tscroll.c revision 1.9
1 /* $NetBSD: tscroll.c,v 1.9 2000/04/27 00:27:56 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. 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 1.9 2000/04/27 00:27:56 jdc 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 #if __STDC__ 85 __parse_cap (char const *cap, ...) 86 #else 87 __parse_cap (cap, va_alist) 88 const char *cap; 89 va_dcl 90 #endif 91 { 92 va_list ap; 93 static char result[MAXRETURNSIZE]; 94 int c, n; 95 char *dp; 96 int have_input; 97 98 #if __STDC__ 99 va_start (ap, cap); 100 #else 101 va_start(ap); 102 #endif 103 n = 0; /* XXX gcc -Wuninitialized */ 104 105 if (cap == NULL) 106 goto err; 107 #ifdef DEBUG 108 { 109 int i; 110 111 __CTRACE("__parse_cap: cap = "); 112 for (i = 0; i < strlen(cap); i++) 113 __CTRACE("%s", unctrl(cap[i])); 114 __CTRACE("\n"); 115 } 116 #endif 117 have_input = 0; 118 for (dp = result; (c = *cap++) != '\0';) { 119 if (c != '%') { 120 *dp++ = c; 121 continue; 122 } 123 switch (c = *cap++) { 124 case 'n': 125 if (!have_input) { 126 n = va_arg (ap, int); 127 have_input = 1; 128 #ifdef DEBUG 129 __CTRACE ("__parse_cap: %%n, val = %d\n", n); 130 #endif 131 } 132 n ^= 0140; 133 continue; 134 case 'd': 135 if (!have_input) { 136 n = va_arg (ap, int); 137 have_input = 1; 138 #ifdef DEBUG 139 __CTRACE ("__parse_cap: %%d, val = %d\n", n); 140 #endif 141 } 142 if (n < 10) 143 goto one; 144 if (n < 100) 145 goto two; 146 /* FALLTHROUGH */ 147 case '3': 148 if (!have_input) { 149 n = va_arg (ap, int); 150 have_input = 1; 151 #ifdef DEBUG 152 __CTRACE ("__parse_cap: %%3, val = %d\n", n); 153 #endif 154 } 155 *dp++ = (n / 100) | '0'; 156 n %= 100; 157 /* FALLTHROUGH */ 158 case '2': 159 if (!have_input) { 160 n = va_arg (ap, int); 161 have_input = 1; 162 #ifdef DEBUG 163 __CTRACE ("__parse_cap: %%2, val = %d\n", n); 164 #endif 165 } 166 two: *dp++ = n / 10 | '0'; 167 one: *dp++ = n % 10 | '0'; 168 have_input = 0; 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 if (n > *cap++) 179 n += *cap++; 180 else 181 cap++; 182 continue; 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 n += *cap++; 192 /* FALLTHROUGH */ 193 case '.': 194 if (!have_input) { 195 n = va_arg (ap, int); 196 have_input = 1; 197 #ifdef DEBUG 198 __CTRACE ("__parse_cap: %%., val = %d\n", n); 199 #endif 200 } 201 *dp++ = n; 202 have_input = 0; 203 continue; 204 case 'i': 205 if (!have_input) { 206 n = va_arg (ap, int); 207 have_input = 1; 208 #ifdef DEBUG 209 __CTRACE ("__parse_cap: %%i, val = %d\n", n); 210 #endif 211 } 212 n++; 213 continue; 214 case '%': 215 *dp++ = c; 216 continue; 217 case 'B': 218 if (!have_input) { 219 n = va_arg (ap, int); 220 have_input = 1; 221 #ifdef DEBUG 222 __CTRACE ("__parse_cap: %%B, val = %d\n", n); 223 #endif 224 } 225 n = (n / 10 << 4) + n % 10; 226 continue; 227 case 'D': 228 if (!have_input) { 229 n = va_arg (ap, int); 230 have_input = 1; 231 #ifdef DEBUG 232 __CTRACE ("__parse_cap: %%D, val = %d\n", n); 233 #endif 234 } 235 n = n - 2 * (n % 16); 236 continue; 237 /* 238 * XXX 239 * System V terminfo files have lots of extra gunk. 240 * The only other one we've seen in capability strings 241 * is %pN, and it seems to work okay if we ignore it. 242 */ 243 case 'p': 244 ++cap; 245 continue; 246 default: 247 goto err; 248 } 249 } 250 *dp = '\0'; 251 va_end (ap); 252 return (result); 253 254 err: va_end (ap); 255 return ((char *) "\0"); 256 } 257
Indexes created Tue Sep 23 14:10:03 GMT 2025