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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 1.3  1998/03/17  11:38:15  release
 * Missing ';'.
 *
 * Revision 1.2  1998/03/16  11:26:34  release
 * Modifications prior to version 4.1.2.
 *
 * Revision 1.1.1.1  1998/01/17  15:57:45  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);
}

BoolT
cstring_starts PROTO_N ((cstring, s))
               PROTO_T (CStringP cstring X
                        CStringP s)
{
    return (strncmp (cstring, s, strlen (s)) == 0);
}

#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) */

CStringP
cstring_find_basename PROTO_N ((cstring))
                      PROTO_T (CStringP cstring)
{
    CStringP bstring = cstring_find_reverse (cstring, '/');
    if (bstring != NIL (CStringP)) {
        cstring = bstring + 1;
    }
    return (cstring);
}