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Detect big/little endian in the configure script and adjust the ares_dns.h 

macros accordingly.
This commit is contained in:
Daniel Stenberg 2005-11-14 23:14:54 +00:00
parent 92c0de518e
commit 772b64d9d3
2 changed files with 23 additions and 2 deletions
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19
ares/ares_dns.h
View File

@ -18,7 +18,18 @@
#ifndef ARES__DNS_H
#define ARES__DNS_H
#if 0
#ifdef ARES_BIG_ENDIAN
/* big-endian aware versions */
#define DNS__16BIT(p) (((p)[1] << 8) | (p)[0])
#define DNS__32BIT(p) (((p)[3] << 24) | ((p)[2] << 16) | \
((p)[1] << 8) | (p)[0])
#define DNS__SET16BIT(p, v) (((p)[1] = ((v) >> 8) & 0xff), \
((p)[0] = (v) & 0xff))
#define DNS__SET32BIT(p, v) (((p)[3] = ((v) >> 24) & 0xff), \
((p)[2] = ((v) >> 16) & 0xff), \
((p)[1] = ((v) >> 8) & 0xff), \
((p)[0] = (v) & 0xff))
#else
#define DNS__16BIT(p) (((p)[0] << 8) | (p)[1])
#define DNS__32BIT(p) (((p)[0] << 24) | ((p)[1] << 16) | \
((p)[2] << 8) | (p)[3])
@ -28,7 +39,11 @@
((p)[1] = ((v) >> 16) & 0xff), \
((p)[2] = ((v) >> 8) & 0xff), \
((p)[3] = (v) & 0xff))
#else /* big-endian aware versions */
#endif
#if 0
/* we cannot use this approach on systems where we can't access 16/32 bit
data on un-aligned addresses */
#define DNS__16BIT(p) ntohs(*(unsigned short*)(p))
#define DNS__32BIT(p) ntohl(*(unsigned long*)(p))
#define DNS__SET16BIT(p, v) *(unsigned short*)(p) = htons(v)

6
ares/configure.ac
View File

@ -356,4 +356,10 @@ CARES_CHECK_GETSERVBYPORT_R
CURL_CHECK_NONBLOCKING_SOCKET
AC_C_BIGENDIAN(
[AC_DEFINE(ARES_BIG_ENDIAN, 1, [define this if ares is built for a big endian system])],
,
[AC_MSG_WARN([couldn't figure out endianess, assuming little endian!])]
)
AC_OUTPUT(Makefile)