From: Matthew Fernandez <matthew.fernandez@gmail.com>
Date: Sat, 22 Aug 2020 16:24:31 +0000 (-0700)
Subject: remove unused sfdcseekable
X-Git-Tag: 2.46.0~20^2^2~104^2
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=faee068a9d838f11233b9bd5d33cabb11f07f02b;p=graphviz

remove unused sfdcseekable
---

diff --git a/lib/sfio/Sfio_dc/Makefile.am b/lib/sfio/Sfio_dc/Makefile.am
index cda3060df..5ca2869b6 100644
--- a/lib/sfio/Sfio_dc/Makefile.am
+++ b/lib/sfio/Sfio_dc/Makefile.am
@@ -7,7 +7,7 @@ noinst_HEADERS = sfdchdr.h sfdisc.h
 noinst_LTLIBRARIES = libsfiodc_C.la
 
 libsfiodc_C_la_SOURCES = sfdcdos.c sfdcfilter.c sfdclzw.c \
-	sfdcseekable.c sfdcslow.c sfdcsubstream.c sfdctee.c sfdcunion.c
+	sfdcslow.c sfdcsubstream.c sfdctee.c sfdcunion.c
 
 ${top_builddir}/FEATURE/sfio:  ${top_srcdir}/lib/sfio/features/sfio
 	mkdir -p ${top_builddir}/FEATURE
diff --git a/lib/sfio/Sfio_dc/sfdcseekable.c b/lib/sfio/Sfio_dc/sfdcseekable.c
deleted file mode 100644
index 740a57241..000000000
--- a/lib/sfio/Sfio_dc/sfdcseekable.c
+++ /dev/null
@@ -1,164 +0,0 @@
-/* $Id$ $Revision$ */
-/* vim:set shiftwidth=4 ts=8: */
-
-/*************************************************************************
- * Copyright (c) 2011 AT&T Intellectual Property 
- * All rights reserved. This program and the accompanying materials
- * are made available under the terms of the Eclipse Public License v1.0
- * which accompanies this distribution, and is available at
- * http://www.eclipse.org/legal/epl-v10.html
- *
- * Contributors: See CVS logs. Details at http://www.graphviz.org/
- *************************************************************************/
-
-#include	<sfio/sfdchdr.h>
-
-/*	Discipline to make an unseekable read stream seekable
-**
-**	Written by Kiem-Phong Vo, kpv@research.att.com, 03/18/1998.
-*/
-
-typedef struct _skable_s {
-    Sfdisc_t disc;		/* sfio discipline */
-    Sfio_t *shadow;		/* to shadow data */
-    int eof;			/* if eof has been reached */
-} Seek_t;
-
-/**
- * @param f stream involved
- * @param buf buffer to read into
- * @param n number of bytes to read
- * @param disc discipline
- */
-static ssize_t skwrite(Sfio_t * f, const void * buf, size_t n,
-		       Sfdisc_t * disc)
-{
-    return (ssize_t) (-1);
-}
-
-/**
- * @param f stream involved
- * @param buf buffer to read into
- * @param n number of bytes to read
- * @param disc discipline
- */
-static ssize_t skread(Sfio_t * f, void * buf, size_t n, Sfdisc_t * disc)
-{
-    Seek_t *sk;
-    Sfio_t *sf;
-    Sfoff_t addr, extent;
-    ssize_t r, w;
-
-    sk = (Seek_t *) disc;
-    sf = sk->shadow;
-    if (sk->eof)
-	return sfread(sf, buf, n);
-
-    addr = sfseek(sf, (Sfoff_t) 0, 1);
-    extent = sfsize(sf);
-
-    if (addr + n <= extent)
-	return sfread(sf, buf, n);
-
-    if ((r = (ssize_t) (extent - addr)) > 0) {
-	if ((w = sfread(sf, buf, r)) != r)
-	    return w;
-	buf = (char *) buf + r;
-	n -= r;
-    }
-
-    /* do a raw read */
-    if ((w = sfrd(f, buf, n, disc)) <= 0) {
-	sk->eof = 1;
-	w = 0;
-    } else if (sfwrite(sf, buf, w) != w)
-	sk->eof = 1;
-
-    return r + w;
-}
-
-static Sfoff_t skseek(Sfio_t * f, Sfoff_t addr, int type, Sfdisc_t * disc)
-{
-    Sfoff_t extent;
-    Seek_t *sk;
-    Sfio_t *sf;
-    char buf[SF_BUFSIZE];
-    ssize_t r, w;
-
-    if (type < 0 || type > 2)
-	return (Sfoff_t) (-1);
-
-    sk = (Seek_t *) disc;
-    sf = sk->shadow;
-
-    extent = sfseek(sf, (Sfoff_t) 0, 2);
-    if (type == 1)
-	addr += sftell(sf);
-    else if (type == 2)
-	addr += extent;
-
-    if (addr < 0)
-	return (Sfoff_t) (-1);
-    else if (addr > extent) {
-	if (sk->eof)
-	    return (Sfoff_t) (-1);
-
-	/* read enough to reach the seek point */
-	while (addr > extent) {
-	    if (addr > extent + sizeof(buf))
-		w = sizeof(buf);
-	    else
-		w = (int) (addr - extent);
-	    if ((r = sfrd(f, buf, w, disc)) <= 0)
-		w = r - 1;
-	    else if ((w = sfwrite(sf, buf, r)) > 0)
-		extent += r;
-	    if (w != r) {
-		sk->eof = 1;
-		break;
-	    }
-	}
-
-	if (addr > extent)
-	    return (Sfoff_t) (-1);
-    }
-
-    return sfseek(sf, addr, 0);
-}
-
-/* on close, remove the discipline */
-static int skexcept(Sfio_t * f, int type, void * data, Sfdisc_t * disc)
-{
-    if (type == SF_FINAL || type == SF_DPOP) {
-	sfclose(((Seek_t *) disc)->shadow);
-	free(disc);
-    }
-    return 0;
-}
-
-int sfdcseekable(Sfio_t * f)
-{
-    Seek_t *sk;
-
-    /* see if already seekable */
-    if (sfseek(f, (Sfoff_t) 0, 1) >= 0)
-	return 0;
-
-    if (!(sk = (Seek_t *) malloc(sizeof(Seek_t))))
-	return -1;
-
-    sk->disc.readf = skread;
-    sk->disc.writef = skwrite;
-    sk->disc.seekf = skseek;
-    sk->disc.exceptf = skexcept;
-    sk->shadow = sftmp(SF_BUFSIZE);
-    sk->eof = 0;
-
-    if (sfdisc(f, (Sfdisc_t *) sk) != (Sfdisc_t *) sk) {
-	sfclose(sk->shadow);
-	free(sk);
-	return -1;
-    }
-
-    return 0;
-}
diff --git a/lib/sfio/Sfio_dc/sfdisc.h b/lib/sfio/Sfio_dc/sfdisc.h
index 9e12e872b..b7de9c5ce 100644
--- a/lib/sfio/Sfio_dc/sfdisc.h
+++ b/lib/sfio/Sfio_dc/sfdisc.h
@@ -24,7 +24,6 @@ extern "C" {
     extern int sfdcdos(Sfio_t *);
     extern int sfdcfilter(Sfio_t *, const char *);
     extern int sfdclzw(Sfio_t *);
-    extern int sfdcseekable(Sfio_t *);
     extern int sfdcslow(Sfio_t *);
     extern int sfdcsubstream(Sfio_t *, Sfio_t *, Sfoff_t, Sfoff_t);
     extern int sfdctee(Sfio_t *, Sfio_t *);