diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/backend/commands/copy.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/src/backend/commands/copy.c b/src/backend/commands/copy.c index 4f4b8474b09..7840e7b52cf 100644 --- a/src/backend/commands/copy.c +++ b/src/backend/commands/copy.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/commands/copy.c,v 1.310 2009/06/03 14:48:33 momjian Exp $ + * $PostgreSQL: pgsql/src/backend/commands/copy.c,v 1.311 2009/06/03 15:06:48 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -175,11 +175,13 @@ typedef struct /* * These macros centralize code used to process line_buf and raw_buf buffers. * They are macros because they often do continue/break control and to avoid - * function call overhead in tight COPY loops. "((void) 0)" is used to silence - * compiler warnings. + * function call overhead in tight COPY loops. * - * We must use "if (1)" because "do {} while(0)" overrides the continue/break - * processing. See http://www.cit.gu.edu.au/~anthony/info/C/C.macros. + * We must use "if (1)" because the usual "do {...} while(0)" wrapper would + * prevent the continue/break processing from working. We end the "if (1)" + * with "else ((void) 0)" to ensure the "if" does not unintentionally match + * any "else" in the calling code, and to avoid any compiler warnings about + * empty statements. See http://www.cit.gu.edu.au/~anthony/info/C/C.macros. */ /* |