case_test.c

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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/ucasemap.h>
#include <unicode/uchar.h>
#endif
#include "common/unicode_case.h"
#include "common/unicode_category.h"
#include "common/unicode_version.h"
 
/* enough to hold largest source or result string, including NUL */
#define BUFSZ 256
 
#ifdef USE_ICU
static UCaseMap * casemap = NULL;
#endif
 
typedef size_t (*TestFunc) (char *dst, size_t dstsize, const char *src,
                            ssize_t srclen);
 
/* simple boundary iterator copied from pg_locale_builtin.c */
struct WordBoundaryState
{
    const char *str;
    size_t      len;
    size_t      offset;
    bool        posix;
    bool        init;
    bool        prev_alnum;
};
 
static size_t
initcap_wbnext(void *state)
{
    struct WordBoundaryState *wbstate = (struct WordBoundaryState *) state;
 
    while (wbstate->offset < wbstate->len &&
           wbstate->str[wbstate->offset] != '\0')
    {
        pg_wchar    u = utf8_to_unicode((unsigned char *) wbstate->str +
                                        wbstate->offset);
        bool        curr_alnum = pg_u_isalnum(u, wbstate->posix);
 
        if (!wbstate->init || curr_alnum != wbstate->prev_alnum)
        {
            size_t      prev_offset = wbstate->offset;
 
            wbstate->init = true;
            wbstate->offset += unicode_utf8len(u);
            wbstate->prev_alnum = curr_alnum;
            return prev_offset;
        }
 
        wbstate->offset += unicode_utf8len(u);
    }
 
    return wbstate->len;
}
 
#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    fold = unicode_casefold_simple(code);
    pg_wchar    iculower = u_tolower(code);
    pg_wchar    icutitle = u_totitle(code);
    pg_wchar    icuupper = u_toupper(code);
    pg_wchar    icufold = u_foldCase(code, U_FOLD_CASE_DEFAULT);
 
    if (lower != iculower || title != icutitle || upper != icuupper ||
        fold != icufold)
    {
        printf("case_test: FAILURE for codepoint 0x%06x\n", code);
        printf("case_test: Postgres lower/title/upper/fold: 0x%06x/0x%06x/0x%06x/0x%06x\n",
               lower, title, upper, fold);
        printf("case_test: ICU lower/title/upper/fold:      0x%06x/0x%06x/0x%06x/0x%06x\n",
               iculower, icutitle, icuupper, icufold);
        printf("\n");
        exit(1);
    }
}
 
static void
icu_test_full(char *str)
{
    char        lower[BUFSZ];
    char        title[BUFSZ];
    char        upper[BUFSZ];
    char        fold[BUFSZ];
    char        icu_lower[BUFSZ];
    char        icu_title[BUFSZ];
    char        icu_upper[BUFSZ];
    char        icu_fold[BUFSZ];
    UErrorCode  status;
 
    /* full case mapping doesn't use posix semantics */
    struct WordBoundaryState wbstate = {
        .str = str,
        .len = strlen(str),
        .offset = 0,
        .posix = false,
        .init = false,
        .prev_alnum = false,
    };
 
    unicode_strlower(lower, BUFSZ, str, -1, true);
    unicode_strtitle(title, BUFSZ, str, -1, true, initcap_wbnext, &wbstate);
    unicode_strupper(upper, BUFSZ, str, -1, true);
    unicode_strfold(fold, BUFSZ, str, -1, true);
    status = U_ZERO_ERROR;
    ucasemap_utf8ToLower(casemap, icu_lower, BUFSZ, str, -1, &status);
    status = U_ZERO_ERROR;
    ucasemap_utf8ToTitle(casemap, icu_title, BUFSZ, str, -1, &status);
    status = U_ZERO_ERROR;
    ucasemap_utf8ToUpper(casemap, icu_upper, BUFSZ, str, -1, &status);
    status = U_ZERO_ERROR;
    ucasemap_utf8FoldCase(casemap, icu_fold, BUFSZ, str, -1, &status);
 
    if (strcmp(lower, icu_lower) != 0)
    {
        printf("case_test: str='%s' lower='%s' icu_lower='%s'\n", str, lower,
               icu_lower);
        exit(1);
    }
    if (strcmp(title, icu_title) != 0)
    {
        printf("case_test: str='%s' title='%s' icu_title='%s'\n", str, title,
               icu_title);
        exit(1);
    }
    if (strcmp(upper, icu_upper) != 0)
    {
        printf("case_test: str='%s' upper='%s' icu_upper='%s'\n", str, upper,
               icu_upper);
        exit(1);
    }
    if (strcmp(fold, icu_fold) != 0)
    {
        printf("case_test: str='%s' fold='%s' icu_fold='%s'\n", str, fold,
               icu_fold);
        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);
            char        code_str[5] = {0};
 
            if (icu_category == PG_U_UNASSIGNED)
            {
                skipped_mismatch++;
                continue;
            }
 
            icu_test_simple(code);
            unicode_to_utf8(code, (unsigned char *) code_str);
            icu_test_full(code_str);
 
            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_convert(TestFunc tfunc, 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 = tfunc(dst1, dst1len, src1, src1len);
    if (needed != strlen(expected))
    {
        printf("case_test: convert_case test1 FAILURE: '%s' needed %zu expected %zu\n",
               test_string, needed, strlen(expected));
        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 = tfunc(dst2, dst2len, src1, src1len);
    if (needed != strlen(expected))
    {
        printf("case_test: convert_case test2 FAILURE: '%s' needed %zu expected %zu\n",
               test_string, needed, strlen(expected));
        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 = tfunc(dst1, dst1len, src2, src2len);
    if (needed != strlen(expected))
    {
        printf("case_test: convert_case test3 FAILURE: '%s' needed %zu expected %zu\n",
               test_string, 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 = tfunc(dst2, dst2len, src2, src2len);
    if (needed != strlen(expected))
    {
        printf("case_test: convert_case test4 FAILURE: '%s' needed %zu expected %zu\n",
               test_string, needed, strlen(expected));
        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 size_t
tfunc_lower(char *dst, size_t dstsize, const char *src,
            ssize_t srclen)
{
    return unicode_strlower(dst, dstsize, src, srclen, true);
}
 
static size_t
tfunc_title(char *dst, size_t dstsize, const char *src,
            ssize_t srclen)
{
    struct WordBoundaryState wbstate = {
        .str = src,
        .len = srclen,
        .offset = 0,
        .init = false,
        .prev_alnum = false,
    };
 
    return unicode_strtitle(dst, dstsize, src, srclen, true, initcap_wbnext,
                            &wbstate);
}
 
static size_t
tfunc_upper(char *dst, size_t dstsize, const char *src,
            ssize_t srclen)
{
    return unicode_strupper(dst, dstsize, src, srclen, true);
}
 
static size_t
tfunc_fold(char *dst, size_t dstsize, const char *src,
           ssize_t srclen)
{
    return unicode_strfold(dst, dstsize, src, srclen, true);
}
 
static void
test_convert_case()
{
    /* test string with no case changes */
    test_convert(tfunc_lower, "√∞", "√∞");
    /* test adjust-to-cased behavior */
    test_convert(tfunc_title, "abc 123xyz", "Abc 123xyz");
    /* test string with case changes */
    test_convert(tfunc_upper, "abc", "ABC");
    /* test string with case changes and byte length changes */
    test_convert(tfunc_lower, "ȺȺȺ", "ⱥⱥⱥ");
    /* test special case conversions */
    test_convert(tfunc_upper, "ß", "SS");
    test_convert(tfunc_lower, "ıiIİ", "ıiii\u0307");
    test_convert(tfunc_upper, "ıiIİ", "IIIİ");
    test_convert(tfunc_fold, "ıiIİ", "ıiii\u0307");
    /* test final sigma */
    test_convert(tfunc_lower, "σςΣ ΣΣΣ", "σςς σσς");
    test_convert(tfunc_lower, "σς'Σ' ΣΣ'Σ'", "σς'ς' σσ'ς'");
    test_convert(tfunc_title, "σςΣ ΣΣΣ", "Σςς Σσς");
    test_convert(tfunc_fold, "σςΣ ΣΣΣ", "σσσ σσσ");
    /* test that alphanumerics are word characters */
    test_convert(tfunc_title, "λλ", "Λλ");
    test_convert(tfunc_title, "1a", "1a");
    /* U+FF11 FULLWIDTH ONE is alphanumeric for full case mapping */
    test_convert(tfunc_title, "\uFF11a", "\uFF11a");
 
 
#ifdef USE_ICU
    icu_test_full("");
    icu_test_full("ȺȺȺ");
    icu_test_full("ßßß");
    icu_test_full("√∞");
    icu_test_full("a b");
    icu_test_full("abc 123xyz");
    icu_test_full("σςΣ ΣΣΣ");
    icu_test_full("ıiIİ");
    icu_test_full("\uFF11a");
    /* test <alpha><iota_subscript><acute> */
    icu_test_full("\u0391\u0345\u0301");
#endif
 
    printf("case_test: convert_case: success\n");
}
 
int
main(int argc, char **argv)
{
#ifdef USE_ICU
    UErrorCode  status = U_ZERO_ERROR;
 
    /*
     * Disable ICU's word break adjustment for titlecase to match the expected
     * behavior of unicode_strtitle().
     */
    casemap = ucasemap_open("und", U_TITLECASE_NO_BREAK_ADJUSTMENT, &status);
    if (U_FAILURE(status))
    {
        printf("case_test: failure opening UCaseMap: %s\n",
               u_errorName(status));
        exit(1);
    }
#endif
 
    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();
 
#ifdef USE_ICU
    ucasemap_close(casemap);
#endif
    exit(0);
}