/*- * Copyright (c) 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[] = "@(#)svi_split.c 8.1 (Berkeley) 6/9/93"; #endif /* not lint */ #include <sys/types.h> #include <curses.h> #include <errno.h> #include <stdlib.h> #include <string.h> #include "vi.h" #include "svi_screen.h" /* * svi_split -- * Split the screen. Keep the cursor line on the screen, and make * reassembly easy by overallocating on the line maps and linking * from top of the real screen to the bottom. */ int svi_split(sp, ep) SCR *sp; EXF *ep; { SCR *tsp; size_t half; /* Check to see if it's possible. */ half = sp->rows / 2; if (half < MINIMUM_SCREEN_ROWS) { msgq(sp, M_ERR, "Screen not large enough to split"); return (1); } /* Get a new screen, initialize. */ if ((tsp = malloc(sizeof(SCR))) == NULL) { msgq(sp, M_ERR, "Error: %s", strerror(errno)); return (1); } if (scr_init(sp, tsp)) { free(tsp); return (1); } /* Start the file. */ if ((tsp->ep = file_start(tsp, ep, NULL)) == NULL) { free(tsp); return (1); } /* * Build a screen map for the child -- large enough to accomodate * the entire window. */ if ((tsp->h_smap = malloc(sp->w_rows * sizeof(SMAP))) == NULL) { free(tsp); return (1); } /* Split the screen, and link the screens together. */ if (sp->sc_row <= half) { /* Parent is top half. */ tsp->rows = sp->rows - half; /* Child. */ tsp->cols = sp->cols; tsp->t_rows = tsp->rows - 1; tsp->w_rows = sp->w_rows; tsp->s_off = sp->s_off + half; tsp->sc_col = tsp->sc_row = 0; tsp->t_smap = tsp->h_smap + (tsp->t_rows - 1); sp->rows = half; /* Parent. */ sp->t_rows = sp->rows - 1; sp->t_smap = sp->h_smap + (sp->t_rows - 1); tsp->child = sp->child; if (sp->child != NULL) sp->child->parent = tsp; sp->child = tsp; tsp->parent = sp; } else { /* Parent is bottom half. */ tsp->rows = sp->rows - half; /* Child. */ tsp->cols = sp->cols; tsp->t_rows = tsp->rows - 1; tsp->w_rows = sp->w_rows; tsp->s_off = sp->s_off; tsp->sc_col = tsp->sc_row = 0; tsp->t_smap = tsp->h_smap + (tsp->t_rows - 1); sp->rows = half; /* Parent. */ sp->t_rows = sp->rows - 1; sp->s_off = sp->s_off + half; sp->t_smap = sp->h_smap + (sp->t_rows - 1); tsp->parent = sp->parent; if (sp->parent != NULL) sp->parent->child = tsp; sp->parent = tsp; tsp->child = sp; } /* Init support routines. */ svi_init(tsp); /* Fill the child's screen map. */ (void)svi_sm_fill(tsp, tsp->ep, sp->lno, P_FILL); /* Clear the information lines. */ MOVE(sp, INFOLINE(sp), 0); clrtoeol(); MOVE(tsp, INFOLINE(sp), 0); clrtoeol(); /* Refresh the parent screens, displaying the status line. */ (void)status(sp, sp->ep, sp->lno, 0); (void)svi_refresh(sp, sp->ep); /* Completely redraw the child screen. */ F_SET(tsp, S_REDRAW); /* Switch screens. */ sp->snext = tsp; F_SET(sp, S_SSWITCH); return (0); }