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Experiments in making loadable extensions easier to program. The

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shared library filename tries various operating-system specific extensions
if the bare library name does not work.  And the entry point is derived
from the filename is the legacy entry point name "sqlite3_extension_init"
is not found.

FossilOrigin-Name: 6cfa1d73d79b9f0be8157f0a37c264dd95b031c8
This commit is contained in:
drh
2013-04-18 22:56:42 +00:00
parent 93c8c457e8
commit c288e442e3
4 changed files with 89 additions and 19 deletions
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15
src/sqlite.h.in
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@@ -5017,11 +5017,20 @@ int sqlite3_table_column_metadata(
** ^This interface loads an SQLite extension library from the named file.
**
** ^The sqlite3_load_extension() interface attempts to load an
** [SQLite extension] library contained in the file zFile.
** [SQLite extension] library contained in the file zFile. If
** the file cannot be loaded directly, attempts are made to load
** with various operating-system specific extensions added.
** So for example, if "samplelib" cannot be loaded, then names like
** "samplelib.so" or "samplelib.dylib" or "samplelib.dll" might
** be tried also.
**
** ^The entry point is zProc.
** ^zProc may be 0, in which case the name of the entry point
** defaults to "sqlite3_extension_init".
** ^(zProc may be 0, in which case SQLite will try to come up with an
** entry point name on its own. It first tries "sqlite3_extension_init".
** If that does not work, it constructs a name "sqlite3_X_init" where the
** X is consists of the lower-case equivalent of all ASCII alphabetic
** characters in the filename from the last "/" to the first following
** "." and omitting any initial "lib".)^
** ^The sqlite3_load_extension() interface returns
** [SQLITE_OK] on success and [SQLITE_ERROR] if something goes wrong.
** ^If an error occurs and pzErrMsg is not 0, then the