diff options
Diffstat (limited to 'vi/v_z.c')
| -rw-r--r-- | vi/v_z.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/vi/v_z.c b/vi/v_z.c new file mode 100644 index 000000000000..5f02ddf5a10b --- /dev/null +++ b/vi/v_z.c @@ -0,0 +1,149 @@ +/*- + * Copyright (c) 1992, 1993, 1994 + * The Regents of the University of California. All rights reserved. + * Copyright (c) 1992, 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[] = "@(#)v_z.c 10.10 (Berkeley) 5/16/96"; +#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 "../common/common.h" +#include "vi.h" + +/* + * v_z -- [count]z[count][-.+^<CR>] + * Move the screen. + * + * PUBLIC: int v_z __P((SCR *, VICMD *)); + */ +int +v_z(sp, vp) + SCR *sp; + VICMD *vp; +{ + recno_t 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 (!db_exist(sp, lno) && db_last(sp, &lno)) + return (1); + } else + lno = vp->m_start.lno; + + /* Set default return cursor line. */ + vp->m_final.lno = lno; + vp->m_final.cno = vp->m_start.cno; + + /* + * The second count is the displayed window size, i.e. the 'z' command + * is another way to get artificially small windows. Note, you can't + * grow beyond the size of the window. + * + * !!! + * A window size of 0 was historically allowed, and simply ignored. + * 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) { + if (vp->count2 > O_VAL(sp, O_WINDOW)) + vp->count2 = O_VAL(sp, O_WINDOW); + if (vs_crel(sp, vp->count2)) + return (1); + } + + switch (vp->character) { + case '-': /* Put the line at the bottom. */ + if (vs_sm_fill(sp, lno, P_BOTTOM)) + return (1); + break; + case '.': /* Put the line in the middle. */ + if (vs_sm_fill(sp, lno, P_MIDDLE)) + return (1); + break; + case '+': + /* + * If the user specified a line number, put that line at the + * top and move the cursor to it. Otherwise, scroll forward + * a screen from the current screen. + */ + if (F_ISSET(vp, VC_C1SET)) { + if (vs_sm_fill(sp, lno, P_TOP)) + return (1); + if (vs_sm_position(sp, &vp->m_final, 0, P_TOP)) + return (1); + } else + if (vs_sm_scroll(sp, &vp->m_final, sp->t_rows, Z_PLUS)) + return (1); + break; + case '^': + /* + * If the user specified a line number, put that line at the + * bottom, move the cursor to it, and then display the screen + * before that one. Otherwise, scroll backward a screen from + * the current screen. + * + * !!! + * Note, we match the off-by-one characteristics of historic + * vi, here. + */ + if (F_ISSET(vp, VC_C1SET)) { + if (vs_sm_fill(sp, lno, P_BOTTOM)) + return (1); + if (vs_sm_position(sp, &vp->m_final, 0, P_TOP)) + return (1); + if (vs_sm_fill(sp, vp->m_final.lno, P_BOTTOM)) + return (1); + } else + if (vs_sm_scroll(sp, &vp->m_final, sp->t_rows, Z_CARAT)) + return (1); + break; + default: /* Put the line at the top for <cr>. */ + value = KEY_VAL(sp, vp->character); + if (value != K_CR && value != K_NL) { + v_emsg(sp, vp->kp->usage, VIM_USAGE); + return (1); + } + if (vs_sm_fill(sp, lno, P_TOP)) + return (1); + break; + } + return (0); +} + +/* + * vs_crel -- + * Change the relative size of the current screen. + * + * PUBLIC: int vs_crel __P((SCR *, long)); + */ +int +vs_crel(sp, count) + SCR *sp; + long count; +{ + sp->t_minrows = sp->t_rows = count; + if (sp->t_rows > sp->rows - 1) + sp->t_minrows = sp->t_rows = sp->rows - 1; + TMAP = HMAP + (sp->t_rows - 1); + F_SET(sp, SC_SCR_REDRAW); + return (0); +} |