pgsql: Split ECPGdo() in constituent parts

Split ECPGdo() in constituent parts

This splits ECPGdo() into ecpg_prologue(), ecpg_do() and
ecpg_epilogue(), and renames free_params() into ecpg_free_params() and
exports it.  This makes it possible for future code to use these
routines for their own purposes.

There is no user-visible functionality change here, only code
reorganization.

Zoltán Böszörményi

Reviewed by Antonin Houska.  Larger, older versions of this patch were
reviewed by Noah Misch and Michael Meskes.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/3291301385ee5e9ca38d70a68b93ce31cc2674ac

Modified Files
--------------
src/interfaces/ecpg/ecpglib/execute.c              |  228 ++++++++++++--------
src/interfaces/ecpg/ecpglib/extern.h               |   10 +
.../test/expected/compat_informix-rnull.stderr     |   34 +--
.../test/expected/compat_informix-sqlda.stderr     |    4 +-
.../expected/compat_informix-test_informix.stderr  |    8 +-
.../expected/compat_informix-test_informix2.stderr |    6 +-
.../ecpg/test/expected/pgtypeslib-dt_test.stderr   |    6 +-
.../ecpg/test/expected/pgtypeslib-nan_test.stderr  |   28 +--
.../ecpg/test/expected/pgtypeslib-num_test.stderr  |    2 +-
.../ecpg/test/expected/preproc-autoprep.stderr     |    8 +-
.../ecpg/test/expected/preproc-type.stderr         |    2 +-
src/interfaces/ecpg/test/expected/sql-array.stderr |   14 +-
.../ecpg/test/expected/sql-binary.stderr           |    8 +-
.../ecpg/test/expected/sql-code100.stderr          |   20 +-
src/interfaces/ecpg/test/expected/sql-desc.stderr  |   22 +-
.../ecpg/test/expected/sql-execute.stderr          |    6 +-
src/interfaces/ecpg/test/expected/sql-fetch.stderr |    2 +-
.../ecpg/test/expected/sql-indicators.stderr       |    6 +-
.../ecpg/test/expected/sql-oldexec.stderr          |    4 +-
src/interfaces/ecpg/test/expected/sql-sqlda.stderr |    4 +-
20 files changed, 246 insertions(+), 176 deletions(-)