diff options
Diffstat (limited to 'usr.bin/vi/nvi/v_scroll.c')
| -rw-r--r-- | usr.bin/vi/nvi/v_scroll.c | 354 |
1 files changed, 354 insertions, 0 deletions
diff --git a/usr.bin/vi/nvi/v_scroll.c b/usr.bin/vi/nvi/v_scroll.c new file mode 100644 index 000000000000..f69ea0fb4e87 --- /dev/null +++ b/usr.bin/vi/nvi/v_scroll.c @@ -0,0 +1,354 @@ +/*- + * Copyright (c) 1992, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#ifndef lint +static char sccsid[] = "@(#)v_scroll.c 8.8 (Berkeley) 12/16/93"; +#endif /* not lint */ + +#include <sys/types.h> + +#include <errno.h> + +#include "vi.h" +#include "excmd.h" +#include "vcmd.h" + +/* + * The historic vi had a problem in that all movements were by physical + * lines, not by logical, or screen lines. Arguments can be made that this + * is the right thing to do. For example, single line movements, such as + * 'j' or 'k', should probably work on physical lines. Commands like "dj", + * or "j.", where '.' is a change command, make more sense for physical lines + * than they do for logical lines. + * + * These arguments, however, don't apply to scrolling commands like ^D and + * ^F -- if the window is fairly small, using physical lines can result in + * a half-page scroll repainting the entire screen, which is not what the + * user wanted. Second, if the line is larger than the screen, using physical + * lines can make it impossible to display parts of the line -- there aren't + * any commands that don't display the beginning of the line in historic vi, + * and if both the beginning and end of the line can't be on the screen at + * the same time, you lose. This is even worse in the case of the H, L, and + * M commands -- for large lines, they may all refer to the same line and + * will result in no movement at all. + * + * This implementation does the scrolling (^B, ^D, ^F, ^U, ^Y, ^E), and the + * cursor positioning commands (H, L, M) commands using logical lines, not + * physical. + * + * Another issue is that page and half-page scrolling commands historically + * moved to the first non-blank character in the new line. If the line is + * approximately the same size as the screen, this loses because the cursor + * before and after a ^D, may refer to the same location on the screen. In + * this implementation, scrolling commands set the cursor to the first non- + * blank character if the line changes because of the scroll. Otherwise, + * the cursor is left alone. + */ + +/* + * v_lgoto -- [count]G + * Go to first non-blank character of the line count, the last line + * of the file by default. + */ +int +v_lgoto(sp, ep, vp, fm, tm, rp) + SCR *sp; + EXF *ep; + VICMDARG *vp; + MARK *fm, *tm, *rp; +{ + recno_t last; + + if (file_lline(sp, ep, &last)) + return (1); + if (F_ISSET(vp, VC_C1SET)) { + if (last < vp->count) { + v_eof(sp, ep, fm); + return (1); + } + rp->lno = vp->count; + } else + rp->lno = last ? last : 1; + return (0); +} + +/* + * v_home -- [count]H + * Move to the first non-blank character of the logical line + * count from the top of the screen, 1 by default. + */ +int +v_home(sp, ep, vp, fm, tm, rp) + SCR *sp; + EXF *ep; + VICMDARG *vp; + MARK *fm, *tm, *rp; +{ + return (sp->s_position(sp, ep, rp, + F_ISSET(vp, VC_C1SET) ? vp->count : 0, P_TOP)); +} + +/* + * v_middle -- M + * Move to the first non-blank character of the logical line + * in the middle of the screen. + */ +int +v_middle(sp, ep, vp, fm, tm, rp) + SCR *sp; + EXF *ep; + VICMDARG *vp; + MARK *fm, *tm, *rp; +{ + /* + * Yielding to none in our quest for compatibility with every + * historical blemish of vi, no matter how strange it might be, + * we permit the user to enter a count and then ignore it. + */ + return (sp->s_position(sp, ep, rp, 0, P_MIDDLE)); +} + +/* + * v_bottom -- [count]L + * Move to the first non-blank character of the logical line + * count from the bottom of the screen, 1 by default. + */ +int +v_bottom(sp, ep, vp, fm, tm, rp) + SCR *sp; + EXF *ep; + VICMDARG *vp; + MARK *fm, *tm, *rp; +{ + return (sp->s_position(sp, ep, + rp, F_ISSET(vp, VC_C1SET) ? vp->count : 0, P_BOTTOM)); +} + +/* + * v_up -- [count]^P, [count]k, [count]- + * Move up by lines. + */ +int +v_up(sp, ep, vp, fm, tm, rp) + SCR *sp; + EXF *ep; + VICMDARG *vp; + MARK *fm, *tm, *rp; +{ + recno_t lno; + + lno = F_ISSET(vp, VC_C1SET) ? vp->count : 1; + + if (fm->lno <= lno) { + v_sof(sp, fm); + return (1); + } + rp->lno = fm->lno - lno; + return (0); +} + +/* + * v_cr -- [count]^M + * In a script window, send the line to the shell. + * In a regular window, move down by lines. + */ +int +v_cr(sp, ep, vp, fm, tm, rp) + SCR *sp; + EXF *ep; + VICMDARG *vp; + MARK *fm, *tm, *rp; +{ + /* + * If it's a script window, exec the line, + * otherwise it's the same as v_down(). + */ + return (F_ISSET(sp, S_SCRIPT) ? + sscr_exec(sp, ep, fm->lno) : v_down(sp, ep, vp, fm, tm, rp)); +} + +/* + * v_down -- [count]^J, [count]^N, [count]j, [count]^M, [count]+ + * Move down by lines. + */ +int +v_down(sp, ep, vp, fm, tm, rp) + SCR *sp; + EXF *ep; + VICMDARG *vp; + MARK *fm, *tm, *rp; +{ + recno_t lno; + + lno = fm->lno + (F_ISSET(vp, VC_C1SET) ? vp->count : 1); + + if (file_gline(sp, ep, lno, NULL) == NULL) { + v_eof(sp, ep, fm); + return (1); + } + rp->lno = lno; + return (0); +} + +/* + * v_hpageup -- [count]^U + * Page up half screens. + */ +int +v_hpageup(sp, ep, vp, fm, tm, rp) + SCR *sp; + EXF *ep; + VICMDARG *vp; + MARK *fm, *tm, *rp; +{ + /* + * Half screens always succeed unless already at SOF. Half screens + * set the scroll value, even if the command ultimately failed, in + * historic vi. It's probably a don't care. + */ + if (F_ISSET(vp, VC_C1SET)) + O_VAL(sp, O_SCROLL) = vp->count; + else + vp->count = O_VAL(sp, O_SCROLL); + + return (sp->s_down(sp, ep, rp, (recno_t)O_VAL(sp, O_SCROLL), 1)); +} + +/* + * v_hpagedown -- [count]^D + * Page down half screens. + */ +int +v_hpagedown(sp, ep, vp, fm, tm, rp) + SCR *sp; + EXF *ep; + VICMDARG *vp; + MARK *fm, *tm, *rp; +{ + /* + * Half screens always succeed unless already at EOF. Half screens + * set the scroll value, even if the command ultimately failed, in + * historic vi. It's probably a don't care. + */ + if (F_ISSET(vp, VC_C1SET)) + O_VAL(sp, O_SCROLL) = vp->count; + else + vp->count = O_VAL(sp, O_SCROLL); + + return (sp->s_up(sp, ep, rp, (recno_t)O_VAL(sp, O_SCROLL), 1)); +} + +/* + * v_pageup -- [count]^B + * Page up full screens. + * + * !!! + * Historic vi did not move to the SOF if the screen couldn't move, i.e. + * if SOF was already displayed on the screen. This implementation does + * move to SOF in that case, making ^B more like the the historic ^U. + */ +int +v_pageup(sp, ep, vp, fm, tm, rp) + SCR *sp; + EXF *ep; + VICMDARG *vp; + MARK *fm, *tm, *rp; +{ + recno_t count; + + /* Calculation from POSIX 1003.2/D8. */ + count = (F_ISSET(vp, VC_C1SET) ? vp->count : 1) * (sp->t_rows - 1); + + return (sp->s_down(sp, ep, rp, count, 1)); +} + +/* + * v_pagedown -- [count]^F + * Page down full screens. + * !!! + * Historic vi did not move to the EOF if the screen couldn't move, i.e. + * if EOF was already displayed on the screen. This implementation does + * move to EOF in that case, making ^F more like the the historic ^D. + */ +int +v_pagedown(sp, ep, vp, fm, tm, rp) + SCR *sp; + EXF *ep; + VICMDARG *vp; + MARK *fm, *tm, *rp; +{ + recno_t count; + + /* Calculation from POSIX 1003.2/D8. */ + count = (F_ISSET(vp, VC_C1SET) ? vp->count : 1) * (sp->t_rows - 1); + + return (sp->s_up(sp, ep, rp, count, 1)); +} + +/* + * v_lineup -- [count]^Y + * Page up by lines. + */ +int +v_lineup(sp, ep, vp, fm, tm, rp) + SCR *sp; + EXF *ep; + VICMDARG *vp; + MARK *fm, *tm, *rp; +{ + /* + * The cursor moves down, staying with its original line, unless it + * reaches the bottom of the screen. + */ + return (sp->s_down(sp, ep, + rp, F_ISSET(vp, VC_C1SET) ? vp->count : 1, 0)); +} + +/* + * v_linedown -- [count]^E + * Page down by lines. + */ +int +v_linedown(sp, ep, vp, fm, tm, rp) + SCR *sp; + EXF *ep; + VICMDARG *vp; + MARK *fm, *tm, *rp; +{ + /* + * The cursor moves up, staying with its original line, unless it + * reaches the top of the screen. + */ + return (sp->s_up(sp, ep, + rp, F_ISSET(vp, VC_C1SET) ? vp->count : 1, 0)); +} |