fix stack size issue, replaced by heap

when input is too long, stack isn't large enough

1 files changed, 17 insertions, 14 deletions

diff --git a/src/eval.cc b/src/eval.cc
index 716ca66..75c1d27 100644
--- a/src/eval.cc
+++ b/src/eval.cc
@@ -41,21 +41,24 @@ int eval_exe(const string &s, bool is_async, const T_lexer *lexer_instance, size
     loggerln("eval_exe: receive {}", s);
 
     bool task_type_is_subshell = false;
-    char raw_input[MAXLINE];
-    char **argv;
-    char cmd_with_path[MAXLINE];
+    const char *raw_input = nullptr;
+    char **argv = nullptr;
+    const char *unified_cmd_c = nullptr;
+    string unified_cmd, s_wrap_eliminated;
 
     // subshell type
     if (lexer_instance != nullptr)
     {
         task_type_is_subshell = true;
-        strcpy(raw_input, "SUBSHELL");
+        unified_cmd  = "SUBSHELL";
+        raw_input = unified_cmd.c_str();
     } 
     // command type
     else
     {
         task_type_is_subshell = false;
-        strcpy(raw_input, s.c_str());
+        s_wrap_eliminated = s.substr(0, s.find('\n')); // eliminate \n
+        raw_input = s_wrap_eliminated.c_str();
         
         argv = parseline(s);
 
@@ -63,8 +66,8 @@ int eval_exe(const string &s, bool is_async, const T_lexer *lexer_instance, size
 
         if (exe_bultin_command(argv)) return 0;
 
-        string cmd = find_cmd(argv[0]);
-        strcpy(cmd_with_path, cmd.c_str());
+        unified_cmd = find_cmd(argv[0]);
+        unified_cmd_c = unified_cmd.c_str();
     }
 
     // block_io signals can stop shell
@@ -97,43 +100,43 @@ int eval_exe(const string &s, bool is_async, const T_lexer *lexer_instance, size
         }
 
         // normal command
-        execve(cmd_with_path, argv, environ);
+        execve(unified_cmd_c, argv, environ);
 
         // execve: if success, never returns
 
-        wrap_eliminator(raw_input);
         cout << raw_input << flush;
         switch (errno)
         {
             case ENOTDIR:
                 println(": A component of the path prefix is not a directory.");
-                exit(errno);
+                _exit(errno);
                 break;
             
             case ENAMETOOLONG:
                 println(": A component of a pathname exceeded 255 characters, or an entire path name exceeded 1023 characters.");
-                exit(errno);
+                _exit(errno);
                 break;
             
             case ENOENT:
                 println(": The new process file does not exist.");
-                exit(errno);
+                _exit(errno);
                 break;
 
             case EACCES:
                 println(": The new process file mode denies execute permission.");
-                exit(errno);
+                _exit(errno);
                 break;
 
             default:
                 println(": Error, code: {}", errno);
-                exit(errno);
+                _exit(errno);
         }
     }
 
     // parent
 
     operator delete(argv);
+    argv = nullptr;
 
     exit_required_pid = pid;