getc(3) — Linux manual page


FGETC(3)                  Linux Programmer's Manual                 FGETC(3)

NAME         top

       fgetc, fgets, getc, getchar, ungetc - input of characters and strings

SYNOPSIS         top

       #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);

DESCRIPTION         top

       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).

RETURN VALUE         top

       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.

ATTRIBUTES         top

       For an explanation of the terms used in this section, see

       │Interface                 Attribute     Value   │
       │fgetc(), fgets(), getc(), │ Thread safety │ MT-Safe │
       │getchar(), ungetc()       │               │         │

CONFORMING TO         top

       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.

SEE ALSO         top

       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)

COLOPHON         top

       This page is part of release 5.08 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

GNU                              2017-09-15                         FGETC(3)

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