1 /*- 2 * Copyright (c) 1992, 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[] = "@(#)tscroll.c 8.1 (Berkeley) 6/4/93"; */ 36 static char *rcsid = "$Id: tscroll.c,v 1.2 1993/11/09 04:08:54 cgd Exp $"; 37 #endif /* not lint */ 38 39 #include <curses.h> 40 41 #define MAXRETURNSIZE 64 42 43 /* 44 * Routine to perform scrolling. Derived from tgoto.c in tercamp(3) library. 45 * Cap is a string containing printf type escapes to allow 46 * scrolling. 47 * The following escapes are defined for substituting n: 48 * 49 * %d as in printf 50 * %2 like %2d 51 * %3 like %3d 52 * %. gives %c hacking special case characters 53 * %+x like %c but adding x first 54 * 55 * The codes below affect the state but don't use up a value. 56 * 57 * %>xy if value > x add y 58 * %i increments n 59 * %% gives % 60 * %B BCD (2 decimal digits encoded in one byte) 61 * %D Delta Data (backwards bcd) 62 * 63 * all other characters are ``self-inserting''. 64 */ 65 char * 66 __tscroll(cap, n) 67 const char *cap; 68 int n; 69 { 70 static char result[MAXRETURNSIZE]; 71 register char *dp; 72 register int c; 73 char *cp; 74 75 if (cap == NULL) { 76 toohard: 77 /* 78 * ``We don't do that under BOZO's big top'' 79 */ 80 return ("OOPS"); 81 } 82 83 cp = (char *) cap; 84 dp = result; 85 while (c = *cp++) { 86 if (c != '%') { 87 *dp++ = c; 88 continue; 89 } 90 switch (c = *cp++) { 91 case 'n': 92 n ^= 0140; 93 continue; 94 case 'd': 95 if (n < 10) 96 goto one; 97 if (n < 100) 98 goto two; 99 /* fall into... */ 100 case '3': 101 *dp++ = (n / 100) | '0'; 102 n %= 100; 103 /* fall into... */ 104 case '2': 105 two: 106 *dp++ = n / 10 | '0'; 107 one: 108 *dp++ = n % 10 | '0'; 109 continue; 110 case '>': 111 if (n > *cp++) 112 n += *cp++; 113 else 114 cp++; 115 continue; 116 case '+': 117 n += *cp++; 118 /* fall into... */ 119 case '.': 120 *dp++ = n; 121 continue; 122 case 'i': 123 n++; 124 continue; 125 case '%': 126 *dp++ = c; 127 continue; 128 129 case 'B': 130 n = (n / 10 << 4) + n % 10; 131 continue; 132 case 'D': 133 n = n - 2 * (n % 16); 134 continue; 135 default: 136 goto toohard; 137 } 138 } 139 *dp = '\0'; 140 return (result); 141 } 142