snprintf.c

snmp up 2

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

/*
 * Have to handle DP_F_NUM (ie 0x and 0 alternates) 
 */

static void
fmtint(char *buffer, size_t * currlen, size_t maxlen,
       long value, int base, int min, int max, int flags)
{
    int             signvalue = 0;
    unsigned long   uvalue;
    char            convert[20];
    int             place = 0;
    int             spadlen = 0;        /* amount to space pad */
    int             zpadlen = 0;        /* amount to zero pad */
    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)   /* Do a sign (+/i) */
            signvalue = '+';
        else if (flags & DP_F_SPACE)
            signvalue = ' ';
    }

    if (flags & DP_F_UP)
        caps = 1;               /* Should characters be upper case? */

    do {
        convert[place++] = (caps ? "0123456789ABCDEF" : "0123456789abcdef")
            [uvalue % (unsigned) base];
        uvalue = (uvalue / (unsigned) base);
    } while (uvalue && (place < 20));
    if (place == 20)
        place--;
    convert[place] = 0;

    zpadlen = max - place;
    spadlen = min - MAX(max, place) - (signvalue ? 1 : 0);
    if (zpadlen < 0)
        zpadlen = 0;
    if (spadlen < 0)
        spadlen = 0;
    if (flags & DP_F_ZERO) {
        zpadlen = MAX(zpadlen, spadlen);
        spadlen = 0;
    }
    if (flags & DP_F_MINUS)
        spadlen = -spadlen;     /* Left Justifty */

#ifdef DEBUG_SNPRINTF
    dprint(1,
           (debugfile, "zpad: %d, spad: %d, min: %d, max: %d, place: %d\n",
            zpadlen, spadlen, min, max, place));
#endif

    /*
     * Spaces 
     */
    while (spadlen > 0) {
        dopr_outch(buffer, currlen, maxlen, ' ');
        --spadlen;
    }

    /*
     * Sign 
     */
    if (signvalue)
        dopr_outch(buffer, currlen, maxlen, signvalue);

    /*
     * Zeros 
     */
    if (zpadlen > 0) {
        while (zpadlen > 0) {
            dopr_outch(buffer, currlen, maxlen, '0');
            --zpadlen;
        }
    }

    /*
     * Digits 
     */
    while (place > 0)
        dopr_outch(buffer, currlen, maxlen, convert[--place]);

    /*
     * Left Justified spaces 
     */
    while (spadlen < 0) {
        dopr_outch(buffer, currlen, maxlen, ' ');
        ++spadlen;
    }
}

static          LDOUBLE
abs_val(LDOUBLE value)
{
    LDOUBLE         result = value;

    if (value < 0)
        result = -value;

    return result;
}

static          LDOUBLE
pow10(int exp)
{
    LDOUBLE         result = 1;

    while (exp) {
        result *= 10;
        exp--;
    }

    return result;
}

static long
round(LDOUBLE value)
{
    long            intpart;

    intpart = value;
    value = value - intpart;
    if (value >= 0.5)
        intpart++;

    return intpart;
}

static void
fmtfp(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; /* amount to pad */
    int             zpadlen = 0;
    int             caps = 0;
    long            intpart;
    long            fracpart;

    /*
     * AIX manpage says the default is 0, but Solaris says the default
     * is 6, and sprintf on AIX defaults to 6
     */
    if (max < 0)
        max = 6;

    ufvalue = abs_val(fvalue);

    if (fvalue < 0)
        signvalue = '-';
    else if (flags & DP_F_PLUS) /* Do a sign (+/i) */
        signvalue = '+';
    else if (flags & DP_F_SPACE)
        signvalue = ' ';

#if 0
    if (flags & DP_F_UP)
        caps = 1;               /* Should characters be upper case? */
#endif

    intpart = 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
     */
    fracpart = round((pow10(max)) * (ufvalue - intpart));

    if (fracpart >= pow10(max)) {
        intpart++;
        fracpart -= pow10(max);
    }
#ifdef DEBUG_SNPRINTF
    dprint(1,
           (debugfile, "fmtfp: %f =? %d.%d\n", fvalue, intpart, fracpart));
#endif

    /*
     * Convert integer part 
     */
    do {
        iconvert[iplace++] =
            (caps ? "0123456789ABCDEF" : "0123456789abcdef")[intpart % 10];
        intpart = (intpart / 10);
    } while (intpart && (iplace < 20));
    if (iplace == 20)
        iplace--;
    iconvert[iplace] = 0;

    /*
     * Convert fractional part 
     */
    do {
        fconvert[fplace++] =
            (caps ? "0123456789ABCDEF" : "0123456789abcdef")[fracpart %
                                                             10];
        fracpart = (fracpart / 10);
    } while (fracpart && (fplace < 20));
    if (fplace == 20)
        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;       /* Left Justifty */

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

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

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

        while (fplace > 0)
            dopr_outch(buffer, currlen, maxlen, fconvert[--fplace]);
    }

    while (zpadlen > 0) {
        dopr_outch(buffer, currlen, maxlen, '0');
        --zpadlen;
    }

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

static void
dopr_outch(char *buffer, size_t * currlen, size_t maxlen, char c)
{
    if (*currlen < maxlen)
        buffer[(*currlen)++] = c;
}

#ifndef HAVE_VSNPRINTF
int
vsnprintf(char *str, size_t count, const char *fmt, va_list args)
{
    str[0] = 0;
    dopr(str, count, fmt, args);
    return (strlen(str));
}
#endif                          /* !HAVE_VSNPRINTF */

#ifndef HAVE_SNPRINTF
/*
 * VARARGS3 
 */
#ifdef HAVE_STDARGS
int
snprintf(char *str, size_t count, const char *fmt, ...)
#else
int
snprintf(va_alist)
     va_dcl
#endif
{
#ifndef HAVE_STDARGS
    char           *str;
    size_t          count;
    char           *fmt;
#endif
    VA_LOCAL_DECL;

    VA_START(fmt);
    VA_SHIFT(str, char *);
    VA_SHIFT(count, size_t);
    VA_SHIFT(fmt, char *);
    (void) vsnprintf(str, count, fmt, ap);
    VA_END;
    return (strlen(str));
}
#endif                          /* !HAVE_SNPRINTF */

#ifdef TEST_SNPRINTF
#ifndef LONG_STRING
#define LONG_STRING 1024
#endif
int
main(void)
{
    char            buf1[LONG_STRING];
    char            buf2[LONG_STRING];
    char           *fp_fmt[] = {
        "%-1.5f",
        "%1.5f",
        "%123.9f",
        "%10.5f",
        "% 10.5f",
        "%+22.9f",
        "%+4.9f",
        "%01.3f",
        "%4f",
        "%3.1f",
        "%3.2f",
        "%.0f",
        "%.1f",
        NULL
    };
    double          fp_nums[] =
        { -1.5, 134.21, 91340.2, 341.1234, 0203.9, 0.96, 0.996,
        0.9996, 1.996, 4.136, 0
    };
    char           *int_fmt[] = {
        "%-1.5d",
        "%1.5d",
        "%123.9d",
        "%5.5d",
        "%10.5d",
        "% 10.5d",
        "%+22.33d",
        "%01.3d",
        "%4d",
        NULL
    };
    long            int_nums[] = { -1, 134, 91340, 341, 0203, 0 };
    int             x, y;
    int             fail = 0;
    int             num = 0;

    printf("Testing snprintf format codes against system sprintf...\n");

    for (x = 0; fp_fmt[x] != NULL; x++)
        for (y = 0; fp_nums[y] != 0; y++) {
            snprintf(buf1, sizeof(buf1), fp_fmt[x], fp_nums[y]);
            sprintf(buf2, fp_fmt[x], fp_nums[y]);
            if (strcmp(buf1, buf2)) {
                printf
                    ("snprintf doesn't match Format: %s\n\tsnprintf = %s\n\tsprintf  = %s\n",
                     fp_fmt[x], buf1, buf2);
                fail++;
            }
            num++;
        }

    for (x = 0; int_fmt[x] != NULL; x++)
        for (y = 0; int_nums[y] != 0; y++) {
            snprintf(buf1, sizeof(buf1), int_fmt[x], int_nums[y]);
            sprintf(buf2, int_fmt[x], int_nums[y]);
            if (strcmp(buf1, buf2)) {
                printf
                    ("snprintf doesn't match Format: %s\n\tsnprintf = %s\n\tsprintf  = %s\n",
                     int_fmt[x], buf1, buf2);
                fail++;
            }
            num++;
        }
    printf("%d tests failed out of %d.\n", fail, num);
}
#endif                          /* SNPRINTF_TEST */

#endif                          /* !HAVE_SNPRINTF */