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/*
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 * Copyright (c) 2002-2006 The TenDRA Project <http://www.tendra.org/>.
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions are met:
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 *
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 * 1. Redistributions of source code must retain the above copyright notice,
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 *    this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright notice,
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 *    this list of conditions and the following disclaimer in the documentation
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 *    and/or other materials provided with the distribution.
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 * 3. Neither the name of The TenDRA Project nor the names of its contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific, prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
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 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
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 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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 * EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 *
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 * $Id$
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 */
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/*
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    		 Crown Copyright (c) 1997
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    This TenDRA(r) Computer Program is subject to Copyright
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    owned by the United Kingdom Secretary of State for Defence
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    acting through the Defence Evaluation and Research Agency
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    (DERA).  It is made available to Recipients with a
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    royalty-free licence for its use, reproduction, transfer
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    to other parties and amendment for any purpose not excluding
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    product development provided that any such use et cetera
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    shall be deemed to be acceptance of the following conditions:-
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        (1) Its Recipients shall ensure that this Notice is
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        reproduced upon any copies or amended versions of it;
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        (2) Any amended version of it shall be clearly marked to
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        show both the nature of and the organisation responsible
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        for the relevant amendment or amendments;
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        (3) Its onward transfer from a recipient to another
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        party shall be deemed to be that party's acceptance of
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        these conditions;
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        (4) DERA gives no warranty or assurance as to its
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        quality or suitability for any purpose and DERA accepts
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        no liability whatsoever in relation to any use to which
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        it may be put.
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*/
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/**** cstring.c --- C string manipulation.
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 *
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 ** Author: Steve Folkes <smf@hermes.mod.uk>
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 *
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 **** Commentary:
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 *
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 * This file implements the C string manipulation facility specified in the
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 * file "cstring.h".  See that file for more details.
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 *
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 **** Change Log:
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 * $Log: cstring.c,v $
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 * Revision 1.1.1.1  1998/01/17  15:57:17  release
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 * First version to be checked into rolling release.
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 *
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 * Revision 1.2  1994/12/12  11:45:24  smf
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 * Performing changes for 'CR94_178.sid+tld-update' - bringing in line with
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 * OSSG C Coding Standards.
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 *
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 * Revision 1.1.1.1  1994/07/25  16:06:09  smf
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 * Initial import of os-interface shared files.
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 *
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**/
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/****************************************************************************/
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#include <string.h>
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#include "cstring.h"
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#include "syntax.h"
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/*--------------------------------------------------------------------------*/
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CStringP
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cstring_duplicate(CStringP cstring)
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{
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    unsigned length = cstring_length(cstring);
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    CStringP tmp    = ALLOCATE_VECTOR(char, length + 1);
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   (void)strcpy(tmp, cstring);
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    return(tmp);
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}
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CStringP
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cstring_duplicate_prefix(CStringP cstring,				  unsigned prefix)
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{
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    unsigned length = cstring_length(cstring);
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    if (length <= prefix) {
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	CStringP tmp = ALLOCATE_VECTOR(char, length + 1);
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	(void)strcpy(tmp, cstring);
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	return(tmp);
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    } else {
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	CStringP tmp = ALLOCATE_VECTOR(char, prefix + 1);
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	(void)memcpy((GenericP)tmp,(GenericP)cstring,(SizeT)prefix);
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	tmp[prefix] = '\0';
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	return(tmp);
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    }
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}
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unsigned
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cstring_hash_value(CStringP cstring)
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{
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    unsigned value = 0;
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    while (*cstring) {
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	value += ((unsigned)(*cstring++));
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    }
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    return(value);
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}
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#ifdef FS_FAST
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#undef cstring_length
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#endif /* defined (FS_FAST) */
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unsigned
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cstring_length(CStringP cstring)
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{
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    return((unsigned)strlen(cstring));
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}
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#ifdef FS_FAST
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#define cstring_length(s)	((unsigned)strlen(s))
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#endif /* defined (FS_FAST) */
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#ifdef FS_FAST
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#undef cstring_equal
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#endif /* defined (FS_FAST) */
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BoolT
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cstring_equal(CStringP cstring1,		       CStringP cstring2)
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{
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    return(strcmp(cstring1, cstring2) == 0);
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}
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#ifdef FS_FAST
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#define cstring_equal(s1, s2)	(strcmp((s1), (s2)) == 0)
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#endif /* defined (FS_FAST) */
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BoolT
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cstring_ci_equal(CStringP cstring1,			  CStringP cstring2)
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{
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    char c1;
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    char c2;
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    do {
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	c1 = syntax_upcase(*cstring1++);
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	c2 = syntax_upcase(*cstring2++);
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    } while ((c1) && (c2) && (c1 == c2));
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    return(c1 == c2);
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}
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BoolT
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cstring_to_unsigned(CStringP  cstring,			     unsigned *num_ref)
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{
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    unsigned number = 0;
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    if (*cstring == '\0') {
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	return(FALSE);
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    }
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    do {
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	int value = syntax_value(*cstring);
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	if ((value == SYNTAX_NO_VALUE) || (value >= 10) ||
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	   (((UINT_MAX - (unsigned)value) / (unsigned)10) < number)) {
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	    return(FALSE);
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	}
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	number *= (unsigned)10;
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	number += (unsigned)value;
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    } while (*++cstring);
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    *num_ref = number;
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    return(TRUE);
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}
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#ifdef FS_FAST
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#undef cstring_contains
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#endif /* defined (FS_FAST) */
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BoolT
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cstring_contains(CStringP cstring,			  char     c)
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{
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    return(strchr(cstring, c) != NIL(CStringP));
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}
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#ifdef FS_FAST
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#define cstring_contains(s, c)	(strchr((s), (c)) != NIL(CStringP))
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#endif /* defined (FS_FAST) */
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#ifdef FS_FAST
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#undef cstring_find
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#endif /* defined (FS_FAST) */
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CStringP
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cstring_find(CStringP cstring,		      char     c)
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{
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    return(strchr(cstring, c));
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}
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#ifdef FS_FAST
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#define cstring_find(s, c)	(strchr((s), (c)))
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#endif /* defined (FS_FAST) */
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#ifdef FS_FAST
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#undef cstring_find_reverse
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#endif /* defined (FS_FAST) */
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CStringP
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cstring_find_reverse(CStringP cstring,			      char     c)
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{
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    return(strrchr(cstring, c));
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}
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#ifdef FS_FAST
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#define cstring_find_reverse(s, c)	(strrchr((s), (c)))
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#endif /* defined (FS_FAST) */