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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | CONFORMING TO | SEE ALSO | COLOPHON |
FGETC(3) Linux Programmer's Manual FGETC(3)
fgetc, fgets, getc, getchar, ungetc - input of characters and strings
#include <stdio.h>
int fgetc(FILE *stream);
char *fgets(char *s, int size, FILE *stream);
int getc(FILE *stream);
int getchar(void);
int ungetc(int c, FILE *stream);
fgetc() reads the next character from stream and returns it as an
unsigned char cast to an int, or EOF on end of file or error.
getc() is equivalent to fgetc() except that it may be implemented as
a macro which evaluates stream more than once.
getchar() is equivalent to getc(stdin).
fgets() reads in at most one less than size characters from stream
and stores them into the buffer pointed to by s. Reading stops after
an EOF or a newline. If a newline is read, it is stored into the
buffer. A terminating null byte ('\0') is stored after the last
character in the buffer.
ungetc() pushes c back to stream, cast to unsigned char, where it is
available for subsequent read operations. Pushed-back characters
will be returned in reverse order; only one pushback is guaranteed.
Calls to the functions described here can be mixed with each other
and with calls to other input functions from the stdio library for
the same input stream.
For nonlocking counterparts, see unlocked_stdio(3).
fgetc(), getc() and getchar() return the character read as an
unsigned char cast to an int or EOF on end of file or error.
fgets() returns s on success, and NULL on error or when end of file
occurs while no characters have been read.
ungetc() returns c on success, or EOF on error.
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────────────────┼───────────────┼─────────┤
│fgetc(), fgets(), getc(), │ Thread safety │ MT-Safe │
│getchar(), ungetc() │ │ │
└──────────────────────────┴───────────────┴─────────┘
POSIX.1-2001, POSIX.1-2008, C89, C99.
It is not advisable to mix calls to input functions from the stdio
library with low-level calls to read(2) for the file descriptor
associated with the input stream; the results will be undefined and
very probably not what you want.
read(2), write(2), ferror(3), fgetwc(3), fgetws(3), fopen(3),
fread(3), fseek(3), getline(3), gets(3), getwchar(3), puts(3),
scanf(3), ungetwc(3), unlocked_stdio(3), feature_test_macros(7)
This page is part of release 4.12 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the
latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
GNU 2015-08-08 FGETC(3)
Pages that refer to this page: fgetwc(3), fgetws(3), flockfile(3), fpurge(3), fseek(3), getline(3), gets(3), getw(3), getwchar(3), puts(3), rpmatch(3), scanf(3), stdio(3), ungetwc(3)