Portability fixes for SCO and HPUX

Change TRUNCATE(number) to truncate towards zero for negative numbers
Fix NULL handling for DESCRIBE table_name


Docs/manual.texi:
  Update of TRUNCATE() information
configure.in:
  Fix for HPUX
extra/resolveip.c:
  Fix for SCO
include/my_net.h:
  Fix for HPUX
libmysql/libmysql.c:
  Removed warning on HPUX 10.20
mysql-test/r/func_math.result:
  Test of new TRUNCATE handling
mysql-test/t/func_math.test:
  Test of new TRUNCATE handling
mysys/my_gethostbyname.c:
  Portability fix
sql/item_func.cc:
  Change TRUNCATE(number) to truncate towards zero for negative numbers
sql/sql_show.cc:
  Fix NULL handling for DESCRIBE table_name

Docs/manual.texi

@@ -31150,6 +31150,17 @@ mysql> select TRUNCATE(1.999,1);
         -> 1.9
 mysql> select TRUNCATE(1.999,0);
         -> 1
+mysql> select TRUNCATE(-1,999,1);
+        -> -1.9
+@end example
+
+Starting from MySQL 3.23.51 all numbers are rounded towards zero.
+
+If @code{D} is negative, then the whole part of the number is zeroed out:
+
+@example
+mysql> select truncate(122,-2);
+       -> 100
 @end example
 
 Note that as decimal numbers are normally not stored as exact numbers in
@@ -46916,6 +46927,11 @@ not yet 100% confident in this code.
 @appendixsubsec Changes in release 3.23.51
 @itemize @bullet
 @item
+Cleaned up @code{NULL} handling for default values in @code{DESCRIBE
+table_name}.
+@item
+Fixed @code{truncate()} to round up negative values to the nearest integer.
+@item
 Remove end space from @code{enum} values. (This fixed a problem with
 @code{SHOW CREATE TABLE}).
 @item

configure.in

@@ -1552,7 +1552,7 @@ then
 fi
 AC_TRY_COMPILE(
 [#undef inline
-#if !defined(SCO) && !defined(__osf__)
+#if !defined(SCO) && !defined(__osf__) && !defined(_REENTRANT)
 #define _REENTRANT
 #endif
 #include <pthread.h>
@@ -1585,7 +1585,7 @@ then
 fi
 AC_TRY_COMPILE(
 [#undef inline
-#if !defined(SCO) && !defined(__osf__)
+#if !defined(SCO) && !defined(__osf__) && !defined(_REENTRANT)
 #define _REENTRANT
 #endif
 #include <pthread.h>
@@ -1617,7 +1617,7 @@ then
 fi
 AC_TRY_COMPILE(
 [#undef inline
-#if !defined(SCO) && !defined(__osf__)
+#if !defined(SCO) && !defined(__osf__) && !defined(_REENTRANT)
 #define _REENTRANT
 #endif
 #include <pthread.h>
@@ -1643,7 +1643,7 @@ then
   # Check definition of pthread_getspecific
   AC_CACHE_CHECK("args to pthread_getspecific", mysql_cv_getspecific_args,
   AC_TRY_COMPILE(
-[#if !defined(SCO) && !defined(__osf__)
+[#if !defined(SCO) && !defined(__osf__) && !defined(_REENTRANT)
 #define _REENTRANT
 #endif
 #define _POSIX_PTHREAD_SEMANTICS 

extra/resolveip.c

@@ -20,7 +20,6 @@
 
 #include <my_global.h>
 #include <m_ctype.h>
-#include <my_net.h>
 #include <my_sys.h>
 #include <m_string.h>
 #include <sys/types.h>
@@ -30,6 +29,7 @@
 #endif
 #include <arpa/inet.h>
 #include <netdb.h>
+#include <my_net.h>
 #include <getopt.h>
 
 #if !defined(_AIX) && !defined(HAVE_UNIXWARE7_THREADS) && !defined(HAVE_UNIXWARE7_POSIX) && !defined(h_errno)

include/my_net.h

@@ -53,7 +53,7 @@ struct hostent *my_gethostbyname_r(const char *name,
 				   struct hostent *result, char *buffer,
 				   int buflen, int *h_errnop);
 #define my_gethostbyname_r_free()
-#if !defined(HAVE_GETHOSTBYNAME_R_GLIBC2_STYLE)
+#if !defined(HAVE_GETHOSTBYNAME_R_GLIBC2_STYLE) && !defined(HPUX)
 #define GETHOSTBYNAME_BUFF_SIZE sizeof(struct hostent_data)
 #endif /* !defined(HAVE_GETHOSTBYNAME_R_GLIBC2_STYLE) */
 

libmysql/libmysql.c

@@ -180,8 +180,13 @@ static int connect2(my_socket s, const struct sockaddr *name, uint namelen,
   {
     tv.tv_sec = (long) timeout;
     tv.tv_usec = 0;
+#if defined(HPUX) && defined(THREAD)
+    if ((res = select(s+1, NULL, (int*) &sfds, NULL, &tv)) >= 0)
+      break;
+#else
     if ((res = select(s+1, NULL, &sfds, NULL, &tv)) >= 0)
       break;
+#endif
     now_time=time(NULL);
     timeout-= (uint) (now_time - start_time);
     if (errno != EINTR || (int) timeout <= 0)

mysql-test/r/func_math.result

@@ -2,8 +2,8 @@ floor(5.5)	floor(-5.5)
 5	-6
 ceiling(5.5)	ceiling(-5.5)
 6	-5
-truncate(52.64,1)	truncate(52.64,2)	truncate(52.64,-1)	truncate(52.64,-2)
-52.6	52.64	50	0
+truncate(52.64,1)	truncate(52.64,2)	truncate(52.64,-1)	truncate(52.64,-2)	truncate(-52.64,1)	truncate(-52.64,-1)
+52.6	52.64	50	0	-52.6	-50
 round(5.5)	round(-5.5)
 6	-6
 round(5.64,1)	round(5.64,2)	round(5.64,-1)	round(5.64,-2)

mysql-test/t/func_math.test

@@ -4,7 +4,7 @@
 
 select floor(5.5),floor(-5.5);
 select ceiling(5.5),ceiling(-5.5);
-select truncate(52.64,1),truncate(52.64,2),truncate(52.64,-1),truncate(52.64,-2);
+select truncate(52.64,1),truncate(52.64,2),truncate(52.64,-1),truncate(52.64,-2), truncate(-52.64,1),truncate(-52.64,-1);
 select round(5.5),round(-5.5);
 select round(5.64,1),round(5.64,2),round(5.64,-1),round(5.64,-2);
 select abs(-10), sign(-5), sign(5), sign(0);

mysys/my_gethostbyname.c

@@ -20,10 +20,10 @@
 #include "mysys_priv.h"
 #include "my_pthread.h"
 #include <assert.h>
-#include <my_net.h>
 #if !defined(MSDOS) && !defined(__WIN__)
 #include <netdb.h>
 #endif
+#include <my_net.h>
 
 /* This file is not needed if my_gethostbyname_r is a macro */
 #if !defined(my_gethostbyname_r)

sql/item_func.cc

@@ -601,7 +601,12 @@ double Item_func_round::val()
 	      log_10[abs_dec] : pow(10.0,(double) abs_dec));
 
   if (truncate)
-    return dec < 0 ? floor(value/tmp)*tmp : floor(value*tmp)/tmp;
+  {
+    if (value >= 0)
+      return dec < 0 ? floor(value/tmp)*tmp : floor(value*tmp)/tmp;
+    else
+      return dec < 0 ? ceil(value/tmp)*tmp : ceil(value*tmp)/tmp;
+  }
   return dec < 0 ? rint(value/tmp)*tmp : rint(value*tmp)/tmp;
 }
 

sql/sql_show.cc

@@ -431,6 +431,7 @@ mysqld_show_fields(THD *thd, TABLE_LIST *table_list,const char *wild,
   TABLE *table;
   handler *file;
   char tmp[MAX_FIELD_WIDTH];
+  Item *item;
   DBUG_ENTER("mysqld_show_fields");
   DBUG_PRINT("enter",("db: %s  table: %s",table_list->db,
                       table_list->real_name));
@@ -449,7 +450,8 @@ mysqld_show_fields(THD *thd, TABLE_LIST *table_list,const char *wild,
   field_list.push_back(new Item_empty_string("Type",40));
   field_list.push_back(new Item_empty_string("Null",1));
   field_list.push_back(new Item_empty_string("Key",3));
-  field_list.push_back(new Item_empty_string("Default",NAME_LEN));
+  field_list.push_back(item=new Item_empty_string("Default",NAME_LEN));
+  item->maybe_null=1;
   field_list.push_back(new Item_empty_string("Extra",20));
   if (verbose)
     field_list.push_back(new Item_empty_string("Privileges",80));