mirror of
https://github.com/freebsd/freebsd-src
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142 lines
3.8 KiB
C
142 lines
3.8 KiB
C
/*-
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* Copyright (c) 1992, 1993, 1994
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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 8.4 (Berkeley) 7/27/94";
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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)
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* library. Cap is a string containing printf type escapes to allow
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* scrolling. 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, n1, n2)
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const char *cap;
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int n1, n2;
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{
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static char result[MAXRETURNSIZE];
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int c, n, increment = 0;
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char *dp;
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if (cap == NULL)
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goto err;
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for (n = n1, dp = result; (c = *cap++) != '\0';) {
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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 = *cap++) {
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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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/* FALLTHROUGH */
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case '3':
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*dp++ = (n / 100) | '0';
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n %= 100;
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/* FALLTHROUGH */
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case '2':
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two: *dp++ = n / 10 | '0';
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one: *dp++ = n % 10 | '0';
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n = n2;
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if (increment)
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n++;
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continue;
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case '>':
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if (n > *cap++)
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n += *cap++;
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else
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cap++;
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continue;
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case '+':
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n += *cap++;
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/* FALLTHROUGH */
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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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increment = 1;
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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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/*
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* XXX
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* System V terminfo files have lots of extra gunk.
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* The only one we've seen in scrolling strings is
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* %pN, and it seems to work okay if we ignore it.
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*/
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case 'p':
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++cap;
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continue;
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default:
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goto err;
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}
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}
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*dp = '\0';
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return (result);
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err: return("curses: __tscroll failed");
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}
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