The ckint utility prompts a user, then validates the response. It defines, among other things, a prompt message whose response should be an integer, text for help and error messages, and a default value (which will be returned if the user responds with a carriage return).
All messages are limited in length to 70 characters and are formatted automatically. Any white space used in the definition (including newline) is stripped. The -W option cancels the automatic formatting. When a tilde is placed at the beginning or end of a message definition, the default text will be inserted at that point, allowing both custom text and the default text to be displayed.
If the prompt, help or error message is not defined, the default message (as defined under NOTES) will be displayed.
Three visual tool modules are linked to the ckint command. They are errint (which formats and displays an error message), helpint (which formats and displays a help message), and valint (which validates a response). These modules should be used in conjunction with FML objects. In this instance, the FML object defines the prompt. When base is defined in the errint and helpint modules, the messages will include the expected base of the input.
The following options are supported:
Defines the base for input. Must be 2 to 36, default is 10.
Defines the default value as default. The default is not validated and so does not have to meet any criteria.
Defines the error message as error.
Defines the help messages as help.
Specifies that process ID pid is to be sent a signal if the user chooses to abort.
Defines the prompt message as prompt.
Specifies that quit will not be allowed as a valid response.
Specifies that the process ID pid defined with
the -k option is to be sent signal signal when quit is chosen. If no signal is specified,
SIGTERM is used.
Specifies that prompt, help and error messages will be formatted to a line length of width.
The following exit values are returned:
EOF on input, or negative width on -W option, or usage error.
User termination (quit).
See attributes(5) for descriptions of the following attributes:
|ATTRIBUTE TYPE||ATTRIBUTE VALUE|
The default base 10 prompt for ckint is:
Enter an integer [?,q]:
The default base 10 error message is:
ERROR - Please enter an integer.
The default base 10 help message is:
Please enter an integer.
The messages are changed from "integer" to "base base integer" if the base is set to a number other than 10.
When the quit option is chosen (and allowed), q is returned along with the return code 3. The valint module will not produce any output. It returns 0 for success and non-zero for failure.