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sqlite3-xconv
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Add utf8conv function to decode/strip prefixes from database strings

This commit is contained in:
prpr 2022-09-24 01:14:14 +01:00
parent f64d0ac615
commit 1355c16cd4
1 changed files with 55 additions and 5 deletions
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60
xconv.c
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@ -2,7 +2,6 @@
* 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>
@ -22,28 +21,79 @@ sqlite_xconv(sqlite3_context *c, int argc, sqlite3_value **argv)
return;
}
dlen = strlen(src) + 20;
dlen = strlen(src) * 2 + 14;
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);
}
void
sqlite_utf8conv(sqlite3_context *c, int argc, sqlite3_value **argv)
{
char *src, *dst;
if (argc != 1 || !(src = (char *)sqlite3_value_text(argv[0])))
{
sqlite3_result_error(c, "utf8conv requires 1 parameter", -1);
return;
}
if (src[0] == 0x10)
{
if (src[1] == 'i' && src[2] == '7')
{
size_t dlen;
src += 3;
dlen = strlen(src) * 2 + 14;
if (!(dst = (char *)malloc(dlen)))
{
sqlite3_result_error(c, "malloc() failed", -1);
return;
}
if (!xconv(src, dst, dlen))
{
free(dst);
dst = strdup(src);
}
}
else
dst = strdup("");
}
else
{
if (*src < 0x20)
src += *src == 0x1F ? 2 : 1;
dst = strdup(src);
}
sqlite3_result_text(c, dst, -1, free);
}
int sqlite3_xconv_init(sqlite3 *db, char **err,
const sqlite3_api_routines *api)
{
SQLITE_EXTENSION_INIT2(api);
int rc1, rc2;
return sqlite3_create_function(db, "xconv", 1,
SQLITE_EXTENSION_INIT2(api);
rc1 = sqlite3_create_function(db, "xconv", 1,
SQLITE_UTF8 | SQLITE_DETERMINISTIC, NULL,
sqlite_xconv, NULL, NULL);
rc2 = sqlite3_create_function(db, "utf8conv", 1,
SQLITE_UTF8 | SQLITE_DETERMINISTIC, NULL,
sqlite_utf8conv, NULL, NULL);
return rc1 != SQLITE_OK && rc2 != SQLITE_OK ? rc1 : SQLITE_OK;
}