1 /* 2 * Copyright (c) 1981, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 /* from: static char sccsid[] = "@(#)newwin.c 8.1 (Berkeley) 7/20/93"; */ 36 static char *rcsid = "$Id: newwin.c,v 1.6 1993/11/09 04:08:22 cgd Exp $"; 37 #endif /* not lint */ 38 39 #include <curses.h> 40 #include <stdlib.h> 41 42 #undef nl /* Don't need it here, and it interferes. */ 43 44 static WINDOW *__makenew __P((int, int, int, int, int)); 45 46 void __set_subwin __P((WINDOW *, WINDOW *)); 47 48 /* 49 * newwin -- 50 * Allocate space for and set up defaults for a new window. 51 */ 52 WINDOW * 53 newwin(nl, nc, by, bx) 54 register int nl, nc, by, bx; 55 { 56 register WINDOW *win; 57 register __LINE *lp; 58 register int i, j; 59 register __LDATA *sp; 60 61 if (nl == 0) 62 nl = LINES - by; 63 if (nc == 0) 64 nc = COLS - bx; 65 66 if ((win = __makenew(nl, nc, by, bx, 0)) == NULL) 67 return (NULL); 68 69 win->nextp = win; 70 win->ch_off = 0; 71 win->orig = NULL; 72 73 #ifdef DEBUG 74 __CTRACE("newwin: win->ch_off = %d\n", win->ch_off); 75 #endif 76 77 for (i = 0; i < nl; i++) { 78 lp = win->lines[i]; 79 lp->flags = 0; 80 for (sp = lp->line, j = 0; j < nc; j++, sp++) { 81 sp->ch = ' '; 82 sp->attr = 0; 83 } 84 lp->hash = __hash((char *) lp->line, nc * __LDATASIZE); 85 } 86 return (win); 87 } 88 89 WINDOW * 90 subwin(orig, nl, nc, by, bx) 91 register WINDOW *orig; 92 register int by, bx, nl, nc; 93 { 94 int i; 95 __LINE *lp; 96 register WINDOW *win; 97 98 /* Make sure window fits inside the original one. */ 99 #ifdef DEBUG 100 __CTRACE("subwin: (%0.2o, %d, %d, %d, %d)\n", orig, nl, nc, by, bx); 101 #endif 102 if (by < orig->begy || bx < orig->begx 103 || by + nl > orig->maxy + orig->begy 104 || bx + nc > orig->maxx + orig->begx) 105 return (NULL); 106 if (nl == 0) 107 nl = orig->maxy + orig->begy - by; 108 if (nc == 0) 109 nc = orig->maxx + orig->begx - bx; 110 if ((win = __makenew(nl, nc, by, bx, 1)) == NULL) 111 return (NULL); 112 win->nextp = orig->nextp; 113 orig->nextp = win; 114 win->orig = orig; 115 116 /* Initialize flags here so that refresh can also use __set_subwin. */ 117 for (lp = win->lspace, i = 0; i < win->maxy; i++, lp++) 118 lp->flags = 0; 119 __set_subwin(orig, win); 120 return (win); 121 } 122 123 /* 124 * This code is shared with mvwin(). 125 */ 126 void 127 __set_subwin(orig, win) 128 register WINDOW *orig, *win; 129 { 130 int i; 131 __LINE *lp, *olp; 132 133 win->ch_off = win->begx - orig->begx; 134 /* Point line pointers to line space. */ 135 for (lp = win->lspace, i = 0; i < win->maxy; i++, lp++) { 136 win->lines[i] = lp; 137 olp = orig->lines[i + win->begy]; 138 lp->line = &olp->line[win->begx]; 139 lp->firstchp = &olp->firstch; 140 lp->lastchp = &olp->lastch; 141 lp->hash = __hash((char *) lp->line, win->maxx * __LDATASIZE); 142 } 143 144 #ifdef DEBUG 145 __CTRACE("__set_subwin: win->ch_off = %d\n", win->ch_off); 146 #endif 147 } 148 149 /* 150 * __makenew -- 151 * Set up a window buffer and returns a pointer to it. 152 */ 153 static WINDOW * 154 __makenew(nl, nc, by, bx, sub) 155 register int by, bx, nl, nc; 156 int sub; 157 { 158 register WINDOW *win; 159 register __LINE *lp; 160 int i; 161 162 163 #ifdef DEBUG 164 __CTRACE("makenew: (%d, %d, %d, %d)\n", nl, nc, by, bx); 165 #endif 166 if ((win = malloc(sizeof(*win))) == NULL) 167 return (NULL); 168 #ifdef DEBUG 169 __CTRACE("makenew: nl = %d\n", nl); 170 #endif 171 172 /* 173 * Set up line pointer array and line space. 174 */ 175 if ((win->lines = malloc (nl * sizeof(__LINE *))) == NULL) { 176 free(win); 177 return NULL; 178 } 179 if ((win->lspace = malloc (nl * sizeof(__LINE))) == NULL) { 180 free (win); 181 free (win->lines); 182 return NULL; 183 } 184 185 /* Don't allocate window and line space if it's a subwindow */ 186 if (!sub) { 187 /* 188 * Allocate window space in one chunk. 189 */ 190 if ((win->wspace = 191 malloc(nc * nl * sizeof(__LDATA))) == NULL) { 192 free(win->lines); 193 free(win->lspace); 194 free(win); 195 return NULL; 196 } 197 198 /* 199 * Point line pointers to line space, and lines themselves into 200 * window space. 201 */ 202 for (lp = win->lspace, i = 0; i < nl; i++, lp++) { 203 win->lines[i] = lp; 204 lp->line = &win->wspace[i * nc]; 205 lp->firstchp = &lp->firstch; 206 lp->lastchp = &lp->lastch; 207 lp->firstch = 0; 208 lp->lastch = 0; 209 } 210 } 211 #ifdef DEBUG 212 __CTRACE("makenew: nc = %d\n", nc); 213 #endif 214 win->cury = win->curx = 0; 215 win->maxy = nl; 216 win->maxx = nc; 217 218 win->begy = by; 219 win->begx = bx; 220 win->flags = 0; 221 __swflags(win); 222 #ifdef DEBUG 223 __CTRACE("makenew: win->flags = %0.2o\n", win->flags); 224 __CTRACE("makenew: win->maxy = %d\n", win->maxy); 225 __CTRACE("makenew: win->maxx = %d\n", win->maxx); 226 __CTRACE("makenew: win->begy = %d\n", win->begy); 227 __CTRACE("makenew: win->begx = %d\n", win->begx); 228 #endif 229 return (win); 230 } 231 232 void 233 __swflags(win) 234 register WINDOW *win; 235 { 236 win->flags &= 237 ~(__ENDLINE | __FULLLINE | __FULLWIN | __SCROLLWIN | __LEAVEOK); 238 if (win->begx + win->maxx == COLS) { 239 win->flags |= __ENDLINE; 240 if (win->begx == 0) { 241 if (AL && DL) 242 win->flags |= __FULLLINE; 243 if (win->maxy == LINES && win->begy == 0) 244 win->flags |= __FULLWIN; 245 } 246 if (win->begy + win->maxy == LINES) 247 win->flags |= __SCROLLWIN; 248 } 249 } 250