RTEMS | Ignore empty user names as input (!202)

[shuhua hua (@huangshuhua)]

shuhua hua commented on a discussion: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/202#note_111788


Just as when we use other systems such as the Linux system, user account information is typically stored in the /etc/passwd file, with each account having a line of records that include the username, password (stored in an encrypted form), user ID, group ID, and other information. Records with a blank username are not permitted because this would cause the system to be unable to correctly identify and manage the user. 
If a user does not wish to use a username, they can set the login_check parameter to NULL in rtems_shell_init when logging into the shell. 
Currently, during system startup, when prompting the user to enter a username, some additional printouts may be appended after the username prompt. Users usually press the Enter key, which then leads to a password prompt, and pressing Enter again will lead to a prompt to re-enter the username. By incorporating a check to see if the user's input for the username is empty, the system can directly prompt the user to enter a username, thus avoiding the aforementioned operations.

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/202#note_111788
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