ut.h
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 /*
  *$Id$
  *
  * - various general purpose functions
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  *
  * Copyright (C) 2001-2003 Fhg Fokus
  *
  * 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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  *
  * History
  * ------
  * 2003-01-18 un_escape function introduced for convenience of code needing
  *            the complex&slow feature of unescaping
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  * 2003-01-28 scratchpad removed (jiri)
  * 2003-01-29 pathmax added (jiri)
  * 2003-02-13 strlower added (janakj)
  * 2003-02-28 scratchpad compatibility abandoned (jiri)
  * 2003-03-30 str2int and str2float added (janakj)
  * 2003-04-26 ZSW (jiri)
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  */
 
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 #ifndef ut_h
 #define ut_h
 
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 #include "comp_defs.h"
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 #include <sys/types.h>
 #include <sys/time.h>
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 #include <limits.h>
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 #include <unistd.h>
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 #include <ctype.h>
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 #include "config.h"
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 #include "dprint.h"
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 #include "str.h"
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 struct sip_msg;
 
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 /* zero-string wrapper */
 #define ZSW(_c) ((_c)?(_c):"")
 
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 /* returns string beginning and length without insignificant chars */
 #define trim_len( _len, _begin, _mystr ) \
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 	do{ 	static char _c; \
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 		(_len)=(_mystr).len; \
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 		while ((_len) && ((_c=(_mystr).s[(_len)-1])==0 || _c=='\r' || \
 					_c=='\n' || _c==' ' || _c=='\t' )) \
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 			(_len)--; \
 		(_begin)=(_mystr).s; \
 		while ((_len) && ((_c=*(_begin))==' ' || _c=='\t')) { \
 			(_len)--;\
 			(_begin)++; \
 		} \
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 	}while(0)
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 #define trim_r( _mystr ) \
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 	do{	static char _c; \
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 		while( ((_mystr).len) && ( ((_c=(_mystr).s[(_mystr).len-1]))==0 ||\
 									_c=='\r' || _c=='\n' ) \
 				) \
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 			(_mystr).len--; \
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 	}while(0)
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 #define  translate_pointer( _new_buf , _org_buf , _p) \
 	( (_p)?(_new_buf + (_p-_org_buf)):(0) )
 
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 #define via_len(_via) \
 	((_via)->bsize-((_via)->name.s-\
 		((_via)->hdr.s+(_via)->hdr.len)))
 
 
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 /* char to hex conversion table */
 static char fourbits2char[16] = { '0', '1', '2', '3', '4', '5',
 	'6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
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 /* converts a str to an u. short, returns the u. short and sets *err on
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  * error and if err!=null
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   */
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 static inline unsigned short str2s(char* s, unsigned int len,
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 									int *err)
 {
 	unsigned short ret;
 	int i;
 	unsigned char *limit;
 	unsigned char *init;
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 	unsigned char* str;
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 	/*init*/
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 	str=(unsigned char*)s;
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 	ret=i=0;
 	limit=str+len;
 	init=str;
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 	for(;str<limit ;str++){
 		if ( (*str <= '9' ) && (*str >= '0') ){
 				ret=ret*10+*str-'0';
 				i++;
 				if (i>5) goto error_digits;
 		}else{
 				//error unknown char
 				goto error_char;
 		}
 	}
 	if (err) *err=0;
 	return ret;
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 error_digits:
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 	DBG("str2s: ERROR: too many letters in [%.*s]\n", (int)len, init);
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 	if (err) *err=1;
 	return 0;
 error_char:
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 	DBG("str2s: ERROR: unexpected char %c in %.*s\n", *str, (int)len, init);
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 	if (err) *err=1;
 	return 0;
 }
 
 
 
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 static inline int btostr( char *p,  unsigned char val)
 {
 	unsigned int a,b,i =0;
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 	if ( (a=val/100)!=0 )
 		*(p+(i++)) = a+'0';         /*first digit*/
 	if ( (b=val%100/10)!=0 || a)
 		*(p+(i++)) = b+'0';        /*second digit*/
 	*(p+(i++)) = '0'+val%10;              /*third digit*/
 
 	return i;
 }
 
 
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 #define INT2STR_MAX_LEN 11 /* 10 digits + 0 */
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 /* returns a pointer to a static buffer containing l in asciiz & sets len */
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 static inline char* int2str(unsigned int l, int* len)
 {
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 	static char r[INT2STR_MAX_LEN];
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 	int i;
 	
 	i=9;
 	r[10]=0; /* null terminate */
 	do{
 		r[i]=l%10+'0';
 		i--;
 		l/=10;
 	}while(l && (i>=0));
 	if (l && (i<0)){
 		LOG(L_CRIT, "BUG: int2str: overflow\n");
 	}
 	if (len) *len=9-i;
 	return &r[i+1];
 }
 
 
 
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 /* faster memchr version */
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 static inline char* q_memchr(char* p, int c, unsigned int size)
 {
 	char* end;
 
 	end=p+size;
 	for(;p<end;p++){
 		if (*p==(unsigned char)c) return p;
 	}
 	return 0;
 }
 	
 
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 inline static int reverse_hex2int( char *c, int len )
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 {
 	char *pc;
 	int r;
 	char mychar;
 
 	r=0;
 	for (pc=c+len-1; len>0; pc--, len--) {
 		r <<= 4 ;
 		mychar=*pc;
 		if ( mychar >='0' && mychar <='9') r+=mychar -'0';
 		else if (mychar >='a' && mychar <='f') r+=mychar -'a'+10;
 		else if (mychar  >='A' && mychar <='F') r+=mychar -'A'+10;
 		else return -1;
 	}
 	return r;
 }
 
 inline static int int2reverse_hex( char **c, int *size, int nr )
 {
 	unsigned short digit;
 
 	if (*size && nr==0) {
 		**c = '0';
 		(*c)++;
 		(*size)--;
 		return 1;
 	}
 
 	while (*size && nr ) {
 		digit = nr & 0xf ;
 		**c= digit >= 10 ? digit + 'a' - 10 : digit + '0';
 		nr >>= 4;
 		(*c)++;
 		(*size)--;
 	}
 	return nr ? -1 /* number not processed; too little space */ : 1;
 }
 
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 /* double output length assumed ; does NOT zero-terminate */
 inline static int string2hex( 
 	/* input */ unsigned char *str, int len,
 	/* output */ char *hex )
 {
 	int orig_len;
 
 	if (len==0) {
 		*hex='0';
 		return 1;
 	}
 
 	orig_len=len;
 	while ( len ) {
 
 		*hex=fourbits2char[(*str) >> 4];
 		hex++;
 		*hex=fourbits2char[(*str) & 0xf];
 		hex++;
 		len--;
 		str++;
 
 	}
 	return orig_len-len;
 }
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 /* portable sleep in microseconds (no interrupt handling now) */
 
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 inline static void sleep_us( unsigned int nusecs )
 {
 	struct timeval tval;
 	tval.tv_sec=nusecs/100000;
 	tval.tv_usec=nusecs%1000000;
 	select(0, NULL, NULL, NULL, &tval );
 }
 
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 /* portable determination of max_path */
 inline static int pathmax()
 {
 #ifdef PATH_MAX
 	static int pathmax=PATH_MAX;
 #else
 	static int pathmax=0;
 #endif
 	if (pathmax==0) { /* init */
 		pathmax=pathconf("/", _PC_PATH_MAX);
 		pathmax=(pathmax<=0)?PATH_MAX_GUESS:pathmax+1;
 	}
 	return pathmax;
 }
 
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 inline static int hex2int(char hex_digit)
 {
 	if (hex_digit>='0' && hex_digit<='9')
 		return hex_digit-'0';
 	if (hex_digit>='a' && hex_digit<='f')
 		return hex_digit-'a'+10;
 	if (hex_digit>='A' && hex_digit<='F')
 		return hex_digit-'A'+10;
 	/* no valid hex digit ... */
 	LOG(L_ERR, "ERROR: hex2int: '%c' is no hex char\n", hex_digit );
 	return -1;
 }
 
 /* Un-escape URI user  -- it takes a pointer to original user
    str, as well as the new, unescaped one, which MUST have
    an allocated buffer linked to the 'str' structure ;
    (the buffer can be allocated with the same length as
    the original string -- the output string is always
    shorter (if escaped characters occur) or same-long
    as the original one).
 
    only printeable characters are permitted
 
 	<0 is returned on an uneascaping error, length of the
 	unescaped string otherwise
 */
 inline static int un_escape(str *user, str *new_user ) 
 {
  	int i, j, value;
 	int hi, lo;
 
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 	if( new_user==0 || new_user->s==0) {
 		LOG(L_CRIT, "BUG: un_escape: called with invalid param\n");
 		return -1;
 	}
 
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 	new_user->len = 0;
 	j = 0;
 
 	for (i = 0; i < user->len; i++) {
 		if (user->s[i] == '%') {
 			if (i + 2 >= user->len) {
 				LOG(L_ERR, "ERROR: un_escape: escape sequence too short in"
 					" '%.*s' @ %d\n",
 					user->len, user->s, i );
 				goto error;
 			}
 			hi=hex2int(user->s[i + 1]);
 			if (hi<0) {
 				LOG(L_ERR, "ERROR: un_escape: non-hex high digit in an escape sequence in"
 					" '%.*s' @ %d\n",
 					user->len, user->s, i+1 );
 				goto error;
 			}
 			lo=hex2int(user->s[i + 2]);
 			if (lo<0) {
 				LOG(L_ERR, "ERROR: non-hex low digit in an escape sequence in "
 					"'%.*s' @ %d\n",
 					user->len, user->s, i+2 );
 				goto error;
 			}
 			value=(hi<<4)+lo;
 			if (value < 32 || value > 126) {
 				LOG(L_ERR, "ERROR: non-ASCII escaped character in '%.*s' @ %d\n",
 					user->len, user->s, i );
 				goto error;
 			}
 			new_user->s[j] = value;
 			i+=2; /* consume the two hex digits, for cycle will move to the next char */
 		} else {
 			new_user->s[j] = user->s[i];
 		}
         j++; /* good -- we translated another character */
 	}
 	new_user->len = j;
 	return j;
 
 error:
 	new_user->len = j;
 	return -1;
 } 
 
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 /*
  * Convert a string to lower case
  */
 static inline void strlower(str* _s)
 {
 	int i;
 
 	for(i = 0; i < _s->len; i++) {
 		_s->s[i] = tolower(_s->s[i]);
 	}
 }
 
 
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 /*
  * Convert a str into integer
  */
 static inline int str2int(str* _s, unsigned int* _r)
 {
 	int i;
 	
 	*_r = 0;
 	for(i = 0; i < _s->len; i++) {
 		if ((_s->s[i] >= '0') && (_s->s[i] <= '9')) {
 			*_r *= 10;
 			*_r += _s->s[i] - '0';
 		} else {
 			return -1;
 		}
 	}
 	
 	return 0;
 }
 
 
 /*
  * Convert a str to float
  */
 static inline int str2float(str* _s, float* _r)
 {
 	int i, dot = 0;
 	float order = 0.1;
 
 	*_r = 0;
 	for(i = 0; i < _s->len; i++) {
 		if (_s->s[i] == '.') {
 			if (dot) return -1;
 			dot = 1;
 			continue;
 		}
 		if ((_s->s[i] >= '0') && (_s->s[i] <= '9')) {
 			if (dot) {
 				*_r += (_s->s[i] - '0') * order;
 				order /= 10;
 			} else {
 				*_r *= 10;
 				*_r += _s->s[i] - '0';
 			}
 		} else {
 			return -2;
 		}
 	}
 	return 0;
 }
 
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 #endif