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efi_selftest: ask before overwriting in dtbdump.efi

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Before overwriting an existing file ask the user.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2021-01-17 05:13:21 +01:00
parent 19ea5e66de
commit b6f6080f56
1 changed files with 59 additions and 1 deletions
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60
lib/efi_selftest/dtbdump.c
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@ -41,7 +41,51 @@ static void error(u16 *string)
}
/**
* input() - read string from console
* efi_input_yn() - get answer to yes/no question
*
* Return:
* y or Y
* EFI_SUCCESS
* n or N
* EFI_ACCESS_DENIED
* ESC
* EFI_ABORTED
*/
static efi_status_t efi_input_yn(void)
{
struct efi_input_key key = {0};
efi_uintn_t index;
efi_status_t ret;
/* Drain the console input */
ret = cin->reset(cin, true);
for (;;) {
ret = bs->wait_for_event(1, &cin->wait_for_key, &index);
if (ret != EFI_SUCCESS)
continue;
ret = cin->read_key_stroke(cin, &key);
if (ret != EFI_SUCCESS)
continue;
switch (key.scan_code) {
case 0x17: /* Escape */
return EFI_ABORTED;
default:
break;
}
/* Convert to lower case */
switch (key.unicode_char | 0x20) {
case 'y':
return EFI_SUCCESS;
case 'n':
return EFI_ACCESS_DENIED;
default:
break;
}
}
}
/**
* efi_input() - read string from console
*
* @buffer: input buffer
* @buffer_size: buffer size
@ -379,6 +423,20 @@ efi_status_t do_save(u16 *filename)
error(L"Failed to open volume\n");
return ret;
}
/* Check if file already exists */
ret = root->open(root, &file, filename, EFI_FILE_MODE_READ, 0);
if (ret == EFI_SUCCESS) {
file->close(file);
cout->output_string(cout, L"Overwrite existing file (y/n)? ");
ret = efi_input_yn();
cout->output_string(cout, L"\n");
if (ret != EFI_SUCCESS) {
root->close(root);
error(L"Aborted by user\n");
return ret;
}
}
/* Create file */
ret = root->open(root, &file, filename,
EFI_FILE_MODE_READ | EFI_FILE_MODE_WRITE |