diff options
Diffstat (limited to 'usr.bin/vi/svi/svi_relative.c')
| -rw-r--r-- | usr.bin/vi/svi/svi_relative.c | 334 |
1 files changed, 334 insertions, 0 deletions
diff --git a/usr.bin/vi/svi/svi_relative.c b/usr.bin/vi/svi/svi_relative.c new file mode 100644 index 00000000000..31575b975f9 --- /dev/null +++ b/usr.bin/vi/svi/svi_relative.c @@ -0,0 +1,334 @@ +/*- + * Copyright (c) 1993, 1994 + * 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[] = "@(#)svi_relative.c 8.18 (Berkeley) 8/17/94"; +#endif /* not lint */ + +#include <sys/types.h> +#include <sys/queue.h> +#include <sys/time.h> + +#include <bitstring.h> +#include <limits.h> +#include <signal.h> +#include <stdio.h> +#include <string.h> +#include <termios.h> + +#include "compat.h" +#include <db.h> +#include <regex.h> + +#include "vi.h" +#include "svi_screen.h" + +static size_t svi_screens + __P((SCR *, EXF *, char *, size_t, recno_t, size_t *)); + +/* + * svi_column -- + * Return the logical column of the cursor. + */ +int +svi_column(sp, ep, cp) + SCR *sp; + EXF *ep; + size_t *cp; +{ + size_t col; + + col = SVP(sp)->sc_col; + if (O_ISSET(sp, O_NUMBER)) + col -= O_NUMBER_LENGTH; + *cp = col; + return (0); +} + +/* + * svi_opt_screens -- + * Return the screen columns necessary to display the line, or + * if specified, the physical character column within the line, + * including space required for the O_NUMBER and O_LIST options. + */ +size_t +svi_opt_screens(sp, ep, lno, cnop) + SCR *sp; + EXF *ep; + recno_t lno; + size_t *cnop; +{ + size_t cols, screens; + + /* + * Check for a cached value. We maintain a cache because, if the + * line is large, this routine gets called repeatedly. One other + * hack, lots of time the cursor is on column one, which is an easy + * one. + */ + if (cnop == NULL) { + if (SVP(sp)->ss_lno == lno) + return (SVP(sp)->ss_screens); + } else if (*cnop == 0) + return (1); + + /* Figure out how many columns the line/column needs. */ + cols = svi_screens(sp, ep, NULL, 0, lno, cnop); + + /* Leading number if O_NUMBER option set. */ + if (O_ISSET(sp, O_NUMBER)) + cols += O_NUMBER_LENGTH; + + /* Trailing '$' if O_LIST option set. */ + if (O_ISSET(sp, O_LIST) && cnop == NULL) + cols += KEY_LEN(sp, '$'); + + screens = (cols / sp->cols + (cols % sp->cols ? 1 : 0)); + if (screens == 0) + screens = 1; + + /* Cache the value. */ + if (cnop == NULL) { + SVP(sp)->ss_lno = lno; + SVP(sp)->ss_screens = screens; + } + return (screens); +} + +/* + * svi_screens -- + * Return the screen columns necessary to display the line, or, + * if specified, the physical character column within the line. + */ +static size_t +svi_screens(sp, ep, lp, llen, lno, cnop) + SCR *sp; + EXF *ep; + char *lp; + size_t llen; + recno_t lno; + size_t *cnop; +{ + size_t chlen, cno, len, scno, tab_off; + int ch, listset; + char *p; + + /* Need the line to go any further. */ + if (lp == NULL) + lp = file_gline(sp, ep, lno, &llen); + + /* Missing or empty lines are easy. */ + if (lp == NULL || llen == 0) + return (0); + + listset = O_ISSET(sp, O_LIST); + +#define SET_CHLEN { \ + chlen = (ch = *(u_char *)p++) == '\t' && \ + !listset ? TAB_OFF(sp, tab_off) : KEY_LEN(sp, ch); \ +} +#define TAB_RESET { \ + /* \ + * If past the end of the screen, and the character was a tab, \ + * reset the screen column to 0. Otherwise, display the rest \ + * of the character on the next line. \ + */ \ + if ((tab_off += chlen) >= sp->cols) \ + if (ch == '\t') { \ + tab_off = 0; \ + scno -= scno % sp->cols; \ + } else \ + tab_off -= sp->cols; \ +} + p = lp; + len = llen; + scno = tab_off = 0; + if (cnop == NULL) + while (len--) { + SET_CHLEN; + scno += chlen; + TAB_RESET; + } + else + for (cno = *cnop; len--; --cno) { + SET_CHLEN; + scno += chlen; + TAB_RESET; + if (cno == 0) + break; + } + return (scno); +} + +/* + * svi_rcm -- + * Return the physical column from the line that will display a + * character closest to the currently most attractive character + * position (which is stored as a screen column). + */ +size_t +svi_rcm(sp, ep, lno) + SCR *sp; + EXF *ep; + recno_t lno; +{ + size_t len; + + /* Last character is easy, and common. */ + if (sp->rcm_last) + return (file_gline(sp, + ep, lno, &len) == NULL || len == 0 ? 0 : len - 1); + + /* First character is easy, and common. */ + if (HMAP->off == 1 && sp->rcm == 0) + return (0); + + /* + * Get svi_cm_private() to do the hard work. If doing leftright + * scrolling, we use the current screen offset, otherwise, use + * the first screen, i.e. an offset of 1. + * + * XXX + * I'm not sure that an offset of 1 is right. What happens is that + * the vi main loop calls us for the VM_RCM case. By using an offset + * of 1, we're assuming that every VM_RCM command changes lines, and + * that we want to position on the first screen for that line. This + * is currently the way it works, but it's not clean. I'd prefer it if + * we could find the SMAP entry the cursor references, and use that + * screen offset. Unfortunately, that's not going to be easy, as we + * don't keep that information around and it may be expensive to get. + */ + return (svi_cm_private(sp, ep, lno, + O_ISSET(sp, O_LEFTRIGHT) ? HMAP->off : 1, sp->rcm)); +} + +/* + * svi_cm_public -- + * Return the physical column from the line that will display a + * character closest to the specified screen column. + * + * The extra interface is because it's called by vi, which doesn't + * have a handle on the SMAP structure. + */ +size_t +svi_cm_public(sp, ep, lno, cno) + SCR *sp; + EXF *ep; + recno_t lno; + size_t cno; +{ + return (svi_cm_private(sp, ep, lno, HMAP->off, cno)); +} + +/* + * svi_cm_private -- + * Return the physical column from the line that will display a + * character closest to the specified screen column, taking into + * account the screen offset. + * + * The offset is for the commands that move logical distances, i.e. + * if it's a logical scroll the closest physical distance is based + * on the logical line, not the physical line. + */ +size_t +svi_cm_private(sp, ep, lno, off, cno) + SCR *sp; + EXF *ep; + recno_t lno; + size_t off, cno; +{ + size_t chlen, len, llen, scno, tab_off; + int ch, listset; + char *lp, *p; + + /* Need the line to go any further. */ + lp = file_gline(sp, ep, lno, &llen); + + /* Missing or empty lines are easy. */ + if (lp == NULL || llen == 0) + return (0); + + listset = O_ISSET(sp, O_LIST); + + /* Discard screen (logical) lines. */ + for (scno = 0, p = lp, len = llen; --off;) { + for (; len && scno < sp->cols; --len) + scno += (ch = *(u_char *)p++) == '\t' && + !listset ? TAB_OFF(sp, scno) : KEY_LEN(sp, ch); + + /* + * If reached the end of the physical line, return + * the last physical character in the line. + */ + if (len == 0) + return (llen - 1); + + /* + * If the character was a tab, reset the screen column to 0. + * Otherwise, the rest of the character is displayed on the + * next line. + */ + if (ch == '\t') + scno = 0; + else + scno -= sp->cols; + } + + /* Step through the line until reach the right character or EOL. */ + for (tab_off = scno; len--;) { + SET_CHLEN; + + /* + * If we've reached the specific character, there are three + * cases. + * + * 1: scno == cno, i.e. the current character ends at the + * screen character we care about. + * a: off < llen - 1, i.e. not the last character in + * the line, return the offset of the next character. + * b: else return the offset of the last character. + * 2: scno != cno, i.e. this character overruns the character + * we care about, return the offset of this character. + */ + if ((scno += chlen) >= cno) { + off = p - lp; + return (scno == cno ? + (off < llen - 1 ? off : llen - 1) : off - 1); + } + + TAB_RESET; + } + + /* No such character; return the start of the last character. */ + return (llen - 1); +} |