int
fgetc(
FILE *stream
)
int
getc(
FILE *stream
)
int
getchar(
)
int
getc_unlocked(
FILE *stream
)
int
getchar_unlocked(
)
int
getw(
FILE *stream
)
)
function
obtains the next input character (if present) from the stream pointed at by
stream
,
or the next character pushed back on the stream via
ungetc(3).
The
getc()
function
acts essentially identically to
fgetc(
),
but is a macro that expands in-line.
The
getchar()
function
is equivalent to:
getc with the argument stdin.
The
getc_unlocked()
and
getchar_unlocked(
)
functions provide functionality identical to that of
getc(
)
and
getchar(
),
respectively, but do not perform implicit locking of the streams they
operate on.
In multi-threaded programs they may be used
only
within a scope in which the stream
has been successfully locked by the calling thread using either
flockfile(3)
or
ftrylockfile(3),
and may later be released using
funlockfile(3).
The
getw()
function
obtains the next
int
(if present)
from the stream pointed at by
stream
.
stream
.
If the stream is at end-of-file or a read error occurs,
the routines return
EOF
.
The routines
feof(3)
and
ferror(3)
must be used to distinguish between end-of-file and error.
If an error occurs, the global variable
errno
is set to indicate the error.
The end-of-file condition is remembered, even on a terminal, and all
subsequent attempts to read will return
EOF
until the condition is cleared with
clearerr(3).
),
getc(
)
and
getchar(
)
functions
conform to
ANSI X3.159-1989 (``ANSI C89'') .
The
getc_unlocked(
)
and
getchar_unlocked(
)
functions conform to
ISO/IEC 9945-1:1996 (``POSIX.1'') .
EOF
is a valid integer value,
feof(3)
and
ferror(3)
must be used to check for failure after calling
getw(
).
The size and byte order of an
int
varies from one machine to another, and
getw(
)
is not recommended for portable applications.