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Issue #16166: Add PY_LITTLE_ENDIAN and PY_BIG_ENDIAN macros and unified

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endianess detection and handling.
This commit is contained in:
Christian Heimes 2012-10-17 23:52:17 +02:00
parent 1e9af84e2e
commit 743e0cd6b5
15 changed files with 78 additions and 107 deletions
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21
Modules/_struct.c
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@ -1199,12 +1199,11 @@ whichtable(char **pfmt)
case '!': /* Network byte order is big-endian */
return bigendian_table;
case '=': { /* Host byte order -- different from native in alignment! */
int n = 1;
char *p = (char *) &n;
if (*p == 1)
return lilendian_table;
else
return bigendian_table;
#if PY_LITTLE_ENDIAN
return lilendian_table;
#else
return bigendian_table;
#endif
}
default:
--*pfmt; /* Back out of pointer increment */
@ -2088,13 +2087,13 @@ PyInit__struct(void)
/* Check endian and swap in faster functions */
{
int one = 1;
formatdef *native = native_table;
formatdef *other, *ptr;
if ((int)*(unsigned char*)&one)
other = lilendian_table;
else
other = bigendian_table;
#if PY_LITTLE_ENDIAN
other = lilendian_table;
#else
other = bigendian_table;
#endif
/* Scan through the native table, find a matching
entry in the endian table and swap in the
native implementations whenever possible