FPARSELN(3) BSD Library Functions Manual FPARSELN(3)NAMEfparseln — return the next logical line from a stream
System Utilities Library (libutil, -lutil)
fparseln(FILE *stream, size_t *len, size_t *lineno, const char delim,
The fparseln() function returns a pointer to the next logical line from
the stream referenced by stream. This string is NUL terminated and it is
dynamically allocated on each invocation. It is the responsibility of
the caller to free the pointer.
By default, if a character is escaped, both it and the preceding escape
character will be present in the returned string. Various flags alter
The meaning of the arguments is as follows:
stream The stream to read from.
len If not NULL, the length of the string is stored in the memory
location to which it points.
lineno If not NULL, the value of the memory location to which is pointed
to, is incremented by the number of lines actually read from the
delim Contains the escape, continuation, and comment characters. If a
character is NUL then processing for that character is disabled.
If NULL, all characters default to values specified below. The
contents of delim is as follows:
delim The escape character, which defaults to \, is used to
remove any special meaning from the next character.
delim The continuation character, which defaults to \, is
used to indicate that the next line should be concate‐
nated with the current one if this character is the
last character on the current line and is not escaped.
delim The comment character, which defaults to #, if not
escaped indicates the beginning of a comment that
extends until the end of the current line.
flags If non-zero, alter the operation of fparseln(). The various
flags, which may be or-ed together, are:
FPARSELN_UNESCCOMM Remove escape preceding an escaped comment.
FPARSELN_UNESCCONT Remove escape preceding an escaped continua‐
FPARSELN_UNESCESC Remove escape preceding an escaped escape.
FPARSELN_UNESCREST Remove escape preceding any other character.
FPARSELN_UNESCALL All of the above.
Upon successful completion a pointer to the parsed line is returned; oth‐
erwise, NULL is returned.
The fparseln() function uses internally fgetln(3), so all error condi‐
tions that apply to fgetln(3), apply to fparseln(). In addition
fparseln() may set errno to ENOMEM and return NULL if it runs out of mem‐
The fparseln() function first appeared in NetBSD 1.4 and FreeBSD 4.0.
BSD December 1, 1997 BSD