xref: /illumos-gate/usr/src/cmd/ttymon/tmparse.c (revision 3bb2c1567625e7b11f8c2a5335125224717af64a)

/*
 * 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 (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
/*	  All Rights Reserved	*/

#include <stdio.h>
#include <ctype.h>

char quoted(char *, int *);

/*
 *	getword	- extract one token from the string
 *	char *ptr;	pointer to the string to be scanned
 *	int *size;	*size = number of characters scanned
 *	int getall;	if TRUE, get all char until ':' or '\0'
 *		- token delimiter is white space if getall is FALSE
 *		- token delimiter is ':' or '\0' if getall is TRUE
 */
char *
getword(char *ptr, int *size, int getall)
{
	char *optr, c;
	static char word[BUFSIZ];
	int qsize;

	*size = 0;
	if (!getall) {
		/* Skip all white spaces */
		while (isspace(*ptr)) {
			(*size)++;
			ptr++;
		}
	}

	/* Put all characters from here to next white space or ':' or '\0' */
	/* into the word, up to the size of the word. */
	for (optr = word, *optr = '\0';
	    *ptr != '\0' && *ptr != ':'; ptr++, (*size)++) {
		if (!getall) {
			if (isspace(*ptr))
				break;
		}

		/* If the character is quoted, analyze it. */
		if (*ptr == '\\') {
			c = quoted(ptr, &qsize);
			(*size) += qsize;
			ptr += qsize;
		} else c = *ptr;

		/* If there is room, add this character to the word. */
		if (optr < &word[BUFSIZ])
			*optr++ = c;
	}

	/* skip trailing blanks if any */
	while (isspace(*ptr)) {
		(*size)++;
		ptr++;
	}

	/* Make sure the line is null terminated. */
	*optr++ = '\0';
	return (word);
}

/*	"quoted" takes a quoted character, starting at the quote	*/
/*	character, and returns a single character plus the size of	*/
/*	the quote string.  "quoted" recognizes the following as		*/
/*	special, \n,\r,\v,\t,\b,\f as well as the \nnn notation.	*/
char
quoted(char *ptr, int *qsize)
{
	char c, *rptr;
	int i;

	rptr = ptr;
	switch (*++rptr) {
	case 'n':
		c = '\n';
		break;
	case 'r':
		c = '\r';
		break;
	case 'v':
		c = '\013';
		break;
	case 'b':
		c = '\b';
		break;
	case 't':
		c = '\t';
		break;
	case 'f':
		c = '\f';
		break;
	case ':':
		c = ':';
		break;
	default:

/* If this is a numeric string, take up to three characters of */
/* it as the value of the quoted character. */
		if (*rptr >= '0' && *rptr <= '7') {
			for (i = 0, c = 0; i < 3; i++) {
				c = c * 8 + (*rptr - '0');
				if (*++rptr < '0' || *rptr > '7')
					break;
			}
			rptr--;

/* If the character following the '\\' is a NULL, back up the */
/* ptr so that the NULL won't be missed.  The sequence */
/* backslash null is essentually illegal. */
		} else if (*rptr == '\0') {
			c = '\0';
			rptr--;

		/* In all other cases the quoting does nothing. */
		} else {
			c = *rptr;
		}
		break;
	}

	/* Compute the size of the quoted character. */
	(*qsize) = rptr - ptr;
	return (c);
}