/*      $NetBSD: subr.c,v 1.1.1.2 2012/09/09 16:08:11 christos Exp $    */

/*
* Copyright (C) 2009  Internet Systems Consortium, Inc. ("ISC")
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/

/*
* Portions Copyright (c) 1993 by Digital Equipment Corporation.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies, and that
* the name of Digital Equipment Corporation not be used in advertising or
* publicity pertaining to distribution of the document or software without
* specific, written prior permission.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
* CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*/

#ifndef lint
static const char sccsid[] = "@(#)subr.c        5.24 (Berkeley) 3/2/91";
static const char rcsid[] = "Id: subr.c,v 1.3 2009/03/03 23:49:07 tbox Exp ";
#endif /* not lint */

/*
*******************************************************************************
*
*  subr.c --
*
*      Miscellaneous subroutines for the name server
*      lookup program.
*
*      Copyright (c) 1985
*      Andrew Cherenson
*      U.C. Berkeley
*      CS298-26  Fall 1985
*
*******************************************************************************
*/

#include "port_before.h"

#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>

#include <netinet/in.h>
#include <arpa/nameser.h>
#include <arpa/inet.h>

#include <ctype.h>
#include <netdb.h>
#include <setjmp.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "port_after.h"

#include "resolv.h"
#include "res.h"


/*
*******************************************************************************
*
*  StringToClass --
*
*      Converts a string form of a query class name to its
*      corresponding integer value.
*
*******************************************************************************
*/
int
StringToClass(class, dflt, errorfile)
   char *class;
   int dflt;
   FILE *errorfile;
{
       int result, success;

       result = sym_ston(__p_class_syms, class, &success);
       if (success)
               return result;

       if (errorfile)
               fprintf(errorfile, "unknown query class: %s\n", class);
       return(dflt);
}


/*
*******************************************************************************
*
*  StringToType --
*
*      Converts a string form of a query type name to its
*      corresponding integer value.
*
*******************************************************************************
*/

int
StringToType(type, dflt, errorfile)
   char *type;
   int dflt;
   FILE *errorfile;
{
       int result, success;

       result = sym_ston(__p_type_syms, type, &success);
       if (success)
               return (result);

       if (errorfile)
               fprintf(errorfile, "unknown query type: %s\n", type);
       return (dflt);
}

/*
* Skip over leading white space in SRC and then copy the next sequence of
* non-whitespace characters into DEST. No more than (DEST_SIZE - 1)
* characters are copied. DEST is always null-terminated. Returns 0 if no
* characters could be copied into DEST. Returns the number of characters
* in SRC that were processed (i.e. the count of characters in the leading
* white space and the first non-whitespace sequence).
*
*      int i;
*      char *p = "  foo bar ", *q;
*      char buf[100];
*
*      q = p + pickString(p, buf, sizeof buff);
*      assert (strcmp (q, " bar ") == 0) ;
*
*/

int
pickString(const char *src, char *dest, size_t dest_size) {
       const char *start;
       const char *end ;
       size_t sublen ;

       if (dest_size == 0 || dest == NULL || src == NULL)
               return 0;

       for (start = src ; isspace((unsigned char)*start) ; start++)
               /* nada */ ;

       for (end = start ; *end != '\0' && !isspace((unsigned char)*end) ; end++)
               /* nada */ ;

       sublen = end - start ;

       if (sublen == 0 || sublen > (dest_size - 1))
               return 0;

       strncpy (dest, start, sublen);

       dest[sublen] = '\0' ;

       return (end - src);
}




/*
* match the string FORMAT against the string SRC. Leading whitespace in
* FORMAT will match any amount of (including no) leading whitespace in
* SRC. Any amount of whitespace inside FORMAT matches any non-zero amount
* of whitespace in SRC. Value returned is 0 if match didn't occur, or the
* amount of characters in SRC that did match
*
*      int i ;
*
*      i = matchString(" a    b c", "a b c") ;
*      assert (i == 5) ;
*      i = matchString("a b c", "  a b c");
*      assert (i == 0) ;    becasue no leading white space in format
*      i = matchString(" a b c", " a   b     c");
*      assert(i == 12);
*      i = matchString("aa bb ", "aa      bb      ddd sd");
*      assert(i == 16);
*/
int
matchString (const char *format, const char *src) {
       const char *f = format;
       const char *s = src;

       if (f == NULL || s == NULL)
               goto notfound;

       if (isspace((unsigned char)*f)) {
               while (isspace((unsigned char)*f))
                       f++ ;
               while (isspace((unsigned char)*s))
                       s++ ;
       }

       while (1) {
               if (isspace((unsigned char)*f)) {
                       if (!isspace((unsigned char)*s))
                               goto notfound;
                       while(isspace((unsigned char)*s))
                               s++;
                       /* any amount of whitespace in the format string
                          will match any amount of space in the source
                          string. */
                       while (isspace((unsigned char)*f))
                               f++;
               } else if (*f == '\0') {
                       return (s - src);
               } else if (*f != *s) {
                       goto notfound;
               } else {
                       s++ ;
                       f++ ;
               }
       }
notfound:
       return 0 ;
}

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