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Diffstat (limited to 'usr.bin/more/position.c')
| -rw-r--r-- | usr.bin/more/position.c | 163 |
1 files changed, 0 insertions, 163 deletions
diff --git a/usr.bin/more/position.c b/usr.bin/more/position.c deleted file mode 100644 index 8564be0..0000000 --- a/usr.bin/more/position.c +++ /dev/null @@ -1,163 +0,0 @@ -/* - * Copyright (c) 1988 Mark Nudleman - * Copyright (c) 1988, 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[] = "@(#)position.c 8.1 (Berkeley) 6/6/93"; -#endif /* not lint */ - -/* - * Routines dealing with the "position" table. - * This is a table which tells the position (in the input file) of the - * first char on each currently displayed line. - * - * {{ The position table is scrolled by moving all the entries. - * Would be better to have a circular table - * and just change a couple of pointers. }} - */ - -#include <sys/types.h> -#include <less.h> - -static off_t *table; /* The position table */ -static int tablesize; - -extern int sc_height; - -/* - * Return the starting file position of a line displayed on the screen. - * The line may be specified as a line number relative to the top - * of the screen, but is usually one of these special cases: - * the top (first) line on the screen - * the second line on the screen - * the bottom line on the screen - * the line after the bottom line on the screen - */ -off_t -position(where) - int where; -{ - switch (where) - { - case BOTTOM: - where = sc_height - 2; - break; - case BOTTOM_PLUS_ONE: - where = sc_height - 1; - break; - case MIDDLE: - where = sc_height / 2; - } - return (table[where]); -} - -/* - * Add a new file position to the bottom of the position table. - */ -add_forw_pos(pos) - off_t pos; -{ - register int i; - - /* - * Scroll the position table up. - */ - for (i = 1; i < sc_height; i++) - table[i-1] = table[i]; - table[sc_height - 1] = pos; -} - -/* - * Add a new file position to the top of the position table. - */ -add_back_pos(pos) - off_t pos; -{ - register int i; - - /* - * Scroll the position table down. - */ - for (i = sc_height - 1; i > 0; i--) - table[i] = table[i-1]; - table[0] = pos; -} - -copytable() -{ - register int a, b; - - for (a = 0; a < sc_height && table[a] == NULL_POSITION; a++); - for (b = 0; a < sc_height; a++, b++) { - table[b] = table[a]; - table[a] = NULL_POSITION; - } -} - -/* - * Initialize the position table, done whenever we clear the screen. - */ -pos_clear() -{ - register int i; - extern char *malloc(), *realloc(); - - if (table == 0) { - tablesize = sc_height > 25 ? sc_height : 25; - table = (off_t *)malloc(tablesize * sizeof *table); - } else if (sc_height >= tablesize) { - tablesize = sc_height; - table = (off_t *)realloc(table, tablesize * sizeof *table); - } - - for (i = 0; i < sc_height; i++) - table[i] = NULL_POSITION; -} - -/* - * See if the byte at a specified position is currently on the screen. - * Check the position table to see if the position falls within its range. - * Return the position table entry if found, -1 if not. - */ -onscreen(pos) - off_t pos; -{ - register int i; - - if (pos < table[0]) - return (-1); - for (i = 1; i < sc_height; i++) - if (pos < table[i]) - return (i-1); - return (-1); -} |
