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use do/while(0) around GetDBM macros

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* README.EXT: wrap GetDBM with do/while(0)
* README.EXT.ja: ditto
* ext/dbm/dbm.c: ditto, likewise for GetDBM2
* ext/gdbm/gdbm.c: ditto
* ext/sdbm/init.c: ditto
  [ruby-core:61217]

ref: http://c-faq.com/cpp/multistmt.html

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45260 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
normal 2014-03-02 22:50:31 +00:00
parent 60bfa43238
commit fd61a78303
6 changed files with 23 additions and 14 deletions
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9
ChangeLog
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@ -1,3 +1,12 @@
Mon Mar 3 07:47:17 2014 Eric Wong <e@80x24.org>
* README.EXT: wrap GetDBM with do/while(0)
* README.EXT.ja: ditto
* ext/dbm/dbm.c: ditto, likewise for GetDBM2
* ext/gdbm/gdbm.c: ditto
* ext/sdbm/init.c: ditto
[ruby-core:61217]
Mon Mar 3 07:17:31 2014 Zachary Scott <e@zzak.io>
* NEWS: [DOC] Update doc regarding filesystem load when flushing IO

4
README.EXT
View file

@ -683,10 +683,10 @@ wrapping DBM* directly, because we want to cache size information.
To retrieve the dbmdata structure from a Ruby object, we define the
following macro:
#define GetDBM(obj, dbmp) {\
#define GetDBM(obj, dbmp) do {\
Data_Get_Struct(obj, struct dbmdata, dbmp);\
if (dbmp->di_dbm == 0) closed_dbm();\
}
} while (0)
This sort of complicated macro does the retrieving and close checking for
the DBM.

4
README.EXT.ja
View file

@ -763,10 +763,10 @@ dbm.cではData_Make_Structを以下のように使っています．
Dataオブジェクトからdbmstruct構造体のポインタを取り出すため
に以下のマクロを使っています．
#define GetDBM(obj, dbmp) {\
#define GetDBM(obj, dbmp) do {\
Data_Get_Struct(obj, struct dbmdata, dbmp);\
if (dbmp->di_dbm == 0) closed_dbm();\
}
} while (0)
ちょっと複雑なマクロですが，要するにdbmdata構造体のポインタ
の取り出しと，closeされているかどうかのチェックをまとめてい

8
ext/dbm/dbm.c
View file

@ -45,16 +45,16 @@ closed_dbm(void)
rb_raise(rb_eDBMError, "closed DBM file");
}
#define GetDBM(obj, dbmp) {\
#define GetDBM(obj, dbmp) do {\
Data_Get_Struct((obj), struct dbmdata, (dbmp));\
if ((dbmp) == 0) closed_dbm();\
if ((dbmp)->di_dbm == 0) closed_dbm();\
}
} while (0)
#define GetDBM2(obj, data, dbm) {\
#define GetDBM2(obj, data, dbm) do {\
GetDBM((obj), (data));\
(dbm) = dbmp->di_dbm;\
}
} while (0)
static void
free_dbm(struct dbmdata *dbmp)

4
ext/gdbm/gdbm.c
View file

@ -106,10 +106,10 @@ closed_dbm(void)
if ((dbmp)->di_dbm == 0) closed_dbm();\
} while (0)
#define GetDBM2(obj, data, dbm) {\
#define GetDBM2(obj, data, dbm) do {\
GetDBM((obj), (data));\
(dbm) = dbmp->di_dbm;\
}
} while (0)
static void
free_dbm(struct dbmdata *dbmp)

8
ext/sdbm/init.c
View file

@ -77,16 +77,16 @@ closed_sdbm()
rb_raise(rb_eDBMError, "closed SDBM file");
}
#define GetDBM(obj, dbmp) {\
#define GetDBM(obj, dbmp) do {\
Data_Get_Struct((obj), struct dbmdata, (dbmp));\
if ((dbmp) == 0) closed_sdbm();\
if ((dbmp)->di_dbm == 0) closed_sdbm();\
}
} while (0)
#define GetDBM2(obj, data, dbm) {\
#define GetDBM2(obj, data, dbm) do {\
GetDBM((obj), (data));\
(dbm) = dbmp->di_dbm;\
}
} while (0)
static void
free_sdbm(struct dbmdata *dbmp)