/*
  * xconv.c -- An SQLite3 C extension that uses libxconv to convert from
  * ISO 6937 to UTF-8.
  */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sqlite3ext.h>
#include <xconv.h>

SQLITE_EXTENSION_INIT1

void
sqlite_xconv(sqlite3_context *c, int argc, sqlite3_value **argv)
{
	char *src, *dst;
	size_t dlen;

	if (argc != 1 || !(src = (char *)sqlite3_value_text(argv[0])))
	{
		sqlite3_result_error(c, "xconv requires 1 parameter", -1);
		return;
	}

	dlen = strlen(src) + 20;
	if (!(dst = (char *)malloc(dlen)))
	{
		sqlite3_result_error(c, "malloc() failed", -1);
		return;
	}
	
	if (!xconv(src, dst, dlen))
	{
		free(dst);
		dst = strdup(src);
	}
	sqlite3_result_text(c, dst, -1, free);
}

int sqlite3_qxconv_init(sqlite3 *db, char **err,
    const sqlite3_api_routines *api)
{
	SQLITE_EXTENSION_INIT2(api);

	return sqlite3_create_function(db, "xconv", 1,
	    SQLITE_UTF8 | SQLITE_DETERMINISTIC, NULL,
	    sqlite_xconv, NULL, NULL);
}