1 /*-
2 * Copyright (c) 1992, 1993
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 8.1 (Berkeley) 6/4/93";
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) library.
44 * Cap is a string containing printf type escapes to allow
45 * scrolling.
46 * The following escapes are defined for substituting n:
47 *
48 * %d as in printf
49 * %2 like %2d
50 * %3 like %3d
51 * %. gives %c hacking special case characters
52 * %+x like %c but adding x first
53 *
54 * The codes below affect the state but don't use up a value.
55 *
56 * %>xy if value > x add y
57 * %i increments n
58 * %% gives %
59 * %B BCD (2 decimal digits encoded in one byte)
60 * %D Delta Data (backwards bcd)
61 *
62 * all other characters are ``self-inserting''.
63 */
64 char *
__tscroll(cap,n)65 __tscroll(cap, n)
66 const char *cap;
67 int n;
68 {
69 static char result[MAXRETURNSIZE];
70 register char *dp;
71 register int c;
72 char *cp;
73
74 if (cap == NULL) {
75 toohard:
76 /*
77 * ``We don't do that under BOZO's big top''
78 */
79 return ("OOPS");
80 }
81
82 cp = (char *) cap;
83 dp = result;
84 while (c = *cp++) {
85 if (c != '%') {
86 *dp++ = c;
87 continue;
88 }
89 switch (c = *cp++) {
90 case 'n':
91 n ^= 0140;
92 continue;
93 case 'd':
94 if (n < 10)
95 goto one;
96 if (n < 100)
97 goto two;
98 /* fall into... */
99 case '3':
100 *dp++ = (n / 100) | '0';
101 n %= 100;
102 /* fall into... */
103 case '2':
104 two:
105 *dp++ = n / 10 | '0';
106 one:
107 *dp++ = n % 10 | '0';
108 continue;
109 case '>':
110 if (n > *cp++)
111 n += *cp++;
112 else
113 cp++;
114 continue;
115 case '+':
116 n += *cp++;
117 /* fall into... */
118 case '.':
119 *dp++ = n;
120 continue;
121 case 'i':
122 n++;
123 continue;
124 case '%':
125 *dp++ = c;
126 continue;
127
128 case 'B':
129 n = (n / 10 << 4) + n % 10;
130 continue;
131 case 'D':
132 n = n - 2 * (n % 16);
133 continue;
134 default:
135 goto toohard;
136 }
137 }
138 *dp = '\0';
139 return (result);
140 }
141