don't return from command not found

src/lexer/lexer.c

@@ -122,13 +122,13 @@ lexer_cancel:
   return;
 }
 
-void msh_lexer_execute(msh_lexer *lexer) {
+int msh_lexer_execute(msh_lexer *lexer) {
   msh_lexer_item_list *list = lexer->item_list_head;
   char *cmd = list->item->str;
   SIZE_TYPE cmd_size = list->item->strlen;
 
   SIZE_TYPE args_size = 0;
-  char is_first_arg = 0, exec_success = 0;
+  char is_first_arg = 0, exec_success = 0, exec_status = 0;
   unsigned short i = 0, n = 0, j = 0, counter = 0;
   char full_path[PATH_MAX];
   char *args[512];
@@ -174,7 +174,7 @@ void msh_lexer_execute(msh_lexer *lexer) {
         full_path[n++] = '\0';
 
         if (msh_path_exists(full_path)) {
-          msh_execute(full_path, args);
+          exec_status = msh_execute(full_path, args);
           exec_success = 1;
           break;
         }
@@ -195,6 +195,8 @@ void msh_lexer_execute(msh_lexer *lexer) {
   }
 
   msh_lexer_flush(lexer);
+
+  return exec_status == 0 ? exec_status : exec_success;
 };
 
 void msh_lexer_flush(msh_lexer *lexer) {
@@ -213,5 +215,4 @@ void msh_lexer_flush(msh_lexer *lexer) {
 void msh_lexer_free(msh_lexer *lexer) {
   msh_deallocate(lexer->path);
   msh_deallocate(lexer->item_list_head);
-  msh_deallocate(lexer);
 };

src/lexer/lexer.h

@@ -38,7 +38,7 @@ void msh_lexer_push_item(msh_lexer *lexer, msh_lexer_item_type type, char *buf,
 
 void msh_lexer_flush(msh_lexer *lexer);
 
-void msh_lexer_execute(msh_lexer *lexer);
+int msh_lexer_execute(msh_lexer *lexer);
 
 void msh_lexer_free(msh_lexer *lexer);
 

src/main.c

@@ -1,82 +1,94 @@
 #include "lexer/lexer.h"
 #include "system/system.h"
 
-/* Makefile-defined system entry point. */
-MSH_ENTRY_POINT {
+static struct {
   msh_lexer lexer;
-
-  msh_backend_init();
-
-  lexer = msh_lexer_new();
-
-  while (1) {
-    int out;
   char buf[513];
-    int i = 0, n = 0, last = 0;
-    SIZE_TYPE sz = 0, leftoff = 0;
+  char result_str[16];
+  SIZE_TYPE sz;
+  SIZE_TYPE leftoff;
+} ctx = {0};
 
-    memset(buf, 0, sizeof(buf));
+static void print_heading() {
+  msh_print_strings("[", ctx.result_str, "] ", msh_working_directory(), " %> ",
+                    0);
+}
 
-    msh_print_strings(msh_working_directory(), " %> ", 0);
+static void loop_func(int action) {
 
-    while ((out = msh_read_input(buf, &sz, 512)), out != -1) {
-      switch (out) {
+  switch (action) {
   /* backspace (also do this when we run out of space) */
   case -2:
   case 0x7F:
-        if (sz > 0) {
+    if (ctx.sz > 0) {
       msh_move_cursor(-1);
       msh_write(" ", 1);
       msh_move_cursor(-1);
-          buf[sz--] = '\0';
+      ctx.buf[ctx.sz--] = '\0';
     }
     break;
     /* Ctrl-C */
   case 0x3:
     msh_print_string("^C\n\r");
-        goto end_loop;
-        break;
+    return;
   /* left */
   case -3:
-        if (sz > 0) {
+    if (ctx.sz > 0) {
       msh_move_cursor(-1);
-          --sz;
-          ++leftoff;
+      --ctx.sz;
+      ++ctx.leftoff;
     }
     break;
   /* right */
   case -4:
-        if (leftoff > 0) {
+    if (ctx.leftoff > 0) {
       msh_move_cursor(1);
-          --leftoff;
+      --ctx.leftoff;
     }
-        if (sz < 2048) {
-          ++sz;
+    if (ctx.sz < 2048) {
+      ++ctx.sz;
     }
     break;
+    /* execute */
+  case -1:
+    ctx.sz += ctx.leftoff;
+    ctx.buf[ctx.sz] = '\0';
+
+    if (*ctx.buf != '\0') {
+      int ret;
+      msh_lexer_parse(&ctx.lexer, ctx.buf, ctx.sz + 1);
+      ret = msh_lexer_execute(&ctx.lexer);
+
+      itoa(ret, ctx.result_str, 10);
+    }
+
+    memset(ctx.buf, 0, sizeof(ctx.buf));
+    ctx.sz = 0;
+    ctx.leftoff = 0;
+
+    print_heading();
+    break;
   default:
-        if (leftoff > 0) {
-          --leftoff;
+    if (ctx.leftoff > 0) {
+      --ctx.leftoff;
     }
     break;
   }
 }
 
-    sz += leftoff;
-    buf[sz] = '\0';
+/* Makefile-defined system entry point. */
+MSH_ENTRY_POINT {
+  msh_backend_init();
 
-    if (*buf != '\0') {
-      msh_lexer_parse(&lexer, buf, sz + 1);
-      msh_lexer_execute(&lexer);
-    }
+  ctx.lexer = msh_lexer_new();
 
-    // msh_execute(buf, args);
+  ctx.result_str[0] = '0';
 
-  end_loop:
-    continue;
-  }
+  print_heading();
 
-  msh_lexer_free(&lexer);
+  msh_loop(ctx.buf, &ctx.sz, 512, loop_func);
+
+  msh_lexer_free(&ctx.lexer);
 
   msh_backend_deinit();
 }

src/system/linux/linux.c

@@ -4,6 +4,7 @@
 
 #include <linux/kd.h>
 #include <linux/limits.h>
+#include <signal.h>
 #include <sys/file.h>
 #include <sys/ioctl.h>
 #include <sys/resource.h>
@@ -13,9 +14,79 @@
 #include <sys/termios.h>
 #include <sys/wait.h>
 
+static const char *signal_table[] = {
+    "Hangup",
+    "Interrupt",
+    "Quit",
+    "Illegal instruction",
+    "Trace/breakpoint trap",
+    "Aborted",
+    "(Same value as SIGABRT) Aborted",
+    "Bus error",
+    "Floating point exception",
+    "Killed",
+    "User defined signal 1",
+    "Segmentation fault",
+    "User defined signal 2",
+    "Broken pipe",
+    "Alarm clock",
+    "Terminated",
+    "Stack fault",
+    "Child exited",
+    "(Same value as SIGCHLD) Child exited",
+    "Continued",
+    "Stopped (signal)",
+    "Stopped",
+    "Stopped (tty input)",
+    "Stopped (tty output)",
+    "Urgent I/O condition",
+    "CPU time limit exceeded",
+    "File size limit exceeded",
+    "Virtual timer expired",
+    "Profiling timer expired",
+    "Window changed",
+    "I/O possible",
+    "(Same value as SIGPOLL) I/O possible",
+    "Power failure",
+    "Bad system call",
+    "Real-time signal reserved by the C library for NPTL ; see signal(7)",
+    "Real-time signal reserved by the C library for NPTL ; see signal(7)",
+    "Real-time signal 0",
+    "Real-time signal 1",
+    "Real-time signal 2",
+    "Real-time signal 3",
+    "Real-time signal 4",
+    "Real-time signal 5",
+    "Real-time signal 6",
+    "Real-time signal 7",
+    "Real-time signal 8",
+    "Real-time signal 9",
+    "Real-time signal 10",
+    "Real-time signal 11",
+    "Real-time signal 12",
+    "Real-time signal 13",
+    "Real-time signal 14",
+    "Real-time signal 15",
+    "Real-time signal 16",
+    "Real-time signal 17",
+    "Real-time signal 18",
+    "Real-time signal 19",
+    "Real-time signal 20",
+    "Real-time signal 21",
+    "Real-time signal 22",
+    "Real-time signal 23",
+    "Real-time signal 24",
+    "Real-time signal 25",
+    "Real-time signal 26",
+    "Real-time signal 27",
+    "Real-time signal 28",
+    "Real-time signal 29",
+    "Real-time signal 30"};
+
 char msh_path_seperator = '/';
 
-int msh_read_input(char *ptr, SIZE_TYPE *size, SIZE_TYPE n) {
+void msh_loop(char *ptr, SIZE_TYPE *size, SIZE_TYPE n, void (*f)(int action)) {
+  for (;;) {
     char ch = 0;
     SIZE_TYPE sz = 0;
     while (ch == 0) {
@@ -34,16 +105,19 @@ int msh_read_input(char *ptr, SIZE_TYPE *size, SIZE_TYPE n) {
             SYSCALL(read, 0, &ch, 1);
             switch (ch) {
             case 'C':
-            return -4;
+              f(-4);
+              break;
             case 'D':
-            return -3;
+              f(-3);
+              break;
             }
           }
           break;
           /* return */
         case '\r':
           SYSCALL(write, 1, "\n\r", 2);
-        return -1;
+          f(-1);
+          break;
         default:
           break;
         }
@@ -51,10 +125,11 @@ int msh_read_input(char *ptr, SIZE_TYPE *size, SIZE_TYPE n) {
     }
 
     if (*size >= n) {
-    return -2;
+      f(-2);
     }
 
-  return ch;
+    f(ch);
+  }
 };
 
 void msh_move_cursor(signed int offset) {
@@ -112,22 +187,35 @@ int msh_execute(char *cmd, char **args) {
 
     return ret;
   } else {
-    siginfo_t status;
+    int status;
     struct rusage ru;
     SIZE_TYPE ret;
     char *status_str;
 
     msh_linux_setup_signals();
 
-    ret = (SIZE_TYPE)SYSCALL(waitid, P_ALL, fork, &status, WEXITED, &ru);
+    SYSCALL(wait4, fork, &status, 0, &ru);
 
     SYSCALL(kill, fork, SIGKILL);
 
     SYSCALL(write, 1, "\r", 2);
 
-    msh_linux_start_input_capture();
+    char pid_str[16];
+    itoa(fork, pid_str, 10);
 
-    return status.si_signo;
+    if (WIFSIGNALED(status)) {
+      msh_print_strings(pid_str, "    ", (char *)signal_table[WTERMSIG(status)],
+                        "    ", cmd, "\n\r", 0);
+      ret = WTERMSIG(status);
+    } else if (WIFSTOPPED(status)) {
+      msh_print_strings(pid_str, "\tstopped\t", cmd, "\n\r", 0);
+      ret = WEXITSTATUS(status);
+    } else {
+      ret = WEXITSTATUS(status);
+    }
+
+    msh_linux_start_input_capture();
+    return ret;
   }
   return 0;
 };
@@ -153,11 +241,7 @@ msh_file msh_file_open(const char *file) {
   return f;
 };
 
-void msh_file_close(msh_file *file) {
-  SYSCALL(close, file->__fd);
-
-  msh_deallocate(file);
-};
+void msh_file_close(msh_file *file) { SYSCALL(close, file->__fd); };
 
 void msh_file_read(msh_file *file, char *ptr, SIZE_TYPE n) {
   SYSCALL(read, file->__fd, ptr, n);

src/system/system.h

@@ -62,9 +62,12 @@ int msh_path_is_directory(char *path);
 void msh_file_read(msh_file *file, char *ptr, SIZE_TYPE n);
 
 /*
- * Read user input into ptr, stopping if it has reached n characters.
- * RETURNS:
- * * -1 = if finished reading
+ * Starts a loop that executes the given function whenever an action that
+ * necessitates it (i.e. terminal input) happens. On that note, it also reads
+ * input (up to n characters) into pointer you give it.
+ *
+ * ACTIONS:
+ * * * -1 = if finished reading
  * * -2 = if it ran out of space.
  * * -3 = left arrow
  * * -4 = right arrow
@@ -72,7 +75,7 @@ void msh_file_read(msh_file *file, char *ptr, SIZE_TYPE n);
  * * -6 = ctrl right arrow
  * *  0 < ascii character
  */
-int msh_read_input(char *ptr, SIZE_TYPE *size, SIZE_TYPE n);
+void msh_loop(char *ptr, SIZE_TYPE *size, SIZE_TYPE n, void (*f)(int action));
 
 /*
  * Move terminal cursor x characters to the right. Pass in negative to go left.

src/util/string.c

@@ -2,13 +2,7 @@
 
 #include <stdarg.h>
 
-void msh_print_string(char *str) {
-  int i = 0;
-  while (str[i] != '\0') {
-    msh_write(&str[i], 1);
-    i++;
-  }
-}
+void msh_print_string(char *str) { msh_write(str, strlen(str)); }
 
 void msh_print_strings(char *str, ...) {
   va_list va;