fgetln(3) [osx man page]

FGETLN(3)						   BSD Library Functions Manual 						 FGETLN(3)

NAME

     fgetln -- get a line from a stream

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <stdio.h>

     char *
     fgetln(FILE *stream, size_t *len);

DESCRIPTION

     The fgetln() function returns a pointer to the next line from the stream referenced by stream.  This line is not a C string as it does not
     end with a terminating NUL character.  The length of the line, including the final newline, is stored in the memory location to which len
     points.  (Note, however, that if the line is the last in a file that does not end in a newline, the returned text will not contain a new-
     line.)

RETURN VALUES

     Upon successful completion a pointer is returned; this pointer becomes invalid after the next I/O operation on stream (whether successful or
     not) or as soon as the stream is closed.  Otherwise, NULL is returned.  The fgetln() function does not distinguish between end-of-file and
     error; the routines feof(3) and ferror(3) must be used to determine which occurred.  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 NULL until
     the condition is cleared with clearerr(3).

     The text to which the returned pointer points may be modified, provided that no changes are made beyond the returned size.  These changes are
     lost as soon as the pointer becomes invalid.

ERRORS

     [EBADF]		The argument stream is not a stream open for reading.

     [ENOMEM]		The internal line buffer could not be expanded due to lack of available memory, or because it would need to expand beyond
			INT_MAX in size.

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

SEE ALSO

     ferror(3), fgets(3), fgetwln(3), fopen(3), getline(3), putc(3)

HISTORY

     The fgetln() function first appeared in 4.4BSD.

BSD
								  April 19, 1994							       BSD

FGETS(3)						   BSD Library Functions Manual 						  FGETS(3)

NAME

     fgets, gets -- get a line from a stream

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <stdio.h>

     char *
     fgets(char * restrict str, int size, FILE * restrict 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.	If any characters
     are read and there is no error, a '' 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 occurs before any characters are read, they
     return NULL and the buffer contents remain unchanged.  If an error occurs, they return NULL and the buffer contents are indeterminate.  The
     fgets() and gets() functions 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), fgetws(3), getline(3)

STANDARDS

     The functions fgets() and gets() conform to ISO/IEC 9899:1999 (``ISO C99'').

SECURITY CONSIDERATIONS

     The gets() function cannot be used securely.  Because of its lack of bounds checking, and the inability for the calling program to reliably
     determine the length of the next incoming line, the use of this function enables malicious users to arbitrarily change a running program's
     functionality through a buffer overflow attack.  It is strongly suggested that the fgets() function be used in all cases.

BSD
								    May 5, 2012 							       BSD