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Diffstat (limited to 'contrib/nvi/vi/vs_smap.c')
| -rw-r--r-- | contrib/nvi/vi/vs_smap.c | 1260 |
1 files changed, 1260 insertions, 0 deletions
diff --git a/contrib/nvi/vi/vs_smap.c b/contrib/nvi/vi/vs_smap.c new file mode 100644 index 0000000..af38057 --- /dev/null +++ b/contrib/nvi/vi/vs_smap.c @@ -0,0 +1,1260 @@ +/*- + * Copyright (c) 1993, 1994 + * The Regents of the University of California. All rights reserved. + * Copyright (c) 1993, 1994, 1995, 1996 + * Keith Bostic. All rights reserved. + * + * See the LICENSE file for redistribution information. + */ + +#include "config.h" + +#ifndef lint +static const char sccsid[] = "@(#)vs_smap.c 10.25 (Berkeley) 7/12/96"; +#endif /* not lint */ + +#include <sys/types.h> +#include <sys/queue.h> +#include <sys/time.h> + +#include <bitstring.h> +#include <limits.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include "../common/common.h" +#include "vi.h" + +static int vs_deleteln __P((SCR *, int)); +static int vs_insertln __P((SCR *, int)); +static int vs_sm_delete __P((SCR *, recno_t)); +static int vs_sm_down __P((SCR *, MARK *, recno_t, scroll_t, SMAP *)); +static int vs_sm_erase __P((SCR *)); +static int vs_sm_insert __P((SCR *, recno_t)); +static int vs_sm_reset __P((SCR *, recno_t)); +static int vs_sm_up __P((SCR *, MARK *, recno_t, scroll_t, SMAP *)); + +/* + * vs_change -- + * Make a change to the screen. + * + * PUBLIC: int vs_change __P((SCR *, recno_t, lnop_t)); + */ +int +vs_change(sp, lno, op) + SCR *sp; + recno_t lno; + lnop_t op; +{ + VI_PRIVATE *vip; + SMAP *p; + size_t cnt, oldy, oldx; + + vip = VIP(sp); + + /* + * XXX + * Very nasty special case. The historic vi code displays a single + * space (or a '$' if the list option is set) for the first line in + * an "empty" file. If we "insert" a line, that line gets scrolled + * down, not repainted, so it's incorrect when we refresh the screen. + * The vi text input functions detect it explicitly and don't insert + * a new line. + * + * Check for line #2 before going to the end of the file. + */ + if ((op == LINE_APPEND && lno == 0 || op == LINE_INSERT && lno == 1) && + !db_exist(sp, 2)) { + lno = 1; + op = LINE_RESET; + } + + /* Appending is the same as inserting, if the line is incremented. */ + if (op == LINE_APPEND) { + ++lno; + op = LINE_INSERT; + } + + /* Ignore the change if the line is after the map. */ + if (lno > TMAP->lno) + return (0); + + /* + * If the line is before the map, and it's a decrement, decrement + * the map. If it's an increment, increment the map. Otherwise, + * ignore it. + */ + if (lno < HMAP->lno) { + switch (op) { + case LINE_APPEND: + abort(); + /* NOTREACHED */ + case LINE_DELETE: + for (p = HMAP, cnt = sp->t_rows; cnt--; ++p) + --p->lno; + if (sp->lno >= lno) + --sp->lno; + F_SET(vip, VIP_N_RENUMBER); + break; + case LINE_INSERT: + for (p = HMAP, cnt = sp->t_rows; cnt--; ++p) + ++p->lno; + if (sp->lno >= lno) + ++sp->lno; + F_SET(vip, VIP_N_RENUMBER); + break; + case LINE_RESET: + break; + } + return (0); + } + + F_SET(vip, VIP_N_REFRESH); + + /* + * Invalidate the line size cache, and invalidate the cursor if it's + * on this line, + */ + VI_SCR_CFLUSH(vip); + if (sp->lno == lno) + F_SET(vip, VIP_CUR_INVALID); + + /* + * If ex modifies the screen after ex output is already on the screen + * or if we've switched into ex canonical mode, don't touch it -- we'll + * get scrolling wrong, at best. + */ + if (!F_ISSET(sp, SC_TINPUT_INFO) && + (F_ISSET(sp, SC_SCR_EXWROTE) || VIP(sp)->totalcount > 1)) { + F_SET(vip, VIP_N_EX_REDRAW); + return (0); + } + + /* Save and restore the cursor for these routines. */ + (void)sp->gp->scr_cursor(sp, &oldy, &oldx); + + switch (op) { + case LINE_DELETE: + if (vs_sm_delete(sp, lno)) + return (1); + F_SET(vip, VIP_N_RENUMBER); + break; + case LINE_INSERT: + if (vs_sm_insert(sp, lno)) + return (1); + F_SET(vip, VIP_N_RENUMBER); + break; + case LINE_RESET: + if (vs_sm_reset(sp, lno)) + return (1); + break; + default: + abort(); + } + + (void)sp->gp->scr_move(sp, oldy, oldx); + return (0); +} + +/* + * vs_sm_fill -- + * Fill in the screen map, placing the specified line at the + * right position. There isn't any way to tell if an SMAP + * entry has been filled in, so this routine had better be + * called with P_FILL set before anything else is done. + * + * !!! + * Unexported interface: if lno is OOBLNO, P_TOP means that the HMAP + * slot is already filled in, P_BOTTOM means that the TMAP slot is + * already filled in, and we just finish up the job. + * + * PUBLIC: int vs_sm_fill __P((SCR *, recno_t, pos_t)); + */ +int +vs_sm_fill(sp, lno, pos) + SCR *sp; + recno_t lno; + pos_t pos; +{ + SMAP *p, tmp; + size_t cnt; + + /* Flush all cached information from the SMAP. */ + for (p = HMAP, cnt = sp->t_rows; cnt--; ++p) + SMAP_FLUSH(p); + + /* + * If the map is filled, the screen must be redrawn. + * + * XXX + * This is a bug. We should try and figure out if the desired line + * is already in the map or close by -- scrolling the screen would + * be a lot better than redrawing. + */ + F_SET(sp, SC_SCR_REDRAW); + + switch (pos) { + case P_FILL: + tmp.lno = 1; + tmp.coff = 0; + tmp.soff = 1; + + /* See if less than half a screen from the top. */ + if (vs_sm_nlines(sp, + &tmp, lno, HALFTEXT(sp)) <= HALFTEXT(sp)) { + lno = 1; + goto top; + } + + /* See if less than half a screen from the bottom. */ + if (db_last(sp, &tmp.lno)) + return (1); + tmp.coff = 0; + tmp.soff = vs_screens(sp, tmp.lno, NULL); + if (vs_sm_nlines(sp, + &tmp, lno, HALFTEXT(sp)) <= HALFTEXT(sp)) { + TMAP->lno = tmp.lno; + TMAP->coff = tmp.coff; + TMAP->soff = tmp.soff; + goto bottom; + } + goto middle; + case P_TOP: + if (lno != OOBLNO) { +top: HMAP->lno = lno; + HMAP->coff = 0; + HMAP->soff = 1; + } + /* If we fail, just punt. */ + for (p = HMAP, cnt = sp->t_rows; --cnt; ++p) + if (vs_sm_next(sp, p, p + 1)) + goto err; + break; + case P_MIDDLE: + /* If we fail, guess that the file is too small. */ +middle: p = HMAP + sp->t_rows / 2; + p->lno = lno; + p->coff = 0; + p->soff = 1; + for (; p > HMAP; --p) + if (vs_sm_prev(sp, p, p - 1)) { + lno = 1; + goto top; + } + + /* If we fail, just punt. */ + p = HMAP + sp->t_rows / 2; + for (; p < TMAP; ++p) + if (vs_sm_next(sp, p, p + 1)) + goto err; + break; + case P_BOTTOM: + if (lno != OOBLNO) { + TMAP->lno = lno; + TMAP->coff = 0; + TMAP->soff = vs_screens(sp, lno, NULL); + } + /* If we fail, guess that the file is too small. */ +bottom: for (p = TMAP; p > HMAP; --p) + if (vs_sm_prev(sp, p, p - 1)) { + lno = 1; + goto top; + } + break; + default: + abort(); + } + return (0); + + /* + * Try and put *something* on the screen. If this fails, we have a + * serious hard error. + */ +err: HMAP->lno = 1; + HMAP->coff = 0; + HMAP->soff = 1; + for (p = HMAP; p < TMAP; ++p) + if (vs_sm_next(sp, p, p + 1)) + return (1); + return (0); +} + +/* + * For the routines vs_sm_reset, vs_sm_delete and vs_sm_insert: if the + * screen contains only a single line (whether because the screen is small + * or the line large), it gets fairly exciting. Skip the fun, set a flag + * so the screen map is refilled and the screen redrawn, and return. This + * is amazingly slow, but it's not clear that anyone will care. + */ +#define HANDLE_WEIRDNESS(cnt) { \ + if (cnt >= sp->t_rows) { \ + F_SET(sp, SC_SCR_REFORMAT); \ + return (0); \ + } \ +} + +/* + * vs_sm_delete -- + * Delete a line out of the SMAP. + */ +static int +vs_sm_delete(sp, lno) + SCR *sp; + recno_t lno; +{ + SMAP *p, *t; + size_t cnt_orig; + + /* + * Find the line in the map, and count the number of screen lines + * which display any part of the deleted line. + */ + for (p = HMAP; p->lno != lno; ++p); + if (O_ISSET(sp, O_LEFTRIGHT)) + cnt_orig = 1; + else + for (cnt_orig = 1, t = p + 1; + t <= TMAP && t->lno == lno; ++cnt_orig, ++t); + + HANDLE_WEIRDNESS(cnt_orig); + + /* Delete that many lines from the screen. */ + (void)sp->gp->scr_move(sp, p - HMAP, 0); + if (vs_deleteln(sp, cnt_orig)) + return (1); + + /* Shift the screen map up. */ + memmove(p, p + cnt_orig, (((TMAP - p) - cnt_orig) + 1) * sizeof(SMAP)); + + /* Decrement the line numbers for the rest of the map. */ + for (t = TMAP - cnt_orig; p <= t; ++p) + --p->lno; + + /* Display the new lines. */ + for (p = TMAP - cnt_orig;;) { + if (p < TMAP && vs_sm_next(sp, p, p + 1)) + return (1); + /* vs_sm_next() flushed the cache. */ + if (vs_line(sp, ++p, NULL, NULL)) + return (1); + if (p == TMAP) + break; + } + return (0); +} + +/* + * vs_sm_insert -- + * Insert a line into the SMAP. + */ +static int +vs_sm_insert(sp, lno) + SCR *sp; + recno_t lno; +{ + SMAP *p, *t; + size_t cnt_orig, cnt, coff; + + /* Save the offset. */ + coff = HMAP->coff; + + /* + * Find the line in the map, find out how many screen lines + * needed to display the line. + */ + for (p = HMAP; p->lno != lno; ++p); + + cnt_orig = vs_screens(sp, lno, NULL); + HANDLE_WEIRDNESS(cnt_orig); + + /* + * The lines left in the screen override the number of screen + * lines in the inserted line. + */ + cnt = (TMAP - p) + 1; + if (cnt_orig > cnt) + cnt_orig = cnt; + + /* Push down that many lines. */ + (void)sp->gp->scr_move(sp, p - HMAP, 0); + if (vs_insertln(sp, cnt_orig)) + return (1); + + /* Shift the screen map down. */ + memmove(p + cnt_orig, p, (((TMAP - p) - cnt_orig) + 1) * sizeof(SMAP)); + + /* Increment the line numbers for the rest of the map. */ + for (t = p + cnt_orig; t <= TMAP; ++t) + ++t->lno; + + /* Fill in the SMAP for the new lines, and display. */ + for (cnt = 1, t = p; cnt <= cnt_orig; ++t, ++cnt) { + t->lno = lno; + t->coff = coff; + t->soff = cnt; + SMAP_FLUSH(t); + if (vs_line(sp, t, NULL, NULL)) + return (1); + } + return (0); +} + +/* + * vs_sm_reset -- + * Reset a line in the SMAP. + */ +static int +vs_sm_reset(sp, lno) + SCR *sp; + recno_t lno; +{ + SMAP *p, *t; + size_t cnt_orig, cnt_new, cnt, diff; + + /* + * See if the number of on-screen rows taken up by the old display + * for the line is the same as the number needed for the new one. + * If so, repaint, otherwise do it the hard way. + */ + for (p = HMAP; p->lno != lno; ++p); + if (O_ISSET(sp, O_LEFTRIGHT)) { + t = p; + cnt_orig = cnt_new = 1; + } else { + for (cnt_orig = 0, + t = p; t <= TMAP && t->lno == lno; ++cnt_orig, ++t); + cnt_new = vs_screens(sp, lno, NULL); + } + + HANDLE_WEIRDNESS(cnt_orig); + + if (cnt_orig == cnt_new) { + do { + SMAP_FLUSH(p); + if (vs_line(sp, p, NULL, NULL)) + return (1); + } while (++p < t); + return (0); + } + + if (cnt_orig < cnt_new) { + /* Get the difference. */ + diff = cnt_new - cnt_orig; + + /* + * The lines left in the screen override the number of screen + * lines in the inserted line. + */ + cnt = (TMAP - p) + 1; + if (diff > cnt) + diff = cnt; + + /* If there are any following lines, push them down. */ + if (cnt > 1) { + (void)sp->gp->scr_move(sp, p - HMAP, 0); + if (vs_insertln(sp, diff)) + return (1); + + /* Shift the screen map down. */ + memmove(p + diff, p, + (((TMAP - p) - diff) + 1) * sizeof(SMAP)); + } + + /* Fill in the SMAP for the replaced line, and display. */ + for (cnt = 1, t = p; cnt_new-- && t <= TMAP; ++t, ++cnt) { + t->lno = lno; + t->soff = cnt; + SMAP_FLUSH(t); + if (vs_line(sp, t, NULL, NULL)) + return (1); + } + } else { + /* Get the difference. */ + diff = cnt_orig - cnt_new; + + /* Delete that many lines from the screen. */ + (void)sp->gp->scr_move(sp, p - HMAP, 0); + if (vs_deleteln(sp, diff)) + return (1); + + /* Shift the screen map up. */ + memmove(p, p + diff, (((TMAP - p) - diff) + 1) * sizeof(SMAP)); + + /* Fill in the SMAP for the replaced line, and display. */ + for (cnt = 1, t = p; cnt_new--; ++t, ++cnt) { + t->lno = lno; + t->soff = cnt; + SMAP_FLUSH(t); + if (vs_line(sp, t, NULL, NULL)) + return (1); + } + + /* Display the new lines at the bottom of the screen. */ + for (t = TMAP - diff;;) { + if (t < TMAP && vs_sm_next(sp, t, t + 1)) + return (1); + /* vs_sm_next() flushed the cache. */ + if (vs_line(sp, ++t, NULL, NULL)) + return (1); + if (t == TMAP) + break; + } + } + return (0); +} + +/* + * vs_sm_scroll + * Scroll the SMAP up/down count logical lines. Different + * semantics based on the vi command, *sigh*. + * + * PUBLIC: int vs_sm_scroll __P((SCR *, MARK *, recno_t, scroll_t)); + */ +int +vs_sm_scroll(sp, rp, count, scmd) + SCR *sp; + MARK *rp; + recno_t count; + scroll_t scmd; +{ + SMAP *smp; + + /* + * Invalidate the cursor. The line is probably going to change, + * (although for ^E and ^Y it may not). In any case, the scroll + * routines move the cursor to draw things. + */ + F_SET(VIP(sp), VIP_CUR_INVALID); + + /* Find the cursor in the screen. */ + if (vs_sm_cursor(sp, &smp)) + return (1); + + switch (scmd) { + case CNTRL_B: + case CNTRL_U: + case CNTRL_Y: + case Z_CARAT: + if (vs_sm_down(sp, rp, count, scmd, smp)) + return (1); + break; + case CNTRL_D: + case CNTRL_E: + case CNTRL_F: + case Z_PLUS: + if (vs_sm_up(sp, rp, count, scmd, smp)) + return (1); + break; + default: + abort(); + } + + /* + * !!! + * If we're at the start of a line, go for the first non-blank. + * This makes it look like the old vi, even though we're moving + * around by logical lines, not physical ones. + * + * XXX + * In the presence of a long line, which has more than a screen + * width of leading spaces, this code can cause a cursor warp. + * Live with it. + */ + if (scmd != CNTRL_E && scmd != CNTRL_Y && + rp->cno == 0 && nonblank(sp, rp->lno, &rp->cno)) + return (1); + + return (0); +} + +/* + * vs_sm_up -- + * Scroll the SMAP up count logical lines. + */ +static int +vs_sm_up(sp, rp, count, scmd, smp) + SCR *sp; + MARK *rp; + scroll_t scmd; + recno_t count; + SMAP *smp; +{ + int cursor_set, echanged, zset; + SMAP *ssmp, s1, s2; + + /* + * Check to see if movement is possible. + * + * Get the line after the map. If that line is a new one (and if + * O_LEFTRIGHT option is set, this has to be true), and the next + * line doesn't exist, and the cursor doesn't move, or the cursor + * isn't even on the screen, or the cursor is already at the last + * line in the map, it's an error. If that test succeeded because + * the cursor wasn't at the end of the map, test to see if the map + * is mostly empty. + */ + if (vs_sm_next(sp, TMAP, &s1)) + return (1); + if (s1.lno > TMAP->lno && !db_exist(sp, s1.lno)) { + if (scmd == CNTRL_E || scmd == Z_PLUS || smp == TMAP) { + v_eof(sp, NULL); + return (1); + } + if (vs_sm_next(sp, smp, &s1)) + return (1); + if (s1.lno > smp->lno && !db_exist(sp, s1.lno)) { + v_eof(sp, NULL); + return (1); + } + } + + /* + * Small screens: see vs_refresh.c section 6a. + * + * If it's a small screen, and the movement isn't larger than a + * screen, i.e some context will remain, open up the screen and + * display by scrolling. In this case, the cursor moves down one + * line for each line displayed. Otherwise, erase/compress and + * repaint, and move the cursor to the first line in the screen. + * Note, the ^F command is always in the latter case, for historical + * reasons. + */ + cursor_set = 0; + if (IS_SMALL(sp)) { + if (count >= sp->t_maxrows || scmd == CNTRL_F) { + s1 = TMAP[0]; + if (vs_sm_erase(sp)) + return (1); + for (; count--; s1 = s2) { + if (vs_sm_next(sp, &s1, &s2)) + return (1); + if (s2.lno != s1.lno && !db_exist(sp, s2.lno)) + break; + } + TMAP[0] = s2; + if (vs_sm_fill(sp, OOBLNO, P_BOTTOM)) + return (1); + return (vs_sm_position(sp, rp, 0, P_TOP)); + } + cursor_set = scmd == CNTRL_E || vs_sm_cursor(sp, &ssmp); + for (; count && + sp->t_rows != sp->t_maxrows; --count, ++sp->t_rows) { + if (vs_sm_next(sp, TMAP, &s1)) + return (1); + if (TMAP->lno != s1.lno && !db_exist(sp, s1.lno)) + break; + *++TMAP = s1; + /* vs_sm_next() flushed the cache. */ + if (vs_line(sp, TMAP, NULL, NULL)) + return (1); + + if (!cursor_set) + ++ssmp; + } + if (!cursor_set) { + rp->lno = ssmp->lno; + rp->cno = ssmp->c_sboff; + } + if (count == 0) + return (0); + } + + for (echanged = zset = 0; count; --count) { + /* Decide what would show up on the screen. */ + if (vs_sm_next(sp, TMAP, &s1)) + return (1); + + /* If the line doesn't exist, we're done. */ + if (TMAP->lno != s1.lno && !db_exist(sp, s1.lno)) + break; + + /* Scroll the screen cursor up one logical line. */ + if (vs_sm_1up(sp)) + return (1); + switch (scmd) { + case CNTRL_E: + if (smp > HMAP) + --smp; + else + echanged = 1; + break; + case Z_PLUS: + if (zset) { + if (smp > HMAP) + --smp; + } else { + smp = TMAP; + zset = 1; + } + /* FALLTHROUGH */ + default: + break; + } + } + + if (cursor_set) + return(0); + + switch (scmd) { + case CNTRL_E: + /* + * On a ^E that was forced to change lines, try and keep the + * cursor as close as possible to the last position, but also + * set it up so that the next "real" movement will return the + * cursor to the closest position to the last real movement. + */ + if (echanged) { + rp->lno = smp->lno; + rp->cno = vs_colpos(sp, smp->lno, + (O_ISSET(sp, O_LEFTRIGHT) ? + smp->coff : (smp->soff - 1) * sp->cols) + + sp->rcm % sp->cols); + } + return (0); + case CNTRL_F: + /* + * If there are more lines, the ^F command is positioned at + * the first line of the screen. + */ + if (!count) { + smp = HMAP; + break; + } + /* FALLTHROUGH */ + case CNTRL_D: + /* + * The ^D and ^F commands move the cursor towards EOF + * if there are more lines to move. Check to be sure + * the lines actually exist. (They may not if the + * file is smaller than the screen.) + */ + for (; count; --count, ++smp) + if (smp == TMAP || !db_exist(sp, smp[1].lno)) + break; + break; + case Z_PLUS: + /* The z+ command moves the cursor to the first new line. */ + break; + default: + abort(); + } + + if (!SMAP_CACHE(smp) && vs_line(sp, smp, NULL, NULL)) + return (1); + rp->lno = smp->lno; + rp->cno = smp->c_sboff; + return (0); +} + +/* + * vs_sm_1up -- + * Scroll the SMAP up one. + * + * PUBLIC: int vs_sm_1up __P((SCR *)); + */ +int +vs_sm_1up(sp) + SCR *sp; +{ + /* + * Delete the top line of the screen. Shift the screen map + * up and display a new line at the bottom of the screen. + */ + (void)sp->gp->scr_move(sp, 0, 0); + if (vs_deleteln(sp, 1)) + return (1); + + /* One-line screens can fail. */ + if (IS_ONELINE(sp)) { + if (vs_sm_next(sp, TMAP, TMAP)) + return (1); + } else { + memmove(HMAP, HMAP + 1, (sp->rows - 1) * sizeof(SMAP)); + if (vs_sm_next(sp, TMAP - 1, TMAP)) + return (1); + } + /* vs_sm_next() flushed the cache. */ + return (vs_line(sp, TMAP, NULL, NULL)); +} + +/* + * vs_deleteln -- + * Delete a line a la curses, make sure to put the information + * line and other screens back. + */ +static int +vs_deleteln(sp, cnt) + SCR *sp; + int cnt; +{ + GS *gp; + size_t oldy, oldx; + + gp = sp->gp; + if (IS_ONELINE(sp)) + (void)gp->scr_clrtoeol(sp); + else { + (void)gp->scr_cursor(sp, &oldy, &oldx); + while (cnt--) { + (void)gp->scr_deleteln(sp); + (void)gp->scr_move(sp, LASTLINE(sp), 0); + (void)gp->scr_insertln(sp); + (void)gp->scr_move(sp, oldy, oldx); + } + } + return (0); +} + +/* + * vs_sm_down -- + * Scroll the SMAP down count logical lines. + */ +static int +vs_sm_down(sp, rp, count, scmd, smp) + SCR *sp; + MARK *rp; + recno_t count; + SMAP *smp; + scroll_t scmd; +{ + SMAP *ssmp, s1, s2; + int cursor_set, ychanged, zset; + + /* Check to see if movement is possible. */ + if (HMAP->lno == 1 && + (O_ISSET(sp, O_LEFTRIGHT) || HMAP->soff == 1) && + (scmd == CNTRL_Y || scmd == Z_CARAT || smp == HMAP)) { + v_sof(sp, NULL); + return (1); + } + + /* + * Small screens: see vs_refresh.c section 6a. + * + * If it's a small screen, and the movement isn't larger than a + * screen, i.e some context will remain, open up the screen and + * display by scrolling. In this case, the cursor moves up one + * line for each line displayed. Otherwise, erase/compress and + * repaint, and move the cursor to the first line in the screen. + * Note, the ^B command is always in the latter case, for historical + * reasons. + */ + cursor_set = scmd == CNTRL_Y; + if (IS_SMALL(sp)) { + if (count >= sp->t_maxrows || scmd == CNTRL_B) { + s1 = HMAP[0]; + if (vs_sm_erase(sp)) + return (1); + for (; count--; s1 = s2) { + if (vs_sm_prev(sp, &s1, &s2)) + return (1); + if (s2.lno == 1 && + (O_ISSET(sp, O_LEFTRIGHT) || s2.soff == 1)) + break; + } + HMAP[0] = s2; + if (vs_sm_fill(sp, OOBLNO, P_TOP)) + return (1); + return (vs_sm_position(sp, rp, 0, P_BOTTOM)); + } + cursor_set = scmd == CNTRL_Y || vs_sm_cursor(sp, &ssmp); + for (; count && + sp->t_rows != sp->t_maxrows; --count, ++sp->t_rows) { + if (HMAP->lno == 1 && + (O_ISSET(sp, O_LEFTRIGHT) || HMAP->soff == 1)) + break; + ++TMAP; + if (vs_sm_1down(sp)) + return (1); + } + if (!cursor_set) { + rp->lno = ssmp->lno; + rp->cno = ssmp->c_sboff; + } + if (count == 0) + return (0); + } + + for (ychanged = zset = 0; count; --count) { + /* If the line doesn't exist, we're done. */ + if (HMAP->lno == 1 && + (O_ISSET(sp, O_LEFTRIGHT) || HMAP->soff == 1)) + break; + + /* Scroll the screen and cursor down one logical line. */ + if (vs_sm_1down(sp)) + return (1); + switch (scmd) { + case CNTRL_Y: + if (smp < TMAP) + ++smp; + else + ychanged = 1; + break; + case Z_CARAT: + if (zset) { + if (smp < TMAP) + ++smp; + } else { + smp = HMAP; + zset = 1; + } + /* FALLTHROUGH */ + default: + break; + } + } + + if (scmd != CNTRL_Y && cursor_set) + return(0); + + switch (scmd) { + case CNTRL_B: + /* + * If there are more lines, the ^B command is positioned at + * the last line of the screen. However, the line may not + * exist. + */ + if (!count) { + for (smp = TMAP; smp > HMAP; --smp) + if (db_exist(sp, smp->lno)) + break; + break; + } + /* FALLTHROUGH */ + case CNTRL_U: + /* + * The ^B and ^U commands move the cursor towards SOF + * if there are more lines to move. + */ + if (count < smp - HMAP) + smp -= count; + else + smp = HMAP; + break; + case CNTRL_Y: + /* + * On a ^Y that was forced to change lines, try and keep the + * cursor as close as possible to the last position, but also + * set it up so that the next "real" movement will return the + * cursor to the closest position to the last real movement. + */ + if (ychanged) { + rp->lno = smp->lno; + rp->cno = vs_colpos(sp, smp->lno, + (O_ISSET(sp, O_LEFTRIGHT) ? + smp->coff : (smp->soff - 1) * sp->cols) + + sp->rcm % sp->cols); + } + return (0); + case Z_CARAT: + /* The z^ command moves the cursor to the first new line. */ + break; + default: + abort(); + } + + if (!SMAP_CACHE(smp) && vs_line(sp, smp, NULL, NULL)) + return (1); + rp->lno = smp->lno; + rp->cno = smp->c_sboff; + return (0); +} + +/* + * vs_sm_erase -- + * Erase the small screen area for the scrolling functions. + */ +static int +vs_sm_erase(sp) + SCR *sp; +{ + GS *gp; + + gp = sp->gp; + (void)gp->scr_move(sp, LASTLINE(sp), 0); + (void)gp->scr_clrtoeol(sp); + for (; sp->t_rows > sp->t_minrows; --sp->t_rows, --TMAP) { + (void)gp->scr_move(sp, TMAP - HMAP, 0); + (void)gp->scr_clrtoeol(sp); + } + return (0); +} + +/* + * vs_sm_1down -- + * Scroll the SMAP down one. + * + * PUBLIC: int vs_sm_1down __P((SCR *)); + */ +int +vs_sm_1down(sp) + SCR *sp; +{ + /* + * Insert a line at the top of the screen. Shift the screen map + * down and display a new line at the top of the screen. + */ + (void)sp->gp->scr_move(sp, 0, 0); + if (vs_insertln(sp, 1)) + return (1); + + /* One-line screens can fail. */ + if (IS_ONELINE(sp)) { + if (vs_sm_prev(sp, HMAP, HMAP)) + return (1); + } else { + memmove(HMAP + 1, HMAP, (sp->rows - 1) * sizeof(SMAP)); + if (vs_sm_prev(sp, HMAP + 1, HMAP)) + return (1); + } + /* vs_sm_prev() flushed the cache. */ + return (vs_line(sp, HMAP, NULL, NULL)); +} + +/* + * vs_insertln -- + * Insert a line a la curses, make sure to put the information + * line and other screens back. + */ +static int +vs_insertln(sp, cnt) + SCR *sp; + int cnt; +{ + GS *gp; + size_t oldy, oldx; + + gp = sp->gp; + if (IS_ONELINE(sp)) { + (void)gp->scr_move(sp, LASTLINE(sp), 0); + (void)gp->scr_clrtoeol(sp); + } else { + (void)gp->scr_cursor(sp, &oldy, &oldx); + while (cnt--) { + (void)gp->scr_move(sp, LASTLINE(sp) - 1, 0); + (void)gp->scr_deleteln(sp); + (void)gp->scr_move(sp, oldy, oldx); + (void)gp->scr_insertln(sp); + } + } + return (0); +} + +/* + * vs_sm_next -- + * Fill in the next entry in the SMAP. + * + * PUBLIC: int vs_sm_next __P((SCR *, SMAP *, SMAP *)); + */ +int +vs_sm_next(sp, p, t) + SCR *sp; + SMAP *p, *t; +{ + size_t lcnt; + + SMAP_FLUSH(t); + if (O_ISSET(sp, O_LEFTRIGHT)) { + t->lno = p->lno + 1; + t->coff = p->coff; + } else { + lcnt = vs_screens(sp, p->lno, NULL); + if (lcnt == p->soff) { + t->lno = p->lno + 1; + t->soff = 1; + } else { + t->lno = p->lno; + t->soff = p->soff + 1; + } + } + return (0); +} + +/* + * vs_sm_prev -- + * Fill in the previous entry in the SMAP. + * + * PUBLIC: int vs_sm_prev __P((SCR *, SMAP *, SMAP *)); + */ +int +vs_sm_prev(sp, p, t) + SCR *sp; + SMAP *p, *t; +{ + SMAP_FLUSH(t); + if (O_ISSET(sp, O_LEFTRIGHT)) { + t->lno = p->lno - 1; + t->coff = p->coff; + } else { + if (p->soff != 1) { + t->lno = p->lno; + t->soff = p->soff - 1; + } else { + t->lno = p->lno - 1; + t->soff = vs_screens(sp, t->lno, NULL); + } + } + return (t->lno == 0); +} + +/* + * vs_sm_cursor -- + * Return the SMAP entry referenced by the cursor. + * + * PUBLIC: int vs_sm_cursor __P((SCR *, SMAP **)); + */ +int +vs_sm_cursor(sp, smpp) + SCR *sp; + SMAP **smpp; +{ + SMAP *p; + + /* See if the cursor is not in the map. */ + if (sp->lno < HMAP->lno || sp->lno > TMAP->lno) + return (1); + + /* Find the first occurence of the line. */ + for (p = HMAP; p->lno != sp->lno; ++p); + + /* Fill in the map information until we find the right line. */ + for (; p <= TMAP; ++p) { + /* Short lines are common and easy to detect. */ + if (p != TMAP && (p + 1)->lno != p->lno) { + *smpp = p; + return (0); + } + if (!SMAP_CACHE(p) && vs_line(sp, p, NULL, NULL)) + return (1); + if (p->c_eboff >= sp->cno) { + *smpp = p; + return (0); + } + } + + /* It was past the end of the map after all. */ + return (1); +} + +/* + * vs_sm_position -- + * Return the line/column of the top, middle or last line on the screen. + * (The vi H, M and L commands.) Here because only the screen routines + * know what's really out there. + * + * PUBLIC: int vs_sm_position __P((SCR *, MARK *, u_long, pos_t)); + */ +int +vs_sm_position(sp, rp, cnt, pos) + SCR *sp; + MARK *rp; + u_long cnt; + pos_t pos; +{ + SMAP *smp; + recno_t last; + + switch (pos) { + case P_TOP: + /* + * !!! + * Historically, an invalid count to the H command failed. + * We do nothing special here, just making sure that H in + * an empty screen works. + */ + if (cnt > TMAP - HMAP) + goto sof; + smp = HMAP + cnt; + if (cnt && !db_exist(sp, smp->lno)) { +sof: msgq(sp, M_BERR, "220|Movement past the end-of-screen"); + return (1); + } + break; + case P_MIDDLE: + /* + * !!! + * Historically, a count to the M command was ignored. + * If the screen isn't filled, find the middle of what's + * real and move there. + */ + if (!db_exist(sp, TMAP->lno)) { + if (db_last(sp, &last)) + return (1); + for (smp = TMAP; smp->lno > last && smp > HMAP; --smp); + if (smp > HMAP) + smp -= (smp - HMAP) / 2; + } else + smp = (HMAP + (TMAP - HMAP) / 2) + cnt; + break; + case P_BOTTOM: + /* + * !!! + * Historically, an invalid count to the L command failed. + * If the screen isn't filled, find the bottom of what's + * real and try to offset from there. + */ + if (cnt > TMAP - HMAP) + goto eof; + smp = TMAP - cnt; + if (!db_exist(sp, smp->lno)) { + if (db_last(sp, &last)) + return (1); + for (; smp->lno > last && smp > HMAP; --smp); + if (cnt > smp - HMAP) { +eof: msgq(sp, M_BERR, + "221|Movement past the beginning-of-screen"); + return (1); + } + smp -= cnt; + } + break; + default: + abort(); + } + + /* Make sure that the cached information is valid. */ + if (!SMAP_CACHE(smp) && vs_line(sp, smp, NULL, NULL)) + return (1); + rp->lno = smp->lno; + rp->cno = smp->c_sboff; + + return (0); +} + +/* + * vs_sm_nlines -- + * Return the number of screen lines from an SMAP entry to the + * start of some file line, less than a maximum value. + * + * PUBLIC: recno_t vs_sm_nlines __P((SCR *, SMAP *, recno_t, size_t)); + */ +recno_t +vs_sm_nlines(sp, from_sp, to_lno, max) + SCR *sp; + SMAP *from_sp; + recno_t to_lno; + size_t max; +{ + recno_t lno, lcnt; + + if (O_ISSET(sp, O_LEFTRIGHT)) + return (from_sp->lno > to_lno ? + from_sp->lno - to_lno : to_lno - from_sp->lno); + + if (from_sp->lno == to_lno) + return (from_sp->soff - 1); + + if (from_sp->lno > to_lno) { + lcnt = from_sp->soff - 1; /* Correct for off-by-one. */ + for (lno = from_sp->lno; --lno >= to_lno && lcnt <= max;) + lcnt += vs_screens(sp, lno, NULL); + } else { + lno = from_sp->lno; + lcnt = (vs_screens(sp, lno, NULL) - from_sp->soff) + 1; + for (; ++lno < to_lno && lcnt <= max;) + lcnt += vs_screens(sp, lno, NULL); + } + return (lcnt); +} |
