/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #include <u.h>#include <libc.h>#include "String.h" #define isspace(c) ((c)==' ' || (c)=='\t' || (c)=='\n') /* Get the next field from a String.  The field is delimited by white space, * single or double quotes. */String *s_parse(String *from, String *to){	if (*from->ptr == '\0')		return 0;	if (to == 0)		to = s_new();	if (*from->ptr == '\'') {		from->ptr++;		for (;*from->ptr != '\'' && *from->ptr != '\0'; from->ptr++)			s_putc(to, *from->ptr);		if (*from->ptr == '\'')				from->ptr++;	} else if (*from->ptr == '"') {		from->ptr++;		for (;*from->ptr != '"' && *from->ptr != '\0'; from->ptr++)			s_putc(to, *from->ptr);		if (*from->ptr == '"')				from->ptr++;	} else {		for (;!isspace(*from->ptr) && *from->ptr != '\0'; from->ptr++)			s_putc(to, *from->ptr);	}	s_terminate(to); 	/* crunch trailing white */	while(isspace(*from->ptr))		from->ptr++; 	return to;}