1 /*- 2 * Copyright (c) 1992, 1993, 1994 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 static char sccsid[] = "@(#)tscroll.c 8.4 (Berkeley) 7/27/94"; 36 #endif /* not lint */ 37 38 #include "curses.h" 39 40 #define MAXRETURNSIZE 64 41 42 /* 43 * Routine to perform scrolling. Derived from tgoto.c in tercamp(3) 44 * library. Cap is a string containing printf type escapes to allow 45 * scrolling. The following escapes are defined for substituting n: 46 * 47 * %d as in printf 48 * %2 like %2d 49 * %3 like %3d 50 * %. gives %c hacking special case characters 51 * %+x like %c but adding x first 52 * 53 * The codes below affect the state but don't use up a value. 54 * 55 * %>xy if value > x add y 56 * %i increments n 57 * %% gives % 58 * %B BCD (2 decimal digits encoded in one byte) 59 * %D Delta Data (backwards bcd) 60 * 61 * all other characters are ``self-inserting''. 62 */ 63 char * 64 __tscroll(cap, n1, n2) 65 const char *cap; 66 int n1, n2; 67 { 68 static char result[MAXRETURNSIZE]; 69 int c, n; 70 char *dp; 71 72 if (cap == NULL) 73 goto err; 74 for (n = n1, dp = result; (c = *cap++) != '\0';) { 75 if (c != '%') { 76 *dp++ = c; 77 continue; 78 } 79 switch (c = *cap++) { 80 case 'n': 81 n ^= 0140; 82 continue; 83 case 'd': 84 if (n < 10) 85 goto one; 86 if (n < 100) 87 goto two; 88 /* FALLTHROUGH */ 89 case '3': 90 *dp++ = (n / 100) | '0'; 91 n %= 100; 92 /* FALLTHROUGH */ 93 case '2': 94 two: *dp++ = n / 10 | '0'; 95 one: *dp++ = n % 10 | '0'; 96 n = n2; 97 continue; 98 case '>': 99 if (n > *cap++) 100 n += *cap++; 101 else 102 cap++; 103 continue; 104 case '+': 105 n += *cap++; 106 /* FALLTHROUGH */ 107 case '.': 108 *dp++ = n; 109 continue; 110 case 'i': 111 n++; 112 continue; 113 case '%': 114 *dp++ = c; 115 continue; 116 case 'B': 117 n = (n / 10 << 4) + n % 10; 118 continue; 119 case 'D': 120 n = n - 2 * (n % 16); 121 continue; 122 /* 123 * XXX 124 * System V terminfo files have lots of extra gunk. 125 * The only one we've seen in scrolling strings is 126 * %pN, and it seems to work okay if we ignore it. 127 */ 128 case 'p': 129 ++cap; 130 continue; 131 default: 132 goto err; 133 } 134 } 135 *dp = '\0'; 136 return (result); 137 138 err: return("curses: __tscroll failed"); 139 } 140