feat(execution): set $? var

src/execution/execution.c

@@ -216,6 +216,7 @@ int execution(struct ast *ast, struct hash_map *vars)
 
     switch (ast->type)
     {
+    case AST_VOID:
     case AST_END: {
         return 0;
     }

src/main.c

@@ -84,10 +84,14 @@ int main(int argc, char **argv)
     // Main parse-execute loop
     while (command_ast != NULL && command_ast->type != AST_END)
     {
-        // Execute AST
-        return_code = execution(command_ast, vars);
+        if (command_ast->type != AST_VOID)
+        {
+            // Execute AST
+            return_code = execution(command_ast, vars);
 
-        // set $? variable
+            // set $? variable
+            set_var_int(vars, "?", return_code);
+        }
 
         ast_free(&command_ast);
 

src/utils/string_utils/string_utils.c

@@ -1,6 +1,7 @@
 #include "string_utils.h"
 
 #include <ctype.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
@@ -42,3 +43,11 @@ char *insert_into(char *dest, const char *src, size_t pos, size_t len)
         return realloc(dest, new_len + 1);
     return dest;
 }
+
+void int_to_str(int value, char *buffer)
+{
+    if (buffer == NULL)
+        return;
+
+    snprintf(buffer, 11, "%d", value);
+}

src/utils/string_utils/string_utils.h

@@ -18,4 +18,13 @@ char *trim_blank_left(char *str);
  */
 char *insert_into(char *dest, const char *src, size_t pos, size_t len);
 
+/**
+ * Converts an integer to its string representation.
+ * @param value The integer value to convert.
+ * @param buffer A character array where the resulting string will be stored.
+ * The buffer must be at least 11 bytes long to accommodate the largest
+ * 32-bit integer and the null terminator.
+ */
+void int_to_str(int value, char *buffer);
+
 #endif /* STRING_UTILS_H */

src/utils/vars/vars.c

@@ -9,6 +9,7 @@
 #include <unistd.h>
 
 #include "../hash_map/hash_map.h"
+#include "../string_utils/string_utils.h"
 
 #define VARS_INITIAL_SIZE 16
 
@@ -16,8 +17,8 @@ static void vars_default(struct hash_map *vars)
 {
     set_var_copy(vars, "?", "0");
     pid_t pid = getpid();
-    char pid_str[20];
-    snprintf(pid_str, sizeof(pid_str), "%d", pid);
+    char pid_str[11];
+    int_to_str(pid, pid_str);
     set_var_copy(vars, "$", pid_str);
 }
 
@@ -71,3 +72,10 @@ bool set_var_copy(struct hash_map *vars, const char *key, const char *value)
         free(value_copy);
     return res;
 }
+
+bool set_var_int(struct hash_map *vars, const char *key, int value)
+{
+    char value_str[11];
+    int_to_str(value, value_str);
+    return set_var_copy(vars, key, value_str);
+}

src/utils/vars/vars.h

@@ -40,4 +40,10 @@ bool set_var(struct hash_map *vars, const char *key, const char *value,
  */
 bool set_var_copy(struct hash_map *vars, const char *key, const char *value);
 
+/**
+ * Set the value of a variable to an integer. Behavior is similar to
+ * set_var_copy.
+ */
+bool set_var_int(struct hash_map *vars, const char *key, int value);
+
 #endif /* ! VARS_H */