snprintf.c

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/*
         Unix snprintf implementation.
         Version 1.4

         This program is free software; you can redistribute it and/or modify
         it under the terms of the GNU Library General Public License as published by
         the Free Software Foundation; either version 2 of the License, or
         (at your option) any later version.

         This program is distributed in the hope that it will be useful,
         but WITHOUT ANY WARRANTY; without even the implied warranty of
         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.   See the
         GNU Library General Public License for more details.

         You should have received a copy of the GNU Library General Public License
         along with this program; if not, write to the Free Software
         Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

         Revision History:

         1.4:
                        *       integrate in FreeRADIUS's libradius:
                *       Fetched from: http://savannah.gnu.org/cgi-bin/viewcvs/mailutils/mailutils/lib/snprintf.c?rev=1.4
                *       Fetched from: http://savannah.gnu.org/cgi-bin/viewcvs/mailutils/mailutils/lib/snprintf.h?rev=1.4
                *       Replace config.h with autoconf.h
                *       Protect with HAVE_SNPRINTF and HAVE_VSNPRINTF
         1.3:
                        *       add #include <config.h> ifdef HAVE_CONFIG_H
                        *       cosmetic change, when exponent is 0 print xxxE+00
         instead of xxxE-00
         1.2:
                        *       put the program under LGPL.
         1.1:
                        *       added changes from Miles Bader
                        *       corrected a bug with %f
                        *       added support for %#g
                        *       added more comments :-)
         1.0:
                        *       supporting must ANSI syntaxic_sugars
         0.0:
                        *       suppot %s %c %d

 THANKS(for the patches and ideas):
                 Miles Bader
                 Cyrille Rustom
                 Jacek Slabocewiz
                 Mike Parker(mouse)

*/

RCSID("$Id: 4f79a32d64a0ac1388012f7f060347b6d79acddf $")

#include "snprintf.h"

#ifndef HAVE_VSNPRINTF

/*
 * Find the nth power of 10
 */
PRIVATE double
#ifdef __STDC__
pow_10(int n)
#else
pow_10(n)
int n;
#endif
{
        int i;
        double P;

        if (n < 0)
                for (i = 1, P = 1., n = -n ; i <= n ; i++) {P *= .1;}
        else
                for (i = 1, P = 1. ; i <= n ; i++) {P *= 10.0;}
        return P;
}

/*
 * Find the integral part of the log in base 10
 * Note: this not a real log10()
         I just need and approximation(integerpart) of x in:
                10^x ~= r
 * log_10(200) = 2;
 * log_10(250) = 2;
 */
PRIVATE int
#ifdef __STDC__
log_10(double r)
#else
log_10(r)
double r;
#endif
{
        int i = 0;
        double result = 1.;

        if (r < 0.)
                r = -r;

        if (r < 1.) {
                while (result >= r) {result *= .1; i++;}
                return (-i);
        } else {
                while (result <= r) {result *= 10.; i++;}
                return (i - 1);
        }
}

/*
 * This function return the fraction part of a double
 * and set in ip the integral part.
 * In many ways it resemble the modf() found on most Un*x
 */
PRIVATE double
#ifdef __STDC__
integral(double real, double * ip)
#else
integral(real, ip)
double real;
double * ip;
#endif
{
        int j;
        double i, s, p;
        double real_integral = 0.;

/* take care of the obvious */
/* equal to zero ? */
        if (real == 0.) {
                *ip = 0.;
                return (0.);
        }

/* negative number ? */
        if (real < 0.)
                real = -real;

/* a fraction ? */
        if ( real < 1.) {
                *ip = 0.;
                return real;
        }
/* the real work :-) */
        for (j = log_10(real); j >= 0; j--) {
                p = pow_10(j);
                s = (real - real_integral)/p;
                i = 0.;
                while (i + 1. <= s) {i++;}
                real_integral += i*p;
        }
        *ip = real_integral;
        return (real - real_integral);
}

#define PRECISION 1.e-6
/*
 * return an ascii representation of the integral part of the number
 * and set fract to be an ascii representation of the fraction part
 * the container for the fraction and the integral part or staticly
 * declare with fix size
 */
PRIVATE char *
#ifdef __STDC__
numtoa(double number, int base, int precision, char ** fract)
#else
numtoa(number, base, precision, fract)
double number;
int base;
int precision;
char ** fract;
#endif
{
        register int i, j;
        double ip, fp; /* integer and fraction part */
        double fraction;
        int digits = MAX_INT - 1;
        static char integral_part[MAX_INT];
        static char fraction_part[MAX_FRACT];
        double sign;
        int ch;

/* taking care of the obvious case: 0.0 */
        if (number == 0.) {
                integral_part[0] = '0';
                integral_part[1] = '\0';
                fraction_part[0] = '0';
                fraction_part[1] = '\0';
                return integral_part;
        }

/* for negative numbers */
        if ((sign = number) < 0.) {
                number = -number;
                digits--; /* sign consume one digit */
        }

        fraction = integral(number, &ip);
        number = ip;
/* do the integral part */
        if ( ip == 0.) {
                integral_part[0] = '0';
                i = 1;
        } else {
                for ( i = 0; i < digits && number != 0.; ++i) {
                        number /= base;
                        fp = integral(number, &ip);
                        ch = (int)((fp + PRECISION)*base); /* force to round */
                        integral_part[i] = (ch <= 9) ? ch + '0' : ch + 'a' - 10;
                        if (! isxdigit(integral_part[i])) /* bail out overflow !! */
        break;
                        number = ip;
                 }
        }

/* Oh No !! out of bound, ho well fill it up ! */
        if (number != 0.)
                for (i = 0; i < digits; ++i)
                        integral_part[i] = '9';

/* put the sign ? */
        if (sign < 0.)
                integral_part[i++] = '-';

        integral_part[i] = '\0';

/* reverse every thing */
        for ( i--, j = 0; j < i; j++, i--)
                SWAP_INT(integral_part[i], integral_part[j]);

/* the fractionnal part */
        for (i=0, fp=fraction; precision > 0 && i < MAX_FRACT ; i++, precision--        ) {
                fraction_part[i] = (int)((fp + PRECISION)*10. + '0');
                if (! isdigit(fraction_part[i])) /* underflow ? */
                        break;
                fp = (fp*10.0) - (double)(long)((fp + PRECISION)*10.);
        }
        fraction_part[i] = '\0';

        if (fract != (char **)0)
                *fract = fraction_part;

        return integral_part;

}

/* for %d and friends, it puts in holder
 * the representation with the right padding
 */
PRIVATE void
#ifdef __STDC__
decimal(struct DATA *p, double d)
#else
decimal(p, d)
struct DATA *p;
double d;
#endif
{
        char *tmp;

        tmp = itoa(d);
        p->width -= strlen(tmp);
        PAD_RIGHT(p);
        PUT_PLUS(d, p);
        PUT_SPACE(d, p);
        while (*tmp) { /* the integral */
                PUT_CHAR(*tmp, p);
                tmp++;
        }
        PAD_LEFT(p);
}

/* for %o octal representation */
PRIVATE void
#ifdef __STDC__
octal(struct DATA *p, double d)
#else
octal(p, d)
struct DATA *p;
double d;
#endif
{
        char *tmp;

        tmp = otoa(d);
        p->width -= strlen(tmp);
        PAD_RIGHT(p);
        if (p->square == FOUND) /* had prefix '0' for octal */
                PUT_CHAR('0', p);
        while (*tmp) { /* octal */
                PUT_CHAR(*tmp, p);
                tmp++;
        }
        PAD_LEFT(p);
}

/* for %x %X hexadecimal representation */
PRIVATE void
#ifdef __STDC__
hexa(struct DATA *p, double d)
#else
hexa(p, d)
struct DATA *p;
double d;
#endif
{
        char *tmp;

        tmp = htoa(d);
        p->width -= strlen(tmp);
        PAD_RIGHT(p);
        if (p->square == FOUND) { /* prefix '0x' for hexa */
                PUT_CHAR('0', p); PUT_CHAR(*p->pf, p);
        }
        while (*tmp) { /* hexa */
                PUT_CHAR((*p->pf == 'X' ? toupper(*tmp) : *tmp), p);
                tmp++;
        }
        PAD_LEFT(p);
}

/* %s strings */
PRIVATE void
#ifdef __STDC__
strings(struct DATA *p, char *tmp)
#else
strings(p, tmp)
struct DATA *p;
char *tmp;
#endif
{
        int i;

        i = strlen(tmp);
        if (p->precision != NOT_FOUND) /* the smallest number */
                i = (i < p->precision ? i : p->precision);
        p->width -= i;
        PAD_RIGHT(p);
        while (i-- > 0) { /* put the sting */
                PUT_CHAR(*tmp, p);
                tmp++;
        }
        PAD_LEFT(p);
}

/* %f or %g     floating point representation */
PRIVATE void
#ifdef __STDC__
floating(struct DATA *p, double d)
#else
floating(p, d)
struct DATA *p;
double d;
#endif
{
        char *tmp, *tmp2;
        int i;

        DEF_PREC(p);
        d = ROUND(d, p);
        tmp = dtoa(d, p->precision, &tmp2);
        /* calculate the padding. 1 for the dot */
        p->width = p->width -
                        ((d > 0. && p->justify == RIGHT) ? 1:0) -
                        ((p->space == FOUND) ? 1:0) -
                        strlen(tmp) - p->precision - 1;
        PAD_RIGHT(p);
        PUT_PLUS(d, p);
        PUT_SPACE(d, p);
        while (*tmp) { /* the integral */
                PUT_CHAR(*tmp, p);
                tmp++;
        }
        if (p->precision != 0 || p->square == FOUND)
                PUT_CHAR('.', p);       /* put the '.' */
        if (*p->pf == 'g' || *p->pf == 'G') /* smash the trailing zeros */
                for (i = strlen(tmp2) - 1; i >= 0 && tmp2[i] == '0'; i--)
                         tmp2[i] = '\0';
        for (; *tmp2; tmp2++)
                PUT_CHAR(*tmp2, p); /* the fraction */

        PAD_LEFT(p);
}

/* %e %E %g exponent representation */
PRIVATE void
#ifdef __STDC__
exponent(struct DATA *p, double d)
#else
exponent(p, d)
struct DATA *p;
double d;
#endif
{
        char *tmp, *tmp2;
        int j, i;

        DEF_PREC(p);
        j = log_10(d);
        d = d / pow_10(j);      /* get the Mantissa */
        d = ROUND(d, p);
        tmp = dtoa(d, p->precision, &tmp2);
        /* 1 for unit, 1 for the '.', 1 for 'e|E',
         * 1 for '+|-', 3 for 'exp' */
        /* calculate how much padding need */
        p->width = p->width -
                         ((d > 0. && p->justify == RIGHT) ? 1:0) -
                         ((p->space == FOUND) ? 1:0) - p->precision - 7;
        PAD_RIGHT(p);
        PUT_PLUS(d, p);
        PUT_SPACE(d, p);
        while (*tmp) {/* the integral */
                PUT_CHAR(*tmp, p);
                tmp++;
        }
        if (p->precision != 0 || p->square == FOUND)
                PUT_CHAR('.', p);       /* the '.' */
        if (*p->pf == 'g' || *p->pf == 'G') /* smash the trailing zeros */
                for (i = strlen(tmp2) - 1; i >= 0 && tmp2[i] == '0'; i--)
                         tmp2[i] = '\0';
        for (; *tmp2; tmp2++)
                PUT_CHAR(*tmp2, p); /* the fraction */

        if (*p->pf == 'g' || *p->pf == 'e') { /* the exponent put the 'e|E' */
                PUT_CHAR('e', p);
        } else
                PUT_CHAR('E', p);
        if (j >= 0) {   /* the sign of the exp */
                PUT_CHAR('+', p);
        } else {
                PUT_CHAR('-', p);
                j = -j;
        }
        tmp = itoa((double)j);
        if (j < 9) {    /* need to pad the exponent with 0 '000' */
                PUT_CHAR('0', p); PUT_CHAR('0', p);
        } else if (j < 99)
                PUT_CHAR('0', p);
        while (*tmp) { /* the exponent */
                PUT_CHAR(*tmp, p);
                tmp++;
        }
        PAD_LEFT(p);
}

/* initialize the conversion specifiers */
PRIVATE void
#ifdef __STDC__
conv_flag(char * s, struct DATA * p)
#else
conv_flag(s, p)
char * s;
struct DATA * p;
#endif
{
        char number[MAX_FIELD/2];
        int i;

        /* reset the flags.     */
        p->precision = p->width = NOT_FOUND;
        p->star_w = p->star_p = NOT_FOUND;
        p->square = p->space = NOT_FOUND;
        p->a_long = p->justify = NOT_FOUND;
        p->a_longlong = NOT_FOUND;
        p->pad = ' ';

        for(;s && *s ;s++) {
                switch (*s) {
                        case ' ': p->space = FOUND; break;
                        case '#': p->square = FOUND; break;
                        case '*': if (p->width == NOT_FOUND)
                        p->width = p->star_w = FOUND;
                else
                        p->precision = p->star_p = FOUND;
                break;
                        case '+': p->justify = RIGHT; break;
                        case '-': p->justify = LEFT; break;
                        case '.': if (p->width == NOT_FOUND)
                        p->width = 0;
                break;
                        case '0': p->pad = '0'; break;
                        case '1': case '2': case '3':
                        case '4': case '5': case '6':
                        case '7': case '8': case '9':            /* gob all the digits */
        for (i = 0; isdigit(*s); i++, s++)
                if (i < MAX_FIELD/2 - 1)
                        number[i] = *s;
        number[i] = '\0';
        if (p->width == NOT_FOUND)
                p->width = atoi(number);
        else
                p->precision = atoi(number);
        s--;     /* went to far go back */
        break;
                }
        }
}

PUBLIC int
#ifdef __STDC__
vsnprintf(char *string, size_t length, char const * format, va_list args)
#else
vsnprintf(string, length, format, args)
char *string;
size_t length;
char * format;
va_list args;
#endif
{
        struct DATA data;
        char conv_field[MAX_FIELD];
        double d; /* temporary holder */
        int state;
        int i;

        data.length = length - 1; /* leave room for '\0' */
        data.holder = string;
        data.pf = format;
        data.counter = 0;


/* sanity check, the string must be > 1 */
        if (length < 1)
                return -1;


        for (; *data.pf && (data.counter < data.length); data.pf++) {
                if ( *data.pf == '%' ) { /* we got a magic % cookie */
                        conv_flag((char *)0, &data); /* initialise format flags */
                        for (state = 1; *data.pf && state;) {
        switch (*(++data.pf)) {
                case '\0': /* a NULL here ? ? bail out */
                        *data.holder = '\0';
                        return data.counter;
                        break;
                case 'f':       /* float, double */
                        STAR_ARGS(&data);
                        if (data.a_long == FOUND)
                                 d = va_arg(args, LONG_DOUBLE);
                        else
                                 d = va_arg(args, double);
                        floating(&data, d);
                        state = 0;
                        break;
                case 'g':
                case 'G':
                        STAR_ARGS(&data);
                        DEF_PREC(&data);
                        if (data.a_long == FOUND)
                                 d = va_arg(args, LONG_DOUBLE);
                        else
                                 d = va_arg(args, double);
                        i = log_10(d);
                        /*
                         * for '%g|%G' ANSI: use f if exponent
                         * is in the range or [-4,p] exclusively
                         * else use %e|%E
                         */
                        if (-4 < i && i < data.precision)
                                floating(&data, d);
                        else
                                exponent(&data, d);
                        state = 0;
                        break;
                case 'e':
                case 'E':       /* Exponent double */
                        STAR_ARGS(&data);
                        if (data.a_long == FOUND)
                                 d = va_arg(args, LONG_DOUBLE);
                        else
                                 d = va_arg(args, double);
                        exponent(&data, d);
                        state = 0;
                        break;
                case 'u':       /* unsigned decimal */
                        STAR_ARGS(&data);
                        if (data.a_longlong == FOUND)
                                d = va_arg(args, unsigned LONG_LONG);
                        else if (data.a_long == FOUND)
                                d = va_arg(args, unsigned long);
                        else
                                d = va_arg(args, unsigned int);
                        decimal(&data, d);
                        state = 0;
                        break;
                case 'd':       /* decimal */
                        STAR_ARGS(&data);
                        if (data.a_longlong == FOUND)
                                d = va_arg(args, LONG_LONG);
                        else if (data.a_long == FOUND)
                                d = va_arg(args, long);
                        else
                                d = va_arg(args, int);
                        decimal(&data, d);
                        state = 0;
                        break;
                case 'o':       /* octal */
                        STAR_ARGS(&data);
                        if (data.a_longlong == FOUND)
                                d = va_arg(args, LONG_LONG);
                        else if (data.a_long == FOUND)
                                d = va_arg(args, long);
                        else
                                d = va_arg(args, int);
                        octal(&data, d);
                        state = 0;
                        break;
                case 'x':
                case 'X':       /* hexadecimal */
                        STAR_ARGS(&data);
                        if (data.a_longlong == FOUND)
                                d = va_arg(args, LONG_LONG);
                        else if (data.a_long == FOUND)
                                d = va_arg(args, long);
                        else
                                d = va_arg(args, int);
                        hexa(&data, d);
                        state = 0;
                        break;
                case 'c': /* character */
                        d = va_arg(args, int);
                        PUT_CHAR(d, &data);
                        state = 0;
                        break;
                case 's':       /* string */
                        STAR_ARGS(&data);
                        strings(&data, va_arg(args, char *));
                        state = 0;
                        break;
                case 'n':
                        *(va_arg(args, int *)) = data.counter; /* what's the count ? */
                        state = 0;
                        break;
                case 'q':
                        data.a_longlong = FOUND;
                        break;
                case 'L':
                case 'l':
                        if (data.a_long == FOUND)
                                data.a_longlong = FOUND;
                        else
                                data.a_long = FOUND;
                        break;
                case 'h':
                        break;
                case '%':       /* nothing just % */
                        PUT_CHAR('%', &data);
                        state = 0;
                        break;
                case '#': case ' ': case '+': case '*':
                case '-': case '.': case '0': case '1':
                case '2': case '3': case '4': case '5':
                case '6': case '7': case '8': case '9':
                 /* initialize width and precision */
                        for (i = 0; isflag(*data.pf); i++, data.pf++)
                                if (i < MAX_FIELD - 1)
                conv_field[i] = *data.pf;
                        conv_field[i] = '\0';
                        conv_flag(conv_field, &data);
                        data.pf--;       /* went to far go back */
                        break;
                default:
                        /* is this an error ? maybe bail out */
                        state = 0;
                        break;
        } /* end switch */
                        } /* end of for state */
                } else { /* not % */
                        PUT_CHAR(*data.pf, &data);      /* add the char the string */
                }
        }

        *data.holder = '\0'; /* the end ye ! */

        return data.counter;
}

#endif /* HAVE_VSNPRINTF */

#ifndef HAVE_SNPRINTF

PUBLIC int
#if __STDC__
snprintf(char *string, size_t length, char const * format, ...)
#else
snprintf(string, length, format, va_alist)
char *string;
size_t length;
char * format;
va_dcl
#endif
{
        int rval;
        va_list args;

#if __STDC__
        va_start(args, format);
#else
        va_start(args);
#endif

        rval = vsnprintf (string, length, format, args);

        va_end(args);

        return rval;
}

#endif /* HAVE_SNPRINTF */


#ifdef DRIVER

#include <stdio.h>

/* set of small tests for snprintf() */
int main()
{
        char holder[100];
        int i;

/*
        printf("Suite of test for snprintf:\n");
        printf("a_format\n");
        printf("printf() format\n");
        printf("snprintf() format\n\n");
*/
/* Checking the field widths */

        printf("/%%d/, 336\n");
        snprintf(holder, sizeof holder, "/%d/\n", 336);
        printf("/%d/\n", 336);
        printf("%s\n", holder);

        printf("/%%2d/, 336\n");
        snprintf(holder, sizeof holder, "/%2d/\n", 336);
        printf("/%2d/\n", 336);
        printf("%s\n", holder);

        printf("/%%10d/, 336\n");
        snprintf(holder, sizeof holder, "/%10d/\n", 336);
        printf("/%10d/\n", 336);
        printf("%s\n", holder);

        printf("/%%-10d/, 336\n");
        snprintf(holder, sizeof holder, "/%-10d/\n", 336);
        printf("/%-10d/\n", 336);
        printf("%s\n", holder);

/* long long    */

        printf("/%%lld/, 336\n");
        snprintf(holder, sizeof holder, "/%lld/\n", (LONG_LONG)336);
        printf("/%lld/\n", (LONG_LONG)336);
        printf("%s\n", holder);

        printf("/%%2qd/, 336\n");
        snprintf(holder, sizeof holder, "/%2qd/\n", (LONG_LONG)336);
        printf("/%2qd/\n", (LONG_LONG)336);
        printf("%s\n", holder);

/* floating points */

        printf("/%%f/, 1234.56\n");
        snprintf(holder, sizeof holder, "/%f/\n", 1234.56);
        printf("/%f/\n", 1234.56);
        printf("%s\n", holder);

        printf("/%%e/, 1234.56\n");
        snprintf(holder, sizeof holder, "/%e/\n", 1234.56);
        printf("/%e/\n", 1234.56);
        printf("%s\n", holder);

        printf("/%%4.2f/, 1234.56\n");
        snprintf(holder, sizeof holder, "/%4.2f/\n", 1234.56);
        printf("/%4.2f/\n", 1234.56);
        printf("%s\n", holder);

        printf("/%%3.1f/, 1234.56\n");
        snprintf(holder, sizeof holder, "/%3.1f/\n", 1234.56);
        printf("/%3.1f/\n", 1234.56);
        printf("%s\n", holder);

        printf("/%%10.3f/, 1234.56\n");
        snprintf(holder, sizeof holder, "/%10.3f/\n", 1234.56);
        printf("/%10.3f/\n", 1234.56);
        printf("%s\n", holder);

        printf("/%%10.3e/, 1234.56\n");
        snprintf(holder, sizeof holder, "/%10.3e/\n", 1234.56);
        printf("/%10.3e/\n", 1234.56);
        printf("%s\n", holder);

        printf("/%%+4.2f/, 1234.56\n");
        snprintf(holder, sizeof holder, "/%+4.2f/\n", 1234.56);
        printf("/%+4.2f/\n", 1234.56);
        printf("%s\n", holder);

        printf("/%%010.2f/, 1234.56\n");
        snprintf(holder, sizeof holder, "/%010.2f/\n", 1234.56);
        printf("/%010.2f/\n", 1234.56);
        printf("%s\n", holder);

#define BLURB "Outstanding acting !"
/* strings precisions */

        printf("/%%2s/, \"%s\"\n", BLURB);
        snprintf(holder, sizeof holder, "/%2s/\n", BLURB);
        printf("/%2s/\n", BLURB);
        printf("%s\n", holder);

        printf("/%%22s/ %s\n", BLURB);
        snprintf(holder, sizeof holder, "/%22s/\n", BLURB);
        printf("/%22s/\n", BLURB);
        printf("%s\n", holder);

        printf("/%%22.5s/ %s\n", BLURB);
        snprintf(holder, sizeof holder, "/%22.5s/\n", BLURB);
        printf("/%22.5s/\n", BLURB);
        printf("%s\n", holder);

        printf("/%%-22.5s/ %s\n", BLURB);
        snprintf(holder, sizeof holder, "/%-22.5s/\n", BLURB);
        printf("/%-22.5s/\n", BLURB);
        printf("%s\n", holder);

/* see some flags */

        printf("%%x %%X %%#x, 31, 31, 31\n");
        snprintf(holder, sizeof holder, "%x %X %#x\n", 31, 31, 31);
        printf("%x %X %#x\n", 31, 31, 31);
        printf("%s\n", holder);

        printf("**%%d**%% d**%% d**, 42, 42, -42\n");
        snprintf(holder, sizeof holder, "**%d**% d**% d**\n", 42, 42, -42);
        printf("**%d**% d**% d**\n", 42, 42, -42);
        printf("%s\n", holder);

/* other flags */

        printf("/%%g/, 31.4\n");
        snprintf(holder, sizeof holder, "/%g/\n", 31.4);
        printf("/%g/\n", 31.4);
        printf("%s\n", holder);

        printf("/%%.6g/, 31.4\n");
        snprintf(holder, sizeof holder, "/%.6g/\n", 31.4);
        printf("/%.6g/\n", 31.4);
        printf("%s\n", holder);

        printf("/%%.1G/, 31.4\n");
        snprintf(holder, sizeof holder, "/%.1G/\n", 31.4);
        printf("/%.1G/\n", 31.4);
        printf("%s\n", holder);

        printf("abc%%n\n");
        printf("abc%n", &i); printf("%d\n", i);
        snprintf(holder, sizeof holder, "abc%n", &i);
        printf("%s", holder); printf("%d\n\n", i);

        printf("%%*.*s --> 10.10\n");
        snprintf(holder, sizeof holder, "%*.*s\n", 10, 10, BLURB);
        printf("%*.*s\n", 10, 10, BLURB);
        printf("%s\n", holder);

        printf("%%%%%%%%\n");
        snprintf(holder, sizeof holder, "%%%%\n");
        printf("%%%%\n");
        printf("%s\n", holder);

#define BIG "Hello this is a too big string for the buffer"
/*      printf("A buffer to small of 10, trying to put this:\n");*/
        printf("<%%>, %s\n", BIG);
        i = snprintf(holder, 10, "%s\n", BIG);
        printf("<%s>\n", BIG);
        printf("<%s>\n", holder);

        return 0;
}
#endif /* !DRIVER */