sh: Split a command into arguments and pass those on

This is a big achievement!!

apps/src/sh.c

@@ -16,6 +16,33 @@ typedef struct
     size_t capacity;
 } command;
 
+char** split_command_into_argv(const char* cmd)
+{
+    size_t argc = 1;
+    char* ptr = strdup(cmd);
+    char* endptr;
+    char** arr = calloc(sizeof(char*), argc);
+    for (;;)
+    {
+        endptr = strchr(ptr, ' ');
+        arr[argc - 1] = ptr;
+        if (endptr == NULL) break;
+        *endptr = 0;
+        ptr = endptr + 1;
+        if (*ptr)
+        {
+            argc++;
+            arr = realloc(arr, sizeof(char*) * argc);
+        }
+        else
+            break;
+    }
+    argc++;
+    arr = realloc(arr, sizeof(char*) * argc);
+    arr[argc - 1] = NULL;
+    return arr;
+}
+
 char* shell_concat_path(const char* dirname, const char* basename)
 {
     char* buf = malloc(strlen(basename) + strlen(dirname) + 6);
@@ -137,9 +164,9 @@ void command_execute(command* cmd)
     }
     if (child == 0)
     {
-        char* argv[] = {cmd->buffer, NULL};
+        char** argv = split_command_into_argv(cmd->buffer);
         shell_execvp(argv[0], argv);
-        perror(cmd->buffer);
+        perror(argv[0]);
         exit(127);
     }
     pid_t result;

kernel/src/sys/exec.cpp

@@ -166,7 +166,10 @@ void sys_execv(Context* context, const char* pathname, char** argv)
     for (uint64_t i = 0; i <= kargc; i++)
     {
         stack_size += sizeof(char*);
-        if (kargv[i]) { stack_size += strlen(kargv[i]); }
+        if (kargv[i])
+        {
+            stack_size += strlen(kargv[i]) + 1; // count the null byte
+        }
     }
 
     if (stack_size >