From aede8ce4ce1acdaa3d68a06ca40bd9543f96169f Mon Sep 17 00:00:00 2001
From: ellson <devnull@localhost>
Date: Thu, 26 Feb 2009 13:08:02 +0000
Subject: [PATCH] Simplify output discipline slightly by using system
 fwrite()'s template exactly.

---
 lib/graph/attribs.c  | 15 ++-------------
 lib/graph/graph.h    |  4 +++-
 lib/graph/graphio.c  | 15 +++++++++------
 lib/graph/libgraph.h |  4 ++--
 lib/gvc/gvdevice.c   | 12 +++++++++---
 5 files changed, 25 insertions(+), 25 deletions(-)

diff --git a/lib/graph/attribs.c b/lib/graph/attribs.c
index 35fe9948b..72954d63c 100644
--- a/lib/graph/attribs.c
+++ b/lib/graph/attribs.c
@@ -324,17 +324,6 @@ Agsym_t *agprvattr(void *obj, Agsym_t *a)
 	return (Agsym_t *)dtprev(dict->dict, a);
 }
 
-static size_t agfwrite(FILE *fp, const char *s, size_t len)
-{
-        return fwrite(s, sizeof(char), len, fp);
-}
-
-static int agferror(FILE *fp)
-{
-        return ferror(fp);
-}
-
-
 	/* this is normally called by the aginit() macro */
 void aginitlib(int gs, int ns, int es)
 {
@@ -343,8 +332,8 @@ void aginitlib(int gs, int ns, int es)
 	AG.node_nbytes = ns;
 	AG.edge_nbytes = es;
 	AG.init_called = TRUE;
-	AG.fwrite = agfwrite;
-	AG.ferror = agferror;
+	AG.fwrite = fwrite;   /* init to system version of fwrite() */
+	AG.ferror = ferror;   /* init to system version of ferror() */
 	initproto();
     } else
 	if ((AG.graph_nbytes != gs) || (AG.node_nbytes != ns)
diff --git a/lib/graph/graph.h b/lib/graph/graph.h
index 824493e83..52ed60dbe 100644
--- a/lib/graph/graph.h
+++ b/lib/graph/graph.h
@@ -163,7 +163,9 @@ extern "C" {
     extern void agreadline(int);
     extern void agsetfile(char *);
     extern Agraph_t *agmemread(char *);
-    extern void agsetodisc(size_t (*fwrite) (FILE *fp, const char *s, size_t len), int (*ferror) (FILE *fp));
+    extern void agsetodisc(
+	size_t (*myfwrite) (const void *ptr, size_t size, size_t nmemb, FILE *stream),
+	int (*myferror) (FILE *stream) );
     extern void agfprintf(FILE *fp, const char *format, ...);
     extern int agputs(const char *s, FILE *fp);
     extern int agputc(int c, FILE *fp);
diff --git a/lib/graph/graphio.c b/lib/graph/graphio.c
index 4edef00a2..f97d4d3d3 100644
--- a/lib/graph/graphio.c
+++ b/lib/graph/graphio.c
@@ -177,10 +177,13 @@ char *agstrcanon(char *arg, char *buf)
 	return (_agstrcanon(arg, buf));
 }
 
-void agsetodisc(size_t (*fwrite) (FILE *fp, const char *s, size_t len), int (*ferror) (FILE *fp))
+void agsetodisc(
+    size_t (*myfwrite) (const void *ptr, size_t size, size_t nmemb, FILE *stream),
+    int (*myferror) (FILE *stream)
+)
 {
-	AG.fwrite = fwrite;
-	AG.ferror = ferror;
+    AG.fwrite = myfwrite;
+    AG.ferror = myferror;
 }
 
 /* agfprintf:
@@ -204,14 +207,14 @@ void agfprintf(FILE *fp, const char *format, ...)
 #endif
     va_end(argp);
 
-    AG.fwrite(fp, buf, len);
+    AG.fwrite(buf, sizeof(char), len, fp);
 }
 
 int agputs(const char *s, FILE *fp)
 {
     size_t len = strlen(s);
 
-    if (AG.fwrite(fp, s, len) != len) {
+    if (AG.fwrite(s, sizeof(char), len, fp) != len) {
 	return EOF;
     }
     return +1;
@@ -222,7 +225,7 @@ int agputc(int c, FILE *fp)
 {
     const char cc = c;
 
-    if (AG.fwrite (fp, &cc, 1) != 1) {
+    if (AG.fwrite (&cc, sizeof(char), 1, fp) != 1) {
 	return EOF;
     }
     return c;
diff --git a/lib/graph/libgraph.h b/lib/graph/libgraph.h
index ec1ce104e..83563a070 100644
--- a/lib/graph/libgraph.h
+++ b/lib/graph/libgraph.h
@@ -129,8 +129,8 @@ extern "C" {
 	char *linebuf;
 	short syntax_errors;
 	unsigned char accepting_state, init_called;
-	size_t (*fwrite) (FILE *fp, const char *s, size_t len);
-	int (*ferror) (FILE *fp);
+	size_t (*fwrite) (const void *ptr, size_t size, size_t nmemb, FILE *stream);
+	int (*ferror) (FILE *stream);
     } AG;
 
 /* follow structs used in graph parser */
diff --git a/lib/gvc/gvdevice.c b/lib/gvc/gvdevice.c
index 1b39e3d80..af5cac645 100644
--- a/lib/gvc/gvdevice.c
+++ b/lib/gvc/gvdevice.c
@@ -252,14 +252,20 @@ size_t gvwrite (GVJ_t * job, const char *s, size_t len)
     return len;
 }
 
-int gvferror (FILE* fp)
+int gvferror (FILE* stream)
 {
+    GVJ_t *job = (GVJ_t*)stream;
+
+    if (!job->gvc->write_fn && !job->output_data)
+	return ferror(job->output_file);
+
     return 0;
 }
 
-size_t gvfwrite (FILE* fp, const char *s, size_t len)
+size_t gvfwrite (const void *ptr, size_t size, size_t nmemb, FILE *stream)
 {
-    return gvwrite((GVJ_t*)fp, s, len);
+    assert(size = sizeof(char));
+    return gvwrite((GVJ_t*)stream, ptr, nmemb);
 }
 
 int gvputs(GVJ_t * job, const char *s)
-- 
2.40.0