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/*

    		 Crown Copyright (c) 1997

    This TenDRA(r) Computer Program is subject to Copyright

    owned by the United Kingdom Secretary of State for Defence

    acting through the Defence Evaluation and Research Agency

    (DERA).  It is made available to Recipients with a

    royalty-free licence for its use, reproduction, transfer

    to other parties and amendment for any purpose not excluding

    product development provided that any such use et cetera

    shall be deemed to be acceptance of the following conditions:-

        (1) Its Recipients shall ensure that this Notice is

        reproduced upon any copies or amended versions of it;

        (2) Any amended version of it shall be clearly marked to

        show both the nature of and the organisation responsible

        for the relevant amendment or amendments;

        (3) Its onward transfer from a recipient to another

        party shall be deemed to be that party's acceptance of

        these conditions;

        (4) DERA gives no warranty or assurance as to its

        quality or suitability for any purpose and DERA accepts

        no liability whatsoever in relation to any use to which

        it may be put.

*/

/**** cstring.c --- C string manipulation.

 *

 ** Author: Steve Folkes <smf@hermes.mod.uk>

 *

 **** Commentary:

 *

 * This file implements the C string manipulation facility specified in the

 * file "cstring.h".  See that file for more details.

 *

 **** Change Log:

 * $Log: cstring.c,v $

 * Revision 1.1.1.1  1998/01/17  15:57:17  release

 * First version to be checked into rolling release.

 *

 * Revision 1.2  1994/12/12  11:45:24  smf

 * Performing changes for 'CR94_178.sid+tld-update' - bringing in line with

 * OSSG C Coding Standards.

 *

 * Revision 1.1.1.1  1994/07/25  16:06:09  smf

 * Initial import of os-interface shared files.

 *

**/

/****************************************************************************/

#include "cstring.h"

#include "syntax.h"

/*--------------------------------------------------------------------------*/

CStringP

cstring_duplicate PROTO_N ((cstring))

		  PROTO_T (CStringP cstring)

{

    unsigned length = cstring_length (cstring);

    CStringP tmp    = ALLOCATE_VECTOR (char, length + 1);

    (void) strcpy (tmp, cstring);

    return (tmp);

}

CStringP

cstring_duplicate_prefix PROTO_N ((cstring, prefix))

			 PROTO_T (CStringP cstring X

				  unsigned prefix)

{

    unsigned length = cstring_length (cstring);

    if (length <= prefix) {

	CStringP tmp = ALLOCATE_VECTOR (char, length + 1);

	(void) strcpy (tmp, cstring);

	return (tmp);

    } else {

	CStringP tmp = ALLOCATE_VECTOR (char, prefix + 1);

	(void) memcpy ((GenericP) tmp, (GenericP) cstring, (SizeT) prefix);

	tmp [prefix] = '\0';

	return (tmp);

    }

}

unsigned

cstring_hash_value PROTO_N ((cstring))

		   PROTO_T (CStringP cstring)

{

    unsigned value = 0;

    while (*cstring) {

	value += ((unsigned) (*cstring ++));

    }

    return (value);

}

#ifdef FS_FAST

#undef cstring_length

#endif /* defined (FS_FAST) */

unsigned

cstring_length PROTO_N ((cstring))

	       PROTO_T (CStringP cstring)

{

    return ((unsigned) strlen (cstring));

}

#ifdef FS_FAST

#define cstring_length(s) ((unsigned) strlen (s))

#endif /* defined (FS_FAST) */

#ifdef FS_FAST

#undef cstring_equal

#endif /* defined (FS_FAST) */

BoolT

cstring_equal PROTO_N ((cstring1, cstring2))

	      PROTO_T (CStringP cstring1 X

		       CStringP cstring2)

{

    return (strcmp (cstring1, cstring2) == 0);

}

#ifdef FS_FAST

#define cstring_equal(s1, s2) (strcmp ((s1), (s2)) == 0)

#endif /* defined (FS_FAST) */

BoolT

cstring_ci_equal PROTO_N ((cstring1, cstring2))

		 PROTO_T (CStringP cstring1 X

			  CStringP cstring2)

{

    char c1;

    char c2;

    do {

	c1 = syntax_upcase (*cstring1 ++);

	c2 = syntax_upcase (*cstring2 ++);

    } while ((c1) && (c2) && (c1 == c2));

    return (c1 == c2);

}

BoolT

cstring_to_unsigned PROTO_N ((cstring, num_ref))

		    PROTO_T (CStringP  cstring X

			     unsigned *num_ref)

{

    unsigned number = 0;

    if (*cstring == '\0') {

	return (FALSE);

    }

    do {

	int value = syntax_value (*cstring);

	if ((value == SYNTAX_NO_VALUE) || (value >= 10) ||

	    (((UINT_MAX - (unsigned) value) / (unsigned) 10) < number)) {

	    return (FALSE);

	}

	number *= (unsigned) 10;

	number += (unsigned) value;

    } while (*++ cstring);

    *num_ref = number;

    return (TRUE);

}

#ifdef FS_FAST

#undef cstring_contains

#endif /* defined (FS_FAST) */

BoolT

cstring_contains PROTO_N ((cstring, c))

		 PROTO_T (CStringP cstring X

			  char     c)

{

    return (strchr (cstring, c) != NIL (CStringP));

}

#ifdef FS_FAST

#define cstring_contains(s, c) (strchr ((s), (c)) != NIL (CStringP))

#endif /* defined (FS_FAST) */

#ifdef FS_FAST

#undef cstring_find

#endif /* defined (FS_FAST) */

CStringP

cstring_find PROTO_N ((cstring, c))

	     PROTO_T (CStringP cstring X

		      char     c)

{

    return (strchr (cstring, c));

}

#ifdef FS_FAST

#define cstring_find(s, c) (strchr ((s), (c)))

#endif /* defined (FS_FAST) */

#ifdef FS_FAST

#undef cstring_find_reverse

#endif /* defined (FS_FAST) */

CStringP

cstring_find_reverse PROTO_N ((cstring, c))

		     PROTO_T (CStringP cstring X

			      char     c)

{

    return (strrchr (cstring, c));

}

#ifdef FS_FAST

#define cstring_find_reverse(s, c) (strrchr ((s), (c)))

#endif /* defined (FS_FAST) */