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/*-------------------------------------------------------------------------
* case_test.c
* Program to test Unicode case mapping functions.
*
* Portions Copyright (c) 2017-2025, PostgreSQL Global Development Group
*
* IDENTIFICATION
* src/common/unicode/case_test.c
*
*-------------------------------------------------------------------------
*/
#include "postgres_fe.h"
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wctype.h>
#ifdef USE_ICU
#include <unicode/uchar.h>
#endif
#include "common/unicode_case.h"
#include "common/unicode_category.h"
#include "common/unicode_version.h"
#ifdef USE_ICU
static void
icu_test_simple(pg_wchar code)
{
pg_wchar lower = unicode_lowercase_simple(code);
pg_wchar title = unicode_titlecase_simple(code);
pg_wchar upper = unicode_uppercase_simple(code);
pg_wchar iculower = u_tolower(code);
pg_wchar icutitle = u_totitle(code);
pg_wchar icuupper = u_toupper(code);
if (lower != iculower || title != icutitle || upper != icuupper)
{
printf("case_test: FAILURE for codepoint 0x%06x\n", code);
printf("case_test: Postgres lower/title/upper: 0x%06x/0x%06x/0x%06x\n",
lower, title, upper);
printf("case_test: ICU lower/title/upper: 0x%06x/0x%06x/0x%06x\n",
iculower, icutitle, icuupper);
printf("\n");
exit(1);
}
}
/*
* Exhaustively compare case mappings with the results from ICU.
*/
static void
test_icu(void)
{
int successful = 0;
int skipped_mismatch = 0;
for (pg_wchar code = 0; code <= 0x10ffff; code++)
{
pg_unicode_category category = unicode_category(code);
if (category != PG_U_UNASSIGNED)
{
uint8_t icu_category = u_charType(code);
if (icu_category == PG_U_UNASSIGNED)
{
skipped_mismatch++;
continue;
}
icu_test_simple(code);
successful++;
}
}
if (skipped_mismatch > 0)
printf("case_test: skipped %d codepoints unassigned in ICU due to Unicode version mismatch\n",
skipped_mismatch);
printf("case_test: ICU simple mapping test: %d codepoints successful\n",
successful);
}
#endif
static void
test_strlower(const char *test_string, const char *expected)
{
size_t src1len = strlen(test_string);
size_t src2len = -1; /* NUL-terminated */
size_t dst1len = strlen(expected);
size_t dst2len = strlen(expected) + 1; /* NUL-terminated */
char *src1 = malloc(src1len);
char *dst1 = malloc(dst1len);
char *src2 = strdup(test_string);
char *dst2 = malloc(dst2len);
size_t needed;
memcpy(src1, test_string, src1len); /* not NUL-terminated */
/* neither source nor destination are NUL-terminated */
memset(dst1, 0x7F, dst1len);
needed = unicode_strlower(dst1, dst1len, src1, src1len);
if (needed != strlen(expected))
{
printf("case_test: convert_case test1 FAILURE: needed %zu\n", needed);
exit(1);
}
if (memcmp(dst1, expected, dst1len) != 0)
{
printf("case_test: convert_case test1 FAILURE: test: '%s' result: '%.*s' expected: '%s'\n",
test_string, (int) dst1len, dst1, expected);
exit(1);
}
/* destination is NUL-terminated and source is not */
memset(dst2, 0x7F, dst2len);
needed = unicode_strlower(dst2, dst2len, src1, src1len);
if (needed != strlen(expected))
{
printf("case_test: convert_case test2 FAILURE: needed %zu\n", needed);
exit(1);
}
if (strcmp(dst2, expected) != 0)
{
printf("case_test: convert_case test2 FAILURE: test: '%s' result: '%s' expected: '%s'\n",
test_string, dst2, expected);
exit(1);
}
/* source is NUL-terminated and destination is not */
memset(dst1, 0x7F, dst1len);
needed = unicode_strlower(dst1, dst1len, src2, src2len);
if (needed != strlen(expected))
{
printf("case_test: convert_case test3 FAILURE: needed %zu\n", needed);
exit(1);
}
if (memcmp(dst1, expected, dst1len) != 0)
{
printf("case_test: convert_case test3 FAILURE: test: '%s' result: '%.*s' expected: '%s'\n",
test_string, (int) dst1len, dst1, expected);
exit(1);
}
/* both source and destination are NUL-terminated */
memset(dst2, 0x7F, dst2len);
needed = unicode_strlower(dst2, dst2len, src2, src2len);
if (needed != strlen(expected))
{
printf("case_test: convert_case test4 FAILURE: needed %zu\n", needed);
exit(1);
}
if (strcmp(dst2, expected) != 0)
{
printf("case_test: convert_case test4 FAILURE: test: '%s' result: '%s' expected: '%s'\n",
test_string, dst2, expected);
exit(1);
}
free(src1);
free(dst1);
free(src2);
free(dst2);
}
static void
test_convert_case()
{
/* test string with no case changes */
test_strlower("√∞", "√∞");
/* test string with case changes */
test_strlower("ABC", "abc");
/* test string with case changes and byte length changes */
test_strlower("ȺȺȺ", "ⱥⱥⱥ");
printf("case_test: convert_case: success\n");
}
int
main(int argc, char **argv)
{
printf("case_test: Postgres Unicode version:\t%s\n", PG_UNICODE_VERSION);
#ifdef USE_ICU
printf("case_test: ICU Unicode version:\t\t%s\n", U_UNICODE_VERSION);
test_icu();
#else
printf("case_test: ICU not available; skipping\n");
#endif
test_convert_case();
exit(0);
}
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