增加一个测试程序

apps/filereader/CMakeLists.txt

@@ -0,0 +1,2 @@
+add_binary(filereader)
+target_link_libraries(filereader misc)

apps/filereader/main.c

@@ -0,0 +1,17 @@
+
+#include <libc.h>
+#include <sys.h>
+int main(int argc, const char **argv) {
+  if (argc != 2) {
+    printf("Usage: %s filename\n", argv[0]);
+    return 1;
+  }
+  size_t size = __syscall(SYSCALL_FILE_SIZE, argv[1]);
+  byte  *buff = (byte *)xmalloc(size);
+  __syscall(SYSCALL_LOAD_FILE, argv[1], buff, size);
+  for (int i = 0; i < size; i++) {
+    printf("%c", buff[i]);
+  }
+  printf("\n");
+  return 0;
+}

src/boot/make.sh

@@ -13,6 +13,7 @@ mcopy -i disk.img v86_service.bin ::
 qemu-img create hd.img 128M
 mformat -t 64 -h 64 -i hd.img
 mcopy -i hd.img testapp.bin ::
+mcopy -i hd.img filereader.bin ::
 mcopy -i hd.img testapp-cpp.bin ::
 mcopy -i hd.img font1.plff ::
 mcopy -i hd.img font2.plff ::

src/kernel/task/shell.c

@@ -182,26 +182,6 @@ int shell_exec(char *path, cstr comand) {
       pos += len;
     }
     free(buf);
-  } else if (strneq(comand, "readhex ", 8)) {
-    char      *s = comand + 8;
-    vfs_node_t p = vfs_open(s);
-    if (!p) {
-      printf("open %s failed\n", s);
-      return 1;
-    }
-    if (p->type == file_dir) {
-      printf("not a file\n");
-      return 1;
-    }
-    size_t size = p->size;
-    byte  *buf  = malloc(size);
-    memset(buf, 0, size);
-    vfs_read(p, buf, 0, size);
-    for (size_t i = 0; i < size; i++) {
-      printf("%02x ", buf[i]);
-    }
-    printf("\n");
-    free(buf);
   } else if (strneq(comand, "mkdir ", 6)) {
     vfs_mkdir(comand + 6);
   } else if (strneq(comand, "mount ", 6)) {