tests/test_string.cpp

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "cx/string.h"
#include "util_allocator.h"

#include <gtest/gtest.h>

#define EXPECT_ZERO_TERMINATED(str) EXPECT_EQ((str).ptr[(str).length], '\0')

TEST(String, construct) {
    cxstring s1 = cx_str("1234");
    cxstring s2 = cx_strn("abcd", 2);
    cxmutstr s3 = cx_mutstr((char *) "1234");
    cxmutstr s4 = cx_mutstrn((char *) "abcd", 2);

    EXPECT_EQ(s1.length, 4);
    EXPECT_EQ(s2.length, 2);
    EXPECT_EQ(s3.length, 4);
    EXPECT_EQ(s4.length, 2);
}

TEST(String, strfree) {
    CxTestingAllocator alloc;
    auto test = (char *) cxMalloc(&alloc, 16);
    cxmutstr str = cx_mutstrn(test, 16);
    ASSERT_EQ(str.ptr, test);
    EXPECT_EQ(str.length, 16);
    cx_strfree_a(&alloc, &str);
    EXPECT_EQ(str.ptr, nullptr);
    EXPECT_EQ(str.length, 0);
    EXPECT_TRUE(alloc.verify());
}

TEST(String, strdup) {
    cxstring str = CX_STR("test");
    cxmutstr dup = cx_strdup(str);
    ASSERT_EQ(dup.length, str.length);
    EXPECT_STREQ(dup.ptr, str.ptr);
    EXPECT_ZERO_TERMINATED(dup);
    cx_strfree(&dup);

    str.length = 2;
    dup = cx_strdup(str);
    ASSERT_EQ(dup.length, str.length);
    EXPECT_STREQ(dup.ptr, "te");
    EXPECT_ZERO_TERMINATED(dup);
    cx_strfree(&dup);
}

TEST(String, strlen) {
    cxstring s1 = CX_STR("1234");
    cxstring s2 = CX_STR(".:.:.");
    cxstring s3 = CX_STR("X");

    size_t len0 = cx_strlen(0);
    size_t len1 = cx_strlen(1, s1);
    size_t len2 = cx_strlen(2, s1, s2);
    size_t len3 = cx_strlen(3, s1, s2, s3);

    EXPECT_EQ(len0, 0);
    EXPECT_EQ(len1, 4);
    EXPECT_EQ(len2, 9);
    EXPECT_EQ(len3, 10);
}

TEST(String, strsubs) {
    cxstring str = CX_STR("A test string");

    cxstring sub = cx_strsubs(str, 0);
    EXPECT_EQ(cx_strcmp(sub, str), 0);

    sub = cx_strsubs(str, 2);
    EXPECT_EQ(cx_strcmp(sub, cx_str("test string")), 0);

    sub = cx_strsubs(str, 7);
    EXPECT_EQ(cx_strcmp(sub, cx_str("string")), 0);

    sub = cx_strsubs(str, 15);
    EXPECT_EQ(cx_strcmp(sub, cx_str("")), 0);

    sub = cx_strsubsl(str, 2, 4);
    EXPECT_EQ(cx_strcmp(sub, cx_str("test")), 0);

    sub = cx_strsubsl(str, 7, 3);
    EXPECT_EQ(cx_strcmp(sub, cx_str("str")), 0);

    sub = cx_strsubsl(str, 7, 20);
    EXPECT_EQ(cx_strcmp(sub, cx_str("string")), 0);

    // just for coverage, call the _m variant
    auto m = cx_strsubs_m(cx_mutstrn(nullptr, 0), 0);
    EXPECT_EQ(cx_strcmp(cx_strcast(m), cx_str("")), 0);
}

TEST(String, strchr) {
    cxstring str = CX_STR("I will find you - and I will kill you");

    cxstring notfound = cx_strchr(str, 'x');
    EXPECT_EQ(notfound.length, 0);

    cxstring result = cx_strchr(str, 'w');
    EXPECT_EQ(result.length, 35);
    EXPECT_STREQ(result.ptr, "will find you - and I will kill you");

    // just for coverage, call the _m variant
    auto m = cx_strchr_m(cx_mutstrn(nullptr, 0), 'a');
    EXPECT_EQ(cx_strcmp(cx_strcast(m), cx_str("")), 0);
}

TEST(String, strrchr) {
    cxstring str = CX_STR("I will find you - and I will kill you");

    cxstring notfound = cx_strrchr(str, 'x');
    EXPECT_EQ(notfound.length, 0);

    cxstring result = cx_strrchr(str, 'w');
    EXPECT_EQ(result.length, 13);
    EXPECT_STREQ(result.ptr, "will kill you");

    // just for coverage, call the _m variant
    auto m = cx_strrchr_m(cx_mutstrn(nullptr, 0), 'a');
    EXPECT_EQ(cx_strcmp(cx_strcast(m), cx_str("")), 0);
}

TEST(String, strstr) {
    cxstring str = CX_STR("find the match in this string");
    cxstring longstr = CX_STR(
            "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkl"
            "mnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwx"
            "yzabcdeababababnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghij"
            "klmnopqrstuvwxyzaababababababababrstuvwxyzabcdefghijklmnopqrstuv"
            "abababababababababababababababababababababababababababababababab"
            "abababababababababababababababababababababababababababababababab"
            "abababababababababababababababababababababababababababababababab"
            "abababababababababababababababababababababababababababababababab"
            "abababababababababababababababababababababababababababababababab"
            "abababababababababababababababababababababababababababababababab"
            "wxyz1234567890");
    cxstring longstrpattern = CX_STR(
            "abababababababababababababababababababababababababababababababab"
            "abababababababababababababababababababababababababababababababab"
            "abababababababababababababababababababababababababababababababab"
            "abababababababababababababababababababababababababababababababab"
            "abababababababababababababababababababababababababababababababab"
    );
    cxstring longstrresult = CX_STR(
            "abababababababababababababababababababababababababababababababab"
            "abababababababababababababababababababababababababababababababab"
            "abababababababababababababababababababababababababababababababab"
            "abababababababababababababababababababababababababababababababab"
            "abababababababababababababababababababababababababababababababab"
            "abababababababababababababababababababababababababababababababab"
            "wxyz1234567890"
    );

    cxstring notfound = cx_strstr(str, cx_str("no match"));
    EXPECT_EQ(notfound.length, 0);

    cxstring result = cx_strstr(str, cx_str("match"));
    EXPECT_EQ(result.length, 20);
    EXPECT_STREQ(result.ptr, "match in this string");

    result = cx_strstr(str, cx_str(""));
    EXPECT_EQ(result.length, str.length);
    EXPECT_STREQ(result.ptr, str.ptr);

    result = cx_strstr(longstr, longstrpattern);
    EXPECT_EQ(result.length, longstrresult.length);
    EXPECT_STREQ(result.ptr, longstrresult.ptr);

    // just for coverage, call the _m variant
    auto mstr = cx_strdup(longstr);
    auto m = cx_strstr_m(mstr, longstrpattern);
    EXPECT_EQ(m.length, longstrresult.length);
    EXPECT_STREQ(m.ptr, longstrresult.ptr);
    cx_strfree(&mstr);
}

TEST(String, strcmp) {
    cxstring str = CX_STR("compare this");

    EXPECT_EQ(cx_strcmp(cx_str(""), cx_str("")), 0);
    EXPECT_GT(cx_strcmp(str, cx_str("")), 0);
    EXPECT_EQ(cx_strcmp(str, cx_str("compare this")), 0);
    EXPECT_NE(cx_strcmp(str, cx_str("Compare This")), 0);
    EXPECT_LT(cx_strcmp(str, cx_str("compare tool")), 0);
    EXPECT_GT(cx_strcmp(str, cx_str("compare shit")), 0);
    EXPECT_LT(cx_strcmp(str, cx_str("compare this not")), 0);
    EXPECT_GT(cx_strcmp(str, cx_str("compare")), 0);

    cxstring str2 = cx_str("Compare This");
    EXPECT_NE(cx_strcmp_p(&str, &str2), 0);
    str2 = cx_str("compare this");
    EXPECT_EQ(cx_strcmp_p(&str, &str2), 0);
}

TEST(String, strcasecmp) {
    cxstring str = CX_STR("compare this");

    EXPECT_EQ(cx_strcasecmp(cx_str(""), cx_str("")), 0);
    EXPECT_GT(cx_strcasecmp(str, cx_str("")), 0);
    EXPECT_EQ(cx_strcasecmp(str, cx_str("compare this")), 0);
    EXPECT_EQ(cx_strcasecmp(str, cx_str("Compare This")), 0);
    EXPECT_LT(cx_strcasecmp(str, cx_str("compare tool")), 0);
    EXPECT_GT(cx_strcasecmp(str, cx_str("compare shit")), 0);
    EXPECT_LT(cx_strcasecmp(str, cx_str("compare this not")), 0);
    EXPECT_GT(cx_strcasecmp(str, cx_str("compare")), 0);

    cxstring str2 = cx_str("Compare This");
    EXPECT_EQ(cx_strcasecmp_p(&str, &str2), 0);
    str2 = cx_str("Compare Tool");
    EXPECT_LT(cx_strcasecmp_p(&str, &str2), 0);
}

TEST(String, strcat) {
    cxstring s1 = CX_STR("12");
    cxstring s2 = CX_STR("34");
    cxstring s3 = CX_STR("56");
    cxstring sn = {nullptr, 0};

    CxTestingAllocator alloc;

    cxmutstr t1 = cx_strcat_a(&alloc, 2, s1, s2);
    EXPECT_EQ(cx_strcmp(cx_strcast(t1), cx_str("1234")), 0);
    EXPECT_ZERO_TERMINATED(t1);
    cx_strfree_a(&alloc, &t1);

    cxmutstr t2 = cx_strcat_a(&alloc, 3, s1, s2, s3);
    EXPECT_EQ(cx_strcmp(cx_strcast(t2), cx_str("123456")), 0);
    EXPECT_ZERO_TERMINATED(t2);
    cx_strfree_a(&alloc, &t2);

    cxmutstr t3 = cx_strcat_a(&alloc, 6, s1, sn, s2, sn, s3, sn);
    EXPECT_EQ(cx_strcmp(cx_strcast(t3), cx_str("123456")), 0);
    EXPECT_ZERO_TERMINATED(t3);
    cx_strfree_a(&alloc, &t3);

    cxmutstr t4 = cx_strcat_a(&alloc, 2, sn, sn);
    EXPECT_EQ(cx_strcmp(cx_strcast(t4), cx_str("")), 0);
    EXPECT_ZERO_TERMINATED(t4);
    cx_strfree_a(&alloc, &t4);

    EXPECT_TRUE(alloc.verify());

    // use the macro
    cxmutstr t5 = cx_strcat(3, s3, s1, s2);
    EXPECT_EQ(cx_strcmp(cx_strcast(t5), cx_str("561234")), 0);
    EXPECT_ZERO_TERMINATED(t5);
    cx_strfree(&t5);
}

TEST(String, strsplit) {

    cxstring test = cx_str("this,is,a,csv,string");
    size_t capa = 8;
    cxstring list[8];
    size_t n;

    // special case: empty string
    n = cx_strsplit(test, cx_str(""), capa, list);
    ASSERT_EQ(n, 1);
    EXPECT_EQ(cx_strcmp(list[0], test), 0);

    // no delimiter occurrence
    n = cx_strsplit(test, cx_str("z"), capa, list);
    ASSERT_EQ(n, 1);
    EXPECT_EQ(cx_strcmp(list[0], test), 0);

    // partially matching delimiter
    n = cx_strsplit(test, cx_str("is,not"), capa, list);
    ASSERT_EQ(n, 1);
    EXPECT_EQ(cx_strcmp(list[0], test), 0);

    // matching single-char delimiter
    n = cx_strsplit(test, cx_str(","), capa, list);
    ASSERT_EQ(n, 5);
    EXPECT_EQ(cx_strcmp(list[0], cx_str("this")), 0);
    EXPECT_EQ(cx_strcmp(list[1], cx_str("is")), 0);
    EXPECT_EQ(cx_strcmp(list[2], cx_str("a")), 0);
    EXPECT_EQ(cx_strcmp(list[3], cx_str("csv")), 0);
    EXPECT_EQ(cx_strcmp(list[4], cx_str("string")), 0);

    // matching multi-char delimiter
    n = cx_strsplit(test, cx_str("is"), capa, list);
    ASSERT_EQ(n, 3);
    EXPECT_EQ(cx_strcmp(list[0], cx_str("th")), 0);
    EXPECT_EQ(cx_strcmp(list[1], cx_str(",")), 0);
    EXPECT_EQ(cx_strcmp(list[2], cx_str(",a,csv,string")), 0);

    // bounded list using single-char delimiter
    n = cx_strsplit(test, cx_str(","), 3, list);
    ASSERT_EQ(n, 3);
    EXPECT_EQ(cx_strcmp(list[0], cx_str("this")), 0);
    EXPECT_EQ(cx_strcmp(list[1], cx_str("is")), 0);
    EXPECT_EQ(cx_strcmp(list[2], cx_str("a,csv,string")), 0);

    // bounded list using multi-char delimiter
    n = cx_strsplit(test, cx_str("is"), 2, list);
    ASSERT_EQ(n, 2);
    EXPECT_EQ(cx_strcmp(list[0], cx_str("th")), 0);
    EXPECT_EQ(cx_strcmp(list[1], cx_str(",is,a,csv,string")), 0);

    // start with delimiter
    n = cx_strsplit(test, cx_str("this"), capa, list);
    ASSERT_EQ(n, 2);
    EXPECT_EQ(cx_strcmp(list[0], cx_str("")), 0);
    EXPECT_EQ(cx_strcmp(list[1], cx_str(",is,a,csv,string")), 0);

    // end with delimiter
    n = cx_strsplit(test, cx_str("string"), capa, list);
    ASSERT_EQ(n, 2);
    EXPECT_EQ(cx_strcmp(list[0], cx_str("this,is,a,csv,")), 0);
    EXPECT_EQ(cx_strcmp(list[1], cx_str("")), 0);


    // end with delimiter exceed bound
    n = cx_strsplit(cx_str("a,b,c,"), cx_str(","), 3, list);
    ASSERT_EQ(n, 3);
    EXPECT_EQ(cx_strcmp(list[0], cx_str("a")), 0);
    EXPECT_EQ(cx_strcmp(list[1], cx_str("b")), 0);
    EXPECT_EQ(cx_strcmp(list[2], cx_str("c,")), 0);

    // exact match
    n = cx_strsplit(test, cx_str("this,is,a,csv,string"), capa, list);
    ASSERT_EQ(n, 2);
    EXPECT_EQ(cx_strcmp(list[0], cx_str("")), 0);
    EXPECT_EQ(cx_strcmp(list[1], cx_str("")), 0);

    // string to be split is only substring
    n = cx_strsplit(test, cx_str("this,is,a,csv,string,with,extension"), capa, list);
    ASSERT_EQ(n, 1);
    EXPECT_EQ(cx_strcmp(list[0], test), 0);

    // subsequent encounter of delimiter (the string between is empty)
    n = cx_strsplit(test, cx_str("is,"), capa, list);
    ASSERT_EQ(n, 3);
    EXPECT_EQ(cx_strcmp(list[0], cx_str("th")), 0);
    EXPECT_EQ(cx_strcmp(list[1], cx_str("")), 0);
    EXPECT_EQ(cx_strcmp(list[2], cx_str("a,csv,string")), 0);

    // call the _m variant just for coverage
    auto mtest = cx_strdup(test);
    cxmutstr mlist[4];
    n = cx_strsplit_m(mtest, cx_str("is,"), 4, mlist);
    ASSERT_EQ(n, 3);
    EXPECT_EQ(cx_strcmp(cx_strcast(mlist[0]), cx_str("th")), 0);
    EXPECT_EQ(cx_strcmp(cx_strcast(mlist[1]), cx_str("")), 0);
    EXPECT_EQ(cx_strcmp(cx_strcast(mlist[2]), cx_str("a,csv,string")), 0);
    cx_strfree(&mtest);
}

TEST(String, strsplit_a) {
    CxTestingAllocator alloc;

    cxstring test = cx_str("this,is,a,csv,string");
    size_t capa = 8;
    cxstring *list;
    size_t n;

    // special case: empty string
    n = cx_strsplit_a(&alloc, test, cx_str(""), capa, &list);
    ASSERT_EQ(n, 1);
    EXPECT_EQ(cx_strcmp(list[0], test), 0);
    cxFree(&alloc, list);

    // no delimiter occurrence
    n = cx_strsplit_a(&alloc, test, cx_str("z"), capa, &list);
    ASSERT_EQ(n, 1);
    EXPECT_EQ(cx_strcmp(list[0], test), 0);
    cxFree(&alloc, list);

    // partially matching delimiter
    n = cx_strsplit_a(&alloc, test, cx_str("is,not"), capa, &list);
    ASSERT_EQ(n, 1);
    EXPECT_EQ(cx_strcmp(list[0], test), 0);
    cxFree(&alloc, list);

    // matching single-char delimiter
    n = cx_strsplit_a(&alloc, test, cx_str(","), capa, &list);
    ASSERT_EQ(n, 5);
    EXPECT_EQ(cx_strcmp(list[0], cx_str("this")), 0);
    EXPECT_EQ(cx_strcmp(list[1], cx_str("is")), 0);
    EXPECT_EQ(cx_strcmp(list[2], cx_str("a")), 0);
    EXPECT_EQ(cx_strcmp(list[3], cx_str("csv")), 0);
    EXPECT_EQ(cx_strcmp(list[4], cx_str("string")), 0);
    cxFree(&alloc, list);

    // matching multi-char delimiter
    n = cx_strsplit_a(&alloc, test, cx_str("is"), capa, &list);
    ASSERT_EQ(n, 3);
    EXPECT_EQ(cx_strcmp(list[0], cx_str("th")), 0);
    EXPECT_EQ(cx_strcmp(list[1], cx_str(",")), 0);
    EXPECT_EQ(cx_strcmp(list[2], cx_str(",a,csv,string")), 0);
    cxFree(&alloc, list);

    // bounded list using single-char delimiter
    n = cx_strsplit_a(&alloc, test, cx_str(","), 3, &list);
    ASSERT_EQ(n, 3);
    EXPECT_EQ(cx_strcmp(list[0], cx_str("this")), 0);
    EXPECT_EQ(cx_strcmp(list[1], cx_str("is")), 0);
    EXPECT_EQ(cx_strcmp(list[2], cx_str("a,csv,string")), 0);
    cxFree(&alloc, list);

    // bounded list using multi-char delimiter
    n = cx_strsplit_a(&alloc, test, cx_str("is"), 2, &list);
    ASSERT_EQ(n, 2);
    EXPECT_EQ(cx_strcmp(list[0], cx_str("th")), 0);
    EXPECT_EQ(cx_strcmp(list[1], cx_str(",is,a,csv,string")), 0);
    cxFree(&alloc, list);

    // start with delimiter
    n = cx_strsplit_a(&alloc, test, cx_str("this"), capa, &list);
    ASSERT_EQ(n, 2);
    EXPECT_EQ(cx_strcmp(list[0], cx_str("")), 0);
    EXPECT_EQ(cx_strcmp(list[1], cx_str(",is,a,csv,string")), 0);
    cxFree(&alloc, list);

    // end with delimiter
    n = cx_strsplit_a(&alloc, test, cx_str("string"), capa, &list);
    ASSERT_EQ(n, 2);
    EXPECT_EQ(cx_strcmp(list[0], cx_str("this,is,a,csv,")), 0);
    EXPECT_EQ(cx_strcmp(list[1], cx_str("")), 0);
    cxFree(&alloc, list);

    // end with delimiter exceed bound
    n = cx_strsplit_a(&alloc, cx_str("a,b,c,"), cx_str(","), 3, &list);
    ASSERT_EQ(n, 3);
    EXPECT_EQ(cx_strcmp(list[0], cx_str("a")), 0);
    EXPECT_EQ(cx_strcmp(list[1], cx_str("b")), 0);
    EXPECT_EQ(cx_strcmp(list[2], cx_str("c,")), 0);
    cxFree(&alloc, list);

    // exact match
    n = cx_strsplit_a(&alloc, test, cx_str("this,is,a,csv,string"), capa, &list);
    ASSERT_EQ(n, 2);
    EXPECT_EQ(cx_strcmp(list[0], cx_str("")), 0);
    EXPECT_EQ(cx_strcmp(list[1], cx_str("")), 0);
    cxFree(&alloc, list);

    // string to be split is only substring
    n = cx_strsplit_a(&alloc, test, cx_str("this,is,a,csv,string,with,extension"), capa, &list);
    ASSERT_EQ(n, 1);
    EXPECT_EQ(cx_strcmp(list[0], test), 0);
    cxFree(&alloc, list);

    // subsequent encounter of delimiter (the string between is empty)
    n = cx_strsplit_a(&alloc, test, cx_str("is,"), capa, &list);
    ASSERT_EQ(n, 3);
    EXPECT_EQ(cx_strcmp(list[0], cx_str("th")), 0);
    EXPECT_EQ(cx_strcmp(list[1], cx_str("")), 0);
    EXPECT_EQ(cx_strcmp(list[2], cx_str("a,csv,string")), 0);
    cxFree(&alloc, list);

    // call the _m variant just for coverage
    auto mtest = cx_strdup(test);
    cxmutstr *mlist;
    n = cx_strsplit_ma(&alloc, mtest, cx_str("is,"), 4, &mlist);
    ASSERT_EQ(n, 3);
    EXPECT_EQ(cx_strcmp(cx_strcast(mlist[0]), cx_str("th")), 0);
    EXPECT_EQ(cx_strcmp(cx_strcast(mlist[1]), cx_str("")), 0);
    EXPECT_EQ(cx_strcmp(cx_strcast(mlist[2]), cx_str("a,csv,string")), 0);
    cxFree(&alloc, mlist);
    cx_strfree(&mtest);

    EXPECT_TRUE(alloc.verify());
}

TEST(String, strtrim) {
    cxstring t1 = cx_strtrim(cx_str("  ein test  \t "));
    cxstring t2 = cx_strtrim(cx_str("abc"));
    cxstring t3 = cx_strtrim(cx_str(" 123"));
    cxstring t4 = cx_strtrim(cx_str("xyz "));
    cxstring t5 = cx_strtrim(cx_str("   "));
    cxstring empty = cx_strtrim(cx_str(""));

    EXPECT_EQ(cx_strcmp(t1, cx_str("ein test")), 0);
    EXPECT_EQ(cx_strcmp(t2, cx_str("abc")), 0);
    EXPECT_EQ(cx_strcmp(t3, cx_str("123")), 0);
    EXPECT_EQ(cx_strcmp(t4, cx_str("xyz")), 0);
    EXPECT_EQ(cx_strcmp(t5, cx_str("")), 0);
    EXPECT_EQ(cx_strcmp(empty, cx_str("")), 0);

    // call the _m variant just for coverage
    cxmutstr m1 = cx_strtrim_m(cx_mutstr((char *) "  ein test  \t "));
    EXPECT_EQ(cx_strcmp(cx_strcast(m1), cx_str("ein test")), 0);
}

TEST(String, strprefix) {
    cxstring str = CX_STR("test my prefix and my suffix");
    cxstring empty = CX_STR("");
    EXPECT_FALSE(cx_strprefix(empty, cx_str("pref")));
    EXPECT_TRUE(cx_strprefix(str, empty));
    EXPECT_TRUE(cx_strprefix(empty, empty));
    EXPECT_TRUE(cx_strprefix(str, cx_str("test ")));
    EXPECT_FALSE(cx_strprefix(str, cx_str("8-) fsck ")));
}

TEST(String, strsuffix) {
    cxstring str = CX_STR("test my prefix and my suffix");
    cxstring empty = CX_STR("");
    EXPECT_FALSE(cx_strsuffix(empty, cx_str("suf")));
    EXPECT_TRUE(cx_strsuffix(str, empty));
    EXPECT_TRUE(cx_strsuffix(empty, empty));
    EXPECT_TRUE(cx_strsuffix(str, cx_str("fix")));
    EXPECT_FALSE(cx_strsuffix(str, cx_str("fox")));
}

TEST(String, strcaseprefix) {
    cxstring str = CX_STR("test my prefix and my suffix");
    cxstring empty = CX_STR("");
    EXPECT_FALSE(cx_strcaseprefix(empty, cx_str("pREf")));
    EXPECT_TRUE(cx_strcaseprefix(str, empty));
    EXPECT_TRUE(cx_strcaseprefix(empty, empty));
    EXPECT_TRUE(cx_strcaseprefix(str, cx_str("TEST ")));
    EXPECT_FALSE(cx_strcaseprefix(str, cx_str("8-) fsck ")));
}

TEST(String, strcasesuffix) {
    cxstring str = CX_STR("test my prefix and my suffix");
    cxstring empty = CX_STR("");
    EXPECT_FALSE(cx_strcasesuffix(empty, cx_str("sUf")));
    EXPECT_TRUE(cx_strcasesuffix(str, empty));
    EXPECT_TRUE(cx_strcasesuffix(empty, empty));
    EXPECT_TRUE(cx_strcasesuffix(str, cx_str("FIX")));
    EXPECT_FALSE(cx_strcasesuffix(str, cx_str("fox")));
}

TEST(String, strreplace) {
    CxTestingAllocator alloc;
    cxstring str = CX_STR("test ababab string aba");
    cxstring longstr = CX_STR(
            "xyaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaacd");
    cxstring notrail = CX_STR("test abab");
    cxstring empty = CX_STR("");
    cxstring astr = CX_STR("aaaaaaaaaa");
    cxstring csstr = CX_STR("test AB ab TEST xyz");

    cxmutstr repl = cx_strreplace(str, cx_str("abab"), cx_str("muchlonger"));
    auto expected = "test muchlongerab string aba";

    cxmutstr repln = cx_strreplacen(str, cx_str("ab"), cx_str("c"), 2);
    auto expectedn = "test ccab string aba";

    cxmutstr longrepl = cx_strreplace(longstr, cx_str("a"), cx_str("z"));
    auto longexpect = "xyzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzcd";

    cxmutstr replnotrail = cx_strreplace(notrail, cx_str("ab"), cx_str("z"));
    auto notrailexpect = "test zz";

    cxmutstr repleq = cx_strreplace(str, str, cx_str("hello"));
    auto eqexpect = "hello";

    cxmutstr replempty1 = cx_strreplace(empty, cx_str("ab"), cx_str("c")); // expect: empty
    cxmutstr replempty2 = cx_strreplace(str, cx_str("abab"), empty);
    auto emptyexpect2 = "test ab string aba";

    cxmutstr replpre = cx_strreplace(str, cx_str("test "), cx_str("TEST "));
    auto preexpected = "TEST ababab string aba";

    cxmutstr replan1 = cx_strreplacen(astr, cx_str("a"), cx_str("x"), 1);
    auto an1expected = "xaaaaaaaaa";

    cxmutstr replan4 = cx_strreplacen(astr, cx_str("a"), cx_str("x"), 4);
    auto an4expected = "xxxxaaaaaa";

    cxmutstr replan9 = cx_strreplacen(astr, cx_str("a"), cx_str("x"), 9);
    auto an9expected = "xxxxxxxxxa";

    cxmutstr replan10 = cx_strreplacen(astr, cx_str("a"), cx_str("x"), 10);
    auto an10expected = "xxxxxxxxxx";

    cxmutstr repl1_a = cx_strreplace_a(&alloc, csstr, cx_str("AB"), cx_str("*"));
    auto expeced1_a = "test * ab TEST xyz";

    cxmutstr repl2_a = cx_strreplace_a(&alloc, csstr, cx_str("test"), cx_str("TEST"));
    auto expected2_a = "TEST AB ab TEST xyz";


    EXPECT_NE(repl.ptr, str.ptr);
    EXPECT_ZERO_TERMINATED(repl);
    EXPECT_STREQ(repl.ptr, expected);
    EXPECT_ZERO_TERMINATED(repln);
    EXPECT_STREQ(repln.ptr, expectedn);
    EXPECT_ZERO_TERMINATED(longrepl);
    EXPECT_STREQ(longrepl.ptr, longexpect);
    EXPECT_ZERO_TERMINATED(replnotrail);
    EXPECT_STREQ(replnotrail.ptr, notrailexpect);
    EXPECT_ZERO_TERMINATED(repleq);
    EXPECT_STREQ(repleq.ptr, eqexpect);
    EXPECT_ZERO_TERMINATED(replempty1);
    EXPECT_STREQ(replempty1.ptr, "");
    EXPECT_ZERO_TERMINATED(replempty2);
    EXPECT_STREQ(replempty2.ptr, emptyexpect2);
    EXPECT_ZERO_TERMINATED(replpre);
    EXPECT_STREQ(replpre.ptr, preexpected);
    EXPECT_ZERO_TERMINATED(replan1);
    EXPECT_STREQ(replan1.ptr, an1expected);
    EXPECT_ZERO_TERMINATED(replan4);
    EXPECT_STREQ(replan4.ptr, an4expected);
    EXPECT_ZERO_TERMINATED(replan9);
    EXPECT_STREQ(replan9.ptr, an9expected);
    EXPECT_ZERO_TERMINATED(replan10);
    EXPECT_STREQ(replan10.ptr, an10expected);
    EXPECT_ZERO_TERMINATED(repl1_a);
    EXPECT_STREQ(repl1_a.ptr, expeced1_a);
    EXPECT_ZERO_TERMINATED(repl2_a);
    EXPECT_STREQ(repl2_a.ptr, expected2_a);

    cx_strfree(&repl);
    cx_strfree(&repln);
    cx_strfree(&longrepl);
    cx_strfree(&replnotrail);
    cx_strfree(&repleq);
    cx_strfree(&replempty1);
    cx_strfree(&replempty2);
    cx_strfree(&replpre);
    cx_strfree(&replan1);
    cx_strfree(&replan4);
    cx_strfree(&replan9);
    cx_strfree(&replan10);

    cx_strfree_a(&alloc, &repl1_a);
    cx_strfree_a(&alloc, &repl2_a);
    EXPECT_TRUE(alloc.verify());
}

TEST(String, strupper) {
    cxmutstr str = cx_strdup(cx_str("thIs 1s @ Te$t"));
    cx_strupper(str);
    EXPECT_STREQ(str.ptr, "THIS 1S @ TE$T");
    cx_strfree(&str);
}

TEST(String, strlower) {
    cxmutstr str = cx_strdup(cx_str("thIs 1s @ Te$t"));
    cx_strlower(str);
    EXPECT_STREQ(str.ptr, "this 1s @ te$t");
    cx_strfree(&str);
}

TEST(String, strtok) {
    cxstring str = cx_str("a,comma,separated,string");
    cxstring delim = cx_str(",");
    CxStrtokCtx ctx = cx_strtok(str, delim, 3);
    EXPECT_EQ(ctx.str.ptr, str.ptr);
    EXPECT_EQ(ctx.str.length, str.length);
    EXPECT_EQ(ctx.delim.ptr, delim.ptr);
    EXPECT_EQ(ctx.delim.length, delim.length);
    EXPECT_EQ(ctx.limit, 3);
    EXPECT_EQ(ctx.found, 0);
    EXPECT_EQ(ctx.pos, 0);
    EXPECT_EQ(ctx.next_pos, 0);
    EXPECT_EQ(ctx.delim_more, nullptr);
    EXPECT_EQ(ctx.delim_more_count, 0);
}

TEST(String, strtok_m) {
    cxmutstr str = cx_strdup(cx_str("a,comma,separated,string"));
    cxstring delim = cx_str(",");
    CxStrtokCtx ctx = cx_strtok_m(str, delim, 3);
    EXPECT_EQ(ctx.str.ptr, str.ptr);
    EXPECT_EQ(ctx.str.length, str.length);
    EXPECT_EQ(ctx.delim.ptr, delim.ptr);
    EXPECT_EQ(ctx.delim.length, delim.length);
    EXPECT_EQ(ctx.limit, 3);
    EXPECT_EQ(ctx.found, 0);
    EXPECT_EQ(ctx.pos, 0);
    EXPECT_EQ(ctx.next_pos, 0);
    EXPECT_EQ(ctx.delim_more, nullptr);
    EXPECT_EQ(ctx.delim_more_count, 0);
    cx_strfree(&str);
}

TEST(String, strtok_delim) {
    cxstring str = cx_str("an,arbitrarily|separated;string");
    cxstring delim = cx_str(",");
    cxstring delim_more[2] = {CX_STR("|"), CX_STR(";")};
    CxStrtokCtx ctx = cx_strtok(str, delim, 3);
    cx_strtok_delim(&ctx, delim_more, 2);
    EXPECT_EQ(ctx.str.ptr, str.ptr);
    EXPECT_EQ(ctx.str.length, str.length);
    EXPECT_EQ(ctx.delim.ptr, delim.ptr);
    EXPECT_EQ(ctx.delim.length, delim.length);
    EXPECT_EQ(ctx.limit, 3);
    EXPECT_EQ(ctx.found, 0);
    EXPECT_EQ(ctx.pos, 0);
    EXPECT_EQ(ctx.next_pos, 0);
    EXPECT_EQ(ctx.delim_more, delim_more);
    EXPECT_EQ(ctx.delim_more_count, 2);
}

TEST(String, strtok_next_easy) {
    cxstring str = cx_str("a,comma,separated,string");
    cxstring delim = cx_str(",");
    CxStrtokCtx ctx = cx_strtok(str, delim, 3);
    bool ret;
    cxstring tok;

    ret = cx_strtok_next(&ctx, &tok);
    ASSERT_TRUE(ret);
    EXPECT_EQ(cx_strcmp(tok, cx_str("a")), 0);
    EXPECT_EQ(ctx.pos, 0);
    EXPECT_EQ(ctx.next_pos, 2);
    EXPECT_EQ(ctx.delim_pos, 1);
    EXPECT_EQ(ctx.found, 1);

    ret = cx_strtok_next(&ctx, &tok);
    ASSERT_TRUE(ret);
    EXPECT_EQ(cx_strcmp(tok, cx_str("comma")), 0);
    EXPECT_EQ(ctx.pos, 2);
    EXPECT_EQ(ctx.next_pos, 8);
    EXPECT_EQ(ctx.delim_pos, 7);
    EXPECT_EQ(ctx.found, 2);

    ret = cx_strtok_next(&ctx, &tok);
    ASSERT_TRUE(ret);
    EXPECT_EQ(cx_strcmp(tok, cx_str("separated")), 0);
    EXPECT_EQ(ctx.pos, 8);
    EXPECT_EQ(ctx.next_pos, 18);
    EXPECT_EQ(ctx.delim_pos, 17);
    EXPECT_EQ(ctx.found, 3);

    ret = cx_strtok_next(&ctx, &tok);
    ASSERT_FALSE(ret);
    EXPECT_EQ(ctx.pos, 8);
    EXPECT_EQ(ctx.next_pos, 18);
    EXPECT_EQ(ctx.delim_pos, 17);
    EXPECT_EQ(ctx.found, 3);
}

TEST(String, strtok_next_unlimited) {
    cxstring str = cx_str("some;-;otherwise;-;separated;-;string;-;");
    cxstring delim = cx_str(";-;");
    CxStrtokCtx ctx = cx_strtok(str, delim, SIZE_MAX);
    bool ret;
    cxstring tok;

    ret = cx_strtok_next(&ctx, &tok);
    ASSERT_TRUE(ret);
    EXPECT_EQ(cx_strcmp(tok, cx_str("some")), 0);
    EXPECT_EQ(ctx.pos, 0);
    EXPECT_EQ(ctx.next_pos, 7);
    EXPECT_EQ(ctx.delim_pos, 4);
    EXPECT_EQ(ctx.found, 1);

    ret = cx_strtok_next(&ctx, &tok);
    ASSERT_TRUE(ret);
    EXPECT_EQ(cx_strcmp(tok, cx_str("otherwise")), 0);
    EXPECT_EQ(ctx.pos, 7);
    EXPECT_EQ(ctx.next_pos, 19);
    EXPECT_EQ(ctx.delim_pos, 16);
    EXPECT_EQ(ctx.found, 2);

    ret = cx_strtok_next(&ctx, &tok);
    ASSERT_TRUE(ret);
    EXPECT_EQ(cx_strcmp(tok, cx_str("separated")), 0);
    EXPECT_EQ(ctx.pos, 19);
    EXPECT_EQ(ctx.next_pos, 31);
    EXPECT_EQ(ctx.delim_pos, 28);
    EXPECT_EQ(ctx.found, 3);

    ret = cx_strtok_next(&ctx, &tok);
    ASSERT_TRUE(ret);
    EXPECT_EQ(cx_strcmp(tok, cx_str("string")), 0);
    EXPECT_EQ(ctx.pos, 31);
    EXPECT_EQ(ctx.next_pos, 40);
    EXPECT_EQ(ctx.delim_pos, 37);
    EXPECT_EQ(ctx.found, 4);

    ret = cx_strtok_next(&ctx, &tok);
    ASSERT_TRUE(ret);
    EXPECT_EQ(cx_strcmp(tok, cx_str("")), 0);
    EXPECT_EQ(ctx.pos, 40);
    EXPECT_EQ(ctx.next_pos, 40);
    EXPECT_EQ(ctx.delim_pos, 40);
    EXPECT_EQ(ctx.found, 5);

    ret = cx_strtok_next(&ctx, &tok);
    ASSERT_FALSE(ret);
    EXPECT_EQ(ctx.pos, 40);
    EXPECT_EQ(ctx.delim_pos, 40);
    EXPECT_EQ(ctx.found, 5);
}

TEST(String, strtok_next_advanced) {
    cxmutstr str = cx_strdup(cx_str("an,arbitrarily;||separated;string"));
    cxstring delim = cx_str(",");
    cxstring delim_more[2] = {CX_STR("||"), CX_STR(";")};
    CxStrtokCtx ctx = cx_strtok_m(str, delim, 10);
    cx_strtok_delim(&ctx, delim_more, 2);
    bool ret;
    cxmutstr tok;

    ret = cx_strtok_next_m(&ctx, &tok);
    ASSERT_TRUE(ret);
    EXPECT_EQ(cx_strcmp(cx_strcast(tok), cx_str("an")), 0);
    EXPECT_EQ(ctx.pos, 0);
    EXPECT_EQ(ctx.next_pos, 3);
    EXPECT_EQ(ctx.delim_pos, 2);
    EXPECT_EQ(ctx.found, 1);
    cx_strupper(tok);

    ret = cx_strtok_next_m(&ctx, &tok);
    ASSERT_TRUE(ret);
    EXPECT_EQ(cx_strcmp(cx_strcast(tok), cx_str("arbitrarily")), 0);
    EXPECT_EQ(ctx.pos, 3);
    EXPECT_EQ(ctx.next_pos, 15);
    EXPECT_EQ(ctx.delim_pos, 14);
    EXPECT_EQ(ctx.found, 2);
    cx_strupper(tok);

    ret = cx_strtok_next_m(&ctx, &tok);
    ASSERT_TRUE(ret);
    EXPECT_EQ(cx_strcmp(cx_strcast(tok), cx_str("")), 0);
    EXPECT_EQ(ctx.pos, 15);
    EXPECT_EQ(ctx.next_pos, 17);
    EXPECT_EQ(ctx.delim_pos, 15);
    EXPECT_EQ(ctx.found, 3);
    cx_strupper(tok);

    ret = cx_strtok_next_m(&ctx, &tok);
    ASSERT_TRUE(ret);
    EXPECT_EQ(cx_strcmp(cx_strcast(tok), cx_str("separated")), 0);
    EXPECT_EQ(ctx.pos, 17);
    EXPECT_EQ(ctx.next_pos, 27);
    EXPECT_EQ(ctx.delim_pos, 26);
    EXPECT_EQ(ctx.found, 4);
    cx_strupper(tok);

    ret = cx_strtok_next_m(&ctx, &tok);
    ASSERT_TRUE(ret);
    EXPECT_EQ(cx_strcmp(cx_strcast(tok), cx_str("string")), 0);
    EXPECT_EQ(ctx.pos, 27);
    EXPECT_EQ(ctx.next_pos, 33);
    EXPECT_EQ(ctx.delim_pos, 33);
    EXPECT_EQ(ctx.found, 5);
    cx_strupper(tok);

    ret = cx_strtok_next_m(&ctx, &tok);
    ASSERT_FALSE(ret);
    EXPECT_EQ(ctx.pos, 27);
    EXPECT_EQ(ctx.next_pos, 33);
    EXPECT_EQ(ctx.delim_pos, 33);
    EXPECT_EQ(ctx.found, 5);

    EXPECT_EQ(cx_strcmp(cx_strcast(str), cx_str("AN,ARBITRARILY;||SEPARATED;STRING")), 0);

    cx_strfree(&str);
}