GETC(3) | Library Functions Manual | GETC(3) |
fgetc
, getc
,
getchar
, getc_unlocked
,
getchar_unlocked
, getw
—
#include <stdio.h>
int
fgetc
(FILE
*stream);
int
getc
(FILE
*stream);
int
getchar
();
int
getc_unlocked
(FILE
*stream);
int
getchar_unlocked
();
int
getw
(FILE
*stream);
fgetc
() 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.
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).
fgetc
(), 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”).
getc
() and getw
() functions
appeared in Version 1 AT&T UNIX.
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.
September 2, 2019 | NetBSD 9.2 |