NAME
UnGetC -- Makes a char available for reading again. (buffered) (V36)
SYNOPSIS
value = UnGetC(fh, character)
D0 D1 D2
LONG UnGetC(BPTR, LONG)FUNCTION
Pushes the character specified back into the input buffer. Every time you use a buffered read routine, you can always push back 1 character. You may be able to push back more, though it is not recommended, since there is no guarantee on how many can be pushed back at a given moment.
Passing -1 for the character will cause the last character read to be pushed back. If the last character read was an EOF, the next character read will be an EOF.
Note: UnGetC can be used to make sure that a filehandle is set up as a read filehandle. This is only of importance if you are writing a shell, and must manipulate the filehandle's buffer.
INPUTS
fh - filehandle to use for buffered I/O character - character to push back or -1
RESULT value - character pushed back, or FALSE if the character cannot be pushed back.
BUGS In V36, UnGetC(fh,-1) after an EOF would not cause the next character read to be an EOF. This was fixed for V37.
SEE ALSO