b_print.c

开源的ssl算法openssl,版本0.9.8H

    }
    *truncated = (currlen > *maxlen - 1);
    if (*truncated)
        currlen = *maxlen - 1;
    doapr_outch(sbuffer, buffer, &currlen, maxlen, '\0');
    *retlen = currlen - 1;
    return;
}

static void
fmtstr(
    char **sbuffer,
    char **buffer,
    size_t *currlen,
    size_t *maxlen,
    const char *value,
    int flags,
    int min,
    int max)
{
    int padlen, strln;
    int cnt = 0;

    if (value == 0)
        value = "<NULL>";
    for (strln = 0; value[strln]; ++strln)
        ;
    padlen = min - strln;
    if (padlen < 0)
        padlen = 0;
    if (flags & DP_F_MINUS)
        padlen = -padlen;

    while ((padlen > 0) && (cnt < max)) {
        doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
        --padlen;
        ++cnt;
    }
    while (*value && (cnt < max)) {
        doapr_outch(sbuffer, buffer, currlen, maxlen, *value++);
        ++cnt;
    }
    while ((padlen < 0) && (cnt < max)) {
        doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
        ++padlen;
        ++cnt;
    }
}

static void
fmtint(
    char **sbuffer,
    char **buffer,
    size_t *currlen,
    size_t *maxlen,
    LLONG value,
    int base,
    int min,
    int max,
    int flags)
{
    int signvalue = 0;
    const char *prefix = "";
    unsigned LLONG uvalue;
    char convert[DECIMAL_SIZE(value)+3];
    int place = 0;
    int spadlen = 0;
    int zpadlen = 0;
    int caps = 0;

    if (max < 0)
        max = 0;
    uvalue = value;
    if (!(flags & DP_F_UNSIGNED)) {
        if (value < 0) {
            signvalue = '-';
            uvalue = -value;
        } else if (flags & DP_F_PLUS)
            signvalue = '+';
        else if (flags & DP_F_SPACE)
            signvalue = ' ';
    }
    if (flags & DP_F_NUM) {
	if (base == 8) prefix = "0";
	if (base == 16) prefix = "0x";
    }
    if (flags & DP_F_UP)
        caps = 1;
    do {
        convert[place++] =
            (caps ? "0123456789ABCDEF" : "0123456789abcdef")
            [uvalue % (unsigned) base];
        uvalue = (uvalue / (unsigned) base);
    } while (uvalue && (place < (int)sizeof(convert)));
    if (place == sizeof(convert))
        place--;
    convert[place] = 0;

    zpadlen = max - place;
    spadlen = min - OSSL_MAX(max, place) - (signvalue ? 1 : 0) - strlen(prefix);
    if (zpadlen < 0)
        zpadlen = 0;
    if (spadlen < 0)
        spadlen = 0;
    if (flags & DP_F_ZERO) {
        zpadlen = OSSL_MAX(zpadlen, spadlen);
        spadlen = 0;
    }
    if (flags & DP_F_MINUS)
        spadlen = -spadlen;

    /* spaces */
    while (spadlen > 0) {
        doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
        --spadlen;
    }

    /* sign */
    if (signvalue)
        doapr_outch(sbuffer, buffer, currlen, maxlen, signvalue);

    /* prefix */
    while (*prefix) {
	doapr_outch(sbuffer, buffer, currlen, maxlen, *prefix);
	prefix++;
    }

    /* zeros */
    if (zpadlen > 0) {
        while (zpadlen > 0) {
            doapr_outch(sbuffer, buffer, currlen, maxlen, '0');
            --zpadlen;
        }
    }
    /* digits */
    while (place > 0)
        doapr_outch(sbuffer, buffer, currlen, maxlen, convert[--place]);

    /* left justified spaces */
    while (spadlen < 0) {
        doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
        ++spadlen;
    }
    return;
}

static LDOUBLE
abs_val(LDOUBLE value)
{
    LDOUBLE result = value;
    if (value < 0)
        result = -value;
    return result;
}

static LDOUBLE
pow_10(int in_exp)
{
    LDOUBLE result = 1;
    while (in_exp) {
        result *= 10;
        in_exp--;
    }
    return result;
}

static long
roundv(LDOUBLE value)
{
    long intpart;
    intpart = (long) value;
    value = value - intpart;
    if (value >= 0.5)
        intpart++;
    return intpart;
}

static void
fmtfp(
    char **sbuffer,
    char **buffer,
    size_t *currlen,
    size_t *maxlen,
    LDOUBLE fvalue,
    int min,
    int max,
    int flags)
{
    int signvalue = 0;
    LDOUBLE ufvalue;
    char iconvert[20];
    char fconvert[20];
    int iplace = 0;
    int fplace = 0;
    int padlen = 0;
    int zpadlen = 0;
    int caps = 0;
    long intpart;
    long fracpart;
    long max10;

    if (max < 0)
        max = 6;
    ufvalue = abs_val(fvalue);
    if (fvalue < 0)
        signvalue = '-';
    else if (flags & DP_F_PLUS)
        signvalue = '+';
    else if (flags & DP_F_SPACE)
        signvalue = ' ';

    intpart = (long)ufvalue;

    /* sorry, we only support 9 digits past the decimal because of our
       conversion method */
    if (max > 9)
        max = 9;

    /* we "cheat" by converting the fractional part to integer by
       multiplying by a factor of 10 */
    max10 = roundv(pow_10(max));
    fracpart = roundv(pow_10(max) * (ufvalue - intpart));

    if (fracpart >= max10) {
        intpart++;
        fracpart -= max10;
    }

    /* convert integer part */
    do {
        iconvert[iplace++] =
            (caps ? "0123456789ABCDEF"
              : "0123456789abcdef")[intpart % 10];
        intpart = (intpart / 10);
    } while (intpart && (iplace < (int)sizeof(iconvert)));
    if (iplace == sizeof iconvert)
        iplace--;
    iconvert[iplace] = 0;

    /* convert fractional part */
    do {
        fconvert[fplace++] =
            (caps ? "0123456789ABCDEF"
              : "0123456789abcdef")[fracpart % 10];
        fracpart = (fracpart / 10);
    } while (fplace < max);
    if (fplace == sizeof fconvert)
        fplace--;
    fconvert[fplace] = 0;

    /* -1 for decimal point, another -1 if we are printing a sign */
    padlen = min - iplace - max - 1 - ((signvalue) ? 1 : 0);
    zpadlen = max - fplace;
    if (zpadlen < 0)
        zpadlen = 0;
    if (padlen < 0)
        padlen = 0;
    if (flags & DP_F_MINUS)
        padlen = -padlen;

    if ((flags & DP_F_ZERO) && (padlen > 0)) {
        if (signvalue) {
            doapr_outch(sbuffer, buffer, currlen, maxlen, signvalue);
            --padlen;
            signvalue = 0;
        }
        while (padlen > 0) {
            doapr_outch(sbuffer, buffer, currlen, maxlen, '0');
            --padlen;
        }
    }
    while (padlen > 0) {
        doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
        --padlen;
    }
    if (signvalue)
        doapr_outch(sbuffer, buffer, currlen, maxlen, signvalue);

    while (iplace > 0)
        doapr_outch(sbuffer, buffer, currlen, maxlen, iconvert[--iplace]);

    /*
     * Decimal point. This should probably use locale to find the correct
     * char to print out.
     */
    if (max > 0 || (flags & DP_F_NUM)) {
        doapr_outch(sbuffer, buffer, currlen, maxlen, '.');

        while (fplace > 0)
            doapr_outch(sbuffer, buffer, currlen, maxlen, fconvert[--fplace]);
    }
    while (zpadlen > 0) {
        doapr_outch(sbuffer, buffer, currlen, maxlen, '0');
        --zpadlen;
    }

    while (padlen < 0) {
        doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
        ++padlen;
    }
}

static void
doapr_outch(
    char **sbuffer,
    char **buffer,
    size_t *currlen,
    size_t *maxlen,
    int c)
{
    /* If we haven't at least one buffer, someone has doe a big booboo */
    assert(*sbuffer != NULL || buffer != NULL);

    if (buffer) {
	while (*currlen >= *maxlen) {
	    if (*buffer == NULL) {
		if (*maxlen == 0)
		    *maxlen = 1024;
		*buffer = OPENSSL_malloc(*maxlen);
		if (*currlen > 0) {
		    assert(*sbuffer != NULL);
		    memcpy(*buffer, *sbuffer, *currlen);
		}
		*sbuffer = NULL;
	    } else {
		*maxlen += 1024;
		*buffer = OPENSSL_realloc(*buffer, *maxlen);
	    }
	}
	/* What to do if *buffer is NULL? */
	assert(*sbuffer != NULL || *buffer != NULL);
    }

    if (*currlen < *maxlen) {
	if (*sbuffer)
	    (*sbuffer)[(*currlen)++] = (char)c;
	else
	    (*buffer)[(*currlen)++] = (char)c;
    }

    return;
}

/***************************************************************************/

int BIO_printf (BIO *bio, const char *format, ...)
	{
	va_list args;
	int ret;

	va_start(args, format);

	ret = BIO_vprintf(bio, format, args);

	va_end(args);
	return(ret);
	}

int BIO_vprintf (BIO *bio, const char *format, va_list args)
	{
	int ret;
	size_t retlen;
	char hugebuf[1024*2];	/* Was previously 10k, which is unreasonable
				   in small-stack environments, like threads
				   or DOS programs. */
	char *hugebufp = hugebuf;
	size_t hugebufsize = sizeof(hugebuf);
	char *dynbuf = NULL;
	int ignored;

	dynbuf = NULL;
	CRYPTO_push_info("doapr()");
	_dopr(&hugebufp, &dynbuf, &hugebufsize,
		&retlen, &ignored, format, args);
	if (dynbuf)
		{
		ret=BIO_write(bio, dynbuf, (int)retlen);
		OPENSSL_free(dynbuf);
		}
	else
		{
		ret=BIO_write(bio, hugebuf, (int)retlen);
		}
	CRYPTO_pop_info();
	return(ret);
	}

/* As snprintf is not available everywhere, we provide our own implementation.
 * This function has nothing to do with BIOs, but it's closely related
 * to BIO_printf, and we need *some* name prefix ...
 * (XXX  the function should be renamed, but to what?) */
int BIO_snprintf(char *buf, size_t n, const char *format, ...)
	{
	va_list args;
	int ret;

	va_start(args, format);

	ret = BIO_vsnprintf(buf, n, format, args);

	va_end(args);
	return(ret);
	}

int BIO_vsnprintf(char *buf, size_t n, const char *format, va_list args)
	{
	size_t retlen;
	int truncated;

	_dopr(&buf, NULL, &n, &retlen, &truncated, format, args);

	if (truncated)
		/* In case of truncation, return -1 like traditional snprintf.
		 * (Current drafts for ISO/IEC 9899 say snprintf should return
		 * the number of characters that would have been written,
		 * had the buffer been large enough.) */
		return -1;
	else
		return (retlen <= INT_MAX) ? (int)retlen : -1;
	}