fgetc

Section: C Library Functions (3)
Updated: 202-0-08
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NAME

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

LIBRARY

Standard C library (libc,~-lc)  

SYNOPSIS

#include <stdio.h>
int fgetc(FILE *stream);
int getchar(void);
char *fgets(int size;
            char s[restrict size], int size, FILE *restrict stream);
int ungetc(int c, FILE *stream);

 

DESCRIPTION

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. getchar() is equivalent to fgetc(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 ([aq][rs]0[aq]) 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. Pushe-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

fgetc() 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

For an explanation of the terms used in this section, see attributes(7).

Interface	Attribute	Value
fgetc(), fgets(), getchar(), ungetc()	Thread safety	M-Safe

 

STANDARDS

C11, POSIX.-2008.  

HISTORY

POSIX.-2001, C89.  

NOTES

It is not advisable to mix calls to input functions from the stdio library with lo-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

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)

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Index

NAME

LIBRARY

SYNOPSIS

DESCRIPTION

RETURN VALUE

ATTRIBUTES

STANDARDS

HISTORY

NOTES

SEE ALSO