diff options
Diffstat (limited to 'lib/libcurses/newwin.c')
| -rw-r--r-- | lib/libcurses/newwin.c | 248 |
1 files changed, 248 insertions, 0 deletions
diff --git a/lib/libcurses/newwin.c b/lib/libcurses/newwin.c new file mode 100644 index 0000000..a2f577a --- /dev/null +++ b/lib/libcurses/newwin.c @@ -0,0 +1,248 @@ +/* + * Copyright (c) 1981, 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[] = "@(#)newwin.c 8.1 (Berkeley) 7/20/93"; +#endif /* not lint */ + +#include <curses.h> +#include <stdlib.h> + +#undef nl /* Don't need it here, and it interferes. */ + +static WINDOW *__makenew __P((int, int, int, int, int)); + +void __set_subwin __P((WINDOW *, WINDOW *)); + +/* + * newwin -- + * Allocate space for and set up defaults for a new window. + */ +WINDOW * +newwin(nl, nc, by, bx) + register int nl, nc, by, bx; +{ + register WINDOW *win; + register __LINE *lp; + register int i, j; + register __LDATA *sp; + + if (nl == 0) + nl = LINES - by; + if (nc == 0) + nc = COLS - bx; + + if ((win = __makenew(nl, nc, by, bx, 0)) == NULL) + return (NULL); + + win->nextp = win; + win->ch_off = 0; + win->orig = NULL; + +#ifdef DEBUG + __CTRACE("newwin: win->ch_off = %d\n", win->ch_off); +#endif + + for (i = 0; i < nl; i++) { + lp = win->lines[i]; + lp->flags = 0; + for (sp = lp->line, j = 0; j < nc; j++, sp++) { + sp->ch = ' '; + sp->attr = 0; + } + lp->hash = __hash((char *) lp->line, nc * __LDATASIZE); + } + return (win); +} + +WINDOW * +subwin(orig, nl, nc, by, bx) + register WINDOW *orig; + register int by, bx, nl, nc; +{ + int i; + __LINE *lp; + register WINDOW *win; + + /* Make sure window fits inside the original one. */ +#ifdef DEBUG + __CTRACE("subwin: (%0.2o, %d, %d, %d, %d)\n", orig, nl, nc, by, bx); +#endif + if (by < orig->begy || bx < orig->begx + || by + nl > orig->maxy + orig->begy + || bx + nc > orig->maxx + orig->begx) + return (NULL); + if (nl == 0) + nl = orig->maxy + orig->begy - by; + if (nc == 0) + nc = orig->maxx + orig->begx - bx; + if ((win = __makenew(nl, nc, by, bx, 1)) == NULL) + return (NULL); + win->nextp = orig->nextp; + orig->nextp = win; + win->orig = orig; + + /* Initialize flags here so that refresh can also use __set_subwin. */ + for (lp = win->lspace, i = 0; i < win->maxy; i++, lp++) + lp->flags = 0; + __set_subwin(orig, win); + return (win); +} + +/* + * This code is shared with mvwin(). + */ +void +__set_subwin(orig, win) + register WINDOW *orig, *win; +{ + int i; + __LINE *lp, *olp; + + win->ch_off = win->begx - orig->begx; + /* Point line pointers to line space. */ + for (lp = win->lspace, i = 0; i < win->maxy; i++, lp++) { + win->lines[i] = lp; + olp = orig->lines[i + win->begy]; + lp->line = &olp->line[win->begx]; + lp->firstchp = &olp->firstch; + lp->lastchp = &olp->lastch; + lp->hash = __hash((char *) lp->line, win->maxx * __LDATASIZE); + } + +#ifdef DEBUG + __CTRACE("__set_subwin: win->ch_off = %d\n", win->ch_off); +#endif +} + +/* + * __makenew -- + * Set up a window buffer and returns a pointer to it. + */ +static WINDOW * +__makenew(nl, nc, by, bx, sub) + register int by, bx, nl, nc; + int sub; +{ + register WINDOW *win; + register __LINE *lp; + int i; + + +#ifdef DEBUG + __CTRACE("makenew: (%d, %d, %d, %d)\n", nl, nc, by, bx); +#endif + if ((win = malloc(sizeof(*win))) == NULL) + return (NULL); +#ifdef DEBUG + __CTRACE("makenew: nl = %d\n", nl); +#endif + + /* + * Set up line pointer array and line space. + */ + if ((win->lines = malloc (nl * sizeof(__LINE *))) == NULL) { + free(win); + return NULL; + } + if ((win->lspace = malloc (nl * sizeof(__LINE))) == NULL) { + free (win); + free (win->lines); + return NULL; + } + + /* Don't allocate window and line space if it's a subwindow */ + if (!sub) { + /* + * Allocate window space in one chunk. + */ + if ((win->wspace = + malloc(nc * nl * sizeof(__LDATA))) == NULL) { + free(win->lines); + free(win->lspace); + free(win); + return NULL; + } + + /* + * Point line pointers to line space, and lines themselves into + * window space. + */ + for (lp = win->lspace, i = 0; i < nl; i++, lp++) { + win->lines[i] = lp; + lp->line = &win->wspace[i * nc]; + lp->firstchp = &lp->firstch; + lp->lastchp = &lp->lastch; + lp->firstch = 0; + lp->lastch = 0; + } + } +#ifdef DEBUG + __CTRACE("makenew: nc = %d\n", nc); +#endif + win->cury = win->curx = 0; + win->maxy = nl; + win->maxx = nc; + + win->begy = by; + win->begx = bx; + win->flags = 0; + __swflags(win); +#ifdef DEBUG + __CTRACE("makenew: win->flags = %0.2o\n", win->flags); + __CTRACE("makenew: win->maxy = %d\n", win->maxy); + __CTRACE("makenew: win->maxx = %d\n", win->maxx); + __CTRACE("makenew: win->begy = %d\n", win->begy); + __CTRACE("makenew: win->begx = %d\n", win->begx); +#endif + return (win); +} + +void +__swflags(win) + register WINDOW *win; +{ + win->flags &= + ~(__ENDLINE | __FULLLINE | __FULLWIN | __SCROLLWIN | __LEAVEOK); + if (win->begx + win->maxx == COLS) { + win->flags |= __ENDLINE; + if (win->begx == 0) { + if (AL && DL) + win->flags |= __FULLLINE; + if (win->maxy == LINES && win->begy == 0) + win->flags |= __FULLWIN; + } + if (win->begy + win->maxy == LINES) + win->flags |= __SCROLLWIN; + } +} |
