1 files changed, 177 insertions, 0 deletions
diff --git a/colm/string.cpp b/colm/string.cpp
new file mode 100644
index 00000000..d2452862
--- /dev/null
+++ b/colm/string.cpp
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+/*
+ *  Copyright 2007 Adrian Thurston <thurston@complang.org>
+ */
+
+/*  This file is part of Colm.
+ *
+ *  Colm is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ * 
+ *  Colm is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ * 
+ *  You should have received a copy of the GNU General Public License
+ *  along with Colm; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
+ */
+
+#include "pdarun.h"
+#include "bytecode.h"
+#include <assert.h>
+#include <string.h>
+
+Head *string_copy( Program *prg, Head *head )
+{
+	Head *result = 0;
+	if ( head != 0 ) {
+		if ( (char*)(head+1) == head->data )
+			result = string_alloc_new( prg, head->data, head->length );
+		else
+			result = string_alloc_const( prg, head->data, head->length );
+	}
+	return result;
+}
+
+void string_free( Program *prg, Head *head )
+{
+	if ( head != 0 ) {
+		if ( (char*)(head+1) == head->data ) {
+			/* Full string allocation. */
+			free( head );
+		}
+		else {
+			/* Just a string head. */
+			prg->kidPool.free( (Kid*)head );
+		}
+	}
+}
+
+const char *string_data( Head *head )
+{
+	if ( head == 0 )
+		return 0;
+	return head->data;
+}
+
+long string_length( Head *head )
+{
+	if ( head == 0 )
+		return 0;
+	return head->length;
+}
+
+void string_shorten( Head *head, long newlen )
+{
+	assert( newlen <= head->length );
+	head->length = newlen;
+}
+
+Head *init_str_space( long length )
+{
+	/* Find the length and allocate the space for the shared string. */
+	Head *head = (Head*) malloc( sizeof(Head) + length );
+	if ( head == 0 )
+		throw std::bad_alloc();
+
+	/* Init the header. */
+	head->data = (char*)(head+1);
+	head->length = length;
+
+	/* Save the pointer to the data. */
+	return head;
+}
+
+/* Create from a c-style string. */
+Head *string_alloc_new( Program *prg, const char *data, long length )
+{
+	/* Init space for the data. */
+	Head *head = init_str_space( length );
+
+	/* Copy in the data. */
+	memcpy( (head+1), data, length );
+
+	return head;
+}
+
+/* Create from a c-style string. */
+Head *string_alloc_const( Program *prg, const char *data, long length )
+{
+	/* Find the length and allocate the space for the shared string. */
+	Head *head = (Head*) prg->kidPool.allocate();
+
+	/* Init the header. */
+	head->data = data;
+	head->length = length;
+
+	return head;
+}
+
+Head *concat_str( Head *s1, Head *s2 )
+{
+	long s1Len = s1->length;
+	long s2Len = s2->length;
+
+	/* Init space for the data. */
+	Head *head = init_str_space( s1Len + s2Len );
+
+	/* Copy in the data. */
+	memcpy( (head+1), s1->data, s1Len );
+	memcpy( (char*)(head+1) + s1Len, s2->data, s2Len );
+
+	return head;
+}
+
+/* Compare two strings. If identical returns 1, otherwise 0. */
+Word cmp_string( Head *s1, Head *s2 )
+{
+	if ( s1->length < s2->length )
+		return -1;
+	else if ( s1->length > s2->length )
+		return 1;
+	else {
+		char *d1 = (char*)(s1->data);
+		char *d2 = (char*)(s2->data);
+		return memcmp( d1, d2, s1->length );
+	}
+}
+
+Word str_atoi( Head *str )
+{
+	int res = atoi( (char*)(str->data) );
+	return res;
+}
+
+Head *int_to_str( Program *prg, Word i )
+{
+	char data[20];
+	sprintf( data, "%ld", i );
+	return string_alloc_new( prg, data, strlen(data) );
+}
+
+Word str_uord16( Head *head )
+{
+	uchar *data = (uchar*)(head->data);
+	ulong res;
+	res =   (ulong)data[1];
+	res |= ((ulong)data[0]) << 8;
+	return res;
+}
+
+Word str_uord8( Head *head )
+{
+	uchar *data = (uchar*)(head->data);
+	ulong res = (ulong)data[0];
+	return res;
+}
+
+Head *make_literal( Program *prg, long offset )
+{
+	return string_alloc_const( prg,
+			prg->rtd->litdata[offset],
+			prg->rtd->litlen[offset] );
+}
+