These routines poll the Standard Input queue. If keys are expected from the keyboard but none are available (return value = 0), control must be returned to the nShell application to allow processing. Subsequent calls to Stdin routines will contain the new keystrokes.
These routines are compatible with nShell I/O redirection.
NSH_getchar
-----------
int NSH_getchar(void);
PARAMETERS
none
RETURNS
0 no characters available
-1 end of input
others next character in input queue
PROCESS
This routine polls the Standard Input queue. If any characters are available, they are returned to the external command.
On the console, a control-D is used to signal end of input.
NSH_gets
--------
int NSH_gets(char *s, int max_len);
PARAMETERS
char *s address of a character buffer to fill
int max_len maximum number of characters
RETURNS
0 no characters available
-1 end of input
others length of input string
PROCESS
This routine polls the Standard Input queue. If any characters are available, they are returned to the external command. Characters are transferred to the "s" buffer until it is filled, or until a Return character or End Of Input is encountered. Return characters are placed in the "s" buffer. If the "s" buffer is smaller than a line of input, the incoming string will be split among subsequent calls.
On the console, a control-D is used to signal end of input.
NSH_getStr
----------
int NSH_getStr(Str255 s);
PARAMETERS
Str255 s address of a Pascal string to fill
RETURNS
0 no characters available
-1 end of input
others length of input string
PROCESS
This routine polls the Standard Input queue. If any characters are available, they are returned to the external command. Characters are transferred to the "s" string until it is filled, or until a Return character or End Of Input is encountered. Return characters are placed in the "s" string. If a line of input is longer than 255 characters, the incoming string will be split among subsequent calls.
On the console, a control-D is used to signal end of input.