diff options
Diffstat (limited to 'usr.bin/vi/nvi/v_z.c')
| -rw-r--r-- | usr.bin/vi/nvi/v_z.c | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/usr.bin/vi/nvi/v_z.c b/usr.bin/vi/nvi/v_z.c new file mode 100644 index 000000000000..31937ffc951c --- /dev/null +++ b/usr.bin/vi/nvi/v_z.c @@ -0,0 +1,133 @@ +/*- + * 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_z.c 8.8 (Berkeley) 12/2/93"; +#endif /* not lint */ + +#include <sys/types.h> + +#include "vi.h" +#include "vcmd.h" + +/* + * v_z -- [count]z[count][-.+^<CR>] + * Move the screen. + */ +int +v_z(sp, ep, vp, fm, tm, rp) + SCR *sp; + EXF *ep; + VICMDARG *vp; + MARK *fm, *tm, *rp; +{ + recno_t last, lno; + u_int value; + + /* + * The first count is the line to use. If the value doesn't + * exist, use the last line. + */ + if (F_ISSET(vp, VC_C1SET)) { + lno = vp->count; + if (file_lline(sp, ep, &last)) + return (1); + if (lno > last) + lno = last; + } else + lno = fm->lno; + + /* Set return cursor values. */ + rp->lno = lno; + rp->cno = fm->cno; + + /* + * The second count is the displayed window size, i.e. the 'z' + * command is another way to get artificially small windows. + * + * !!! + * A window size of 0 was historically allowed, and simply ignored. + * Also, this could be much more simply done by modifying the value + * of the O_WINDOW option, but that's not how it worked historically. + */ + if (F_ISSET(vp, VC_C2SET) && + vp->count2 != 0 && sp->s_rrel(sp, vp->count2)) + return (1); + + switch (vp->character) { + case '-': /* Put the line at the bottom. */ + if (sp->s_fill(sp, ep, lno, P_BOTTOM)) + return (1); + break; + case '.': /* Put the line in the middle. */ + if (sp->s_fill(sp, ep, lno, P_MIDDLE)) + return (1); + break; + default: /* Put the line at the top for <cr>. */ + value = term_key_val(sp, vp->character); + if (value != K_CR && value != K_NL) { + msgq(sp, M_ERR, "usage: %s.", vp->kp->usage); + return (1); + } + /* FALLTHROUGH */ + case '+': /* Put the line at the top. */ + if (sp->s_fill(sp, ep, lno, P_TOP)) + return (1); + break; + case '^': /* Print the screen before the z- screen. */ + /* + * !!! + * Historic practice isn't real clear on this one. It seems + * that the command "70z^" is the same as ":70<cr>z-z^" with + * an off-by-one difference. So, until I find documentation + * to the contrary, the z^ command in this implementation + * displays the screen immediately before the current one. + * Fill the screen with the selected line at the bottom, then, + * scroll the screen down a page, and move to the middle line + * of the screen. Historic vi moved the cursor to some random + * place in the screen, as far as I can tell. + */ + if (sp->s_fill(sp, ep, lno, P_BOTTOM)) + return (1); + if (sp->s_down(sp, ep, rp, sp->t_maxrows - 1, 1)) + return (1); + if (sp->s_position(sp, ep, rp, 0, P_MIDDLE)) + return (1); + break; + } + + /* If the map changes, have to redraw the entire screen. */ + F_SET(sp, S_REDRAW); + + return (0); +} |