tscroll.c revision 1.12
1 /* $NetBSD: tscroll.c,v 1.12 2003/08/07 16:44:25 agc 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 1.12 2003/08/07 16:44:25 agc 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("__parse_cap: cap = "); 99 for (i = 0; i < strlen(cap); i++) 100 __CTRACE("%s", unctrl(cap[i])); 101 __CTRACE("\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 ("__parse_cap: %%n, val = %d\n", n); 117 #endif 118 } 119 n ^= 0140; 120 continue; 121 case 'd': 122 if (!have_input) { 123 n = va_arg (ap, int); 124 have_input = 1; 125 #ifdef DEBUG 126 __CTRACE ("__parse_cap: %%d, val = %d\n", n); 127 #endif 128 } 129 if (n < 10) 130 goto one; 131 if (n < 100) 132 goto two; 133 /* FALLTHROUGH */ 134 case '3': 135 if (!have_input) { 136 n = va_arg (ap, int); 137 have_input = 1; 138 #ifdef DEBUG 139 __CTRACE ("__parse_cap: %%3, val = %d\n", n); 140 #endif 141 } 142 *dp++ = (n / 100) | '0'; 143 n %= 100; 144 /* FALLTHROUGH */ 145 case '2': 146 if (!have_input) { 147 n = va_arg (ap, int); 148 have_input = 1; 149 #ifdef DEBUG 150 __CTRACE ("__parse_cap: %%2, val = %d\n", n); 151 #endif 152 } 153 two: *dp++ = n / 10 | '0'; 154 one: *dp++ = n % 10 | '0'; 155 have_input = 0; 156 continue; 157 case '>': 158 if (!have_input) { 159 n = va_arg (ap, int); 160 have_input = 1; 161 #ifdef DEBUG 162 __CTRACE ("__parse_cap: %%>, val = %d\n", n); 163 #endif 164 } 165 if (n > *cap++) 166 n += *cap++; 167 else 168 cap++; 169 continue; 170 case '+': 171 if (!have_input) { 172 n = va_arg (ap, int); 173 have_input = 1; 174 #ifdef DEBUG 175 __CTRACE ("__parse_cap: %%+, val = %d\n", n); 176 #endif 177 } 178 n += *cap++; 179 /* FALLTHROUGH */ 180 case '.': 181 if (!have_input) { 182 n = va_arg (ap, int); 183 have_input = 1; 184 #ifdef DEBUG 185 __CTRACE ("__parse_cap: %%., val = %d\n", n); 186 #endif 187 } 188 *dp++ = n; 189 have_input = 0; 190 continue; 191 case 'i': 192 if (!have_input) { 193 n = va_arg (ap, int); 194 have_input = 1; 195 #ifdef DEBUG 196 __CTRACE ("__parse_cap: %%i, val = %d\n", n); 197 #endif 198 } 199 n++; 200 continue; 201 case '%': 202 *dp++ = c; 203 continue; 204 case 'B': 205 if (!have_input) { 206 n = va_arg (ap, int); 207 have_input = 1; 208 #ifdef DEBUG 209 __CTRACE ("__parse_cap: %%B, val = %d\n", n); 210 #endif 211 } 212 n = (n / 10 << 4) + n % 10; 213 continue; 214 case 'D': 215 if (!have_input) { 216 n = va_arg (ap, int); 217 have_input = 1; 218 #ifdef DEBUG 219 __CTRACE ("__parse_cap: %%D, val = %d\n", n); 220 #endif 221 } 222 n = n - 2 * (n % 16); 223 continue; 224 /* 225 * XXX 226 * System V terminfo files have lots of extra gunk. 227 * The only other one we've seen in capability strings 228 * is %pN, and it seems to work okay if we ignore it. 229 */ 230 case 'p': 231 ++cap; 232 continue; 233 default: 234 goto err; 235 } 236 } 237 *dp = '\0'; 238 va_end (ap); 239 return (result); 240 241 err: va_end (ap); 242 return ((char *) "\0"); 243 } 244
Indexes created Tue Sep 23 07:09:52 GMT 2025