/*

  *  Copyright (C) 2002, 2003 Tomasz Kojm <zolw@konarski.edu.pl>

  *
  *  This program 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.
  *
  *  This program 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., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 

 #if HAVE_CONFIG_H
 #include "clamav-config.h"
 #endif
 

 #include "str.h"
 

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <ctype.h>
 
 #include "clamav.h"
 #include "others.h"
 #include "defaults.h"
 

 static int cli_hex2int(int c)

 {
 	int l = tolower(c);
 
     if (!isascii(l))
     	return -1;
     if (isdigit(l))
 	return l - '0';
     if ((l >= 'a') && (l <= 'f'))
 	return l + 10 - 'a';
 
     cli_errmsg("hex2int() translation problem (%d)\n", l);
     return -1;
 }
 
 short int *cl_hex2str(const char *hex)
 {
 	short int *str, *ptr, val, c;
 	int i, len;
 
     len = strlen(hex);
 
     /* additional check - hex strings are parity length here */
     if(len % 2 != 0) {
 	cli_errmsg("cl_hex2str(): Malformed hexstring: %s (length: %d)\n", hex, len);
 	return NULL;
     }
 
     str = cli_calloc((len / 2) + 1, sizeof(short int));
     if(!str)
 	return NULL;
 
     ptr = str;
 
     for(i = 0; i < len; i += 2) {
 	if(hex[i] == '?') {
 	    val = CLI_IGN;
 	} else {
 	    if((c = cli_hex2int(hex[i])) >= 0) {
 		val = c;
 		if((c = cli_hex2int(hex[i+1])) >= 0) {
 		    val = (val << 4) + c;

 		} else {

 		    free(str);
 		    return NULL;
 		}
 	    } else {
 		free(str);
 		return NULL;
 	    }
 	}
 	*ptr++ = val;
     }
 
     return str;
 }
 
 char *cl_str2hex(const char *string, unsigned int len)
 {
 	char *hexstr;
 	char HEX[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
 		       'a', 'b', 'c', 'd', 'e', 'f' };

 	unsigned int i, j;

 
     if((hexstr = (char *) cli_calloc(2 * len + 1, sizeof(char))) == NULL)
 	return NULL;
 
     for(i = 0, j = 0; i < len; i++, j += 2) {
 	hexstr[j] = HEX[(string[i] >> 4) & 0xf];
 	hexstr[j + 1] = HEX[string[i] & 0xf];
     }
 
     return hexstr;
 }
 
 int cli_strbcasestr(const char *haystack, const char *needle)
 {
 	char *pt = (char *) haystack;
 	int i, j;
 
     i = strlen(haystack);
     j = strlen(needle);
 
     if(i < j)
 	return 0;
 
     pt += i - j;
 
     return !strcasecmp(pt, needle);
 }
 

 /*
  * Remove trailing NL and CR characters from the end of the given string.
  * Return the new length of the string (ala strlen)
  */
 int
 cli_chomp(char *string)

 {

 	int l;

 	if(string == NULL)
 		return -1;

 	l  = strlen(string);

 	if(l == 0)
 		return 0;

 	--l;
 
 	while((l >= 0) && ((string[l] == '\n') || (string[l] == '\r')))
 		string[l--] = '\0';

 	return l + 1;
 }

 /*
  * char *cli_strok(const char *line, int fieldno, char *delim)
  * Return a copy of field <fieldno> from the string <line>, where
  * fields are delimited by any char from <delim>, or NULL if <line>
  * doesn't have <fieldno> fields or not enough memory is available.
  * The caller has to free() the result afterwards.
  */

 char *cli_strtok(const char *line, int fieldno, const char *delim)

 {

     int counter = 0, i, j;
     char *buffer = NULL;

     /* step to arg # <fieldno> */
     for (i=0; line[i] && counter != fieldno; i++) {
 	if (strchr(delim, line[i])) {
 	    counter++;
 	    while(line[i+1] && strchr(delim, line[i+1])) {
 		i++;

 	    }

 	}
     }
     if (!line[i]) {
 	/* end of buffer before field reached */
 	return NULL;

     }
 

     for (j=i; line[j]; j++) {
 	if (strchr(delim, line[j])) {
 	    break;
 	}
     }
     if (i == j) {

 	return NULL;
     }

     buffer = malloc(j-i+1);

     strncpy(buffer, line+i, j-i);
     buffer[j-i] = '\0';

 
     return buffer;

 }