c (Fcenter_to_window_line): * window.c (Fmove_to_window_line): Call byte_beginning_of_line_p() in these other functions too. diff -r f1c4035664d7 -r cc27eb6f808b src/ChangeLog --- a/src/ChangeLog Mon Feb 18 13:08:54 2019 +0000 +++ b/src/ChangeLog Mon Feb 18 14:53:34 2019 +0000 ＠＠ -1,3 +1,28 ＠＠ +2019-02-18 Aidan Kehoe <kehoea(a)parhasard.net&gt; + + Prefer byte_beginning_of_line_p() throughout the C code. + * buffer.h: + Make byte_beginning_of_line_p() inline, given its short length and + its use in redisplay. + Move it to this file from editfns.c given it needs access to + buffer internals. + * editfns.c (beginning_of_line_p): Remove this entirely. + * lisp.h: Remove its declaration from lisp.h. + * redisplay.c (create_text_block): + Correct some BUF_FETCH_CHAR vs. BYTE_BUF_FETCH_CHAR confusion. + * redisplay.c (redisplay_window): + Call byte_beginning_of_line_p() in this function. + * window.c (Fset_window_start): + Leave the POSITION munging to set_marker_restricted(), something + it's better at, anyway. + Call byte_beginning_of_line_p() here. + * window.c (Fdelete_other_windows): + * window.c (Fset_window_buffer): + * window.c (window_scroll): + * window.c (Fcenter_to_window_line): + * window.c (Fmove_to_window_line): + Call byte_beginning_of_line_p() in these other functions too. + 2019-02-18 Aidan Kehoe <kehoea(a)parhasard.net&gt; * menubar-x.c (menu_item_descriptor_to_widget_value_1): diff -r f1c4035664d7 -r cc27eb6f808b src/buffer.h --- a/src/buffer.h Mon Feb 18 13:08:54 2019 +0000 +++ b/src/buffer.h Mon Feb 18 14:53:34 2019 +0000 ＠＠ -1312,4 +1312,21 ＠＠ #endif /* !REL_ALLOC */ +/* This gets to go here because it's used enough in redisplay that it's worth + making it inline, and because lisp.h doesn't have access to the + buffer.h-internal macros. */ +DECLARE_INLINE_HEADER ( +Boolint +byte_beginning_of_line_p (struct buffer *b, Bytebpos bpt) +) +{ + if (bpt <= BYTE_BUF_BEGV (b)) + { + return 1; + } + + DEC_BYTEBPOS (b, bpt); + return BYTE_BUF_FETCH_CHAR (b, bpt) == '\n'; +} + #endif /* INCLUDED_buffer_h_ */ diff -r f1c4035664d7 -r cc27eb6f808b src/editfns.c --- a/src/editfns.c Mon Feb 18 13:08:54 2019 +0000 +++ b/src/editfns.c Mon Feb 18 14:53:34 2019 +0000 ＠＠ -515,26 +515,6 ＠＠ return BYTE_BUF_PT (b) == BYTE_BUF_ZV (b) ? Qt : Qnil; } -static Boolint -byte_beginning_of_line_p (struct buffer *b, Bytebpos bpt) -{ - if (bpt <= BYTE_BUF_BEGV (b)) - { - return 1; - } - - DEC_BYTEBPOS (b, bpt); - return BYTE_BUF_FETCH_CHAR (b, bpt) == '\n'; -} - -/* #### Rework redisplay.c and the window code to use - byte_beginning_of_line_p() instead of this! */ -Boolint -beginning_of_line_p (struct buffer *b, Charbpos pt) -{ - return pt <= BUF_BEGV (b) || BUF_FETCH_CHAR (b, pt - 1) == '\n'; -} - DEFUN ("bolp", Fbolp, 0, 1, 0, /* Return t if point is at the beginning of a line. If BUFFER is nil, the current buffer is assumed. diff -r f1c4035664d7 -r cc27eb6f808b src/lisp.h --- a/src/lisp.h Mon Feb 18 13:08:54 2019 +0000 +++ b/src/lisp.h Mon Feb 18 14:53:34 2019 +0000 ＠＠ -4835,7 +4835,6 ＠＠ Lisp_Object save_excursion_restore (Lisp_Object); Lisp_Object save_restriction_restore (Lisp_Object); void widen_buffer (struct buffer *b, int no_clip); -Boolint beginning_of_line_p (struct buffer *, Charbpos); Lisp_Object save_current_buffer_restore (Lisp_Object); extern Lisp_Object Qformat; diff -r f1c4035664d7 -r cc27eb6f808b src/redisplay.c --- a/src/redisplay.c Mon Feb 18 13:08:54 2019 +0000 +++ b/src/redisplay.c Mon Feb 18 14:53:34 2019 +0000 ＠＠ -2314,7 +2314,8 ＠＠ supposed to display. */ if (selective > 0 && (data.byte_charpos == BYTE_BUF_BEGV (b) - || BUF_FETCH_CHAR (b, prev_bytebpos (b, data.byte_charpos)) == '\n')) + || BYTE_BUF_FETCH_CHAR (b, prev_bytebpos (b, data.byte_charpos)) + == '\n')) { while (byte_spaces_at_point (b, data.byte_charpos) >= selective) { ＠＠ -6498,7 +6499,9 ＠＠ && !f->frame_changed && !truncation_changed /* check whether start is really at the beginning of a line GE */ - && (!w->start_at_line_beg || beginning_of_line_p (b, startp)) + && (!w->start_at_line_beg || + byte_beginning_of_line_p (b, byte_marker_position + (w->start[DESIRED_DISP]))) ) { /* Check if the cursor has actually moved. */ ＠＠ -6574,11 +6577,12 ＠＠ if our start position is equal to point-max. Otherwise we'll end up with a blank window. */ else if (((w->start_at_line_beg || MINI_WINDOW_P (w)) - && !(startp == BUF_BEGV (b) - || BUF_FETCH_CHAR (b, startp - 1) == '\n')) + && !(byte_beginning_of_line_p + (b, byte_marker_position (w->start[DESIRED_DISP])))) || (pointm == startp && EQ (Fmarker_buffer (w->last_start[CURRENT_DISP]), w->buffer) && - startp < marker_position (w->last_start[CURRENT_DISP])) + byte_marker_position (w->start[DESIRED_DISP]) + < byte_marker_position (w->last_start[CURRENT_DISP])) || (startp == BUF_ZV (b))) { startp = regenerate_window_point_center (w, pointm, DESIRED_DISP); diff -r f1c4035664d7 -r cc27eb6f808b src/window.c --- a/src/window.c Mon Feb 18 13:08:54 2019 +0000 +++ b/src/window.c Mon Feb 18 14:53:34 2019 +0000 ＠＠ -1994,13 +1994,13 ＠＠ { struct window *w = decode_window (window); - CHECK_FIXNUM_COERCE_MARKER (pos); set_marker_restricted (w->start[CURRENT_DISP], pos, w->buffer); /* this is not right, but much easier than doing what is right. */ /* w->start_at_line_beg = 0; */ /* WTF is the above supposed to mean? GE */ - w->start_at_line_beg = beginning_of_line_p (XBUFFER (w->buffer), - marker_position (w->start[CURRENT_DISP])); + w->start_at_line_beg + = byte_beginning_of_line_p (XBUFFER (w->buffer), + byte_marker_position (w->start[CURRENT_DISP])); if (NILP (noforce)) w->force_start = 1; w->redo_modeline = 1; ＠＠ -3324,7 +3324,9 ＠＠ { Fset_marker (w->start[CURRENT_DISP], make_fixnum (new_start), w->buffer); - w->start_at_line_beg = beginning_of_line_p (b, new_start); + w->start_at_line_beg + = byte_beginning_of_line_p + (b, byte_marker_position (w->start[CURRENT_DISP])); } /* We need to do this, so that the window-scroll-functions get called. */ ＠＠ -3796,8 +3798,8 ＠＠ Fset_marker (w->sb_point, w->start[CURRENT_DISP], buffer); /* set start_at_line_beg correctly. GE */ w->start_at_line_beg = - beginning_of_line_p (XBUFFER (buffer), - marker_position (w->start[CURRENT_DISP])); + byte_beginning_of_line_p (XBUFFER (buffer), + byte_marker_position (w->start[CURRENT_DISP])); w->force_start = 0; /* XEmacs fix */ SET_LAST_MODIFIED (w, 1); SET_LAST_FACECHANGE (w); ＠＠ -4636,7 +4638,9 ＠＠ Fvertical_motion (make_fixnum (-window_char_height (w, 0) / 2), window, Qnil); Fset_marker (w->start[CURRENT_DISP], point, w->buffer); - w->start_at_line_beg = beginning_of_line_p (b, XFIXNUM (point)); + w->start_at_line_beg + = byte_beginning_of_line_p + (b, byte_marker_position (w->start[CURRENT_DISP])); WINDOW_TEXT_TOP_CLIP (w) = 0; MARK_WINDOWS_CHANGED (w); } ＠＠ -4732,10 +4736,13 ＠＠ } else { - set_marker_restricted (w->start[CURRENT_DISP], make_fixnum (startp), + set_marker_restricted (w->start[CURRENT_DISP], + make_fixnum (startp), w->buffer); w->force_start = 1; - w->start_at_line_beg = beginning_of_line_p (b, startp); + w->start_at_line_beg + = byte_beginning_of_line_p + (b, byte_marker_position (w->start[CURRENT_DISP])); MARK_WINDOWS_CHANGED (w); if (!point_would_be_visible (w, startp, XFIXNUM (point), 0)) ＠＠ -4785,7 +4792,9 ＠＠ set_marker_restricted (w->start[CURRENT_DISP], make_fixnum (startp), w->buffer); w->force_start = 1; - w->start_at_line_beg = beginning_of_line_p (b, startp); + w->start_at_line_beg + = byte_beginning_of_line_p + (b, byte_marker_position (w->start[CURRENT_DISP])); MARK_WINDOWS_CHANGED (w); /* #### Scroll back by less than a line. This code was ＠＠ -4848,7 +4857,9 ＠＠ set_marker_restricted (w->start[CURRENT_DISP], make_fixnum (startp), w->buffer); w->force_start = 1; - w->start_at_line_beg = beginning_of_line_p (b, startp); + w->start_at_line_beg + = byte_beginning_of_line_p + (b, byte_marker_position (w->start[CURRENT_DISP])); MARK_WINDOWS_CHANGED (w); if (!point_would_be_visible (w, startp, XFIXNUM (point), 0)) ＠＠ -5026,7 +5037,9 ＠＠ Fset_marker (w->start[CURRENT_DISP], make_fixnum (startp), w->buffer); - w->start_at_line_beg = beginning_of_line_p (b, startp); + w->start_at_line_beg + = byte_beginning_of_line_p (b, + byte_marker_position (w->start[CURRENT_DISP])); w->force_start = 1; MARK_WINDOWS_CHANGED (w); return Qnil; ＠＠ -5128,7 +5141,9 ＠＠ Fset_marker (w->start[CURRENT_DISP], make_fixnum (new_point), w->buffer); - w->start_at_line_beg = beginning_of_line_p (b, new_point); + w->start_at_line_beg + = byte_beginning_of_line_p + (b, byte_marker_position (w->start[CURRENT_DISP])); w->force_start = 1; } else -- ‘As I sat looking up at the Guinness ad, I could never figure out / How your man stayed up on the surfboard after forty pints of stout’ (C. Moore)