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/*
 * This stuff is all stolen (with permission, since it was in the public
 * domain) from Henry Spencer's string and memory library.  Thanks Henry.
 */

/*
 * Test program for string(3) routines.
 *
 * Note that at least one Bell Labs implementation of the string
 * routines flunks a couple of these tests -- the ones which test
 * behavior on "negative" characters.
 */

#include <stdio.h>
#include <string.h>

char * index();
char * rindex();

#define STREQ(a, b) (strcmp((a), (b)) == 0)

char *it = "<UNSET>";       /* Routine name for message routines. */
int waserror = 0;       /* For exit status. */

char uctest[] = "\004\203"; /* For testing signedness of chars. */
int charsigned;         /* Result. */

/*
 - check - complain if condition is not true
 */
void
check(thing, number)
int thing;
int number;         /* Test number for error message. */
{
    if (!thing) {
        printf("%s flunked test %d\n", it, number);
        waserror = 1;
    }
}

/*
 - equal - complain if first two args don't strcmp as equal
 */
void
equal(a, b, number)
char *a;
char *b;
int number;         /* Test number for error message. */
{
    check(a != NULL && b != NULL && STREQ(a, b), number);
}

char one[50];
char two[50];

#ifdef UNIXERR
#define ERR 1
#endif
#ifdef BERKERR
#define ERR 1
#endif
#ifdef ERR
int f;
extern char *sys_errlist[];
extern int sys_nerr;
extern int errno;
#endif

/* ARGSUSED */
main(argc, argv)
int argc;
char *argv[];
{
    /*
     * First, establish whether chars are signed.
     */
    if (uctest[0] < uctest[1])
        charsigned = 0;
    else
        charsigned = 1;

    /*
     * Then, do the rest of the work.  Split into two functions because
     * some compilers get unhappy about a single immense function.
     */
    first();
    second();

    exit((waserror) ? 1 : 0);
}

first()
{
    /*
     * Test strcmp first because we use it to test other things.
     */
    it = "strcmp";
    check(strcmp("", "") == 0, 1);      /* Trivial case. */<--- Comparison of always identical static strings.
    check(strcmp("a", "a") == 0, 2);    /* Identity. */<--- Comparison of always identical static strings.
    check(strcmp("abc", "abc") == 0, 3);    /* Multicharacter. */<--- Comparison of always identical static strings.
    check(strcmp("abc", "abcd") < 0, 4);    /* Length mismatches. */<--- Unnecessary comparison of static strings.
    check(strcmp("abcd", "abc") > 0, 5);<--- Unnecessary comparison of static strings.
    check(strcmp("abcd", "abce") < 0, 6);   /* Honest miscompares. */<--- Unnecessary comparison of static strings.
    check(strcmp("abce", "abcd") > 0, 7);<--- Unnecessary comparison of static strings.
    check(strcmp("a\203", "a") > 0, 8); /* Tricky if char signed. */<--- Unnecessary comparison of static strings.
    if (charsigned)             /* Sign-bit comparison. */
        check(strcmp("a\203", "a\003") < 0, 9);<--- Comparison of always identical static strings.
    else
        check(strcmp("a\203", "a\003") > 0, 9);<--- Comparison of always identical static strings.
    check(strcmp("a", "a\203") < 0, 10);    /* Tricky if char signed. */<--- Unnecessary comparison of static strings.

    /*
     * Test strcpy next because we need it to set up other tests.
     */
    it = "strcpy";
    check(strcpy(one, "abcd") == one, 1);   /* Returned value. */
    equal(one, "abcd", 2);          /* Basic test. */

    (void) strcpy(one, "x");
    equal(one, "x", 3);         /* Writeover. */
    equal(one+2, "cd", 4);          /* Wrote too much? */

    (void) strcpy(two, "hi there");
    (void) strcpy(one, two);
    equal(one, "hi there", 5);      /* Basic test encore. */
    equal(two, "hi there", 6);      /* Stomped on source? */

    (void) strcpy(one, "");
    equal(one, "", 7);          /* Boundary condition. */

    /*
     * strcat
     */
    it = "strcat";
    (void) strcpy(one, "ijk");
    check(strcat(one, "lmn") == one, 1);    /* Returned value. */
    equal(one, "ijklmn", 2);        /* Basic test. */

    (void) strcpy(one, "x");
    (void) strcat(one, "yz");
    equal(one, "xyz", 3);           /* Writeover. */
    equal(one+4, "mn", 4);          /* Wrote too much? */

    (void) strcpy(one, "gh");
    (void) strcpy(two, "ef");
    (void) strcat(one, two);
    equal(one, "ghef", 5);          /* Basic test encore. */
    equal(two, "ef", 6);            /* Stomped on source? */

    (void) strcpy(one, "");
    (void) strcat(one, "");
    equal(one, "", 7);          /* Boundary conditions. */
    (void) strcpy(one, "ab");
    (void) strcat(one, "");
    equal(one, "ab", 8);
    (void) strcpy(one, "");
    (void) strcat(one, "cd");
    equal(one, "cd", 9);

    /*
     * strncat - first test it as strcat, with big counts, then
     * test the count mechanism.
     */
    it = "strncat";
    (void) strcpy(one, "ijk");
    check(strncat(one, "lmn", 99) == one, 1);   /* Returned value. */<--- Buffer access out-of-bounds: one
    equal(one, "ijklmn", 2);        /* Basic test. */

    (void) strcpy(one, "x");
    (void) strncat(one, "yz", 99);<--- Buffer access out-of-bounds: one
    equal(one, "xyz", 3);           /* Writeover. */
    equal(one+4, "mn", 4);          /* Wrote too much? */

    (void) strcpy(one, "gh");
    (void) strcpy(two, "ef");
    (void) strncat(one, two, 99);<--- Buffer access out-of-bounds: one<--- Dangerous usage of strncat - 3rd parameter is the maximum number of characters to append.
    equal(one, "ghef", 5);          /* Basic test encore. */
    equal(two, "ef", 6);            /* Stomped on source? */

    (void) strcpy(one, "");
    (void) strncat(one, "", 99);<--- Buffer access out-of-bounds: one
    equal(one, "", 7);          /* Boundary conditions. */
    (void) strcpy(one, "ab");
    (void) strncat(one, "", 99);<--- Buffer access out-of-bounds: one
    equal(one, "ab", 8);
    (void) strcpy(one, "");
    (void) strncat(one, "cd", 99);<--- Buffer access out-of-bounds: one
    equal(one, "cd", 9);

    (void) strcpy(one, "ab");
    (void) strncat(one, "cdef", 2);
    equal(one, "abcd", 10);         /* Count-limited. */

    (void) strncat(one, "gh", 0);
    equal(one, "abcd", 11);         /* Zero count. */

    (void) strncat(one, "gh", 2);
    equal(one, "abcdgh", 12);       /* Count and length equal. */

    /*
     * strncmp - first test as strcmp with big counts, then test
     * count code.
     */
    it = "strncmp";
    check(strncmp("", "", 99) == 0, 1); /* Trivial case. */<--- Comparison of always identical static strings.
    check(strncmp("a", "a", 99) == 0, 2);   /* Identity. */<--- Comparison of always identical static strings.
    check(strncmp("abc", "abc", 99) == 0, 3);   /* Multicharacter. */<--- Comparison of always identical static strings.
    check(strncmp("abc", "abcd", 99) < 0, 4);   /* Length unequal. */<--- Unnecessary comparison of static strings.
    check(strncmp("abcd", "abc", 99) > 0, 5);<--- Unnecessary comparison of static strings.
    check(strncmp("abcd", "abce", 99) < 0, 6);  /* Honestly unequal. */<--- Unnecessary comparison of static strings.
    check(strncmp("abce", "abcd", 99) > 0, 7);<--- Unnecessary comparison of static strings.
    check(strncmp("a\203", "a", 2) > 0, 8); /* Tricky if '\203' < 0 */<--- Unnecessary comparison of static strings.
    if (charsigned)             /* Sign-bit comparison. */
        check(strncmp("a\203", "a\003", 2) < 0, 9);<--- Comparison of always identical static strings.
    else
        check(strncmp("a\203", "a\003", 2) > 0, 9);<--- Comparison of always identical static strings.
    check(strncmp("abce", "abcd", 3) == 0, 10); /* Count limited. */<--- Unnecessary comparison of static strings.
    check(strncmp("abce", "abc", 3) == 0, 11);  /* Count == length. */<--- Unnecessary comparison of static strings.
    check(strncmp("abcd", "abce", 4) < 0, 12);  /* Nudging limit. */<--- Unnecessary comparison of static strings.
    check(strncmp("abc", "def", 0) == 0, 13);   /* Zero count. */<--- Unnecessary comparison of static strings.

    /*
     * strncpy - testing is a bit different because of odd semantics
     */
    it = "strncpy";
    check(strncpy(one, "abc", 4) == one, 1);    /* Returned value. */
    equal(one, "abc", 2);           /* Did the copy go right? */

    (void) strcpy(one, "abcdefgh");
    (void) strncpy(one, "xyz", 2);
    equal(one, "xycdefgh", 3);      /* Copy cut by count. */

    (void) strcpy(one, "abcdefgh");
    (void) strncpy(one, "xyz", 3);      /* Copy cut just before NUL. */
    equal(one, "xyzdefgh", 4);

    (void) strcpy(one, "abcdefgh");
    (void) strncpy(one, "xyz", 4);      /* Copy just includes NUL. */
    equal(one, "xyz", 5);
    equal(one+4, "efgh", 6);        /* Wrote too much? */

    (void) strcpy(one, "abcdefgh");
    (void) strncpy(one, "xyz", 5);      /* Copy includes padding. */
    equal(one, "xyz", 7);
    equal(one+4, "", 8);
    equal(one+5, "fgh", 9);

    (void) strcpy(one, "abc");
    (void) strncpy(one, "xyz", 0);      /* Zero-length copy. */
    equal(one, "abc", 10);

    (void) strncpy(one, "", 2);     /* Zero-length source. */
    equal(one, "", 11);
    equal(one+1, "", 12);
    equal(one+2, "c", 13);

    (void) strcpy(one, "hi there");
    (void) strncpy(two, one, 9);
    equal(two, "hi there", 14);     /* Just paranoia. */
    equal(one, "hi there", 15);     /* Stomped on source? */

    /*
     * strlen
     */
    it = "strlen";
    check(strlen("") == 0, 1);      /* Empty. */
    check(strlen("a") == 1, 2);     /* Single char. */
    check(strlen("abcd") == 4, 3);      /* Multiple chars. */

    /*
     * strchr
     */
    it = "strchr";
    check(strchr("abcd", 'z') == NULL, 1);  /* Not found. */
    (void) strcpy(one, "abcd");
    check(strchr(one, 'c') == one+2, 2);    /* Basic test. */
    check(strchr(one, 'd') == one+3, 3);    /* End of string. */
    check(strchr(one, 'a') == one, 4);  /* Beginning. */
    check(strchr(one, '\0') == one+4, 5);   /* Finding NUL. */
    (void) strcpy(one, "ababa");
    check(strchr(one, 'b') == one+1, 6);    /* Finding first. */
    (void) strcpy(one, "");
    check(strchr(one, 'b') == NULL, 7); /* Empty string. */
    check(strchr(one, '\0') == one, 8); /* NUL in empty string. */

    /*
     * index - just like strchr
     */
    it = "index";
    check(index("abcd", 'z') == NULL, 1);   /* Not found. */
    (void) strcpy(one, "abcd");
    check(index(one, 'c') == one+2, 2); /* Basic test. */
    check(index(one, 'd') == one+3, 3); /* End of string. */
    check(index(one, 'a') == one, 4);   /* Beginning. */
    check(index(one, '\0') == one+4, 5);    /* Finding NUL. */
    (void) strcpy(one, "ababa");
    check(index(one, 'b') == one+1, 6); /* Finding first. */
    (void) strcpy(one, "");
    check(index(one, 'b') == NULL, 7);  /* Empty string. */
    check(index(one, '\0') == one, 8);  /* NUL in empty string. */

    /*
     * strrchr
     */
    it = "strrchr";
    check(strrchr("abcd", 'z') == NULL, 1); /* Not found. */
    (void) strcpy(one, "abcd");
    check(strrchr(one, 'c') == one+2, 2);   /* Basic test. */
    check(strrchr(one, 'd') == one+3, 3);   /* End of string. */
    check(strrchr(one, 'a') == one, 4); /* Beginning. */
    check(strrchr(one, '\0') == one+4, 5);  /* Finding NUL. */
    (void) strcpy(one, "ababa");
    check(strrchr(one, 'b') == one+3, 6);   /* Finding last. */
    (void) strcpy(one, "");
    check(strrchr(one, 'b') == NULL, 7);    /* Empty string. */
    check(strrchr(one, '\0') == one, 8);    /* NUL in empty string. */

    /*
     * rindex - just like strrchr
     */
    it = "rindex";
    check(rindex("abcd", 'z') == NULL, 1);  /* Not found. */
    (void) strcpy(one, "abcd");
    check(rindex(one, 'c') == one+2, 2);    /* Basic test. */
    check(rindex(one, 'd') == one+3, 3);    /* End of string. */
    check(rindex(one, 'a') == one, 4);  /* Beginning. */
    check(rindex(one, '\0') == one+4, 5);   /* Finding NUL. */
    (void) strcpy(one, "ababa");
    check(rindex(one, 'b') == one+3, 6);    /* Finding last. */
    (void) strcpy(one, "");
    check(rindex(one, 'b') == NULL, 7); /* Empty string. */
    check(rindex(one, '\0') == one, 8); /* NUL in empty string. */
}

second()
{
    /*
     * strpbrk - somewhat like strchr
     */
    it = "strpbrk";
    check(strpbrk("abcd", "z") == NULL, 1); /* Not found. */
    (void) strcpy(one, "abcd");
    check(strpbrk(one, "c") == one+2, 2);   /* Basic test. */
    check(strpbrk(one, "d") == one+3, 3);   /* End of string. */
    check(strpbrk(one, "a") == one, 4); /* Beginning. */
    check(strpbrk(one, "") == NULL, 5); /* Empty search list. */
    check(strpbrk(one, "cb") == one+1, 6);  /* Multiple search. */
    (void) strcpy(one, "abcabdea");
    check(strpbrk(one, "b") == one+1, 7);   /* Finding first. */
    check(strpbrk(one, "cb") == one+1, 8);  /* With multiple search. */
    check(strpbrk(one, "db") == one+1, 9);  /* Another variant. */
    (void) strcpy(one, "");
    check(strpbrk(one, "bc") == NULL, 10);  /* Empty string. */
    check(strpbrk(one, "") == NULL, 11);    /* Both strings empty. */

    /*
     * strspn
     */
    it = "strspn";
    check(strspn("abcba", "abc") == 5, 1);  /* Whole string. */
    check(strspn("abcba", "ab") == 2, 2);   /* Partial. */
    check(strspn("abc", "qx") == 0, 3); /* None. */
    check(strspn("", "ab") == 0, 4);    /* Null string. */
    check(strspn("abc", "") == 0, 5);   /* Null search list. */

    /*
     * strcspn
     */
    it = "strcspn";
    check(strcspn("abcba", "qx") == 5, 1);  /* Whole string. */
    check(strcspn("abcba", "cx") == 2, 2);  /* Partial. */
    check(strcspn("abc", "abc") == 0, 3);   /* None. */
    check(strcspn("", "ab") == 0, 4);   /* Null string. */
    check(strcspn("abc", "") == 3, 5);  /* Null search list. */

    /*
     * strtok - the hard one
     */
    it = "strtok";
    (void) strcpy(one, "first, second, third");
    equal(strtok(one, ", "), "first", 1);   /* Basic test. */
    equal(one, "first", 2);
    equal(strtok((char *)NULL, ", "), "second", 3);
    equal(strtok((char *)NULL, ", "), "third", 4);
    check(strtok((char *)NULL, ", ") == NULL, 5);
    (void) strcpy(one, ", first, ");
    equal(strtok(one, ", "), "first", 6);   /* Extra delims, 1 tok. */
    check(strtok((char *)NULL, ", ") == NULL, 7);
    (void) strcpy(one, "1a, 1b; 2a, 2b");
    equal(strtok(one, ", "), "1a", 8);  /* Changing delim lists. */
    equal(strtok((char *)NULL, "; "), "1b", 9);
    equal(strtok((char *)NULL, ", "), "2a", 10);
    (void) strcpy(two, "x-y");
    equal(strtok(two, "-"), "x", 11);   /* New string before done. */
    equal(strtok((char *)NULL, "-"), "y", 12);
    check(strtok((char *)NULL, "-") == NULL, 13);
    (void) strcpy(one, "a,b, c,, ,d");
    equal(strtok(one, ", "), "a", 14);  /* Different separators. */
    equal(strtok((char *)NULL, ", "), "b", 15);
    equal(strtok((char *)NULL, " ,"), "c", 16); /* Permute list too. */
    equal(strtok((char *)NULL, " ,"), "d", 17);
    check(strtok((char *)NULL, ", ") == NULL, 18);
    check(strtok((char *)NULL, ", ") == NULL, 19);  /* Persistence. */
    (void) strcpy(one, ", ");
    check(strtok(one, ", ") == NULL, 20);   /* No tokens. */
    (void) strcpy(one, "");
    check(strtok(one, ", ") == NULL, 21);   /* Empty string. */
    (void) strcpy(one, "abc");
    equal(strtok(one, ", "), "abc", 22);    /* No delimiters. */
    check(strtok((char *)NULL, ", ") == NULL, 23);
    (void) strcpy(one, "abc");
    equal(strtok(one, ""), "abc", 24);  /* Empty delimiter list. */
    check(strtok((char *)NULL, "") == NULL, 25);
    (void) strcpy(one, "abcdefgh");
    (void) strcpy(one, "a,b,c");
    equal(strtok(one, ","), "a", 26);   /* Basics again... */
    equal(strtok((char *)NULL, ","), "b", 27);
    equal(strtok((char *)NULL, ","), "c", 28);
    check(strtok((char *)NULL, ",") == NULL, 29);
    equal(one+6, "gh", 30);         /* Stomped past end? */
    equal(one, "a", 31);            /* Stomped old tokens? */
    equal(one+2, "b", 32);
    equal(one+4, "c", 33);

    /*
     * memcmp
     */
    it = "memcmp";
    check(memcmp("a", "a", 1) == 0, 1); /* Identity. */
    check(memcmp("abc", "abc", 3) == 0, 2); /* Multicharacter. */
    check(memcmp("abcd", "abce", 4) < 0, 3);    /* Honestly unequal. */
    check(memcmp("abce", "abcd", 4) > 0, 4);
    check(memcmp("alph", "beta", 4) < 0, 5);
    if (charsigned)             /* Sign-bit comparison. */
        check(memcmp("a\203", "a\003", 2) < 0, 6);
    else
        check(memcmp("a\203", "a\003", 2) > 0, 6);
    check(memcmp("abce", "abcd", 3) == 0, 7);   /* Count limited. */
    check(memcmp("abc", "def", 0) == 0, 8); /* Zero count. */

    /*
     * memchr
     */
    it = "memchr";
    check(memchr("abcd", 'z', 4) == NULL, 1);   /* Not found. */
    (void) strcpy(one, "abcd");
    check(memchr(one, 'c', 4) == one+2, 2); /* Basic test. */
    check(memchr(one, 'd', 4) == one+3, 3); /* End of string. */
    check(memchr(one, 'a', 4) == one, 4);   /* Beginning. */
    check(memchr(one, '\0', 5) == one+4, 5);    /* Finding NUL. */
    (void) strcpy(one, "ababa");
    check(memchr(one, 'b', 5) == one+1, 6); /* Finding first. */
    check(memchr(one, 'b', 0) == NULL, 7);  /* Zero count. */
    check(memchr(one, 'a', 1) == one, 8);   /* Singleton case. */
    (void) strcpy(one, "a\203b");
    check(memchr(one, 0203, 3) == one+1, 9);    /* Unsignedness. */

    /*
     * memcpy
     *
     * Note that X3J11 says memcpy must work regardless of overlap.
     * The SVID says it might fail.
     */
    it = "memcpy";
    check(memcpy(one, "abc", 4) == one, 1); /* Returned value. */
    equal(one, "abc", 2);           /* Did the copy go right? */

    (void) strcpy(one, "abcdefgh");
    (void) memcpy(one+1, "xyz", 2);
    equal(one, "axydefgh", 3);      /* Basic test. */

    (void) strcpy(one, "abc");
    (void) memcpy(one, "xyz", 0);
    equal(one, "abc", 4);           /* Zero-length copy. */

    (void) strcpy(one, "hi there");
    (void) strcpy(two, "foo");
    (void) memcpy(two, one, 9);
    equal(two, "hi there", 5);      /* Just paranoia. */
    equal(one, "hi there", 6);      /* Stomped on source? */

    (void) strcpy(one, "abcdefgh");
    (void) memcpy(one+1, one, 9);
    equal(one, "aabcdefgh", 7);     /* Overlap, right-to-left. */

    (void) strcpy(one, "abcdefgh");
    (void) memcpy(one+1, one+2, 7);
    equal(one, "acdefgh", 8);       /* Overlap, left-to-right. */

    (void) strcpy(one, "abcdefgh");
    (void) memcpy(one, one, 9);
    equal(one, "abcdefgh", 9);      /* 100% overlap. */

    /*
     * memccpy - first test like memcpy, then the search part
     *
     * The SVID, the only place where memccpy is mentioned, says
     * overlap might fail, so we don't try it.  Besides, it's hard
     * to see the rationale for a non-left-to-right memccpy.
     */
    it = "memccpy";
    check(memccpy(one, "abc", 'q', 4) == NULL, 1);  /* Returned value. */
    equal(one, "abc", 2);           /* Did the copy go right? */

    (void) strcpy(one, "abcdefgh");
    (void) memccpy(one+1, "xyz", 'q', 2);
    equal(one, "axydefgh", 3);      /* Basic test. */

    (void) strcpy(one, "abc");
    (void) memccpy(one, "xyz", 'q', 0);
    equal(one, "abc", 4);           /* Zero-length copy. */

    (void) strcpy(one, "hi there");
    (void) strcpy(two, "foo");
    (void) memccpy(two, one, 'q', 9);
    equal(two, "hi there", 5);      /* Just paranoia. */
    equal(one, "hi there", 6);      /* Stomped on source? */

    (void) strcpy(one, "abcdefgh");
    (void) strcpy(two, "horsefeathers");
    check(memccpy(two, one, 'f', 9) == two+6, 7);   /* Returned value. */
    equal(one, "abcdefgh", 8);      /* Source intact? */
    equal(two, "abcdefeathers", 9);     /* Copy correct? */

    (void) strcpy(one, "abcd");
    (void) strcpy(two, "bumblebee");
    check(memccpy(two, one, 'a', 4) == two+1, 10);  /* First char. */
    equal(two, "aumblebee", 11);
    check(memccpy(two, one, 'd', 4) == two+4, 12);  /* Last char. */
    equal(two, "abcdlebee", 13);
    (void) strcpy(one, "xyz");
    check(memccpy(two, one, 'x', 1) == two+1, 14);  /* Singleton. */
    equal(two, "xbcdlebee", 15);

    /*
     * memset
     */
    it = "memset";
    (void) strcpy(one, "abcdefgh");
    check(memset(one+1, 'x', 3) == one+1, 1);   /* Return value. */
    equal(one, "axxxefgh", 2);      /* Basic test. */

    (void) memset(one+2, 'y', 0);<--- memset() called to fill 0 bytes of 'one'
    equal(one, "axxxefgh", 3);      /* Zero-length set. */

    (void) memset(one+5, 0, 1);
    equal(one, "axxxe", 4);         /* Zero fill. */
    equal(one+6, "gh", 5);          /* And the leftover. */

    (void) memset(one+2, 010045, 1);
    equal(one, "ax\045xe", 6);      /* Unsigned char convert. */

    /*
     * bcopy - much like memcpy
     *
     * Berklix manual is silent about overlap, so don't test it.
     */
    it = "bcopy";
    (void) bcopy("abc", one, 4);
    equal(one, "abc", 1);           /* Simple copy. */

    (void) strcpy(one, "abcdefgh");
    (void) bcopy("xyz", one+1, 2);
    equal(one, "axydefgh", 2);      /* Basic test. */

    (void) strcpy(one, "abc");
    (void) bcopy("xyz", one, 0);
    equal(one, "abc", 3);           /* Zero-length copy. */

    (void) strcpy(one, "hi there");
    (void) strcpy(two, "foo");
    (void) bcopy(one, two, 9);
    equal(two, "hi there", 4);      /* Just paranoia. */
    equal(one, "hi there", 5);      /* Stomped on source? */

    /*
     * bzero
     */
    it = "bzero";
    (void) strcpy(one, "abcdef");
    bzero(one+2, 2);
    equal(one, "ab", 1);            /* Basic test. */
    equal(one+3, "", 2);
    equal(one+4, "ef", 3);

    (void) strcpy(one, "abcdef");
    bzero(one+2, 0);
    equal(one, "abcdef", 4);        /* Zero-length copy. */

    /*
     * bcmp - somewhat like memcmp
     */
    it = "bcmp";
    check(bcmp("a", "a", 1) == 0, 1);   /* Identity. */
    check(bcmp("abc", "abc", 3) == 0, 2);   /* Multicharacter. */
    check(bcmp("abcd", "abce", 4) != 0, 3); /* Honestly unequal. */
    check(bcmp("abce", "abcd", 4) != 0, 4);
    check(bcmp("alph", "beta", 4) != 0, 5);
    check(bcmp("abce", "abcd", 3) == 0, 6); /* Count limited. */
    check(bcmp("abc", "def", 0) == 0, 8);   /* Zero count. */

#ifdef ERR
    /*
     * strerror - VERY system-dependent
     */
    it = "strerror";
    f = open("/", 1);   /* Should always fail. */
    check(f < 0 && errno > 0 && errno < sys_nerr, 1);
    equal(strerror(errno), sys_errlist[errno], 2);
#ifdef UNIXERR
    equal(strerror(errno), "Is a directory", 3);
#endif
#ifdef BERKERR
    equal(strerror(errno), "Permission denied", 3);
#endif
#endif
}