1 files changed, 95 insertions, 0 deletions
diff --git a/variable.c b/variable.c
new file mode 100644
index 0000000..f23390b
--- /dev/null
+++ b/variable.c
@@ -0,0 +1,95 @@
+/**
+ * @file variable.c
+ * Defines variable data structure, and provides functions for variable
+ * creation.
+ *
+ * Copyright (C) 2018 Clyne Sullivan
+ *
+ * This program 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "variable.h"
+#include "string.h"
+
+#include <ctype.h>
+#include <stdlib.h>
+
+variable *make_varf(variable *v, float f)
+{
+	if (v == 0) {
+		v = (variable *)malloc(sizeof(variable));
+		v->tmp = 1;
+	}
+	v->type = NUMBER;
+	v->value.f = f;
+	return v;
+}
+
+variable *make_vars(variable *v, const char *s)
+{
+	if (v == 0) {
+		v = (variable *)malloc(sizeof(variable));
+		v->tmp = 1;
+	}
+	v->type = STRING;
+	v->value.p = (uint32_t)strclone(s);
+	return v;
+}
+
+variable *varclone(variable *n)
+{
+	variable *v = (variable *)malloc(sizeof(variable));
+	v->tmp = 1;
+	v->type = n->type;
+	if (n->type == STRING)
+		v->value.p = (uint32_t)strclone((char *)n->value.p);
+	else
+		v->value.p = n->value.p;
+	return v;
+}
+
+variable *make_num(const char *text)
+{
+	int decimal = -1;
+	char valid = 0;
+
+	int i = 0;
+	if (text[0] == '-')
+		i++;
+	do {
+		if (text[i] == '.') {
+			if (decimal >= 0) {
+				valid = 0;
+				break;
+			}
+			decimal = i;
+		} else if (isdigit(text[i])) {
+			valid |= 1;
+		} else {
+			break;
+		}
+	} while (text[++i] != '\0');
+
+	if (valid == 0)
+		return 0;
+
+	char *buf = (char *)malloc(i + 1);
+	strncpy(buf, text, i);
+	buf[i] = '\0';
+
+	variable *v = make_varf(0, strtof(buf, 0));
+	free(buf);
+	return v;
+}
+