Makefile

@@ -1,4 +1,4 @@
-SOURCES := src/main.c src/exec.c src/util/calloc.c src/util/string.c src/util/hash.c src/lexer/lexer.c src/builtins/builtins.c src/util/memset.c
+SOURCES := src/main.c src/util/calloc.c src/util/string.c src/util/hash.c src/lexer/lexer.c src/builtins/builtins.c src/util/memset.c
 CFLAGS := -g -Oz -nostdlib
 LDFLAGS :=
 

src/exec.c

@@ -1,122 +0,0 @@
-#include "builtins/builtins.h"
-#include "lexer/lexer.h"
-#include "system/system.h"
-
-static int do_exec(msh_lexer *lexer, char *cmd, char **args, int *n,
-                   int *exec_status) {
-  char full_path[4096];
-  char is_first_arg = 0, exec_success = 0;
-  unsigned short i = 0, j = 0, counter = 0;
-
-  args[*n] = 0;
-
-  /* Do nothing on blank commands */
-  if (*cmd == '\0') {
-    exec_success = 1;
-  }
-  /* Check if the command is a built-in */
-  else if (msh_try_builtin(cmd, args)) {
-    exec_success = 1;
-  }
-  /* If the command is a folder, cd to it */
-  else if (msh_path_is_directory(cmd)) {
-    msh_builtin_cd(cmd);
-    exec_success = 1;
-  }
-  /* If the command is a file, first try and execute it. */
-  else if (msh_path_exists(cmd)) {
-    msh_system_execute(cmd, args);
-    exec_success = 1;
-  } else {
-    /* loop through all the path entries and check if the file exists in them.
-     */
-    i = 0, *n = 0, j = 0;
-    while (j <= lexer->path_count) {
-      full_path[*n] = lexer->path[j];
-      *n += 1;
-      if (lexer->path[j] == '\0') {
-        full_path[*n - 1] = msh_path_seperator;
-        for (i = 0; cmd[i] != 0; i++) {
-          full_path[i + *n] = cmd[i];
-        }
-        *n += i;
-        full_path[*n] = '\0';
-        *n += 1;
-
-        if (msh_path_exists(full_path)) {
-          msh_system_execute(full_path, args);
-          exec_success = 1;
-          break;
-        }
-
-        counter++;
-        if (counter > 2) {
-          break;
-        }
-        *n = 0;
-      } else {
-        counter = 0;
-      }
-      j++;
-    }
-  }
-  if (!exec_success) {
-    msh_print_strings("msh: ", cmd, ": command not found\n\r", 0);
-  }
-  /* flush out args */
-  for (i = 0; i < 512; i++) {
-    if (args[i] == 0) {
-      break;
-    }
-    args[i] = 0;
-  }
-
-  return 0;
-}
-
-int msh_execute(msh_lexer *lexer) {
-  msh_lexer_item_list *list = lexer->item_list_head;
-  char *cmd = list->item->str;
-  SIZE_TYPE cmd_size;
-  int i = 0, n = 0, exec_status = 0;
-  SIZE_TYPE args_size = 0;
-  char *args[512];
-
-  while (list != 0) {
-    if (!list->item) {
-      break;
-    }
-    switch (list->item->type) {
-    case MSH_LEXER_ITEM_TYPE_UNKNOWN:
-      break;
-    case MSH_LEXER_ITEM_TYPE_WORD:
-      if (cmd == 0 && *list->item->str != '\0') {
-        cmd = list->item->str;
-      } else {
-        args[n++] = list->item->str;
-      }
-      break;
-    case MSH_LEXER_ITEM_TYPE_COMMENT:
-      break;
-    case MSH_LEXER_ITEM_TYPE_OP_OR:
-      break;
-    case MSH_LEXER_ITEM_TYPE_OP_AND:
-      do_exec(lexer, cmd, args, &n, &exec_status);
-      n = 0;
-      cmd = 0;
-      break;
-    case MSH_LEXER_ITEM_TYPE_OP_PIPE:
-      break;
-    case MSH_LEXER_ITEM_TYPE_OP_CONTROL:
-      break;
-    case MSH_LEXER_ITEM_TYPE_OP_SEMICOLON:
-      break;
-    }
-    list = list->next;
-  }
-  do_exec(lexer, cmd, args, &n, &exec_status);
-
-  msh_lexer_flush(lexer);
-
-  return 0;
-};

src/lexer/lexer.c

@@ -29,7 +29,9 @@
 */
 #include "lexer.h"
 
+#include "../builtins/builtins.h"
 #include "../system/system.h"
+#include <linux/limits.h>
 
 msh_lexer msh_lexer_new() {
   msh_lexer l = {0};
@@ -146,6 +148,125 @@ lexer_cancel:
   return;
 }
 
+static int do_exec(msh_lexer *lexer, char *cmd, char **args, int *n,
+                   int *exec_status) {
+  char full_path[PATH_MAX];
+  char is_first_arg = 0, exec_success = 0;
+  unsigned short i = 0, j = 0, counter = 0;
+
+  args[*n] = 0;
+
+  /* Do nothing on blank commands */
+  if (*cmd == '\0') {
+    exec_success = 1;
+  }
+  /* Check if the command is a built-in */
+  else if (msh_try_builtin(cmd, args)) {
+    exec_success = 1;
+  }
+  /* If the command is a folder, cd to it */
+  else if (msh_path_is_directory(cmd)) {
+    msh_builtin_cd(cmd);
+    exec_success = 1;
+  }
+  /* If the command is a file, first try and execute it. */
+  else if (msh_path_exists(cmd)) {
+    msh_execute(cmd, args);
+    exec_success = 1;
+  } else {
+    /* loop through all the path entries and check if the file exists in them.
+     */
+    i = 0, *n = 0, j = 0;
+    while (j <= lexer->path_count) {
+      full_path[*n] = lexer->path[j];
+      *n += 1;
+      if (lexer->path[j] == '\0') {
+        full_path[*n - 1] = msh_path_seperator;
+        for (i = 0; cmd[i] != 0; i++) {
+          full_path[i + *n] = cmd[i];
+        }
+        *n += i;
+        full_path[*n] = '\0';
+        *n += 1;
+
+        if (msh_path_exists(full_path)) {
+          msh_execute(full_path, args);
+          exec_success = 1;
+          break;
+        }
+
+        counter++;
+        if (counter > 2) {
+          break;
+        }
+        *n = 0;
+      } else {
+        counter = 0;
+      }
+      j++;
+    }
+  }
+  if (!exec_success) {
+    msh_print_strings("msh: ", cmd, ": command not found\n\r", 0);
+  }
+  /* flush out args */
+  for (i = 0; i < 512; i++) {
+    if (args[i] == 0) {
+      break;
+    }
+    args[i] = 0;
+  }
+
+  return 0;
+}
+
+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;
+  int i = 0, n = 0, exec_status = 0;
+  SIZE_TYPE args_size = 0;
+  char *args[512];
+
+  while (list != 0) {
+    if (!list->item) {
+      break;
+    }
+    switch (list->item->type) {
+    case MSH_LEXER_ITEM_TYPE_UNKNOWN:
+      break;
+    case MSH_LEXER_ITEM_TYPE_WORD:
+      if (cmd == 0 && *list->item->str != '\0') {
+        cmd = list->item->str;
+      } else {
+        args[n++] = list->item->str;
+      }
+      break;
+    case MSH_LEXER_ITEM_TYPE_COMMENT:
+      break;
+    case MSH_LEXER_ITEM_TYPE_OP_OR:
+      break;
+    case MSH_LEXER_ITEM_TYPE_OP_AND:
+      do_exec(lexer, cmd, args, &n, &exec_status);
+      n = 0;
+      cmd = 0;
+      break;
+    case MSH_LEXER_ITEM_TYPE_OP_PIPE:
+      break;
+    case MSH_LEXER_ITEM_TYPE_OP_CONTROL:
+      break;
+    case MSH_LEXER_ITEM_TYPE_OP_SEMICOLON:
+      break;
+    }
+    list = list->next;
+  }
+  do_exec(lexer, cmd, args, &n, &exec_status);
+
+  msh_lexer_flush(lexer);
+
+  return 0;
+};
+
 void msh_lexer_flush(msh_lexer *lexer) {
   msh_lexer_item_list *list = lexer->item_list_head;
   while (list->item != 0) {

src/lexer/lexer.h

@@ -68,7 +68,7 @@ void msh_lexer_push_item(msh_lexer *lexer, msh_lexer_item_type type, char *buf,
 
 void msh_lexer_flush(msh_lexer *lexer);
 
-int msh_execute(msh_lexer *lexer);
+int msh_lexer_execute(msh_lexer *lexer);
 
 void msh_lexer_free(msh_lexer *lexer);
 

src/main.c

@@ -86,7 +86,7 @@ static void loop_func(int action) {
     if (*ctx.buf != '\0') {
       int ret;
       msh_lexer_parse(&ctx.lexer, ctx.buf, ctx.sz + 1);
-      ret = msh_execute(&ctx.lexer);
+      ret = msh_lexer_execute(&ctx.lexer);
 
       itoa(ret, ctx.result_str, 10);
     }

src/system/linux/linux.c

@@ -173,7 +173,7 @@ void msh_move_cursor(signed int offset) {
 
 void msh_write(char *st, SIZE_TYPE size) { SYSCALL(write, 1, st, size); }
 
-int msh_system_execute(char *cmd, char **args) {
+int msh_execute(char *cmd, char **args) {
   SIZE_TYPE fork;
 
   if (*cmd == '\0') {

src/system/system.h

@@ -145,7 +145,7 @@ typedef struct msh_process_t {
  * Non-zero return values are the exit status. -1 implies the command was not
  * found.
  */
-int msh_system_execute(char *cmd, char **args);
+int msh_execute(char *cmd, char **args);
 
 /*
     Get an environment variable with the given key.