File 186.patch of Package transfig

From c8a87d22036e62bac0c6f7836078d8103caa6457 Mon Sep 17 00:00:00 2001
From: Thomas Loimer <thomas.loimer@tuwien.ac.at>
Date: Wed, 22 Jan 2025 23:27:43 +0100
Subject: [PATCH] Reject arcs with co-incident points, ticket #186

---
 fig2dev/object.h      |   16 ++++++++++------
 fig2dev/tests/read.at |   14 ++++++++++++--
 2 files changed, 22 insertions(+), 8 deletions(-)

--- fig2dev/object.h
+++ fig2dev/object.h	2025-04-29 11:58:54.335653487 +0000
@@ -3,7 +3,7 @@
  * Copyright (c) 1991 by Micah Beck
  * Parts Copyright (c) 1985-1988 by Supoj Sutanthavibul
  * Parts Copyright (c) 1989-2015 by Brian V. Smith
- * Parts Copyright (c) 2015-2023 by Thomas Loimer
+ * Parts Copyright (c) 2015-2025 by Thomas Loimer
  *
  * Any party obtaining a copy of these files is granted, free of charge, a
  * full and unrestricted irrevocable, world-wide, paid up, royalty-free,
@@ -92,10 +92,10 @@ typedef struct f_ellipse {
 	struct f_ellipse	*next;
 } F_ellipse;
 
-#define INVALID_ELLIPSE(e)	\
+#define INVALID_ELLIPSE(e)						\
 	e->type < T_ELLIPSE_BY_RAD || e->type > T_CIRCLE_BY_DIA ||	\
-	COMMON_PROPERTIES(e) || (e->direction != 1 && e->direction != 0) || \
-	e->radiuses.x == 0 || e->radiuses.y == 0 || \
+	COMMON_PROPERTIES(e) || (e->direction != 1 && e->direction != 0) ||  \
+	e->radiuses.x == 0 || e->radiuses.y == 0 ||			\
 	e->angle < -7. || e->angle > 7.
 
 typedef struct f_arc {
@@ -122,12 +122,16 @@ typedef struct f_arc {
 	struct f_arc		*next;
 } F_arc;
 
-#define INVALID_ARC(a)	\
+#define COINCIDENT(a, b)	(a.x == b.x && a.y == b.y)
+#define INVALID_ARC(a)							\
 	a->type < T_OPEN_ARC || a->type > T_PIE_WEDGE_ARC ||		\
 	COMMON_PROPERTIES(a) || a->cap_style < 0 || a->cap_style > 2 ||	\
 	a->center.x < COORD_MIN || a->center.x > COORD_MAX ||		\
 	a->center.y < COORD_MIN || a->center.y > COORD_MAX ||		\
-	(a->direction != 0 && a->direction != 1)
+	(a->direction != 0 && a->direction != 1) ||			\
+	COINCIDENT(a->point[0], a->point[1]) ||				\
+	COINCIDENT(a->point[0], a->point[2]) ||				\
+	COINCIDENT(a->point[1], a->point[2])
 
 typedef struct f_line {
 	int			type;
--- fig2dev/tests/read.at
+++ fig2dev/tests/read.at	2025-04-29 11:58:54.335653487 +0000
@@ -2,7 +2,7 @@ dnl Fig2dev: Translate Fig code to vario
 dnl Copyright (c) 1991 by Micah Beck
 dnl Parts Copyright (c) 1985-1988 by Supoj Sutanthavibul
 dnl Parts Copyright (c) 1989-2015 by Brian V. Smith
-dnl Parts Copyright (c) 2015-2024 by Thomas Loimer
+dnl Parts Copyright (c) 2015-2025 by Thomas Loimer
 dnl
 dnl Any party obtaining a copy of these files is granted, free of charge, a
 dnl full and unrestricted irrevocable, world-wide, paid up, royalty-free,
@@ -14,7 +14,7 @@ dnl party to do so, with the only requir
 dnl and this permission notice remain intact.
 
 dnl read.at
-dnl Author: Thomas Loimer, 2017-2024
+dnl Author: Thomas Loimer, 2017-2025
 
 
 AT_BANNER([Sanitize and harden input.])
@@ -246,6 +246,16 @@ FIG_FILE_TOP
 EOF
 ], 1, ignore, [Invalid arc object at line 10.
 ])
+AT_CLEANUP
+
+AT_SETUP([reject arcs with coincident points, ticket #186])
+AT_KEYWORDS(read.c arc)
+AT_CHECK([fig2dev -L pict2e <<EOF
+FIG_FILE_TOP
+5 1 0 15 0 7 50 0 -1 0.0 1 0 0 0 0.0 0.0 1 1 1 1 2 0
+EOF
+], 1, ignore, [Invalid arc object at line 10.
+])
 AT_CLEANUP
 
 AT_SETUP([survive debian bugs #881143, #881144])