1 /* $NetBSD: tscroll.c,v 1.10 2002/05/26 17:01:38 wiz Exp $ */ 2 3 /*- 4 * Copyright (c) 1992, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #include <stdarg.h> 38 39 #ifndef lint 40 #if 0 41 static char sccsid[] = "@(#)tscroll.c 8.4 (Berkeley) 7/27/94"; 42 #else 43 __RCSID("$NetBSD: tscroll.c,v 1.10 2002/05/26 17:01:38 wiz Exp $"); 44 #endif 45 #endif /* not lint */ 46 47 #include "curses.h" 48 #include "curses_private.h" 49 50 #define MAXRETURNSIZE 64 51 52 char * 53 __tscroll(const char *cap, int n1, int n2) 54 { 55 return (__parse_cap(cap, n1, n2)); 56 } 57 58 /* 59 * Routines to parse capabilities. Derived from tgoto.c in termcap(3) 60 * library. Cap is a string containing printf type escapes to allow 61 * scrolling. The following escapes are defined for substituting n: 62 * 63 * %d as in printf 64 * %2 like %2d 65 * %3 like %3d 66 * %. gives %c hacking special case characters 67 * %+x like %c but adding x first 68 * 69 * The codes below affect the state but don't use up a value. 70 * 71 * %>xy if value > x add y 72 * %i increments n 73 * %% gives % 74 * %B BCD (2 decimal digits encoded in one byte) 75 * %D Delta Data (backwards bcd) 76 * 77 * all other characters are ``self-inserting''. 78 * 79 * XXX: 80 * %r reverse order of two parameters 81 * is also defined but we don't support it (yet). 82 */ 83 char * 84 __parse_cap (char const *cap, ...) 85 { 86 va_list ap; 87 static char result[MAXRETURNSIZE]; 88 int c, n; 89 char *dp; 90 int have_input; 91 92 va_start (ap, cap); 93 n = 0; /* XXX gcc -Wuninitialized */ 94 95 if (cap == NULL) 96 goto err; 97 #ifdef DEBUG 98 { 99 int i; 100 101 __CTRACE("__parse_cap: cap = "); 102 for (i = 0; i < strlen(cap); i++) 103 __CTRACE("%s", unctrl(cap[i])); 104 __CTRACE("\n"); 105 } 106 #endif 107 have_input = 0; 108 for (dp = result; (c = *cap++) != '\0';) { 109 if (c != '%') { 110 *dp++ = c; 111 continue; 112 } 113 switch (c = *cap++) { 114 case 'n': 115 if (!have_input) { 116 n = va_arg (ap, int); 117 have_input = 1; 118 #ifdef DEBUG 119 __CTRACE ("__parse_cap: %%n, val = %d\n", n); 120 #endif 121 } 122 n ^= 0140; 123 continue; 124 case 'd': 125 if (!have_input) { 126 n = va_arg (ap, int); 127 have_input = 1; 128 #ifdef DEBUG 129 __CTRACE ("__parse_cap: %%d, val = %d\n", n); 130 #endif 131 } 132 if (n < 10) 133 goto one; 134 if (n < 100) 135 goto two; 136 /* FALLTHROUGH */ 137 case '3': 138 if (!have_input) { 139 n = va_arg (ap, int); 140 have_input = 1; 141 #ifdef DEBUG 142 __CTRACE ("__parse_cap: %%3, val = %d\n", n); 143 #endif 144 } 145 *dp++ = (n / 100) | '0'; 146 n %= 100; 147 /* FALLTHROUGH */ 148 case '2': 149 if (!have_input) { 150 n = va_arg (ap, int); 151 have_input = 1; 152 #ifdef DEBUG 153 __CTRACE ("__parse_cap: %%2, val = %d\n", n); 154 #endif 155 } 156 two: *dp++ = n / 10 | '0'; 157 one: *dp++ = n % 10 | '0'; 158 have_input = 0; 159 continue; 160 case '>': 161 if (!have_input) { 162 n = va_arg (ap, int); 163 have_input = 1; 164 #ifdef DEBUG 165 __CTRACE ("__parse_cap: %%>, val = %d\n", n); 166 #endif 167 } 168 if (n > *cap++) 169 n += *cap++; 170 else 171 cap++; 172 continue; 173 case '+': 174 if (!have_input) { 175 n = va_arg (ap, int); 176 have_input = 1; 177 #ifdef DEBUG 178 __CTRACE ("__parse_cap: %%+, val = %d\n", n); 179 #endif 180 } 181 n += *cap++; 182 /* FALLTHROUGH */ 183 case '.': 184 if (!have_input) { 185 n = va_arg (ap, int); 186 have_input = 1; 187 #ifdef DEBUG 188 __CTRACE ("__parse_cap: %%., val = %d\n", n); 189 #endif 190 } 191 *dp++ = n; 192 have_input = 0; 193 continue; 194 case 'i': 195 if (!have_input) { 196 n = va_arg (ap, int); 197 have_input = 1; 198 #ifdef DEBUG 199 __CTRACE ("__parse_cap: %%i, val = %d\n", n); 200 #endif 201 } 202 n++; 203 continue; 204 case '%': 205 *dp++ = c; 206 continue; 207 case 'B': 208 if (!have_input) { 209 n = va_arg (ap, int); 210 have_input = 1; 211 #ifdef DEBUG 212 __CTRACE ("__parse_cap: %%B, val = %d\n", n); 213 #endif 214 } 215 n = (n / 10 << 4) + n % 10; 216 continue; 217 case 'D': 218 if (!have_input) { 219 n = va_arg (ap, int); 220 have_input = 1; 221 #ifdef DEBUG 222 __CTRACE ("__parse_cap: %%D, val = %d\n", n); 223 #endif 224 } 225 n = n - 2 * (n % 16); 226 continue; 227 /* 228 * XXX 229 * System V terminfo files have lots of extra gunk. 230 * The only other one we've seen in capability strings 231 * is %pN, and it seems to work okay if we ignore it. 232 */ 233 case 'p': 234 ++cap; 235 continue; 236 default: 237 goto err; 238 } 239 } 240 *dp = '\0'; 241 va_end (ap); 242 return (result); 243 244 err: va_end (ap); 245 return ((char *) "\0"); 246 } 247