/* $OpenBSD: tgoto.c,v 1.2 2015/11/15 07:12:50 deraadt Exp $ */ /* $NetBSD: tgoto.c,v 1.5 1995/06/05 19:45:54 pk Exp $ */ /* * Copyright (c) 1980, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <string.h> #include <curses.h> #define CTRL(c) ((c) & 037) #define MAXRETURNSIZE 64 char *UP; char *BC; /* * Routine to perform cursor addressing. * CM is a string containing printf type escapes to allow * cursor addressing. We start out ready to print the destination * line, and switch each time we print row or column. * The following escapes are defined for substituting row/column: * * %d as in printf * %2 like %2d * %3 like %3d * %. gives %c hacking special case characters * %+x like %c but adding x first * * The codes below affect the state but don't use up a value. * * %>xy if value > x add y * %r reverses row/column * %i increments row/column (for one origin indexing) * %% gives % * %B BCD (2 decimal digits encoded in one byte) * %D Delta Data (backwards bcd) * * all other characters are ``self-inserting''. */ char * tgoto(char *CM, int destcol, int destline) { static char result[MAXRETURNSIZE]; static char added[10]; char *cp = CM; char *dp = result; int c; int oncol = 0; int which = destline; if (cp == 0) { toohard: /* * ``We don't do that under BOZO's big top'' */ return ("OOPS"); } added[0] = 0; while ((c = *cp++) != '\0') { if (c != '%') { if (dp >= &result[MAXRETURNSIZE]) goto toohard; *dp++ = c; continue; } switch (c = *cp++) { #ifdef CM_N case 'n': destcol ^= 0140; destline ^= 0140; goto setwhich; #endif case 'd': if (which < 10) goto one; if (which < 100) goto two; /* fall into... */ case '3': if (dp >= &result[MAXRETURNSIZE]) goto toohard; *dp++ = (which / 100) | '0'; which %= 100; /* fall into... */ case '2': two: if (dp >= &result[MAXRETURNSIZE]) goto toohard; *dp++ = which / 10 | '0'; one: if (dp >= &result[MAXRETURNSIZE]) goto toohard; *dp++ = which % 10 | '0'; swap: oncol = 1 - oncol; setwhich: which = oncol ? destcol : destline; continue; #ifdef CM_GT case '>': if (which > *cp++) which += *cp++; else cp++; continue; #endif case '+': which += *cp++; /* fall into... */ case '.': /* * This code is worth scratching your head at for a * while. The idea is that various weird things can * happen to nulls, EOT's, tabs, and newlines by the * tty driver, arpanet, and so on, so we don't send * them if we can help it. * * Tab is taken out to get Ann Arbors to work, otherwise * when they go to column 9 we increment which is wrong * because bcd isn't continuous. We should take out * the rest too, or run the thing through more than * once until it doesn't make any of these, but that * would make termlib (and hence pdp-11 ex) bigger, * and also somewhat slower. This requires all * programs which use termlib to stty tabs so they * don't get expanded. They should do this anyway * because some terminals use ^I for other things, * like nondestructive space. */ if ((which == 0 || which == CTRL('d') || which == '\n') && (oncol || UP)) /* Assumption: backspace works */ /* * Loop needed because newline happens * to be the successor of tab. */ do { if (strlcat(added, oncol ? (BC ? BC : "\b") : UP, sizeof(added)) >= sizeof(added)) goto toohard; which++; } while (which == '\n'); if (dp >= &result[MAXRETURNSIZE]) goto toohard; *dp++ = which; goto swap; case 'r': oncol = 1; goto setwhich; case 'i': destcol++; destline++; which++; continue; case '%': if (dp >= &result[MAXRETURNSIZE]) goto toohard; *dp++ = c; continue; #ifdef CM_B case 'B': which = (which/10 << 4) + which%10; continue; #endif #ifdef CM_D case 'D': which = which - 2 * (which%16); continue; #endif default: goto toohard; } } if (strlcpy(dp, added, sizeof(result) - (dp - result)) >= sizeof(result) - (dp - result)) goto toohard; return (result); }
