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first commit of the recode

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70% of the code was re-writter from scratch
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ALittlePatate
2024-01-18 16:01:04 +01:00
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the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

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SRC = pasm.c \
file_utils.c \
interpreter_states.c \
instructions.c \
api.c
OBJ = $(SRC:.c=.o)
NAME = pasm
CFLAGS = -Wall -Wextra -Wpedantic -Iinclude
CLIBS =
all: $(NAME)
lib: $(OBJ)
ar rc lib$(NAME).a $(OBJ)
$(NAME): fclean
$(NAME): lib
$(NAME): CLIBS += lib$(NAME).a
$(NAME):
gcc tests/interpreter.c $(CFLAGS) $(CLIBS) -o $(NAME)
interpreter: $(NAME)
debug: fclean
debug: CFLAGS += -DDEBUG -g3
debug: $(NAME)
clean:
rm -f $(OBJ)
cd tests && $(MAKE) clean
fclean: clean
rm -f $(NAME)
find . -name "lib$(NAME).a" -delete
cd tests && $(MAKE) fclean
re: fclean
re: $(NAME)
.PHONY : all $(NAME) clean fclean re interpreter lib debug

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# pasm
PASM is a Scripting language that i made for fun with a few constraints :
- the interpreter should be as small as possible and written without the CRT (currently 17ko WITH CRT)
- the language should be able to call Windows API's
PASM is meant for being used in C2 agents as its interpreter is small.<br>
It can be used with an interpreter to execute local files or as a library in another program to execute files or directly code inside buffers, see [Usage](#Usage).<br>
# What pasm is not
PASM is not a language that you daily use, it is not meant for big projects but rather for scripting using existing API (here the Windows API's but it can get extended).
# Current state
PASM is in a working state, see [code examples](#code-examples).
The interpreter works for linux as well, but some API's are Windows only (for now).
TODO :
- get rid of the CRT (so we can get a smaller PE)
# Documentation
The documentation is available [here](https://github.com/ALittlePatate/pasm/blob/main/docs/documentation.md), it *should* cover everything you have to know before writing scripts.
# Usage
## Interpreter
```
make interpreter
pasm.exe code.pasm
```
## As a library
```
make lib
```
Then link the library to your program, see [this example](https://github.com/ALittlePatate/pasm/blob/main/tests/lib_use.c).<br>
# Code examples :
- [functions test](https://github.com/ALittlePatate/pasm/blob/main/examples/test.pasm)

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#include "api.h"
#include "interpreter_states.h"
#ifdef _WIN32 //windows only apis
#include <Windows.h>
#endif
#include <stdio.h>
void api_put() {
int mode = state->STACK[state->STACK_IDX--]; // 1 for char, 2 for num
if (mode != 1 && mode != 2) return;
if (mode == 1) {
char c = state->STACK[state->STACK_IDX--];
if (c == '\0') c = ' ';
printf("%c", c); //using printf and not write because of the buffer
}
else {
printf("%d", state->STACK[state->STACK_IDX--]);
}
}
void api_getasynckeystate() {
#ifdef _WIN32
eax = GetAsyncKeyState(state->STACK[STACK_IDX--]);
#else
state->STACK_IDX--;
state->registers->eax = 1;
#endif
}

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#pragma once
#include "instructions.h"
void api_put();
void api_getasynckeystate();
static const command_t api_map[] = {
{.command = "put", .fptr = api_put},
{.command = "GetAsyncKeyState", .fptr = api_getasynckeystate},
{.command = NULL, .fptr = NULL}
};

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# Docs
This is the documentation for the PASM scripting language. <br>
Please note it is still in a very early stages so a lot of features you'd except in a scripting language like this one may not be present at the moment.<br>
For more informations please read the [readme](https://github.com/ALittlePatate/pasm/blob/main/README.md).
# Table of Contents
1. [Creating a script](#creating-a-script)<br>
a. [Scripts structure](#scripts-structure)<br>
b. [Registers](#registers)<br>
c. [Syntax](#syntax)<br>
c bis. [Note about return](#note-about-return)<br>
d. [Calling APIs](#calling-apis)<br>
2. [Errors](#errors)<br>
3. [Debugging](#debugging)<br>
4. [Running a script](#running-a-script)<br>
5. [Contributing](#contributing)<br>
## Creating a script
The PASM interpreter will try to run any file even without the `.pasm` extension but for good practice it is good to only code inside of `.pasm` files.
### Scripts structure
Function are defined with a "label" (ex `main:`) to which you can jump (`jmp`) at any point.<br>
The execution always starts at the `main:` label.<br>
Labels must have been seen at least once during execution to be defined. Example :<br>
Bad :
```asm
settoa:
add a1, 65
ret
main:
mov a1, 0
jmp settoa
jmp printa1 ; printa1 is not defined
printa1:
push a1
call put
```
Good :
```asm
settoa:
add a1, 65
ret
main:
mov a1, 0
jmp settoa
printa1:
push a1
call put
jmp printa1 ; will print "A" indefinitely
```
Please note that the execution will ignore labels, thus in this example printa1 will be executed even before the jump (`jmp`) occurs.
### Registers
There are in total 9 multi purpose registers you can use : `a1` to `a9`.<br>
The `eax` register can be used like any other register but it is meant for holding return values can be overwritten by API calls (see [#Calling APIs](#calling-apis)) and regular operands (see the table below).
### Syntax
The syntax is very close to x86 Intel Assembly. Here is a list of the operands and their effects :
| Operand | Effect | Sets EAX ? |
| :---: | :----: | :---: |
| **add** a1, a2 | Adds a2 to a1 | no |
| **sub** a1, a2 | Substract a2 from a1 | no |
| **mul** a1, a2 | Multiplies a2 with a1 | no |
| **div** a1, a2 | Divides a2 from a1 | no |
| **and** a1, a2 | Performs a bitwise AND between a1 and a2. Stores the result in eax. | yes |
| **xor** a1, a2 | Performs a XOR opration between a1 and a2. Stores the result in eax.| yes |
| **mov** a1, a2 | Moves the value stored in a2 in a1 | no |
| **cmp** a1, a2 | Compares a1 and a2. Sets the internal flags [last_cmp_code](https://github.com/ALittlePatate/pasm/blob/main/src/instructions.h#L6) | no |
| **je** foo | Jumps to `foo` if `cmp` returned `CMP_EQUAL` | no |
| **jne** foo | Jumps to `foo` if `cmp` didn't return `CMP_EQUAL` | no |
| **jb** foo | Jumps to `foo` if `cmp` returned `CMP_BELOW` | no |
| **jnb** foo | Jumps to `foo` if `cmp` didn't return `CMP_BELOW` | no |
| **ja** foo | Jumps to `foo` if `cmp` returned `CMP_ABOVE` | no |
| **jna** foo | Jumps to `foo` if `cmp` didn't return `CMP_ABOVE` | no |
| **jmp** foo | Jumps to `foo` | no |
| **ret** | Returns from the callee to the caller | no |
| **end** | Ends the program | no |
| **pop** a1 | Pops the first element of the stack into a1 | no |
| **push** 69 | Pushes the value 69 to the top of the stack | no |
| **call** put | Calls the `put` API | yes/no |
All the operands are case-sensitive, meaning that `ADD` will be an invalid operand.<br>
Please note that additional operands will be added in the future.
### Calling APIs
APIs can be added in the [api.c](https://github.com/ALittlePatate/pasm/blob/main/src/api.c) and [api.h](https://github.com/ALittlePatate/pasm/blob/main/src/api.h) files.
For the moment only `put` and `GetAsyncKeyState` can be called.<br>
APIs behave like normal functions and are called using the `call` operand.
## Errors
Here is a list of all the errors you can encounter and how to fix them :
* `invalid operand on line X` : you did not use an operand that was present in [the table](#syntax).
* `wrong number of arguments on line X` : you have more or less arguments needed for an operand, see [table](#syntax).
* `arg1/arg2 is invalid on line X` : the operand used can't work with the type of argument provided (register/number/char)
* `X is not a valid label/api` : you tried to jump (`jmp`) or `call` an undefined label or non-existing API. Check [Scripts structure](scripts-structure).
* `stack overflow on line X` : you pushed to many times without poping or you reached the recursion depth limit.
* `stack underflow on line X` : you poped to many times without pushing.
## Running a script
Usage : `pasm.exe script.pasm`.
## Contributing
Please message me over on discord at `_.patate` if you want me to add anything to the docs.<br>
Feel free to create a pull request as well.

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iterate:
add a1, 1
cmp a1, 42
jne iterate
ret
test:
push a
push 1
call put
ret
main:
mov a1, 0
jmp iterate
jmp test

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#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include "interpreter_states.h"
#define MAX_LINE 1024
size_t line_count = 0;
int read_script(const char *filename, char ***buf, size_t *lines) {
FILE *script = fopen(filename, "r");
if (script == NULL) {
fprintf(stderr, "Could not open %s.\n", filename);
return 1;
}
char line[MAX_LINE];
while (fgets(line, sizeof(line), script) != NULL) {
size_t length = strlen(line);
if (line[length - 1] == '\n') {
line[length - 1] = '\0';
}
char *line_copy = strdup(line);
char **temp = realloc(*buf, (line_count + 1) * sizeof(char*));
if (temp == NULL) {
fprintf(stderr, "Error allocating memory.\n");
return 1;
}
*buf = temp;
(*buf)[line_count++] = line_copy;
}
if (line_count == 0) {
fprintf(stderr, "%s is an empty file.\n", filename);
return 1;
}
*lines = line_count;
fclose(script);
return 0;
}
void free_script(char **buf) {
if (!buf)
return;
for (size_t i = 0; i < line_count; ++i)
if (buf[i])
free(buf[i]);
free(buf);
free_state();
}

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#pragma once
#include <stdlib.h>
int read_script(const char *filename, char ***buf, size_t *lines);
void free_script(char **buf);

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#pragma once
#include <stdlib.h>
#include <stdio.h>
int pasm_run_script(const char *filename, char **file, size_t lines, FILE* _fstream);

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#include "instructions.h"
#include "interpreter_states.h"
#include "api.h"
#include <string.h>
#include <stdlib.h>
bool is_reg(char* arg) {
return (strcmp(arg, "eax") == 0) || (((arg[0] == 'a' &&
('0' <= arg[1] && arg[1] <= '9'))) && strlen(arg) == 2);
}
bool is_num(char* arg) {
return (atoi(arg) != 0 || (arg[0] == '0' && strlen(arg) == 1));
}
bool check_args(s_arguments *args, int num_in_first, int num_args) {
int arg_num = strcmp(args->arg2, "") != 0;
arg_num += strcmp(args->arg1, "") != 0;
if (arg_num != num_args) {
state->last_check_args_code = WRONG_NUMBER;
return false;
}
if (!(((num_in_first && is_num(args->arg1)) || (is_reg(args->arg1))))) {
state->last_check_args_code = ARG1_WRONG;
return false;
}
if ((!is_num(args->arg2) && !is_reg(args->arg2))) {
state->last_check_args_code = ARG2_WRONG;
return false;
}
return true;
}
int* get_reg(char* reg_char) {
switch (reg_char[1]) {
case '1' :
return &state->registers->a1;
case '2' :
return &state->registers->a2;
case '3' :
return &state->registers->a3;
case '4' :
return &state->registers->a4;
case '5' :
return &state->registers->a5;
case '6' :
return &state->registers->a6;
case '7' :
return &state->registers->a7;
case '8' :
return &state->registers->a8;
case '9' :
return &state->registers->a9;
case 'a' : //eax
return &state->registers->eax;
default :
return NULL; //should never happen
}
}
int get_value(char* arg) {
int ret = 0;
if (is_reg(arg)) {
ret = *get_reg(arg);
}
else {
ret = atoi(arg);
}
return ret;
}
const command_t *find_command(const command_t *commands, char *func)
{
if (func == NULL)
return NULL;
for (int index = 0; commands[index].fptr != NULL; index += 1) {
if (strcmp(func, commands[index].command) == 0) {
return &commands[index];
}
}
return NULL;
}
void cmp() {
if (!check_args(state->args, 1, 2)) {
state->last_cmp_code = CMP_ERROR;
return;
}
int a1_ = get_value(state->args->arg1);
int a2_ = get_value(state->args->arg2);
if (a1_ == a2_) state->last_cmp_code = CMP_EQUAL;
else if (a1_ > a2_) state->last_cmp_code = CMP_ABOVE;
else if (a2_ > a1_) state->last_cmp_code = CMP_BELOW;
return;
}
int check_ret_stack() {
if (state->RET_STACK_IDX > STACK_SIZE) {
state->last_stack_code = OVERFLOW;
return 0;
}
if (state->RET_STACK_IDX < 0) {
state->last_stack_code = UNDERFLOW;
return 0;
}
return 1;
}
void ret() {
if (!check_ret_stack()) return;
if (state->RET_STACK[state->RET_STACK_IDX] == -1) {
state->should_exit = 1;
return;
}
state->curr_line = state->RET_STACK[state->RET_STACK_IDX--];
}
void jmp() {
if (state->RET_STACK_IDX != -1 && !check_ret_stack()) return;
if (strcmp(state->args->arg1, "return") == 0) {
ret();
return;
}
state->registers->eax = 0;
for (int i = 0; i < state->num_labels; i++) {
if (state->labels[i] == NULL) break;
if (strlen(state->labels[i]) - 1 != strlen(state->args->arg1))
continue;
if (strncmp(state->args->arg1, state->labels[i], strlen(state->labels[i]) - 1) == 0) {
state->RET_STACK[++state->RET_STACK_IDX] = state->curr_line;
state->curr_line = state->labels_values[i];
return;
}
}
state->last_jmp_code = 1;
return;
}
void jna() {
if (state->last_cmp_code != CMP_ABOVE) jmp();
}
void ja() {
if (state->last_cmp_code == CMP_ABOVE) jmp();
}
void jnb() {
if (state->last_cmp_code != CMP_BELOW) jmp();
}
void jb() {
if (state->last_cmp_code == CMP_BELOW) jmp();
}
void jne() {
if (state->last_cmp_code != CMP_EQUAL) jmp();
}
void je() {
if (state->last_cmp_code == CMP_EQUAL) jmp();
}
void sub() {
if (!check_args(state->args, 0, 2)) {
return;
}
*get_reg(state->args->arg1) -= get_value(state->args->arg2);
}
void add() {
if (!check_args(state->args, 0, 2)) {
return;
}
*get_reg(state->args->arg1) += get_value(state->args->arg2);
}
void mul() {
if (!check_args(state->args, 0, 2)) {
return;
}
*get_reg(state->args->arg1) *= get_value(state->args->arg2);
}
void _div() {
if (!check_args(state->args, 0, 2)) {
return;
}
*get_reg(state->args->arg1) /= get_value(state->args->arg2);
}
void mov() {
if (!check_args(state->args, 0, 2)) {
return;
}
*get_reg(state->args->arg1) = get_value(state->args->arg2);
}
void call() {
const command_t* com = find_command(api_map, state->args->arg1);
if (com != NULL) {
com->fptr();
}
else {
state->last_jmp_code = 1;
}
}
void push() {
if (state->STACK_IDX == STACK_SIZE) { //stack overflow
state->last_stack_code = OVERFLOW;
return;
}
int value = get_value(state->args->arg1);
if (value == 0) {
if (state->args->arg1[0] == '\\') {
switch (state->args->arg1[1]) {
case 'n':
value = (int)'\n';
break;
case 't':
value = (int)'\t';
break;
case 'r':
value = (int)'\r';
break;
default:
break;
}
}
else {
value = (int)state->args->arg1[0];
}
}
state->STACK[++state->STACK_IDX] = value;
}
void pop() {
if (!is_reg(state->args->arg1)) {
state->last_check_args_code = ARG1_WRONG;
return;
}
if (state->STACK_IDX == -1) { //stack underflow
state->last_stack_code = UNDERFLOW;
return;
}
*get_reg(state->args->arg1) = state->STACK[state->STACK_IDX--];
}
void _and() {
if (!check_args(state->args, 1, 2)) {
return;
}
state->registers->eax = get_value(state->args->arg1) & get_value(state->args->arg2);
}
void _xor() {
if (!check_args(state->args, 1, 2)) {
return;
}
state->registers->eax = get_value(state->args->arg1) ^ get_value(state->args->arg2);
}
void end() {
state->should_exit = 1;
}

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#pragma once
#include <stdbool.h>
#include <stdlib.h>
#include "interpreter_states.h"
typedef struct command_s {
char *command;
void (*fptr)();
} command_t;
bool is_reg(char* arg);
bool check_args(s_arguments *args, int num_in_first, int num_args);
int* get_reg(char* arg);
void add();
void sub();
void mul();
void _div();
void mov();
void cmp();
void je();
void jne();
void jb();
void jnb();
void ja();
void jna();
void jmp();
void ret();
void pop();
void push();
void call();
void _and();
void _xor();
void end();
static const command_t command_map[] = {
{.command = "add", .fptr = add},
{.command = "sub", .fptr = sub},
{.command = "mul", .fptr = mul},
{.command = "div", .fptr = _div},
{.command = "mov", .fptr = mov},
{.command = "cmp", .fptr = cmp},
{.command = "je", .fptr = je},
{.command = "jne", .fptr = jne},
{.command = "jb", .fptr = jb},
{.command = "jnb", .fptr = jnb},
{.command = "ja", .fptr = ja},
{.command = "jna", .fptr = jna},
{.command = "jmp", .fptr = jmp},
{.command = "ret", .fptr = ret},
{.command = "pop", .fptr = pop},
{.command = "push", .fptr = push},
{.command = "call", .fptr = call},
{.command = "and", .fptr = _and},
{.command = "xor", .fptr = _xor},
{.command = "end", .fptr = end},
{.command = NULL, .fptr = NULL}
};
const command_t *find_command(const command_t *commands, char *func);

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#include "interpreter_states.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
s_state *state = NULL;
int init_state() {
state = malloc(sizeof(s_state));
if (state == NULL)
return 1;
memset(state, 0, sizeof(s_state));
state->registers = malloc(sizeof(s_registers));
if (state->registers == NULL) {
free(state);
return 1;
}
memset(state->registers, 0, sizeof(s_registers));
state->args = malloc(sizeof(s_arguments));
if (state->args == NULL) {
free(state);
free(state->registers);
return 1;
}
state->args->arg1 = malloc(sizeof(char) * MAX_ARG_SIZE);
state->args->arg2 = malloc(sizeof(char) * MAX_ARG_SIZE);
if (state->args->arg1 == NULL || state->args->arg2 == NULL) {
free(state);
free(state->registers);
return 1;
}
memset(state->args->arg1, 0, sizeof(char) * MAX_ARG_SIZE);
memset(state->args->arg2, 0, sizeof(char) * MAX_ARG_SIZE);
state->labels_values = malloc(sizeof(int) * MAX_LABELS);
if (state->labels_values == NULL) {
free(state);
free(state->registers);
free(state->args->arg1);
free(state->args->arg2);
return 1;
}
memset(state->labels_values, 0, sizeof(int) * MAX_LABELS);
memset(state->RET_STACK, -1, sizeof(int) * STACK_SIZE);
memset(state->STACK, 0, sizeof(int) * STACK_SIZE);
state->RET_STACK_IDX = -1;
state->STACK_IDX = -1;
state->last_stack_code = STACK_OK;
state->last_check_args_code = OK;
return 0;
}
void free_state() {
for (int i = 0; i < state->num_labels; i++) {
if (state->labels[i])
free(state->labels[i]);
}
free(state->labels);
free(state->labels_values);
free(state->registers);
free(state->args->arg1);
free(state->args->arg2);
free(state->args);
free(state);
}
void set_exit_state(int exit_state) {
state->should_exit = exit_state;
}
int get_exit_state() {
return state->should_exit;
}
LABEL_ERR add_label(char *label, int line) {
if (label == NULL)
return LABEL_INVALID;
if (state->num_labels == MAX_LABELS)
return LABEL_MAX;
for (int i = 0; i < state->num_labels; i++)
if (strcmp(label, state->labels[i]) == 0)
return LABEL_ALREADY_EXISTS;
char *line_copy = strdup(label);
if (line_copy == NULL) {
fprintf(fstream, "Error allocating memory.\n");
return LABEL_ERROR;
}
char **temp = realloc(state->labels, (state->num_labels + 1) * sizeof(char*));
if (temp == NULL) {
fprintf(fstream, "Error allocating memory.\n");
return LABEL_ERROR;
}
state->labels = temp;
state->labels_values[state->num_labels] = line;
state->labels[state->num_labels++] = line_copy;
return LABEL_OK;
}
char *extract_arg(char *ptr, int a) {
char *arg = 0;
char *ptr2 = strstr(ptr, ";");
if (ptr2)
ptr2[0] = '\0';
if (a == 0) {
arg = strtok(ptr, ",");
} else {
arg = strtok(NULL, ",");
}
if (arg == NULL)
return NULL;
if (arg[0] == ' ')
arg++;
ptr2 = strstr(arg, " ");
if (ptr2)
ptr2[0] = '\0';
return arg;
}
int parse_arguments(char *line) {
strcpy(state->args->arg1, "");
strcpy(state->args->arg2, "");
char *line_cpy = strdup(line);
char *ptr = strstr(line_cpy, " ");
char *arg = 0;
if (!ptr) {
free(line_cpy);
return 0;
}
if ((arg = extract_arg(ptr, 0)) == NULL) {
free(line_cpy);
return 0;
}
strcpy(state->args->arg1, arg);
if ((arg = extract_arg(ptr, 1)) == NULL) {
free(line_cpy);
return 0;
}
strcpy(state->args->arg2, arg);
free(line_cpy);
return 0;
}

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#pragma once
#include <stdio.h>
#define MAX_LABELS 256
#define MAX_ARG_SIZE 25
#define STACK_SIZE 50
extern FILE *fstream;
typedef enum cmp_return_codes {
CMP_ERROR = -1, //unused
CMP_EQUAL,
CMP_BELOW,
CMP_ABOVE,
} cmp_return_codes;
typedef enum check_args_codes {
ARG1_WRONG,
ARG2_WRONG,
WRONG_NUMBER,
OK
} check_args_codes ;
typedef enum stack_codes {
OVERFLOW,
UNDERFLOW,
STACK_OK
} stack_codes;
typedef struct t_arguments {
char* arg1;
char* arg2;
} s_arguments;
typedef struct t_registers {
int a1, a2, a3, a4, a5, a6, a7, a8, a9, eax;
} s_registers;
typedef struct t_state {
int curr_line;
int num_labels;
char **labels;
int *labels_values;
s_arguments *args;
s_registers *registers;
int should_exit;
int RET_STACK[STACK_SIZE];
int RET_STACK_IDX;
int STACK_IDX;
int STACK[STACK_SIZE];
int last_jmp_code;
stack_codes last_stack_code;
cmp_return_codes last_cmp_code;
check_args_codes last_check_args_code;
} s_state;
extern s_state *state;
typedef enum E_LABEL_ERR {
LABEL_OK,
LABEL_ALREADY_EXISTS,
LABEL_INVALID,
LABEL_MAX,
LABEL_ERROR
} LABEL_ERR;
int init_state();
void free_state();
void set_exit_state(int exit_state);
int get_exit_state();
LABEL_ERR add_label(char *label, int line);
int parse_arguments(char *args);

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#include <stdio.h>
#include <string.h>
#include "file_utils.h"
#include "interpreter_states.h"
#include "instructions.h"
FILE *fstream = NULL;
void show_error(size_t line, char *line_) {
int wrote = fprintf(fstream, "%ld| ", line + 1);
fprintf(fstream, "%s\n", line_);
fprintf(fstream, "%*s\n", wrote + 1, "^");
fprintf(fstream, "%*s\n", wrote + 1, "|");
for (int i = 0; i < wrote; i++)
fprintf(fstream, " ");
}
void show_states() {
printf("\n\n--------PASM STATE--------\n");
printf("a1: %-3d | ", state->registers->a1);
printf("a2: %-3d | ", state->registers->a2);
printf("a3: %-3d\n", state->registers->a3);
printf("a4: %-3d | ", state->registers->a4);
printf("a5: %-3d | ", state->registers->a5);
printf("a6: %-3d\n", state->registers->a6);
printf("a7: %-3d | ", state->registers->a7);
printf("a8: %-3d | ", state->registers->a8);
printf("a9: %-3d\n", state->registers->a9);
printf("eax: %-3d\n", state->registers->eax);
}
int check_errors(char *line) {
if (state->last_check_args_code != OK) {
show_error(state->curr_line, line);
switch ((int)state->last_check_args_code) {
case WRONG_NUMBER :
fprintf(fstream, "wrong number of arguments on line %d\n", state->curr_line + 1);
break;
case ARG1_WRONG :
fprintf(fstream, "arg1 is invalid on line %d\n", state->curr_line + 1);
break;
case ARG2_WRONG :
fprintf(fstream, "arg2 is invalid on line %d\n", state->curr_line + 1);
break;
}
return 1;
}
if (state->last_jmp_code) {
show_error(state->curr_line, line);
fprintf(fstream, "%s is not a valid label/api", state->args->arg1);
return 1;
}
if (state->last_stack_code != STACK_OK) {
show_error(state->curr_line, line);
fprintf(fstream, "stack %s on line %d",
state->last_stack_code == OVERFLOW ? "overflow" : "underflow", state->curr_line + 1);
return 1;
}
return 0;
}
int pasm_run_script(const char *filename, char **file, size_t lines, FILE *_fstream) {
fstream = _fstream;
if (filename && read_script(filename, &file, &lines) == 1)
return 1;
if (init_state() == 1) {
fprintf(fstream, "Failed to initialize the interpreter.\n");
free_script(file);
return 1;
}
int found_main = 0;
for (state->curr_line = 0; state->curr_line < (int)lines && get_exit_state() == 0 ; ++state->curr_line) {
char *line = strdup(file[state->curr_line]);
if (line[0] == ';' || line[0] == '\0') {
free(line);
continue;
}
const command_t *com = find_command(command_map, strtok(line, " "));
if (com == NULL || com->fptr == NULL) {
if (file[state->curr_line][strlen(line) - 1] != ':') {
show_error(state->curr_line, file[state->curr_line]);
fprintf(fstream, "%s \"%s\"\n", "unknown expression", strtok(file[state->curr_line], " "));
set_exit_state(-1);
free(line);
break;
}
add_label(line, state->curr_line);
if (!found_main && strcmp(line, "main:") == 0)
found_main = 1;
free(line);
continue;
}
parse_arguments(file[state->curr_line]);
if (found_main)
com->fptr();
if (check_errors(file[state->curr_line])) {
set_exit_state(-1);
break;
}
free(line);
}
int ret_code = get_exit_state();
#ifdef DEBUG
show_states();
#endif
free_script(file);
return ret_code;
}

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SRC = lib_use.c
OBJ = $(SRC:.c=.o)
NAME = lib_use
CFLAGS = -Wall -Wextra -Wpedantic -I../include
CLIBS = ../libpasm.a
all: $(NAME)
$(NAME): $(OBJ)
cd .. && $(MAKE) lib
gcc $(SRC) $(CFLAGS) $(CLIBS) -o $(NAME)
clean:
rm -f $(OBJ)
fclean: clean
rm -f $(NAME)
re: fclean
re: $(NAME)
.PHONY : all $(NAME) clean fclean re

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tests/interpreter.c Normal file
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#include "../include/pasm.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
int main(int argc, char **argv) {
if (argc != 2 || strcmp(argv[1], "-h") == 0) {
fprintf(stderr, "Usage : %s filename\n", argv[0]);
return 1;
}
return pasm_run_script(argv[1], 0, 0, stderr);
}

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#include "../include/pasm.h"
int main(void) {
char output[1024] = {0};
FILE *memfile = fmemopen(output, sizeof(output), "w");
pasm_run_script("../examples/test.pasm", 0, 0, memfile);
fclose(memfile);
printf("%s", output);
return 0;
}