141 lines
3.6 KiB
C
141 lines
3.6 KiB
C
/*-
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)tscroll.c 8.1 (Berkeley) 6/4/93";
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#endif /* not lint */
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#include <curses.h>
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#define MAXRETURNSIZE 64
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/*
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* Routine to perform scrolling. Derived from tgoto.c in tercamp(3) library.
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* Cap is a string containing printf type escapes to allow
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* scrolling.
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* The following escapes are defined for substituting n:
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*
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* %d as in printf
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* %2 like %2d
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* %3 like %3d
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* %. gives %c hacking special case characters
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* %+x like %c but adding x first
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*
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* The codes below affect the state but don't use up a value.
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*
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* %>xy if value > x add y
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* %i increments n
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* %% gives %
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* %B BCD (2 decimal digits encoded in one byte)
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* %D Delta Data (backwards bcd)
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*
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* all other characters are ``self-inserting''.
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*/
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char *
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__tscroll(cap, n)
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const char *cap;
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int n;
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{
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static char result[MAXRETURNSIZE];
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register char *dp;
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register int c;
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char *cp;
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if (cap == NULL) {
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toohard:
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/*
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* ``We don't do that under BOZO's big top''
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*/
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return ("OOPS");
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}
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cp = (char *) cap;
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dp = result;
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while (c = *cp++) {
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if (c != '%') {
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*dp++ = c;
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continue;
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}
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switch (c = *cp++) {
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case 'n':
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n ^= 0140;
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continue;
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case 'd':
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if (n < 10)
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goto one;
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if (n < 100)
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goto two;
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/* fall into... */
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case '3':
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*dp++ = (n / 100) | '0';
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n %= 100;
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/* fall into... */
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case '2':
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two:
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*dp++ = n / 10 | '0';
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one:
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*dp++ = n % 10 | '0';
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continue;
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case '>':
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if (n > *cp++)
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n += *cp++;
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else
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cp++;
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continue;
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case '+':
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n += *cp++;
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/* fall into... */
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case '.':
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*dp++ = n;
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continue;
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case 'i':
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n++;
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continue;
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case '%':
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*dp++ = c;
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continue;
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case 'B':
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n = (n / 10 << 4) + n % 10;
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continue;
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case 'D':
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n = n - 2 * (n % 16);
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continue;
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default:
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goto toohard;
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}
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}
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*dp = '\0';
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return (result);
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}
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