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getchar—read a character (macro) #include <stdio.h>
int getchar(void);
int _getchar_r(struct _reent *reent);
Description
getchar is a macro, defined in stdio.h. You can use getchar
to get the next single character from the standard input stream.
As a side effect, getchar advances the standard input's
current position indicator.
The alternate function _getchar_r is a reentrant version. The
extra argument reent is a pointer to a reentrancy structure.
Returns
unsigned char, and cast to
int), unless there is no more data, or the host system reports a
read error; in either of these situations, getchar returns EOF.
You can distinguish the two situations that cause an EOF result by
using `ferror(stdin)' and `feof(stdin)'.
Portability
getchar; it suggests, but does not require, that
getchar be implemented as a macro.
Supporting OS subroutines required: close, fstat, isatty,
lseek, read, sbrk, write.