stdlib independence, fixes for calculator

Makefile

@@ -12,6 +12,7 @@ all:
 	$(CC) $(CFLAGS) -c stack.c
 	$(CC) $(CFLAGS) -c ops.c
 	$(CC) $(CFLAGS) -c variable.c
+	$(CC) $(CFLAGS) -c stdlib.c
 	$(AR) r libinterp.a *.o
 	@rm -f *.o
 	#$(CC) $(CFLAGS) shell.c -o shell -L. -l interp

builtins.c

@@ -2,7 +2,7 @@
 #include "stack.h"
 #include "shelpers.h"
 
-#include <stdlib.h>
+#include <memory.h>
 
 extern char *str_func;
 extern char *str_undef;

builtins.h

@@ -8,6 +8,8 @@
 
 void iload_core(interpreter *it);
 
+int ifunc_ret(interpreter *it);
+
 const func_t indent_up[IUP_COUNT];
 const func_t indent_down[IDOWN_COUNT];
 

memory.h

@@ -0,0 +1,8 @@
+#ifndef MEMORY_H_
+#define MEMORY_H_
+
+void *malloc(unsigned int);
+void *calloc(unsigned int, unsigned int);
+void free(void *);
+
+#endif // MEMORY_H_

parser.c

@@ -7,18 +7,19 @@
 
 #include <ctype.h>
 #include <stdlib.h>
-#include <stdio.h>
+#include <memory.h>
 #include <string.h>
 
 #define MAX_VARS  48
 #define MAX_STACK 16
 #define MAX_LINES 1000
 
+extern int atoi(const char *);
+extern float strtof(const char *, char **);
+
 char *str_func = "(func)";
 char *str_undef = "(undefined)";
 
-variable *idoexpr(interpreter *interp, const char *line);
-
 void iinit(interpreter *interp)
 {
 	interp->vars = (variable *)malloc(MAX_VARS * sizeof(variable));
@@ -222,7 +223,8 @@ int idoline(interpreter *interp, const char *line)
 			skipblank(line, eol, &offset);
 			continue;
 		}
-		ops[ooffset] = make_var(interp, line + offset, &next);
+		variable *v = make_var(interp, line + offset, &next);
+		ops[ooffset] = v;
 		if (ops[ooffset] == 0) {
 			fret = -4;
 			goto fail;
@@ -280,7 +282,8 @@ cont:
 		goto norun;
 
 	ops = (variable **)malloc(8 * sizeof(variable *));
-	memcpy(ops, interp->lines[interp->lnidx], 8 * sizeof(variable *));
+	for (uint8_t i = 0; i < 8; i++)
+		ops[i] = interp->lines[interp->lnidx][i];
 	uint32_t oldLnidx = interp->lnidx;
 	
 	// eval expressions

parser.h

@@ -32,5 +32,6 @@ variable *inew_float(interpreter *, const char *, float);
 void inew_cfunc(interpreter *, const char *, func_t);
 
 int idoline(interpreter *, const char *);
+variable *idoexpr(interpreter *interp, const char *line);
 
 #endif // PARSER_H_

script

@@ -1,18 +1,15 @@
-func divisible
-	if (arg1 == 0)
-		ret 0
-	end
-	ret (arg0 % arg1)
-end
+set a "Het\n"
+set b a
+print b
 
-set a 0
-set b 4
-do
-	set a (a + 1)
-	divisible a b > i
-	if (i == 0)
-		print a
-	end
-while (a < 100)
-
-print "All done!"
+#set a 0
+#do
+#	print "> "
+#	gets text
+#	set input "("
+#	concat input text
+#	concat input ")"
+#	expr input a
+#	print a
+#	print "\n"
+#while (1)

shell.c

@@ -1,4 +1,5 @@
 #include <parser.h>
+#include <builtins.h>
 
 #include "stack.h"
 
@@ -9,7 +10,7 @@
 int s_put(interpreter *it)
 {
 	char *s = igetarg_string(it, 0);
-	printf("%s\n", s);
+	printf("%s", s);
 	return 0;
 }
 
@@ -36,6 +37,29 @@ int s_type(interpreter *it)
 	return 0;
 }
 
+int input(interpreter *it)
+{
+	variable *v = igetarg(it, 0);
+	v->valtype = STRING;
+	v->svalue = malloc(128);
+	unsigned int unused;
+	getline(&v->svalue, &unused, stdin);
+	*strchr(v->svalue, '\n') = '\0';
+	return 0;
+}
+
+int concat(interpreter *it)
+{
+	variable *v = igetarg(it, 0);
+	char *s = igetarg_string(it, 1);
+	char *new = malloc(strlen(v->svalue) + strlen(s) + 1);
+	strcpy(new, v->svalue);
+	strcpy(new + strlen(v->svalue), s);
+	new[strlen(v->svalue) + strlen(s)] = 0;
+	v->svalue = new;
+	return 0;
+}
+
 int quit(interpreter *it)
 {
 	(void)it;
@@ -43,6 +67,21 @@ int quit(interpreter *it)
 	return 0;
 }
 
+int expr(interpreter *it)
+{
+	variable *v = igetarg(it, 0);
+	variable *r = igetarg(it, 1);
+	int len = strlen(v->svalue);
+	char *s = malloc(len + 1);
+	strcpy(s, v->svalue);
+	s[len] = 0;
+	variable *q = idoexpr(it, s);
+	r->valtype = q->valtype;
+	r->value = q->value;
+	r->svalue = q->svalue;
+	return 0;
+}
+
 int main(int argc, char **argv)
 {
 	interpreter interp;
@@ -62,6 +101,9 @@ int main(int argc, char **argv)
 	inew_cfunc(&interp, "print", s_put);
 	inew_cfunc(&interp, "tp", s_type);
 	inew_cfunc(&interp, "q", quit);
+	inew_cfunc(&interp, "gets", input);
+	inew_cfunc(&interp, "concat", concat);
+	inew_cfunc(&interp, "expr", expr);
 
 
 	char *line = 0;

shelpers.c

@@ -1,6 +1,6 @@
 #include "shelpers.h"
 
-#include <stdlib.h>
+#include <memory.h>
 #include <string.h>
 
 char *strclone(const char *s)

stdlib.c

@@ -0,0 +1,21 @@
+#include <stdarg.h>
+
+char *snprintf(char *buf, unsigned int max, const char *format, ...)
+{
+	(void)max;
+	va_list args;
+	va_start(args, format);
+
+	buf[0] = '0';
+	buf[1] = '\0';
+
+	va_end(args);
+	return buf;
+}
+
+float strtof(const char *s, char **endptr)
+{
+	(void)s;
+	(void)endptr;
+	return 0.0f;
+}

stdlib.h

@@ -0,0 +1,9 @@
+#ifndef STDLIB_H_
+#define STDLIB_H_
+
+char *snprintf(char *buf, unsigned int max, const char *format, ...);
+float strtof(const char *s, char **endptr);
+
+extern int atoi(const char *);
+
+#endif // STDLIB_H_

variable.c

@@ -1,12 +1,33 @@
 #include "variable.h"
 #include "parser.h"
 
-#include <stdio.h>
 #include <stdlib.h>
+#include <memory.h>
+#include <string.h>
+
+extern int atoi(const char *);
 
 extern char *str_undef;
 extern char *str_func;
 
+char *fixstring(char *s)
+{
+	int len = strlen(s);
+	char *n = malloc(len + 1);
+	int i, j;
+	for (i = 0, j = 0; s[i] != '\0'; i++, j++) {
+		if (s[i] == '\\') {
+			if (s[i + 1] == 'n')
+				n[j] = '\n';
+			i++;
+		} else {
+			n[j] = s[i];
+		}
+	}
+	n[j] = '\0';
+	return n;
+}
+
 variable *vmake(uint8_t fromc, uint8_t valtype, void *value)
 {
 	variable *v = (variable *)malloc(sizeof(variable));
@@ -18,7 +39,8 @@ variable *vmake(uint8_t fromc, uint8_t valtype, void *value)
 	switch (valtype) {
 	case STRING:
 		v->value = 0;
-		v->svalue = value;
+		v->svalue = fixstring(value);
+		free(value);
 		break;
 	case INTEGER:
 		INT(v) = (int32_t)value;