trim.h
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 /* 
  * $Id$
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  *
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  * Copyright (C) 2001-2003 FhG Fokus
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  *
  * This file is part of ser, a free SIP server.
  *
  * ser is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version
  *
  * For a license to use the ser software under conditions
  * other than those described here, or to purchase support for this
  * software, please contact iptel.org by e-mail at the following addresses:
  *    info@iptel.org
  *
  * ser is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License 
  * along with this program; if not, write to the Free Software 
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
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 #ifndef TRIM_H
 #define TRIM_H
 
 #include "str.h"
 
 
 /*
  * This switch-case statement is used in
  * trim_leading and trim_trailing. You can
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  * define characters that should be skipped 
  * here.
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  */
 #define TRIM_SWITCH(c) switch(c) {     \
                        case ' ':       \
                        case '\t':      \
                        case '\r':      \
                        case '\n':      \
                                break;  \
                                        \
                        default:        \
                                return; \
                        }
 
 
 /*
  * Remove any leading whitechars, like spaces,
  * horizontal tabs, carriage returns and line
  * feeds
  *
  * WARNING: String descriptor structure will be
  *          modified ! Make a copy otherwise you
  *          might be unable to free _s->s for
  *          example !
  *
  */
 static inline void trim_leading(str* _s)
 {
 	for(; _s->len > 0; _s->len--, _s->s++) {
 		TRIM_SWITCH(*(_s->s));
 	}
 }
 
 
 /*
  * Remove any trailing white char, like spaces,
  * horizontal tabs, carriage returns and line feeds
  *
  * WARNING: String descriptor structure will be
  *          modified ! Make a copy otherwise you
  *          might be unable to free _s->s for
  *          example !
  */
 static inline void trim_trailing(str* _s)
 {
 	for(; _s->len > 0; _s->len--) {
 		TRIM_SWITCH(_s->s[_s->len - 1]);
 	}
 }
 
 
 /*
  * Do trim_leading and trim_trailing
  *
  * WARNING: String structure will be modified !
  *          Make a copy otherwise you might be
  *          unable to free _s->s for example !
  */
 static inline void trim(str* _s)
 {
 	trim_leading(_s);
 	trim_trailing(_s);
 }
 
 
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 /*
  * right and left space trimming
  *
  * WARNING: String structure will be modified !
  *          Make a copy otherwise you might be
  *          unable to free _s_->s for example !
  */
 #define trim_spaces_lr(_s_)												\
 	do{																	\
 		for(;(_s_).s[(_s_).len-1]==' ';(_s_).s[--(_s_).len]=0);			\
 		for(;(_s_).s[0]==' ';(_s_).s=(_s_).s+1,(_s_).len--);			\
 																		\
 	} while(0);
 	
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 #endif /* TRIM_H */