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Diffstat (limited to 'lib/libterm/tgoto.c')
| -rw-r--r-- | lib/libterm/tgoto.c | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/lib/libterm/tgoto.c b/lib/libterm/tgoto.c new file mode 100644 index 0000000..f0e4cc4 --- /dev/null +++ b/lib/libterm/tgoto.c @@ -0,0 +1,207 @@ +/* + * 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. 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. + */ + +#ifndef lint +static char sccsid[] = "@(#)tgoto.c 8.1 (Berkeley) 6/4/93"; +#endif /* not lint */ + +#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(CM, destcol, destline) + char *CM; + int destcol, destline; +{ + static char result[MAXRETURNSIZE]; + static char added[10]; + char *cp = CM; + register char *dp = result; + register int c; + int oncol = 0; + register 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++) { + if (c != '%') { + *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': + *dp++ = (which / 100) | '0'; + which %= 100; + /* fall into... */ + + case '2': +two: + *dp++ = which / 10 | '0'; +one: + *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 '.': +casedot: + /* + * 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 == '\t' || */ which == '\n') { + if (oncol || UP) /* Assumption: backspace works */ + /* + * Loop needed because newline happens + * to be the successor of tab. + */ + do { + strcat(added, oncol ? (BC ? BC : "\b") : UP); + which++; + } while (which == '\n'); + } + *dp++ = which; + goto swap; + + case 'r': + oncol = 1; + goto setwhich; + + case 'i': + destcol++; + destline++; + which++; + continue; + + case '%': + *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; + } + } + strcpy(dp, added); + return (result); +} |
