FGETS(3)

NAME
fgets, gets - get a line from a stream

LIBRARY
libc

SYNOPSIS
#include <stdio.h>
char *
fgets(char *str, int size, FILE *stream);
char *
gets(char *str);

DESCRIPTION
The fgets() function reads at most one less than the number of characters specified by size from the given stream and stores them in the string str. Reading stops when a newline character is found, at end-of-file or error. The newline, if any, is retained. In any case a ‘\0’ character is appended to end the string.

The gets() function is equivalent to fgets() with an infinite size and a stream of stdin, except that the newline character (if any) is not stored in the string. It is the caller's responsibility to ensure that the input line, if any, is sufficiently short to fit in the string.

RETURN VALUES

Upon successful completion, fgets() and gets() return a pointer to the string. If end-of-file or an error occurs before any characters are read, they return NULL. The fgets() and functions gets() do not distinguish between end-of-file and error, and callers must use feof(3) and ferror(3) to determine which occurred.

ERRORS

[EBADF]
    The given stream is not a readable stream.

The function fgets() may also fail and set errno for any of the errors specified for the routines fflush(3), fstat(2), read(2), or malloc(3).

The function gets() may also fail and set errno for any of the errors specified for the routine getchar(3).

SEE ALSO
feof(3), ferror(3), fgetln(3)

STANDARDS
The functions fgets() and gets() conform to ansiC.

SECURITY CONSIDERATIONS
Since it is usually impossible to ensure that the next input line is less than some arbitrary length, and because overflowing the input buffer is almost invariably a security violation, programs should NEVER use gets(). The gets() function exists purely to conform to ansiC.