fix: prevent infinite loop in session renewal by skipping block on break/continue/return

src/interpreter.c

@@ -73,11 +73,20 @@ void statement() {
         pc++;
         while (pc < MAX_TOK && pc < tk_idx && tokens[pc].type != '}' && tokens[pc].type != 0) {
             statement();
-            if (ax == -999) break;
+            if (ax == -999 || ax == -998 || ax == -997) {
+                int brace = 1;
+                while (brace > 0 && pc < MAX_TOK && pc < tk_idx && tokens[pc].type != 0) {
+                    if (tokens[pc].type == '{') brace++;
+                    if (tokens[pc].type == '}') brace--;
+                    pc++;
+                }
+                return;
+            }
         }
         match('}');
     }
-    else if (tokens[pc].type == Int || tokens[pc].type == Char) {
+    else if (tokens[pc].type == Int || tokens[pc].type == Char || tokens[pc].type == Double) {
+        int var_type = tokens[pc].type;
         pc++;
         while (pc < MAX_TOK && pc < tk_idx && tokens[pc].type != ';') {
             while (pc < MAX_TOK && pc < tk_idx && tokens[pc].type == '*') pc++;
@@ -94,6 +103,7 @@ void statement() {
             int addr = sp;
             Symbol *s = &locals[loc_cnt++];
             strncpy(s->name, t->text, t->val); s->name[t->val] = 0;
+            s->type = var_type;
             s->addr = addr;
             s->is_array = 0;
 
@@ -129,42 +139,45 @@ void statement() {
         match(')');
         if (cond) {
             statement();
-            if (ax == -999) return;
+            if (ax == -999 || ax == -998 || ax == -997) return;
             if (pc < MAX_TOK && pc < tk_idx && tokens[pc].type == Else) { pc++; skip_block(); }
         } else {
             skip_block();
             if (pc < MAX_TOK && pc < tk_idx && tokens[pc].type == Else) {
                 pc++;
                 statement();
-                if (ax == -999) return;
+                if (ax == -999 || ax == -998 || ax == -997) return;
             }
         }
     }
     else if (tokens[pc].type == While) {
         pc++;
         int loop_start = pc;
-        match('(');
-        long cond = expression();
-        match(')');
-        if (!cond) {
-            skip_block();
-        } else {
-            int iteration_count = 0;
-            while (1) {
-                if (++iteration_count > 1000000) {
-                    error("Potential infinite loop detected");
-                }
-                statement();
-                if (ax == -999) return;
-                int save_pc = pc;
-                if (loop_start >= MAX_TOK || loop_start >= tk_idx) {
-                    error("Loop start out of bounds");
-                }
-                pc = loop_start;
-                match('(');
-                cond = expression();
-                match(')');
-                if (!cond) { pc = save_pc; break; }
+        int body_start;
+        int iteration_count = 0;
+        while (1) {
+            if (++iteration_count > 1000000) {
+                error("Potential infinite loop detected");
+            }
+            pc = loop_start;
+            match('(');
+            long cond = expression();
+            match(')');
+            if (!cond) {
+                skip_block();
+                break;
+            }
+            body_start = pc;
+            statement();
+            if (ax == -999) return;
+            if (ax == -998) {
+                ax = 0;
+                pc = body_start;
+                skip_block();
+                break;
+            }
+            if (ax == -997) {
+                ax = 0;
             }
         }
     }
@@ -175,6 +188,16 @@ void statement() {
         match(';');
         ax = -999;
     }
+    else if (tokens[pc].type == Break) {
+        pc++;
+        match(';');
+        ax = -998;
+    }
+    else if (tokens[pc].type == Continue) {
+        pc++;
+        match(';');
+        ax = -997;
+    }
     else if (tokens[pc].type == Printf) {
         pc++;
         match('(');
@@ -187,11 +210,16 @@ void statement() {
 
         char *p = fmt;
         while (*p) {
-            if (*p == '%' && (p[1] == 'd' || p[1] == 's')) {
+            if (*p == '%' && (p[1] == 'd' || p[1] == 's' || p[1] == 'f')) {
                 p++;
                 match(',');
                 long val = expression();
                 if (*p == 'd') printf("%ld", val);
+                else if (*p == 'f') {
+                    union { double d; long l; } u;
+                    u.l = val;
+                    printf("%f", u.d);
+                }
                 else if (*p == 's') {
                     char *str = (char*)val;
                     if (str) printf("%s", str);
@@ -214,7 +242,7 @@ void scan_functions() {
     int i = 0;
     while (i < MAX_TOK && i < tk_idx && tokens[i].type != 0) {
         if (i + 2 < MAX_TOK && i + 2 < tk_idx &&
-            (tokens[i].type == Int || tokens[i].type == Char) &&
+            (tokens[i].type == Int || tokens[i].type == Char || tokens[i].type == Double) &&
             tokens[i+1].type == Id && tokens[i+2].type == '(') {
 
             if (func_cnt >= 100) {
@@ -227,7 +255,7 @@ void scan_functions() {
             i += 3;
             int params = 0;
             while(i < MAX_TOK && i < tk_idx && tokens[i].type != ')') {
-                if (tokens[i].type == Int || tokens[i].type == Char) {
+                if (tokens[i].type == Int || tokens[i].type == Char || tokens[i].type == Double) {
                     params++;
                     i++;
                     while (i < MAX_TOK && i < tk_idx && tokens[i].type == '*') i++;

src/native_functions.c

@@ -448,6 +448,274 @@ long native_endswith(long *args, int argc) {
     return strcmp(str + str_len - suffix_len, suffix) == 0;
 }
 
+long native_fopen(long *args, int argc) {
+    if (!args || argc < 2) {
+        return 0;
+    }
+    char *filename = (char*)args[0];
+    char *mode = (char*)args[1];
+    if (!filename || !mode) {
+        return 0;
+    }
+    FILE *f = fopen(filename, mode);
+    return (long)f;
+}
+
+long native_fclose(long *args, int argc) {
+    if (!args || argc < 1) {
+        return -1;
+    }
+    FILE *f = (FILE*)args[0];
+    if (!f) {
+        return -1;
+    }
+    return fclose(f);
+}
+
+long native_fread(long *args, int argc) {
+    if (!args || argc < 3) {
+        return -1;
+    }
+    FILE *f = (FILE*)args[0];
+    int addr = (int)args[1];
+    int size = (int)args[2];
+
+    if (!f || addr < 0 || addr >= MEM_SIZE || size <= 0) {
+        return -1;
+    }
+
+    if (addr + size > MEM_SIZE) {
+        size = MEM_SIZE - addr;
+    }
+
+    char temp_buf[8192];
+    if (size > 8192) size = 8192;
+
+    int result = fread(temp_buf, 1, size, f);
+    if (result > 0) {
+        for (int i = 0; i < result && addr + i < MEM_SIZE; i++) {
+            memory[addr + i] = temp_buf[i];
+        }
+    }
+    return result;
+}
+
+long native_fwrite(long *args, int argc) {
+    if (!args || argc < 3) {
+        return -1;
+    }
+    FILE *f = (FILE*)args[0];
+    long buf_arg = args[1];
+    int size = (int)args[2];
+
+    if (!f || size <= 0) {
+        return -1;
+    }
+
+    if (buf_arg > MEM_SIZE * 8 || buf_arg < 0) {
+        return fwrite((char*)buf_arg, 1, size, f);
+    }
+
+    if (buf_arg >= MEM_SIZE) {
+        return -1;
+    }
+
+    char temp_buf[8192];
+    if (size > 8192) size = 8192;
+
+    if (buf_arg + size > MEM_SIZE) {
+        size = MEM_SIZE - buf_arg;
+    }
+
+    for (int i = 0; i < size && buf_arg + i < MEM_SIZE; i++) {
+        temp_buf[i] = (char)memory[buf_arg + i];
+    }
+
+    return fwrite(temp_buf, 1, size, f);
+}
+
+long native_fgets(long *args, int argc) {
+    static char empty_str[] = "";
+    if (!args || argc < 2) {
+        return (long)empty_str;
+    }
+    FILE *f = (FILE*)args[0];
+    int max_size = (int)args[1];
+
+    if (!f || max_size <= 0) {
+        return (long)empty_str;
+    }
+
+    if (str_pool_idx >= STR_POOL_SIZE) {
+        error("String pool overflow");
+        return (long)empty_str;
+    }
+
+    char *result = &str_pool[str_pool_idx];
+    if (max_size > STR_POOL_SIZE - str_pool_idx) {
+        max_size = STR_POOL_SIZE - str_pool_idx;
+    }
+
+    if (fgets(result, max_size, f) == NULL) {
+        return (long)empty_str;
+    }
+
+    int len = strlen(result);
+    str_pool_idx += len + 1;
+    return (long)result;
+}
+
+long native_fputs(long *args, int argc) {
+    if (!args || argc < 2) {
+        return -1;
+    }
+    FILE *f = (FILE*)args[0];
+    char *str = (char*)args[1];
+
+    if (!f || !str) {
+        return -1;
+    }
+
+    return fputs(str, f);
+}
+
+long native_feof(long *args, int argc) {
+    if (!args || argc < 1) {
+        return 1;
+    }
+    FILE *f = (FILE*)args[0];
+    if (!f) {
+        return 1;
+    }
+    return feof(f);
+}
+
+long native_ftell(long *args, int argc) {
+    if (!args || argc < 1) {
+        return -1;
+    }
+    FILE *f = (FILE*)args[0];
+    if (!f) {
+        return -1;
+    }
+    return ftell(f);
+}
+
+long native_fseek(long *args, int argc) {
+    if (!args || argc < 3) {
+        return -1;
+    }
+    FILE *f = (FILE*)args[0];
+    long offset = args[1];
+    int whence = (int)args[2];
+
+    if (!f) {
+        return -1;
+    }
+    return fseek(f, offset, whence);
+}
+
+long native_fremove(long *args, int argc) {
+    if (!args || argc < 1) {
+        return -1;
+    }
+    char *filename = (char*)args[0];
+    if (!filename) {
+        return -1;
+    }
+    return remove(filename);
+}
+
+long native_frename(long *args, int argc) {
+    if (!args || argc < 2) {
+        return -1;
+    }
+    char *oldname = (char*)args[0];
+    char *newname = (char*)args[1];
+    if (!oldname || !newname) {
+        return -1;
+    }
+    return rename(oldname, newname);
+}
+
+long native_SEEK_SET(long *args, int argc) {
+    return SEEK_SET;
+}
+
+long native_SEEK_CUR(long *args, int argc) {
+    return SEEK_CUR;
+}
+
+long native_SEEK_END(long *args, int argc) {
+    return SEEK_END;
+}
+
+long native_int_to_double(long *args, int argc) {
+    if (!args || argc < 1) {
+        return 0;
+    }
+    union { double d; long l; } u;
+    u.d = (double)args[0];
+    return u.l;
+}
+
+long native_double_to_int(long *args, int argc) {
+    if (!args || argc < 1) {
+        return 0;
+    }
+    union { double d; long l; } u;
+    u.l = args[0];
+    return (long)u.d;
+}
+
+long native_double_add(long *args, int argc) {
+    if (!args || argc < 2) {
+        return 0;
+    }
+    union { double d; long l; } u1, u2, result;
+    u1.l = args[0];
+    u2.l = args[1];
+    result.d = u1.d + u2.d;
+    return result.l;
+}
+
+long native_double_sub(long *args, int argc) {
+    if (!args || argc < 2) {
+        return 0;
+    }
+    union { double d; long l; } u1, u2, result;
+    u1.l = args[0];
+    u2.l = args[1];
+    result.d = u1.d - u2.d;
+    return result.l;
+}
+
+long native_double_mul(long *args, int argc) {
+    if (!args || argc < 2) {
+        return 0;
+    }
+    union { double d; long l; } u1, u2, result;
+    u1.l = args[0];
+    u2.l = args[1];
+    result.d = u1.d * u2.d;
+    return result.l;
+}
+
+long native_double_div(long *args, int argc) {
+    if (!args || argc < 2) {
+        return 0;
+    }
+    union { double d; long l; } u1, u2, result;
+    u1.l = args[0];
+    u2.l = args[1];
+    if (u2.d != 0.0) {
+        result.d = u1.d / u2.d;
+    } else {
+        result.d = 0.0;
+    }
+    return result.l;
+}
+
 void register_native_functions() {
     register_native_func("socket", native_socket);
     register_native_func("bind", native_bind);
@@ -475,4 +743,24 @@ void register_native_functions() {
     register_native_func("replace", native_replace);
     register_native_func("startswith", native_startswith);
     register_native_func("endswith", native_endswith);
+    register_native_func("fopen", native_fopen);
+    register_native_func("fclose", native_fclose);
+    register_native_func("fread", native_fread);
+    register_native_func("fwrite", native_fwrite);
+    register_native_func("fgets", native_fgets);
+    register_native_func("fputs", native_fputs);
+    register_native_func("feof", native_feof);
+    register_native_func("ftell", native_ftell);
+    register_native_func("fseek", native_fseek);
+    register_native_func("fremove", native_fremove);
+    register_native_func("frename", native_frename);
+    register_native_func("SEEK_SET", native_SEEK_SET);
+    register_native_func("SEEK_CUR", native_SEEK_CUR);
+    register_native_func("SEEK_END", native_SEEK_END);
+    register_native_func("int_to_double", native_int_to_double);
+    register_native_func("double_to_int", native_double_to_int);
+    register_native_func("double_add", native_double_add);
+    register_native_func("double_sub", native_double_sub);
+    register_native_func("double_mul", native_double_mul);
+    register_native_func("double_div", native_double_div);
 }

src/parser.c

@@ -35,6 +35,12 @@ long factor() {
         pc++;
         return t->val;
     }
+    else if (t->type == Dbl) {
+        pc++;
+        union { double d; long l; } u;
+        u.d = t->dval;
+        return u.l;
+    }
     else if (t->type == Str) {
         pc++;
         return (long)t->text;
@@ -256,6 +262,26 @@ long relational() {
     return val;
 }
 
+long logical_and() {
+    long val = relational();
+    while (pc < MAX_TOK && tokens[pc].type == And) {
+        pc++;
+        long val2 = relational();
+        val = val && val2;
+    }
+    return val;
+}
+
+long logical_or() {
+    long val = logical_and();
+    while (pc < MAX_TOK && tokens[pc].type == Or) {
+        pc++;
+        long val2 = logical_and();
+        val = val || val2;
+    }
+    return val;
+}
+
 long expression() {
     if (pc >= MAX_TOK) return 0;
     if (tokens[pc].type == '*') {
@@ -327,5 +353,5 @@ long expression() {
         }
     }
 
-    return relational();
+    return logical_or();
 }

src/parser.h

@@ -2,6 +2,8 @@
 #define PARSER_H
 
 long expression();
+long logical_or();
+long logical_and();
 long relational();
 long add();
 long term();

src/tokenizer.c

@@ -34,11 +34,14 @@ void tokenize(char *src) {
 
             if (!strcmp(buf, "int")) t->type = Int;
             else if (!strcmp(buf, "char")) t->type = Char;
+            else if (!strcmp(buf, "double")) t->type = Double;
             else if (!strcmp(buf, "if")) t->type = If;
             else if (!strcmp(buf, "else")) t->type = Else;
             else if (!strcmp(buf, "while")) t->type = While;
             else if (!strcmp(buf, "return")) t->type = Return;
             else if (!strcmp(buf, "printf")) t->type = Printf;
+            else if (!strcmp(buf, "break")) t->type = Break;
+            else if (!strcmp(buf, "continue")) t->type = Continue;
             else t->type = Id;
 
             t->val = len;
@@ -46,9 +49,20 @@ void tokenize(char *src) {
             continue;
         }
 
-        if (isdigit(*s)) {
-            t->type = Num;
-            t->val = strtol(s, &s, 10);
+        if (isdigit(*s) || (*s == '.' && s[1] && isdigit(s[1]))) {
+            char *start = s;
+            int has_dot = 0;
+            while (*s && (isdigit(*s) || (*s == '.' && !has_dot))) {
+                if (*s == '.') has_dot = 1;
+                s++;
+            }
+            if (has_dot) {
+                t->type = Dbl;
+                t->dval = strtod(start, NULL);
+            } else {
+                t->type = Num;
+                t->val = strtol(start, NULL, 10);
+            }
             continue;
         }
 

src/types.h

@@ -8,13 +8,14 @@
 #define STR_POOL_SIZE 100000
 
 enum {
-    Num = 128, Str, Id, Int, Char, Else, If, While, Return, Printf,
-    Assign, Eq, Ne, Lt, Gt, Le, Ge, Or, And, Inc, Dec
+    Num = 128, Dbl, Str, Id, Int, Char, Double, Else, If, While, Return, Printf,
+    Assign, Eq, Ne, Lt, Gt, Le, Ge, Or, And, Inc, Dec, Break, Continue
 };
 
 typedef struct {
     int type;
     long val;
+    double dval;
     char *text;
 } Token;