File d4util.h-make-swapinlineXX-more-robust-against-... of Package netcdf

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File d4util.h-make-swapinlineXX-more-robust-against-type-punning.patch of Package netcdf (Revision be22d152442f74d611e1df29f1b35ffc)

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From: Egbert Eich <eich@suse.com>
Date: Sat Jul 10 10:12:21 2021 +0200
Subject: d4util.h: make swapinlineXX more robust against type punning
Patch-mainline: Not yet
Git-repo: https://github.com/Unidata/netcdf-c
Git-commit: 169dbc5f1d79b58050a0f6c475244c6d9d0ecff0
References:

Since the type of ip is not known in a macro definition, use memcpy()
to copy from and to memory.

Signed-off-by: Egbert Eich <eich@suse.com>
Signed-off-by: Egbert Eich <eich@suse.de>
---
 libdap4/d4util.h | 40 ++++++++++++++++++++--------------------
 1 file changed, 20 insertions(+), 20 deletions(-)
diff --git a/libdap4/d4util.h b/libdap4/d4util.h
index cba660ee..6cc63fe8 100644
--- a/libdap4/d4util.h
+++ b/libdap4/d4util.h
@@ -25,39 +25,39 @@ typedef struct D4blob {d4size_t size; void* memory;} D4blob;
 /* signature: void swapinline16(void* ip) */
 #define swapinline16(ip) \
 { \
-    union {char b[2]; unsigned short i;} u; \
+    char b[2]; \
     char* src = (char*)(ip); \
-    u.b[0] = src[1]; \
-    u.b[1] = src[0]; \
-    *((unsigned short*)ip) = u.i; \
+    b[0] = src[1]; \
+    b[1] = src[0]; \
+    memcpy(ip, b, 2); \
 }
 
 /* signature: void swapinline32(void* ip) */
 #define swapinline32(ip) \
 { \
-    union {char b[4]; unsigned int i;} u; \
+    char b[4]; \
     char* src = (char*)(ip); \
-    u.b[0] = src[3]; \
-    u.b[1] = src[2]; \
-    u.b[2] = src[1]; \
-    u.b[3] = src[0]; \
-    *((unsigned int*)ip) = u.i; \
+    b[0] = src[3]; \
+    b[1] = src[2]; \
+    b[2] = src[1]; \
+    b[3] = src[0]; \
+    memcpy(ip, b, 4); \
 }
 
 /* signature: void swapinline64(void* ip) */
 #define swapinline64(ip) \
 { \
-    union {char b[8]; unsigned long long i;} u; \
+    char b[8]; \
     char* src = (char*)(ip); \
-    u.b[0] = src[7]; \
-    u.b[1] = src[6]; \
-    u.b[2] = src[5]; \
-    u.b[3] = src[4]; \
-    u.b[4] = src[3]; \
-    u.b[5] = src[2]; \
-    u.b[6] = src[1]; \
-    u.b[7] = src[0]; \
-    *((unsigned long long*)ip) = u.i; \
+    b[0] = src[7]; \
+    b[1] = src[6]; \
+    b[2] = src[5]; \
+    b[3] = src[4]; \
+    b[4] = src[3]; \
+    b[5] = src[2]; \
+    b[6] = src[1]; \
+    b[7] = src[0]; \
+    memcpy(ip, b, 8); \
 }
 
 /***************************************************/

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File d4util.h-make-swapinlineXX-more-robust-against-type-punning.patch of Package netcdf (Revision be22d152442f74d611e1df29f1b35ffc)

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