xref: /illumos-gate/usr/src/lib/libcurses/screen/cexpand.c (revision 1da57d551424de5a9d469760be7c4b4d4f10a755)

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 1997 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*	Copyright (c) 1988 AT&T	*/
/*	  All Rights Reserved	*/

/*
 * University Copyright- Copyright (c) 1982, 1986, 1988
 * The Regents of the University of California
 * All Rights Reserved
 *
 * University Acknowledgment- Portions of this document are derived from
 * software developed by the University of California, Berkeley, and its
 * contributors.
 */

#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#include "print.h"

#define	BACKSLASH	'\\'
#define	BACKBACK	"\\\\"

extern char *strcat();

static char retbuffer[1024];
static char ret2buffer[1024];

/*
 *  Remove the padding sequences from the input string.
 *  Return the new string without the padding sequences
 *  and the padding itself in padbuffer.
 */
char
*rmpadding(char *str, char *padbuffer, int *padding)
{
	static char rmbuffer[1024];
	register char ch;
	register char *pbufptr;
	register char *retptr = rmbuffer;
	char *svbufptr;
	int padbylines = 0;
	int paddigits = 0;
	int paddecimal = 0;

	padbuffer[0] = rmbuffer[0] = '\0';
	if (padding)
		*padding = 0;
	if (str == NULL)
		return (rmbuffer);

	while (ch = (*str++ & 0377))
		switch (ch) {
			case '$':
				if (*str == '<') {
					svbufptr = ++str;	/* skip '<' */

					/* copy number */
					pbufptr = padbuffer;
					for (; *str && isdigit(*str); str++) {
						*svbufptr++ = *str;
						*pbufptr++ = *str;
					}
					*pbufptr = '\0';
					paddigits += atoi(padbuffer);
					/* check for decimal */
					if (*str == '.') {
						str++;
						pbufptr = padbuffer;
						for (; *str && isdigit(ch);
						    str++) {
							*svbufptr++ = *str;
							*pbufptr++ = *str;
						}
						*pbufptr = '\0';
						paddecimal += atoi(padbuffer);
					}
					for (; (*str == '*') || (*str == '/');
					    str++) {
						if (*str == '*')
							padbylines = 1;
			/* Termcap does not support mandatory padding */
			/* marked with /. Just remove it. */
						else {
							extern char *progname;
							(void) fprintf(stderr,
							    "%s: mandatory "
							    "padding removed\n",
							    progname);
						}
					}
			/* oops, not a padding spec after all */
			/* put us back after the '$<' */
					if (*str != '>') {
						str = svbufptr;
						*retptr++ = '$';
						*retptr++ = '<';
					} else
						str++;	/* skip the '>' */
			/* Flag padding info that is not at the end */
			/* of the string. */
					if (*str != '\0') {
						extern char *progname;
						(void) fprintf(stderr,
						    "%s: padding information "
						    "moved to end\n", progname);
					}
				} else
					*retptr++ = ch;
				break;

			default:
				*retptr++ = ch;
		}
	*retptr = '\0';

	if (paddecimal > 10) {
		paddigits += paddecimal / 10;
		paddecimal %= 10;
	}

	if (paddigits > 0 && paddecimal > 0)
		(void) sprintf(padbuffer, "%d.%d", paddigits, paddecimal);
	else if (paddigits > 0)
		(void) sprintf(padbuffer, "%d", paddigits);
	else if (paddecimal > 0)
		(void) sprintf(padbuffer, ".%d", paddecimal);
	if (padbylines)
		(void) strcat(padbuffer, "*");
	if (padding)
		*padding = paddecimal;
	return (rmbuffer);
}

/*
 *  Convert a character, making appropriate changes to make it printable
 *  for a termcap source entry. Change escape, tab, etc., into their
 *  appropriate equivalents. Return the number of characters printed.
 */
char
*cconvert(char *string)
{
	register int c;
	register char *retptr = retbuffer;

	retbuffer[0] = '\0';
	if (string == NULL)
		return (retbuffer);

	while (c = *string++) {
		/* should check here to make sure that there is enough room */
		/* in retbuffer and realloc it if necessary. */
		c &= 0377;
		/* we ignore the return value from sprintf because BSD/V7 */
		/* systems return a (char *) rather than an int. */
		if (c >= 0200) {
			(void) sprintf(retptr, "\\%.3o", c); retptr += 4; }
		else if (c == '\033') {
			(void) sprintf(retptr, "\\E"); retptr += 2; }
		else if (c == '\t') {
			(void) sprintf(retptr, "\\t"); retptr += 2; }
		else if (c == '\b') {
			(void) sprintf(retptr, "\\b"); retptr += 2; }
		else if (c == '\f') {
			(void) sprintf(retptr, "\\f"); retptr += 2; }
		else if (c == '\n') {
			(void) sprintf(retptr, "\\n"); retptr += 2; }
		else if (c == '\r') {
			(void) sprintf(retptr, "\\r"); retptr += 2; }

		/* unfortunately \: did not work */
		else if (c == ':') {
			(void) sprintf(retptr, "\\072"); retptr += 4; }
		else if (c == '^') {
			(void) sprintf(retptr, "\\^"); retptr += 2; }
		else if (c == BACKSLASH) {
			(void) sprintf(retptr, BACKBACK); retptr += 2; }
		else if (c < ' ' || c == 0177) {
			(void) sprintf(retptr, "^%c", c ^ 0100); retptr += 2; }
		else {
			(void) sprintf(retptr, "%c", c); retptr++; }
	}
	*retptr = '\0';
	return (retbuffer);
}

/*
 *  Convert the terminfo string into a termcap string.
 *  Most of the work is done by rmpadding() above and cconvert(); this
 *  function mainly just pieces things back together. A pointer to the
 *  return buffer is returned.
 *
 *  NOTE: Some things can not be done at all: converting the terminfo
 *  parameterized strings into termcap parameterized strings.
 */

char
*cexpand(char *str)
{
	char padbuffer[512];
	char *retptr;

	retptr = rmpadding(str, padbuffer, (int *)0);
	(void) sprintf(ret2buffer, "%s%s", padbuffer, cconvert(retptr));

	return (ret2buffer);
}

/*
 *  Print out a string onto a stream, changing unprintables into
 *  termcap printables.
 */
int
cpr(FILE *stream, char *string)
{
	register char *ret;
	if (string != NULL) {
		ret = cexpand(string);
		(void) fprintf(stream, "%s", ret);
		return (strlen(ret));
	} else
		return (0);
}