1 /* $NetBSD: tscroll.c,v 1.13 2007/01/21 13:25:36 jdc 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 34 #ifndef lint 35 #if 0 36 static char sccsid[] = "@(#)tscroll.c 8.4 (Berkeley) 7/27/94"; 37 #else 38 __RCSID("$NetBSD: tscroll.c,v 1.13 2007/01/21 13:25:36 jdc Exp $"); 39 #endif 40 #endif /* not lint */ 41 42 #include <string.h> 43 #include <stdarg.h> 44 #include "curses.h" 45 #include "curses_private.h" 46 47 #define MAXRETURNSIZE 64 48 49 char * 50 __tscroll(const char *cap, int n1, int n2) 51 { 52 return (__parse_cap(cap, n1, n2)); 53 } 54 55 /* 56 * Routines to parse capabilities. Derived from tgoto.c in termcap(3) 57 * library. Cap is a string containing printf type escapes to allow 58 * scrolling. The following escapes are defined for substituting n: 59 * 60 * %d as in printf 61 * %2 like %2d 62 * %3 like %3d 63 * %. gives %c hacking special case characters 64 * %+x like %c but adding x first 65 * 66 * The codes below affect the state but don't use up a value. 67 * 68 * %>xy if value > x add y 69 * %i increments n 70 * %% gives % 71 * %B BCD (2 decimal digits encoded in one byte) 72 * %D Delta Data (backwards bcd) 73 * 74 * all other characters are ``self-inserting''. 75 * 76 * XXX: 77 * %r reverse order of two parameters 78 * is also defined but we don't support it (yet). 79 */ 80 char * 81 __parse_cap (char const *cap, ...) 82 { 83 va_list ap; 84 static char result[MAXRETURNSIZE]; 85 int c, n; 86 char *dp; 87 int have_input; 88 89 va_start (ap, cap); 90 n = 0; /* XXX gcc -Wuninitialized */ 91 92 if (cap == NULL) 93 goto err; 94 #ifdef DEBUG 95 { 96 int i; 97 98 __CTRACE(__CTRACE_MISC, "__parse_cap: cap = "); 99 for (i = 0; i < strlen(cap); i++) 100 __CTRACE(__CTRACE_MISC, "%s", unctrl(cap[i])); 101 __CTRACE(__CTRACE_MISC, "\n"); 102 } 103 #endif 104 have_input = 0; 105 for (dp = result; (c = *cap++) != '\0';) { 106 if (c != '%') { 107 *dp++ = c; 108 continue; 109 } 110 switch (c = *cap++) { 111 case 'n': 112 if (!have_input) { 113 n = va_arg (ap, int); 114 have_input = 1; 115 #ifdef DEBUG 116 __CTRACE(__CTRACE_MISC, 117 "__parse_cap: %%n, val = %d\n", n); 118 #endif 119 } 120 n ^= 0140; 121 continue; 122 case 'd': 123 if (!have_input) { 124 n = va_arg (ap, int); 125 have_input = 1; 126 #ifdef DEBUG 127 __CTRACE(__CTRACE_MISC, 128 "__parse_cap: %%d, val = %d\n", n); 129 #endif 130 } 131 if (n < 10) 132 goto one; 133 if (n < 100) 134 goto two; 135 /* FALLTHROUGH */ 136 case '3': 137 if (!have_input) { 138 n = va_arg (ap, int); 139 have_input = 1; 140 #ifdef DEBUG 141 __CTRACE(__CTRACE_MISC, 142 "__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(__CTRACE_MISC, 154 "__parse_cap: %%2, val = %d\n", n); 155 #endif 156 } 157 two: *dp++ = n / 10 | '0'; 158 one: *dp++ = n % 10 | '0'; 159 have_input = 0; 160 continue; 161 case '>': 162 if (!have_input) { 163 n = va_arg (ap, int); 164 have_input = 1; 165 #ifdef DEBUG 166 __CTRACE(__CTRACE_MISC, 167 "__parse_cap: %%>, val = %d\n", n); 168 #endif 169 } 170 if (n > *cap++) 171 n += *cap++; 172 else 173 cap++; 174 continue; 175 case '+': 176 if (!have_input) { 177 n = va_arg (ap, int); 178 have_input = 1; 179 #ifdef DEBUG 180 __CTRACE(__CTRACE_MISC, 181 "__parse_cap: %%+, val = %d\n", n); 182 #endif 183 } 184 n += *cap++; 185 /* FALLTHROUGH */ 186 case '.': 187 if (!have_input) { 188 n = va_arg (ap, int); 189 have_input = 1; 190 #ifdef DEBUG 191 __CTRACE(__CTRACE_MISC, 192 "__parse_cap: %%., val = %d\n", n); 193 #endif 194 } 195 *dp++ = n; 196 have_input = 0; 197 continue; 198 case 'i': 199 if (!have_input) { 200 n = va_arg (ap, int); 201 have_input = 1; 202 #ifdef DEBUG 203 __CTRACE(__CTRACE_MISC, 204 "__parse_cap: %%i, val = %d\n", n); 205 #endif 206 } 207 n++; 208 continue; 209 case '%': 210 *dp++ = c; 211 continue; 212 case 'B': 213 if (!have_input) { 214 n = va_arg (ap, int); 215 have_input = 1; 216 #ifdef DEBUG 217 __CTRACE(__CTRACE_MISC, 218 "__parse_cap: %%B, val = %d\n", n); 219 #endif 220 } 221 n = (n / 10 << 4) + n % 10; 222 continue; 223 case 'D': 224 if (!have_input) { 225 n = va_arg (ap, int); 226 have_input = 1; 227 #ifdef DEBUG 228 __CTRACE(__CTRACE_MISC, 229 "__parse_cap: %%D, val = %d\n", n); 230 #endif 231 } 232 n = n - 2 * (n % 16); 233 continue; 234 /* 235 * XXX 236 * System V terminfo files have lots of extra gunk. 237 * The only other one we've seen in capability strings 238 * is %pN, and it seems to work okay if we ignore it. 239 */ 240 case 'p': 241 ++cap; 242 continue; 243 default: 244 goto err; 245 } 246 } 247 *dp = '\0'; 248 va_end (ap); 249 return (result); 250 251 err: va_end (ap); 252 return ((char *) "\0"); 253 } 254