.\" $NetBSD: fparseln.3,v 1.7 1999/07/02 15:49:12 simonb Exp $ .\" $FreeBSD: src/lib/libutil/fparseln.3,v 1.9 2001/10/01 16:09:18 ru Exp $ .\" .\" Copyright (c) 1997 Christos Zoulas. All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" 3. All advertising materials mentioning features or use of this software .\" must display the following acknowledgement: .\" This product includes software developed by Christos Zoulas. .\" 4. The name of the author may not be used to endorse or promote products .\" derived from this software without specific prior written permission. .\" .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR .\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES .\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. .\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, .\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT .\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, .\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY .\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. .\" .Dd December 1, 1997 .Dt FPARSELN 3 .Os .Sh NAME .Nm fparseln .Nd return the next logical line from a stream .Sh LIBRARY .Lb libc .Sh SYNOPSIS .In stdio.h .In util.h .Ft "char *" .Fo fparseln .Fa "FILE *stream" "size_t *len" "size_t *lineno" .Fa "const char delim" "int flags" .Fc .Sh DESCRIPTION The .Fn fparseln function returns a pointer to the next logical line from the stream referenced by .Fa stream . This string is .Dv NUL terminated and it is dynamically allocated on each invocation. It is the responsibility of the caller to free the pointer. .Pp By default, if a character is escaped, both it and the preceding escape character will be present in the returned string. Various .Fa flags alter this behaviour. .Pp The meaning of the arguments is as follows: .Bl -tag -width "lineno" .It Fa stream The stream to read from. .It Fa len If not .Dv NULL , the length of the string is stored in the memory location to which it points. .It Fa lineno If not .Dv NULL , the value of the memory location to which is pointed to, is incremented by the number of lines actually read from the file. .It Fa delim Contains the escape, continuation, and comment characters. If a character is .Dv NUL then processing for that character is disabled. If .Dv NULL , all characters default to values specified below. The contents of .Fa delim is as follows: .Bl -tag -width "delim" .It Fa delim The escape character, which defaults to .Cm \e , is used to remove any special meaning from the next character. .It Fa delim The continuation character, which defaults to .Cm \e , is used to indicate that the next line should be concatenated with the current one if this character is the last character on the current line and is not escaped. .It Fa delim The comment character, which defaults to .Cm # , if not escaped indicates the beginning of a comment that extends until the end of the current line. .El .It Fa flags If non-zero, alter the operation of .Fn fparseln . The various flags, which may be .Em or Ns -ed together, are: .Bl -tag -width "FPARSELN_UNESCCOMM" .It Dv FPARSELN_UNESCCOMM Remove escape preceding an escaped comment. .It Dv FPARSELN_UNESCCONT Remove escape preceding an escaped continuation. .It Dv FPARSELN_UNESCESC Remove escape preceding an escaped escape. .It Dv FPARSELN_UNESCREST Remove escape preceding any other character. .It Dv FPARSELN_UNESCALL All of the above. .El .Pp .El .Sh RETURN VALUES Upon successful completion a pointer to the parsed line is returned; otherwise, .Dv NULL is returned. .Pp The .Fn fparseln function uses internally .Xr fgetln 3 , so all error conditions that apply to .Xr fgetln 3 , apply to .Fn fparseln . In addition .Fn fparseln may set .Va errno to .Er ENOMEM and return .Dv NULL if it runs out of memory. .Sh SEE ALSO .Xr fgetln 3 .Sh HISTORY The .Fn fparseln function first appeared in .Nx 1.4 .