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/* Copyright (C) 1989, 1995 Aladdin Enterprises. All rights reserved.
This file is part of GNU Ghostscript.
GNU Ghostscript is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY. No author or distributor accepts responsibility to
anyone for the consequences of using it or for whether it serves any
particular purpose or works at all, unless he says so in writing. Refer to
the GNU General Public License for full details.
Everyone is granted permission to copy, modify and redistribute GNU
Ghostscript, but only under the conditions described in the GNU General
Public License. A copy of this license is supposed to have been given to
you along with GNU Ghostscript so you can know your rights and
responsibilities. It should be in a file named COPYING. Among other
things, the copyright notice and this notice must be preserved on all
copies.
Aladdin Enterprises is not affiliated with the Free Software Foundation or
the GNU Project. GNU Ghostscript, as distributed by Aladdin Enterprises,
does not depend on any other GNU software.
*/
/* zstring.c */
/* String operators */
#include "memory_.h"
#include "ghost.h"
#include "errors.h"
#include "gsutil.h"
#include "ialloc.h"
#include "iname.h"
#include "ivmspace.h"
#include "oper.h"
#include "store.h"
/* The generic operators (copy, get, put, getinterval, putinterval, */
/* length, and forall) are implemented in zgeneric.c. */
/* <int> string <string> */
int
zstring(register os_ptr op)
{ byte *sbody;
uint size;
check_int_leu(*op, max_string_size);
size = op->value.intval;
sbody = ialloc_string(size, "string");
if ( sbody == 0 )
return_error(e_VMerror);
make_string(op, a_all | icurrent_space, size, sbody);
memset(sbody, 0, size);
return 0;
}
/* <name> .namestring <string> */
private int
znamestring(register os_ptr op)
{ check_type(*op, t_name);
name_string_ref(op, op);
return 0;
}
/* <string> <pattern> anchorsearch <post> <match> -true- */
/* <string> <pattern> anchorsearch <string> -false- */
private int
zanchorsearch(register os_ptr op)
{ os_ptr op1 = op - 1;
uint size = r_size(op);
check_read_type(*op1, t_string);
check_read_type(*op, t_string);
if ( size <= r_size(op1) && !memcmp(op1->value.bytes, op->value.bytes, size) )
{ os_ptr op0 = op;
push(1);
*op0 = *op1;
r_set_size(op0, size);
op1->value.bytes += size;
r_dec_size(op1, size);
make_true(op);
}
else
make_false(op);
return 0;
}
/* <string> <pattern> search <post> <match> <pre> -true- */
/* <string> <pattern> search <string> -false- */
private int
zsearch(register os_ptr op)
{ os_ptr op1 = op - 1;
uint size = r_size(op);
uint count;
byte *pat;
byte *ptr;
byte ch;
check_read_type(*op1, t_string);
check_read_type(*op, t_string);
if ( size > r_size(op1) ) /* can't match */
{ make_false(op);
return 0;
}
count = r_size(op1) - size;
ptr = op1->value.bytes;
if ( size == 0 )
goto found;
pat = op->value.bytes;
ch = pat[0];
do
{ if ( *ptr == ch && (size == 1 || !memcmp(ptr, pat, size)) )
goto found;
ptr++;
}
while ( count-- );
/* No match */
make_false(op);
return 0;
found: op->tas.type_attrs = op1->tas.type_attrs;
op->value.bytes = ptr;
r_set_size(op, size);
push(2);
op[-1] = *op1;
r_set_size(op - 1, ptr - op[-1].value.bytes);
op1->value.bytes = ptr + size;
r_set_size(op1, count);
make_true(op);
return 0;
}
/* <obj> <pattern> .stringmatch <bool> */
private int
zstringmatch(register os_ptr op)
{ os_ptr op1 = op - 1;
bool result;
check_read_type(*op, t_string);
switch ( r_type(op1) )
{
case t_string:
check_read(*op1);
goto cmp;
case t_name:
name_string_ref(op1, op1); /* can't fail */
cmp: result = string_match(op1->value.const_bytes, r_size(op1),
op->value.const_bytes, r_size(op),
NULL);
break;
default:
result = (r_size(op) == 1 && *op->value.bytes == '*');
}
make_bool(op1, result);
pop(1);
return 0;
}
/* ------ Initialization procedure ------ */
BEGIN_OP_DEFS(zstring_op_defs) {
{"2anchorsearch", zanchorsearch},
{"1.namestring", znamestring},
{"2search", zsearch},
{"1string", zstring},
{"2.stringmatch", zstringmatch},
END_OP_DEFS(0) }
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