[thirdparty/openssl.git] / crypto / o_str.c

/*
 * Copyright 2003-2024 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the Apache License 2.0 (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#include "internal/e_os.h"
#include <string.h>
#include <limits.h>
#include <openssl/crypto.h>
#include "crypto/ctype.h"
#include "internal/cryptlib.h"
#include "internal/thread_once.h"

#define DEFAULT_SEPARATOR ':'
#define CH_ZERO '\0'

char *CRYPTO_strdup(const char *str, const char* file, int line)
{
    char *ret;

    if (str == NULL)
        return NULL;
    ret = CRYPTO_malloc(strlen(str) + 1, file, line);
    if (ret != NULL)
        strcpy(ret, str);
    return ret;
}

char *CRYPTO_strndup(const char *str, size_t s, const char* file, int line)
{
    size_t maxlen;
    char *ret;

    if (str == NULL)
        return NULL;

    maxlen = OPENSSL_strnlen(str, s);

    ret = CRYPTO_malloc(maxlen + 1, file, line);
    if (ret) {
        memcpy(ret, str, maxlen);
        ret[maxlen] = CH_ZERO;
    }
    return ret;
}

void *CRYPTO_memdup(const void *data, size_t siz, const char* file, int line)
{
    void *ret;

    if (data == NULL || siz >= INT_MAX)
        return NULL;

    ret = CRYPTO_malloc(siz, file, line);
    if (ret == NULL)
        return NULL;
    return memcpy(ret, data, siz);
}

size_t OPENSSL_strnlen(const char *str, size_t maxlen)
{
    const char *p;

    for (p = str; maxlen-- != 0 && *p != CH_ZERO; ++p) ;

    return p - str;
}

size_t OPENSSL_strlcpy(char *dst, const char *src, size_t size)
{
    size_t l = 0;
    for (; size > 1 && *src; size--) {
        *dst++ = *src++;
        l++;
    }
    if (size)
        *dst = CH_ZERO;
    return l + strlen(src);
}

size_t OPENSSL_strlcat(char *dst, const char *src, size_t size)
{
    size_t l = 0;
    for (; size > 0 && *dst; size--, dst++)
        l++;
    return l + OPENSSL_strlcpy(dst, src, size);
}

int OPENSSL_hexchar2int(unsigned char c)
{
#ifdef CHARSET_EBCDIC
    c = os_toebcdic[c];
#endif

    switch (c) {
    case '0':
        return 0;
    case '1':
        return 1;
    case '2':
        return 2;
    case '3':
        return 3;
    case '4':
          return 4;
    case '5':
          return 5;
    case '6':
          return 6;
    case '7':
          return 7;
    case '8':
          return 8;
    case '9':
          return 9;
    case 'a': case 'A':
          return 0x0A;
    case 'b': case 'B':
          return 0x0B;
    case 'c': case 'C':
          return 0x0C;
    case 'd': case 'D':
          return 0x0D;
    case 'e': case 'E':
          return 0x0E;
    case 'f': case 'F':
          return 0x0F;
    }
    return -1;
}

static int hexstr2buf_sep(unsigned char *buf, size_t buf_n, size_t *buflen,
                          const char *str, const char sep)
{
    unsigned char *q;
    unsigned char ch, cl;
    int chi, cli;
    const unsigned char *p;
    size_t cnt;

    for (p = (const unsigned char *)str, q = buf, cnt = 0; *p; ) {
        ch = *p++;
        /* A separator of CH_ZERO means there is no separator */
        if (ch == sep && sep != CH_ZERO)
            continue;
        cl = *p++;
        if (!cl) {
            ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_ODD_NUMBER_OF_DIGITS);
            return 0;
        }
        cli = OPENSSL_hexchar2int(cl);
        chi = OPENSSL_hexchar2int(ch);
        if (cli < 0 || chi < 0) {
            ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_ILLEGAL_HEX_DIGIT);
            return 0;
        }
        cnt++;
        if (q != NULL) {
            if (cnt > buf_n) {
                ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_TOO_SMALL_BUFFER);
                return 0;
            }
            *q++ = (unsigned char)((chi << 4) | cli);
        }
    }

    if (buflen != NULL)
        *buflen = cnt;
    return 1;
}

/*
 * Given a string of hex digits convert to a buffer
 */
int OPENSSL_hexstr2buf_ex(unsigned char *buf, size_t buf_n, size_t *buflen,
                          const char *str, const char sep)
{
    return hexstr2buf_sep(buf, buf_n, buflen, str, sep);
}

unsigned char *ossl_hexstr2buf_sep(const char *str, long *buflen,
                                   const char sep)
{
    unsigned char *buf;
    size_t buf_n, tmp_buflen;

    buf_n = strlen(str);
    if (buf_n <= 1) {
        ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_HEX_STRING_TOO_SHORT);
        return NULL;
    }
    buf_n /= 2;
    if ((buf = OPENSSL_malloc(buf_n)) == NULL)
        return NULL;

    if (buflen != NULL)
        *buflen = 0;
    tmp_buflen = 0;
    if (hexstr2buf_sep(buf, buf_n, &tmp_buflen, str, sep)) {
        if (buflen != NULL)
            *buflen = (long)tmp_buflen;
        return buf;
    }
    OPENSSL_free(buf);
    return NULL;
}

unsigned char *OPENSSL_hexstr2buf(const char *str, long *buflen)
{
    return ossl_hexstr2buf_sep(str, buflen, DEFAULT_SEPARATOR);
}

static int buf2hexstr_sep(char *str, size_t str_n, size_t *strlength,
                          const unsigned char *buf, size_t buflen,
                          const char sep)
{
    static const char hexdig[] = "0123456789ABCDEF";
    const unsigned char *p;
    char *q;
    size_t i;
    int has_sep = (sep != CH_ZERO);
    size_t len = has_sep ? buflen * 3 : 1 + buflen * 2;

    if (strlength != NULL)
        *strlength = len;
    if (str == NULL)
        return 1;

    if (str_n < (unsigned long)len) {
        ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_TOO_SMALL_BUFFER);
        return 0;
    }

    q = str;
    for (i = 0, p = buf; i < buflen; i++, p++) {
        *q++ = hexdig[(*p >> 4) & 0xf];
        *q++ = hexdig[*p & 0xf];
        if (has_sep)
            *q++ = sep;
    }
    if (has_sep)
        --q;
    *q = CH_ZERO;

#ifdef CHARSET_EBCDIC
    ebcdic2ascii(str, str, q - str);
#endif
    return 1;
}

int OPENSSL_buf2hexstr_ex(char *str, size_t str_n, size_t *strlength,
                          const unsigned char *buf, size_t buflen,
                          const char sep)
{
    return buf2hexstr_sep(str, str_n, strlength, buf, buflen, sep);
}

char *ossl_buf2hexstr_sep(const unsigned char *buf, long buflen, char sep)
{
    char *tmp;
    size_t tmp_n;

    if (buflen == 0)
        return OPENSSL_zalloc(1);

    tmp_n = (sep != CH_ZERO) ? buflen * 3 : 1 + buflen * 2;
    if ((tmp = OPENSSL_malloc(tmp_n)) == NULL)
        return NULL;

    if (buf2hexstr_sep(tmp, tmp_n, NULL, buf, buflen, sep))
        return tmp;
    OPENSSL_free(tmp);
    return NULL;
}


/*
 * Given a buffer of length 'buflen' return a OPENSSL_malloc'ed string with
 * its hex representation @@@ (Contents of buffer are always kept in ASCII,
 * also on EBCDIC machines)
 */
char *OPENSSL_buf2hexstr(const unsigned char *buf, long buflen)
{
    return ossl_buf2hexstr_sep(buf, buflen, DEFAULT_SEPARATOR);
}

int openssl_strerror_r(int errnum, char *buf, size_t buflen)
{
#if defined(_MSC_VER) && _MSC_VER>=1400 && !defined(_WIN32_WCE)
    return !strerror_s(buf, buflen, errnum);
#elif defined(_GNU_SOURCE)
    char *err;

    /*
     * GNU strerror_r may not actually set buf.
     * It can return a pointer to some (immutable) static string in which case
     * buf is left unused.
     */
    err = strerror_r(errnum, buf, buflen);
    if (err == NULL || buflen == 0)
        return 0;
    /*
     * If err is statically allocated, err != buf and we need to copy the data.
     * If err points somewhere inside buf, OPENSSL_strlcpy can handle this,
     * since src and dest are not annotated with __restrict and the function
     * reads src byte for byte and writes to dest.
     * If err == buf we do not have to copy anything.
     */
    if (err != buf)
        OPENSSL_strlcpy(buf, err, buflen);
    return 1;
#elif (defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 200112L) || \
      (defined(_XOPEN_SOURCE) && _XOPEN_SOURCE >= 600)
    /*
     * We can use "real" strerror_r. The OpenSSL version differs in that it
     * gives 1 on success and 0 on failure for consistency with other OpenSSL
     * functions. Real strerror_r does it the other way around
     */
    return !strerror_r(errnum, buf, buflen);
#else
    char *err;

    /* Fall back to non-thread safe strerror()...its all we can do */
    if (buflen < 2)
        return 0;
    err = strerror(errnum);
    /* Can this ever happen? */
    if (err == NULL)
        return 0;
    OPENSSL_strlcpy(buf, err, buflen);
    return 1;
#endif
}

int OPENSSL_strcasecmp(const char *s1, const char *s2)
{
    int t;

    while ((t = ossl_tolower(*s1) - ossl_tolower(*s2++)) == 0)
        if (*s1++ == '\0')
            return 0;
    return t;
}

int OPENSSL_strncasecmp(const char *s1, const char *s2, size_t n)
{
    int t;
    size_t i;

    for (i = 0; i < n; i++)
        if ((t = ossl_tolower(*s1) - ossl_tolower(*s2++)) != 0)
            return t;
        else if (*s1++ == '\0')
            return 0;
    return 0;
}
Commit	Line	Data
0f113f3e	1	/*
b6461792	2	* Copyright 2003-2024 The OpenSSL Project Authors. All Rights Reserved.
e6fa67fa	3	*
0e9725bc	4	* Licensed under the Apache License 2.0 (the "License"). You may not use
62867571 RS	5	* this file except in compliance with the License. You can obtain a copy
	6	* in the file LICENSE in the source distribution or at
	7	* https://www.openssl.org/source/license.html
e6fa67fa RL	8	*/
e6fa67fa RL	9
d5f9166b	10	#include "internal/e_os.h"
71c17c36	11	#include <string.h>
07016a8a	12	#include <limits.h>
7644a9ae	13	#include <openssl/crypto.h>
fb4cdca0	14	#include "crypto/ctype.h"
7644a9ae	15	#include "internal/cryptlib.h"
f505be99	16	#include "internal/thread_once.h"
7644a9ae	17
f32af93c SL	18	#define DEFAULT_SEPARATOR ':'
	19	#define CH_ZERO '\0'
	20
037439c4 MC	21	char CRYPTO_strdup(const char str, const char* file, int line)
	22	{
	23	char *ret;
	24
	25	if (str == NULL)
	26	return NULL;
	27	ret = CRYPTO_malloc(strlen(str) + 1, file, line);
	28	if (ret != NULL)
	29	strcpy(ret, str);
	30	return ret;
	31	}
	32
	33	char CRYPTO_strndup(const char str, size_t s, const char* file, int line)
	34	{
	35	size_t maxlen;
	36	char *ret;
	37
	38	if (str == NULL)
	39	return NULL;
	40
	41	maxlen = OPENSSL_strnlen(str, s);
	42
	43	ret = CRYPTO_malloc(maxlen + 1, file, line);
	44	if (ret) {
	45	memcpy(ret, str, maxlen);
f32af93c	46	ret[maxlen] = CH_ZERO;
037439c4 MC	47	}
	48	return ret;
	49	}
	50
	51	void CRYPTO_memdup(const void data, size_t siz, const char* file, int line)
	52	{
	53	void *ret;
	54
	55	if (data == NULL \|\| siz >= INT_MAX)
	56	return NULL;
	57
	58	ret = CRYPTO_malloc(siz, file, line);
e077455e	59	if (ret == NULL)
037439c4	60	return NULL;
037439c4 MC	61	return memcpy(ret, data, siz);
	62	}
	63
7644a9ae RS	64	size_t OPENSSL_strnlen(const char *str, size_t maxlen)
	65	{
	66	const char *p;
	67
f32af93c	68	for (p = str; maxlen-- != 0 && *p != CH_ZERO; ++p) ;
7644a9ae RS	69
	70	return p - str;
	71	}
	72
	73	size_t OPENSSL_strlcpy(char dst, const char src, size_t size)
	74	{
	75	size_t l = 0;
	76	for (; size > 1 && *src; size--) {
	77	dst++ = src++;
	78	l++;
	79	}
	80	if (size)
f32af93c	81	*dst = CH_ZERO;
7644a9ae RS	82	return l + strlen(src);
	83	}
	84
	85	size_t OPENSSL_strlcat(char dst, const char src, size_t size)
	86	{
	87	size_t l = 0;
	88	for (; size > 0 && *dst; size--, dst++)
	89	l++;
	90	return l + OPENSSL_strlcpy(dst, src, size);
	91	}
14f051a0 RS	92
	93	int OPENSSL_hexchar2int(unsigned char c)
	94	{
	95	#ifdef CHARSET_EBCDIC
	96	c = os_toebcdic[c];
	97	#endif
	98
	99	switch (c) {
	100	case '0':
	101	return 0;
	102	case '1':
	103	return 1;
	104	case '2':
	105	return 2;
	106	case '3':
	107	return 3;
	108	case '4':
	109	return 4;
	110	case '5':
	111	return 5;
	112	case '6':
	113	return 6;
	114	case '7':
	115	return 7;
	116	case '8':
	117	return 8;
	118	case '9':
	119	return 9;
	120	case 'a': case 'A':
	121	return 0x0A;
	122	case 'b': case 'B':
	123	return 0x0B;
	124	case 'c': case 'C':
	125	return 0x0C;
	126	case 'd': case 'D':
	127	return 0x0D;
	128	case 'e': case 'E':
	129	return 0x0E;
	130	case 'f': case 'F':
	131	return 0x0F;
	132	}
	133	return -1;
	134	}
	135
f32af93c SL	136	static int hexstr2buf_sep(unsigned char buf, size_t buf_n, size_t buflen,
f32af93c SL	137	const char *str, const char sep)
037439c4	138	{
82bd7c2c	139	unsigned char *q;
037439c4 MC	140	unsigned char ch, cl;
	141	int chi, cli;
	142	const unsigned char *p;
82bd7c2c	143	size_t cnt;
037439c4	144
82bd7c2c	145	for (p = (const unsigned char )str, q = buf, cnt = 0; p; ) {
037439c4	146	ch = *p++;
f32af93c SL	147	/* A separator of CH_ZERO means there is no separator */
f32af93c SL	148	if (ch == sep && sep != CH_ZERO)
037439c4 MC	149	continue;
	150	cl = *p++;
	151	if (!cl) {
9311d0c4	152	ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_ODD_NUMBER_OF_DIGITS);
82bd7c2c	153	return 0;
037439c4 MC	154	}
	155	cli = OPENSSL_hexchar2int(cl);
	156	chi = OPENSSL_hexchar2int(ch);
	157	if (cli < 0 \|\| chi < 0) {
9311d0c4	158	ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_ILLEGAL_HEX_DIGIT);
82bd7c2c RL	159	return 0;
	160	}
	161	cnt++;
	162	if (q != NULL) {
	163	if (cnt > buf_n) {
9311d0c4	164	ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_TOO_SMALL_BUFFER);
82bd7c2c RL	165	return 0;
	166	}
	167	*q++ = (unsigned char)((chi << 4) \| cli);
037439c4	168	}
037439c4 MC	169	}
037439c4 MC	170
82bd7c2c RL	171	if (buflen != NULL)
	172	*buflen = cnt;
	173	return 1;
037439c4 MC	174	}
037439c4 MC	175
f32af93c SL	176	/*
	177	* Given a string of hex digits convert to a buffer
	178	*/
	179	int OPENSSL_hexstr2buf_ex(unsigned char buf, size_t buf_n, size_t buflen,
abdd3fa0	180	const char *str, const char sep)
f32af93c	181	{
abdd3fa0	182	return hexstr2buf_sep(buf, buf_n, buflen, str, sep);
f32af93c SL	183	}
f32af93c SL	184
9500c823 SL	185	unsigned char ossl_hexstr2buf_sep(const char str, long *buflen,
9500c823 SL	186	const char sep)
82bd7c2c RL	187	{
	188	unsigned char *buf;
	189	size_t buf_n, tmp_buflen;
	190
98ba251f DDO	191	buf_n = strlen(str);
	192	if (buf_n <= 1) {
	193	ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_HEX_STRING_TOO_SHORT);
	194	return NULL;
	195	}
	196	buf_n /= 2;
e077455e	197	if ((buf = OPENSSL_malloc(buf_n)) == NULL)
82bd7c2c	198	return NULL;
82bd7c2c RL	199
	200	if (buflen != NULL)
	201	*buflen = 0;
	202	tmp_buflen = 0;
f32af93c	203	if (hexstr2buf_sep(buf, buf_n, &tmp_buflen, str, sep)) {
82bd7c2c RL	204	if (buflen != NULL)
	205	*buflen = (long)tmp_buflen;
	206	return buf;
	207	}
	208	OPENSSL_free(buf);
	209	return NULL;
	210	}
	211
f32af93c SL	212	unsigned char OPENSSL_hexstr2buf(const char str, long *buflen)
f32af93c SL	213	{
9500c823	214	return ossl_hexstr2buf_sep(str, buflen, DEFAULT_SEPARATOR);
f32af93c SL	215	}
f32af93c SL	216
28e141c4	217	static int buf2hexstr_sep(char str, size_t str_n, size_t strlength,
f32af93c SL	218	const unsigned char *buf, size_t buflen,
f32af93c SL	219	const char sep)
037439c4 MC	220	{
037439c4 MC	221	static const char hexdig[] = "0123456789ABCDEF";
037439c4	222	const unsigned char *p;
82bd7c2c RL	223	char *q;
82bd7c2c RL	224	size_t i;
f32af93c SL	225	int has_sep = (sep != CH_ZERO);
f32af93c SL	226	size_t len = has_sep ? buflen * 3 : 1 + buflen * 2;
037439c4	227
28e141c4 P	228	if (strlength != NULL)
28e141c4 P	229	*strlength = len;
82bd7c2c RL	230	if (str == NULL)
82bd7c2c RL	231	return 1;
037439c4	232
f32af93c	233	if (str_n < (unsigned long)len) {
9311d0c4	234	ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_TOO_SMALL_BUFFER);
82bd7c2c	235	return 0;
037439c4	236	}
82bd7c2c RL	237
	238	q = str;
	239	for (i = 0, p = buf; i < buflen; i++, p++) {
037439c4 MC	240	q++ = hexdig[(p >> 4) & 0xf];
037439c4 MC	241	q++ = hexdig[p & 0xf];
f32af93c SL	242	if (has_sep)
f32af93c SL	243	*q++ = sep;
037439c4	244	}
f32af93c SL	245	if (has_sep)
	246	--q;
	247	*q = CH_ZERO;
	248
037439c4	249	#ifdef CHARSET_EBCDIC
c5cc9c41	250	ebcdic2ascii(str, str, q - str);
037439c4	251	#endif
82bd7c2c RL	252	return 1;
	253	}
	254
28e141c4	255	int OPENSSL_buf2hexstr_ex(char str, size_t str_n, size_t strlength,
abdd3fa0 SL	256	const unsigned char *buf, size_t buflen,
abdd3fa0 SL	257	const char sep)
f32af93c	258	{
28e141c4	259	return buf2hexstr_sep(str, str_n, strlength, buf, buflen, sep);
f32af93c SL	260	}
f32af93c SL	261
9500c823	262	char ossl_buf2hexstr_sep(const unsigned char buf, long buflen, char sep)
82bd7c2c RL	263	{
	264	char *tmp;
	265	size_t tmp_n;
	266
	267	if (buflen == 0)
	268	return OPENSSL_zalloc(1);
	269
f32af93c	270	tmp_n = (sep != CH_ZERO) ? buflen * 3 : 1 + buflen * 2;
e077455e	271	if ((tmp = OPENSSL_malloc(tmp_n)) == NULL)
82bd7c2c	272	return NULL;
037439c4	273
f32af93c	274	if (buf2hexstr_sep(tmp, tmp_n, NULL, buf, buflen, sep))
82bd7c2c RL	275	return tmp;
	276	OPENSSL_free(tmp);
	277	return NULL;
037439c4 MC	278	}
037439c4 MC	279
f32af93c SL	280
f32af93c SL	281	/*
861027ff PL	282	* Given a buffer of length 'buflen' return a OPENSSL_malloc'ed string with
	283	* its hex representation @@@ (Contents of buffer are always kept in ASCII,
	284	* also on EBCDIC machines)
f32af93c SL	285	*/
	286	char OPENSSL_buf2hexstr(const unsigned char buf, long buflen)
	287	{
861027ff	288	return ossl_buf2hexstr_sep(buf, buflen, DEFAULT_SEPARATOR);
f32af93c SL	289	}
f32af93c SL	290
7d37818d MC	291	int openssl_strerror_r(int errnum, char *buf, size_t buflen)
7d37818d MC	292	{
c35b8535	293	#if defined(_MSC_VER) && _MSC_VER>=1400 && !defined(_WIN32_WCE)
43c4116c	294	return !strerror_s(buf, buflen, errnum);
efdb2d6c	295	#elif defined(_GNU_SOURCE)
e3b35d2b VC	296	char *err;
	297
	298	/*
	299	* GNU strerror_r may not actually set buf.
	300	* It can return a pointer to some (immutable) static string in which case
	301	* buf is left unused.
	302	*/
	303	err = strerror_r(errnum, buf, buflen);
e7a4682d	304	if (err == NULL \|\| buflen == 0)
e3b35d2b VC	305	return 0;
	306	/*
	307	* If err is statically allocated, err != buf and we need to copy the data.
	308	* If err points somewhere inside buf, OPENSSL_strlcpy can handle this,
	309	* since src and dest are not annotated with __restrict and the function
	310	* reads src byte for byte and writes to dest.
	311	* If err == buf we do not have to copy anything.
	312	*/
	313	if (err != buf)
	314	OPENSSL_strlcpy(buf, err, buflen);
	315	return 1;
01b76c2c BE	316	#elif (defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 200112L) \|\| \
01b76c2c BE	317	(defined(_XOPEN_SOURCE) && _XOPEN_SOURCE >= 600)
7d37818d MC	318	/*
	319	* We can use "real" strerror_r. The OpenSSL version differs in that it
	320	* gives 1 on success and 0 on failure for consistency with other OpenSSL
	321	* functions. Real strerror_r does it the other way around
	322	*/
	323	return !strerror_r(errnum, buf, buflen);
	324	#else
	325	char *err;
e3b35d2b	326
7d37818d MC	327	/* Fall back to non-thread safe strerror()...its all we can do */
	328	if (buflen < 2)
	329	return 0;
	330	err = strerror(errnum);
	331	/* Can this ever happen? */
	332	if (err == NULL)
	333	return 0;
e3b35d2b	334	OPENSSL_strlcpy(buf, err, buflen);
7d37818d MC	335	return 1;
	336	#endif
	337	}
71c17c36	338
71c17c36 TM	339	int OPENSSL_strcasecmp(const char s1, const char s2)
71c17c36 TM	340	{
fb4cdca0	341	int t;
92d05016	342
fb4cdca0 P	343	while ((t = ossl_tolower(s1) - ossl_tolower(s2++)) == 0)
	344	if (*s1++ == '\0')
	345	return 0;
	346	return t;
71c17c36 TM	347	}
	348
	349	int OPENSSL_strncasecmp(const char s1, const char s2, size_t n)
	350	{
fb4cdca0 P	351	int t;
fb4cdca0 P	352	size_t i;
71c17c36	353
fb4cdca0 P	354	for (i = 0; i < n; i++)
	355	if ((t = ossl_tolower(s1) - ossl_tolower(s2++)) != 0)
	356	return t;
	357	else if (*s1++ == '\0')
	358	return 0;
	359	return 0;
71c17c36	360	}