[openssh.git] / openbsd-compat / bsd-snprintf.c

/**************************************************************
 * Original:
 * Patrick Powell Tue Apr 11 09:48:21 PDT 1995
 * A bombproof version of doprnt (dopr) included.
 * Sigh.  This sort of thing is always nasty do deal with.  Note that
 * the version here does not include floating point...
 *
 * snprintf() is used instead of sprintf() as it does limit checks
 * for string length.  This covers a nasty loophole.
 *
 * The other functions are there to prevent NULL pointers from
 * causing nast effects.
 *
 * More Recently:
 *  Brandon Long <blong@fiction.net> 9/15/96 for mutt 0.43
 *  This was ugly.  It is still ugly.  I opted out of floating point
 *  numbers, but the formatter understands just about everything
 *  from the normal C string format, at least as far as I can tell from
 *  the Solaris 2.5 printf(3S) man page.
 *
 *  Brandon Long <blong@fiction.net> 10/22/97 for mutt 0.87.1
 *    Ok, added some minimal floating point support, which means this
 *    probably requires libm on most operating systems.  Don't yet
 *    support the exponent (e,E) and sigfig (g,G).  Also, fmtint()
 *    was pretty badly broken, it just wasn't being exercised in ways
 *    which showed it, so that's been fixed.  Also, formated the code
 *    to mutt conventions, and removed dead code left over from the
 *    original.  Also, there is now a builtin-test, just compile with:
 *           gcc -DTEST_SNPRINTF -o snprintf snprintf.c -lm
 *    and run snprintf for results.
 * 
 *  Thomas Roessler <roessler@guug.de> 01/27/98 for mutt 0.89i
 *    The PGP code was using unsigned hexadecimal formats. 
 *    Unfortunately, unsigned formats simply didn't work.
 *
 *  Michael Elkins <me@cs.hmc.edu> 03/05/98 for mutt 0.90.8
 *    The original code assumed that both snprintf() and vsnprintf() were
 *    missing.  Some systems only have snprintf() but not vsnprintf(), so
 *    the code is now broken down under HAVE_SNPRINTF and HAVE_VSNPRINTF.
 *
 *  Ben Lindstrom <mouring@eviladmin.org> 09/27/00 for OpenSSH
 *    Welcome to the world of %lld and %qd support.  With other
 *    long long support.  This is needed for sftp-server to work
 *    right.
 *
 *  Ben Lindstrom <mouring@eviladmin.org> 02/12/01 for OpenSSH
 *    Removed all hint of VARARGS stuff and banished it to the void,
 *    and did a bit of KNF style work to make things a bit more
 *    acceptable.  Consider stealing from mutt or enlightenment.
 **************************************************************/

#include "includes.h"

RCSID("$Id$");

#if !defined(HAVE_SNPRINTF) || !defined(HAVE_VSNPRINTF)

static void 
dopr(char *buffer, size_t maxlen, const char *format, va_list args);

static void 
fmtstr(char *buffer, size_t *currlen, size_t maxlen, char *value, int flags, 
       int min, int max);

static void 
fmtint(char *buffer, size_t *currlen, size_t maxlen, long value, int base, 
       int min, int max, int flags);

static void 
fmtfp(char *buffer, size_t *currlen, size_t maxlen, long double fvalue, 
      int min, int max, int flags);

/*
 * dopr(): poor man's version of doprintf
 */

/* format read states */
#define DP_S_DEFAULT 0
#define DP_S_FLAGS   1
#define DP_S_MIN     2
#define DP_S_DOT     3
#define DP_S_MAX     4
#define DP_S_MOD     5
#define DP_S_CONV    6
#define DP_S_DONE    7

/* format flags - Bits */
#define DP_F_MINUS 	(1 << 0)
#define DP_F_PLUS  	(1 << 1)
#define DP_F_SPACE 	(1 << 2)
#define DP_F_NUM   	(1 << 3)
#define DP_F_ZERO  	(1 << 4)
#define DP_F_UP    	(1 << 5)
#define DP_F_UNSIGNED 	(1 << 6)

/* Conversion Flags */
#define DP_C_SHORT     1
#define DP_C_LONG      2
#define DP_C_LDOUBLE   3
#define DP_C_LONG_LONG 4

#define char_to_int(p) (p - '0')
#define abs_val(p) (p < 0 ? -p : p)


static void 
dopr(char *buffer, size_t maxlen, const char *format, va_list args)
{
	char *strvalue;
	char ch;
	long value;
	long double fvalue;
	int min = 0;
	int max = -1;
	int state = DP_S_DEFAULT;
	int flags = 0;
	int cflags = 0;
	size_t currlen = 0;
  
	ch = *format++;

	while (state != DP_S_DONE) {
		if ((ch == '\0') || (currlen >= maxlen)) 
			state = DP_S_DONE;

		switch(state) {
			case DP_S_DEFAULT:
				if (ch == '%') 
					state = DP_S_FLAGS;
				else 
					dopr_outch(buffer, &currlen, maxlen, ch);
				ch = *format++;
				break;
			case DP_S_FLAGS:
				switch (ch) {
					case '-':
						flags |= DP_F_MINUS;
						ch = *format++;
						break;
					case '+':
						flags |= DP_F_PLUS;
						ch = *format++;
						break;
					case ' ':
						flags |= DP_F_SPACE;
						ch = *format++;
						break;
					case '#':
						flags |= DP_F_NUM;
						ch = *format++;
						break;
					case '0':
						flags |= DP_F_ZERO;
						ch = *format++;
						break;
					default:
						state = DP_S_MIN;
						break;
				}
				break;
			case DP_S_MIN:
				if (isdigit((unsigned char)ch)) {
					min = 10*min + char_to_int (ch);
					ch = *format++;
				} else if (ch == '*') {
					min = va_arg (args, int);
					ch = *format++;
					state = DP_S_DOT;
				} else 
					state = DP_S_DOT;
				break;
			case DP_S_DOT:
				if (ch == '.') {
					state = DP_S_MAX;
					ch = *format++;
				} else 
					state = DP_S_MOD;
				break;
			case DP_S_MAX:
				if (isdigit((unsigned char)ch)) {
					if (max < 0)
						max = 0;
					max = 10*max + char_to_int(ch);
					ch = *format++;
				} else if (ch == '*') {
					max = va_arg (args, int);
					ch = *format++;
					state = DP_S_MOD;
				} else 
					state = DP_S_MOD;
				break;
			case DP_S_MOD:
				switch (ch) {
					case 'h':
						cflags = DP_C_SHORT;
						ch = *format++;
						break;
					case 'l':
						cflags = DP_C_LONG;
						ch = *format++;
						if (ch == 'l') {
							cflags = DP_C_LONG_LONG;
							ch = *format++;
						}
						break;
					case 'q':
						cflags = DP_C_LONG_LONG;
						ch = *format++;
						break;
					case 'L':
						cflags = DP_C_LDOUBLE;
						ch = *format++;
						break;
					default:
						break;
				}
				state = DP_S_CONV;
				break;
			case DP_S_CONV:
				switch (ch) {
					case 'd':
					case 'i':
						if (cflags == DP_C_SHORT) 
							value = va_arg(args, int);
						else if (cflags == DP_C_LONG)
							value = va_arg(args, long int);
						else if (cflags == DP_C_LONG_LONG)
							value = va_arg (args, long long);
						else
							value = va_arg (args, int);
						fmtint(buffer, &currlen, maxlen, value, 10, min, max, flags);
						break;
					case 'o':
						flags |= DP_F_UNSIGNED;
						if (cflags == DP_C_SHORT)
							value = va_arg(args, unsigned int);
						else if (cflags == DP_C_LONG)
							value = va_arg(args, unsigned long int);
						else if (cflags == DP_C_LONG_LONG)
							value = va_arg(args, unsigned long long);
						else
							value = va_arg(args, unsigned int);
						fmtint(buffer, &currlen, maxlen, value, 8, min, max, flags);
						break;
					case 'u':
						flags |= DP_F_UNSIGNED;
						if (cflags == DP_C_SHORT)
							value = va_arg(args, unsigned int);
						else if (cflags == DP_C_LONG)
							value = va_arg(args, unsigned long int);
						else if (cflags == DP_C_LONG_LONG)
							value = va_arg(args, unsigned long long);
						else
							value = va_arg(args, unsigned int);
						fmtint (buffer, &currlen, maxlen, value, 10, min, max, flags);
						break;
					case 'X':
						flags |= DP_F_UP;
					case 'x':
						flags |= DP_F_UNSIGNED;
						if (cflags == DP_C_SHORT)
							value = va_arg(args, unsigned int);
						else if (cflags == DP_C_LONG)
							value = va_arg(args, unsigned long int);
						else if (cflags == DP_C_LONG_LONG)
							value = va_arg(args, unsigned long long);
						else
							value = va_arg(args, unsigned int);
						fmtint(buffer, &currlen, maxlen, value, 16, min, max, flags);
						break;
					case 'f':
						if (cflags == DP_C_LDOUBLE)
							fvalue = va_arg(args, long double);
						else
							fvalue = va_arg(args, double);
						/* um, floating point? */
						fmtfp(buffer, &currlen, maxlen, fvalue, min, max, flags);
						break;
					case 'E':
						flags |= DP_F_UP;
					case 'e':
						if (cflags == DP_C_LDOUBLE)
							fvalue = va_arg(args, long double);
						else
							fvalue = va_arg(args, double);
						break;
					case 'G':
						flags |= DP_F_UP;
					case 'g':
						if (cflags == DP_C_LDOUBLE)
							fvalue = va_arg(args, long double);
						else
							fvalue = va_arg(args, double);
						break;
					case 'c':
						dopr_outch(buffer, &currlen, maxlen, va_arg(args, int));
						break;
					case 's':
						strvalue = va_arg(args, char *);
						if (max < 0) 
							max = maxlen; /* ie, no max */
						fmtstr(buffer, &currlen, maxlen, strvalue, flags, min, max);
						break;
					case 'p':
						strvalue = va_arg(args, void *);
						fmtint(buffer, &currlen, maxlen, (long) strvalue, 16, min, max, flags);
						break;
					case 'n':
						if (cflags == DP_C_SHORT) {
							short int *num;
							num = va_arg(args, short int *);
							*num = currlen;
						} else if (cflags == DP_C_LONG) {
							long int *num;
							num = va_arg(args, long int *);
							*num = currlen;
						} else if (cflags == DP_C_LONG_LONG) {
							long long *num;
							num = va_arg(args, long long *);
							*num = currlen;
						} else {
							int *num;
							num = va_arg(args, int *);
							*num = currlen;
						}
						break;
					case '%':
						dopr_outch(buffer, &currlen, maxlen, ch);
						break;
					case 'w': /* not supported yet, treat as next char */
						ch = *format++;
						break;
					default: /* Unknown, skip */
					break;
				}
				ch = *format++;
				state = DP_S_DEFAULT;
				flags = cflags = min = 0;
				max = -1;
				break;
			case DP_S_DONE:
				break;
			default: /* hmm? */
				break; /* some picky compilers need this */
		}
	}
	if (currlen < maxlen - 1) 
		buffer[currlen] = '\0';
	else 
		buffer[maxlen - 1] = '\0';
}

static void
fmtstr(char *buffer, size_t *currlen, size_t maxlen,
       char *value, int flags, int min, int max)
{
	int padlen, strln;     /* amount to pad */
	int cnt = 0;
  
	if (value == 0) 
		value = "<NULL>";

	for (strln = 0; value[strln]; ++strln); /* strlen */
	padlen = min - strln;
	if (padlen < 0) 
		padlen = 0;
	if (flags & DP_F_MINUS) 
		padlen = -padlen; /* Left Justify */

	while ((padlen > 0) && (cnt < max)) {
		dopr_outch(buffer, currlen, maxlen, ' ');
		--padlen;
		++cnt;
	}
	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)
{
	unsigned long uvalue;
	char convert[20];
	int signvalue = 0;
	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 */


	/* 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 long double 
pow10(int exp)
{
	long double result = 1;

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

static long 
round(long double value)
{
	long intpart = value;

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

	return intpart;
}

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

	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);
	}

	/* 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.
	 */
	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;
}
#endif /* !defined(HAVE_SNPRINTF) || !defined(HAVE_VSNPRINTF) */

#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
int 
snprintf(char *str,size_t count,const char *fmt,...)
{
	va_list ap;

	va_start(ap, fmt);
	(void) vsnprintf(str, count, fmt, ap);
	va_end(ap);

	return(strlen(str));
}

#ifdef TEST_SNPRINTF
int 
main(void)
{
#define LONG_STRING 1024
	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",
		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",
		"%lld",
		"%qd",
		NULL
	};
	long long int_nums[] = { -1, 134, 91340, 341, 0203, 0, 9999999 };
	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\t"
                                       "snprintf = %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\t"
				       "snprintf = %s\n\tsprintf  = %s\n", 
					int_fmt[x], buf1, buf2);
				fail++;
			}
			num++;
		}
	}
	printf("%d tests failed out of %d.\n", fail, num);
	return(0);
}
#endif /* SNPRINTF_TEST */

#endif /* !HAVE_SNPRINTF */
Commit	Line	Data
2d9a148e	1	/**************************************************************
	2	* Original:
	3	* Patrick Powell Tue Apr 11 09:48:21 PDT 1995
	4	* A bombproof version of doprnt (dopr) included.
	5	* Sigh. This sort of thing is always nasty do deal with. Note that
	6	* the version here does not include floating point...
dad3b556	7	*
2d9a148e	8	* snprintf() is used instead of sprintf() as it does limit checks
2d9a148e	9	* for string length. This covers a nasty loophole.
dad3b556	10	*
2d9a148e	11	* The other functions are there to prevent NULL pointers from
2d9a148e	12	* causing nast effects.
dad3b556	13	*
2d9a148e	14	* More Recently:
	15	* Brandon Long <blong@fiction.net> 9/15/96 for mutt 0.43
	16	* This was ugly. It is still ugly. I opted out of floating point
	17	* numbers, but the formatter understands just about everything
	18	* from the normal C string format, at least as far as I can tell from
	19	* the Solaris 2.5 printf(3S) man page.
	20	*
	21	* Brandon Long <blong@fiction.net> 10/22/97 for mutt 0.87.1
	22	* Ok, added some minimal floating point support, which means this
	23	* probably requires libm on most operating systems. Don't yet
	24	* support the exponent (e,E) and sigfig (g,G). Also, fmtint()
	25	* was pretty badly broken, it just wasn't being exercised in ways
	26	* which showed it, so that's been fixed. Also, formated the code
	27	* to mutt conventions, and removed dead code left over from the
	28	* original. Also, there is now a builtin-test, just compile with:
	29	* gcc -DTEST_SNPRINTF -o snprintf snprintf.c -lm
	30	* and run snprintf for results.
	31	*
	32	* Thomas Roessler <roessler@guug.de> 01/27/98 for mutt 0.89i
	33	* The PGP code was using unsigned hexadecimal formats.
	34	* Unfortunately, unsigned formats simply didn't work.
	35	*
	36	* Michael Elkins <me@cs.hmc.edu> 03/05/98 for mutt 0.90.8
	37	* The original code assumed that both snprintf() and vsnprintf() were
	38	* missing. Some systems only have snprintf() but not vsnprintf(), so
	39	* the code is now broken down under HAVE_SNPRINTF and HAVE_VSNPRINTF.
	40	*
f1312c76	41	* Ben Lindstrom <mouring@eviladmin.org> 09/27/00 for OpenSSH
c73b8e3a	42	* Welcome to the world of %lld and %qd support. With other
	43	* long long support. This is needed for sftp-server to work
	44	* right.
f1312c76	45	*
	46	* Ben Lindstrom <mouring@eviladmin.org> 02/12/01 for OpenSSH
	47	* Removed all hint of VARARGS stuff and banished it to the void,
	48	* and did a bit of KNF style work to make things a bit more
	49	* acceptable. Consider stealing from mutt or enlightenment.
2d9a148e	50	**************************************************************/
dad3b556	51
0b202697	52	#include "includes.h"
	53
	54	RCSID("$Id$");
dad3b556	55
2d9a148e	56	#if !defined(HAVE_SNPRINTF) \|\| !defined(HAVE_VSNPRINTF)
dad3b556	57
f1312c76	58	static void
	59	dopr(char buffer, size_t maxlen, const char format, va_list args);
	60
	61	static void
	62	fmtstr(char buffer, size_t currlen, size_t maxlen, char *value, int flags,
	63	int min, int max);
	64
	65	static void
	66	fmtint(char buffer, size_t currlen, size_t maxlen, long value, int base,
	67	int min, int max, int flags);
	68
	69	static void
	70	fmtfp(char buffer, size_t currlen, size_t maxlen, long double fvalue,
	71	int min, int max, int flags);
2d9a148e	72
	73	/*
	74	* dopr(): poor man's version of doprintf
	75	*/
	76
	77	/* format read states */
	78	#define DP_S_DEFAULT 0
	79	#define DP_S_FLAGS 1
	80	#define DP_S_MIN 2
	81	#define DP_S_DOT 3
	82	#define DP_S_MAX 4
	83	#define DP_S_MOD 5
	84	#define DP_S_CONV 6
	85	#define DP_S_DONE 7
	86
	87	/* format flags - Bits */
	88	#define DP_F_MINUS (1 << 0)
	89	#define DP_F_PLUS (1 << 1)
	90	#define DP_F_SPACE (1 << 2)
	91	#define DP_F_NUM (1 << 3)
	92	#define DP_F_ZERO (1 << 4)
	93	#define DP_F_UP (1 << 5)
	94	#define DP_F_UNSIGNED (1 << 6)
	95
	96	/* Conversion Flags */
c73b8e3a	97	#define DP_C_SHORT 1
	98	#define DP_C_LONG 2
	99	#define DP_C_LDOUBLE 3
	100	#define DP_C_LONG_LONG 4
2d9a148e	101
2d9a148e	102	#define char_to_int(p) (p - '0')
f1312c76	103	#define abs_val(p) (p < 0 ? -p : p)
2d9a148e	104
f1312c76	105
	106	static void
	107	dopr(char buffer, size_t maxlen, const char format, va_list args)
2d9a148e	108	{
f1312c76	109	char *strvalue;
	110	char ch;
	111	long value;
	112	long double fvalue;
	113	int min = 0;
	114	int max = -1;
	115	int state = DP_S_DEFAULT;
	116	int flags = 0;
	117	int cflags = 0;
	118	size_t currlen = 0;
2d9a148e	119
2d9a148e	120	ch = *format++;
f1312c76	121
	122	while (state != DP_S_DONE) {
	123	if ((ch == '\0') \|\| (currlen >= maxlen))
	124	state = DP_S_DONE;
	125
	126	switch(state) {
	127	case DP_S_DEFAULT:
	128	if (ch == '%')
	129	state = DP_S_FLAGS;
	130	else
	131	dopr_outch(buffer, &currlen, maxlen, ch);
	132	ch = *format++;
	133	break;
	134	case DP_S_FLAGS:
	135	switch (ch) {
	136	case '-':
	137	flags \|= DP_F_MINUS;
	138	ch = *format++;
	139	break;
	140	case '+':
	141	flags \|= DP_F_PLUS;
	142	ch = *format++;
	143	break;
	144	case ' ':
	145	flags \|= DP_F_SPACE;
	146	ch = *format++;
	147	break;
	148	case '#':
	149	flags \|= DP_F_NUM;
	150	ch = *format++;
	151	break;
	152	case '0':
	153	flags \|= DP_F_ZERO;
	154	ch = *format++;
	155	break;
	156	default:
	157	state = DP_S_MIN;
	158	break;
	159	}
	160	break;
	161	case DP_S_MIN:
	162	if (isdigit((unsigned char)ch)) {
	163	min = 10*min + char_to_int (ch);
	164	ch = *format++;
	165	} else if (ch == '*') {
	166	min = va_arg (args, int);
	167	ch = *format++;
	168	state = DP_S_DOT;
	169	} else
	170	state = DP_S_DOT;
	171	break;
	172	case DP_S_DOT:
	173	if (ch == '.') {
	174	state = DP_S_MAX;
	175	ch = *format++;
	176	} else
	177	state = DP_S_MOD;
	178	break;
	179	case DP_S_MAX:
	180	if (isdigit((unsigned char)ch)) {
	181	if (max < 0)
	182	max = 0;
	183	max = 10*max + char_to_int(ch);
	184	ch = *format++;
185	} else if (ch == '*') {
186	max = va_arg (args, int);
187	ch = *format++;
188	state = DP_S_MOD;
189	} else
190	state = DP_S_MOD;
191	break;
192	case DP_S_MOD:
193	switch (ch) {
194	case 'h':
195	cflags = DP_C_SHORT;
196	ch = *format++;
197	break;
198	case 'l':
199	cflags = DP_C_LONG;
200	ch = *format++;
201	if (ch == 'l') {
202	cflags = DP_C_LONG_LONG;
203	ch = *format++;
204	}
205	break;
206	case 'q':
207	cflags = DP_C_LONG_LONG;
208	ch = *format++;
209	break;
210	case 'L':
211	cflags = DP_C_LDOUBLE;
212	ch = *format++;
213	break;
214	default:
215	break;
216	}
217	state = DP_S_CONV;
218	break;
219	case DP_S_CONV:
220	switch (ch) {
221	case 'd':
222	case 'i':
223	if (cflags == DP_C_SHORT)
224	value = va_arg(args, int);
225	else if (cflags == DP_C_LONG)
226	value = va_arg(args, long int);
227	else if (cflags == DP_C_LONG_LONG)
228	value = va_arg (args, long long);
229	else
230	value = va_arg (args, int);
231	fmtint(buffer, &currlen, maxlen, value, 10, min, max, flags);
232	break;
233	case 'o':
234	flags \|= DP_F_UNSIGNED;
235	if (cflags == DP_C_SHORT)
236	value = va_arg(args, unsigned int);
237	else if (cflags == DP_C_LONG)
238	value = va_arg(args, unsigned long int);
239	else if (cflags == DP_C_LONG_LONG)
240	value = va_arg(args, unsigned long long);
241	else
242	value = va_arg(args, unsigned int);
243	fmtint(buffer, &currlen, maxlen, value, 8, min, max, flags);
244	break;
245	case 'u':
246	flags \|= DP_F_UNSIGNED;
247	if (cflags == DP_C_SHORT)
248	value = va_arg(args, unsigned int);
249	else if (cflags == DP_C_LONG)
250	value = va_arg(args, unsigned long int);
251	else if (cflags == DP_C_LONG_LONG)
252	value = va_arg(args, unsigned long long);
253	else
254	value = va_arg(args, unsigned int);
255	fmtint (buffer, &currlen, maxlen, value, 10, min, max, flags);
256	break;
257	case 'X':
258	flags \|= DP_F_UP;
259	case 'x':
260	flags \|= DP_F_UNSIGNED;
261	if (cflags == DP_C_SHORT)
262	value = va_arg(args, unsigned int);
263	else if (cflags == DP_C_LONG)
264	value = va_arg(args, unsigned long int);
265	else if (cflags == DP_C_LONG_LONG)
266	value = va_arg(args, unsigned long long);
267	else
268	value = va_arg(args, unsigned int);
269	fmtint(buffer, &currlen, maxlen, value, 16, min, max, flags);
270	break;
271	case 'f':
272	if (cflags == DP_C_LDOUBLE)
273	fvalue = va_arg(args, long double);
274	else
275	fvalue = va_arg(args, double);
276	/* um, floating point? */
277	fmtfp(buffer, &currlen, maxlen, fvalue, min, max, flags);
278	break;
279	case 'E':
280	flags \|= DP_F_UP;
281	case 'e':
282	if (cflags == DP_C_LDOUBLE)
283	fvalue = va_arg(args, long double);
284	else
285	fvalue = va_arg(args, double);
286	break;
287	case 'G':
288	flags \|= DP_F_UP;
289	case 'g':
290	if (cflags == DP_C_LDOUBLE)
291	fvalue = va_arg(args, long double);
292	else
293	fvalue = va_arg(args, double);
294	break;
295	case 'c':
296	dopr_outch(buffer, &currlen, maxlen, va_arg(args, int));
297	break;
298	case 's':
299	strvalue = va_arg(args, char *);
300	if (max < 0)
301	max = maxlen; /* ie, no max */
302	fmtstr(buffer, &currlen, maxlen, strvalue, flags, min, max);
303	break;
304	case 'p':
305	strvalue = va_arg(args, void *);
306	fmtint(buffer, &currlen, maxlen, (long) strvalue, 16, min, max, flags);
307	break;
308	case 'n':
309	if (cflags == DP_C_SHORT) {
310	short int *num;
311	num = va_arg(args, short int *);
312	*num = currlen;
313	} else if (cflags == DP_C_LONG) {
314	long int *num;
315	num = va_arg(args, long int *);
316	*num = currlen;
317	} else if (cflags == DP_C_LONG_LONG) {
318	long long *num;
319	num = va_arg(args, long long *);
320	*num = currlen;
321	} else {
322	int *num;
323	num = va_arg(args, int *);
324	*num = currlen;
325	}
326	break;
327	case '%':
328	dopr_outch(buffer, &currlen, maxlen, ch);
329	break;
330	case 'w': /* not supported yet, treat as next char */
331	ch = *format++;
332	break;
333	default: /* Unknown, skip */
334	break;
335	}
336	ch = *format++;
337	state = DP_S_DEFAULT;
338	flags = cflags = min = 0;
339	max = -1;
340	break;
341	case DP_S_DONE:
342	break;
343	default: /* hmm? */
344	break; /* some picky compilers need this */
345	}
346	}
347	if (currlen < maxlen - 1)
348	buffer[currlen] = '\0';
2d9a148e	349	else
f1312c76	350	buffer[maxlen - 1] = '\0';
2d9a148e	351	}
2d9a148e	352
f1312c76	353	static void
	354	fmtstr(char buffer, size_t currlen, size_t maxlen,
	355	char *value, int flags, int min, int max)
2d9a148e	356	{
f1312c76	357	int padlen, strln; /* amount to pad */
f1312c76	358	int cnt = 0;
2d9a148e	359
f1312c76	360	if (value == 0)
	361	value = "<NULL>";
	362
	363	for (strln = 0; value[strln]; ++strln); /* strlen */
	364	padlen = min - strln;
	365	if (padlen < 0)
	366	padlen = 0;
	367	if (flags & DP_F_MINUS)
	368	padlen = -padlen; /* Left Justify */
	369
	370	while ((padlen > 0) && (cnt < max)) {
	371	dopr_outch(buffer, currlen, maxlen, ' ');
	372	--padlen;
	373	++cnt;
	374	}
	375	while (*value && (cnt < max)) {
	376	dopr_outch(buffer, currlen, maxlen, *value++);
	377	++cnt;
	378	}
	379	while ((padlen < 0) && (cnt < max)) {
	380	dopr_outch(buffer, currlen, maxlen, ' ');
	381	++padlen;
	382	++cnt;
	383	}
2d9a148e	384	}
	385
	386	/* Have to handle DP_F_NUM (ie 0x and 0 alternates) */
	387
f1312c76	388	static void
	389	fmtint(char buffer, size_t currlen, size_t maxlen,
	390	long value, int base, int min, int max, int flags)
2d9a148e	391	{
f1312c76	392	unsigned long uvalue;
	393	char convert[20];
	394	int signvalue = 0;
	395	int place = 0;
	396	int spadlen = 0; /* amount to space pad */
	397	int zpadlen = 0; /* amount to zero pad */
	398	int caps = 0;
2d9a148e	399
f1312c76	400	if (max < 0)
	401	max = 0;
	402
	403	uvalue = value;
	404
	405	if (!(flags & DP_F_UNSIGNED)) {
	406	if (value < 0) {
	407	signvalue = '-';
	408	uvalue = -value;
	409	} else if (flags & DP_F_PLUS) /* Do a sign (+/i) */
	410	signvalue = '+';
	411	else if (flags & DP_F_SPACE)
	412	signvalue = ' ';
	413	}
2d9a148e	414
f1312c76	415	if (flags & DP_F_UP)
	416	caps = 1; /* Should characters be upper case? */
	417
	418	do {
	419	convert[place++] =
	420	(caps? "0123456789ABCDEF":"0123456789abcdef")
	421	[uvalue % (unsigned)base];
	422	uvalue = (uvalue / (unsigned)base );
	423	} while (uvalue && (place < 20));
	424	if (place == 20)
	425	place--;
	426	convert[place] = 0;
	427
	428	zpadlen = max - place;
	429	spadlen = min - MAX (max, place) - (signvalue ? 1 : 0);
	430	if (zpadlen < 0)
	431	zpadlen = 0;
	432	if (spadlen < 0)
	433	spadlen = 0;
	434	if (flags & DP_F_ZERO) {
	435	zpadlen = MAX(zpadlen, spadlen);
	436	spadlen = 0;
	437	}
	438	if (flags & DP_F_MINUS)
	439	spadlen = -spadlen; /* Left Justifty */
	440
	441
	442	/* Spaces */
	443	while (spadlen > 0) {
	444	dopr_outch(buffer, currlen, maxlen, ' ');
	445	--spadlen;
	446	}
	447
	448	/* Sign */
	449	if (signvalue)
	450	dopr_outch(buffer, currlen, maxlen, signvalue);
	451
	452	/* Zeros */
	453	if (zpadlen > 0) {
	454	while (zpadlen > 0) {
	455	dopr_outch(buffer, currlen, maxlen, '0');
	456	--zpadlen;
	457	}
	458	}
	459
	460	/* Digits */
	461	while (place > 0)
	462	dopr_outch(buffer, currlen, maxlen, convert[--place]);
2d9a148e	463
f1312c76	464	/* Left Justified spaces */
	465	while (spadlen < 0) {
	466	dopr_outch (buffer, currlen, maxlen, ' ');
	467	++spadlen;
	468	}
b6019d68	469	}
b6019d68	470
f1312c76	471	static long double
f1312c76	472	pow10(int exp)
dad3b556	473	{
f1312c76	474	long double result = 1;
2d9a148e	475
f1312c76	476	while (exp) {
	477	result *= 10;
	478	exp--;
	479	}
2d9a148e	480
f1312c76	481	return result;
dad3b556	482	}
dad3b556	483
f1312c76	484	static long
f1312c76	485	round(long double value)
dad3b556	486	{
f1312c76	487	long intpart = value;
2d9a148e	488
f1312c76	489	value -= intpart;
	490	if (value >= 0.5)
	491	intpart++;
2d9a148e	492
f1312c76	493	return intpart;
dad3b556	494	}
dad3b556	495
f1312c76	496	static void
	497	fmtfp(char buffer, size_t currlen, size_t maxlen, long double fvalue,
	498	int min, int max, int flags)
dad3b556	499	{
f1312c76	500	char iconvert[20];
	501	char fconvert[20];
	502	int signvalue = 0;
	503	int iplace = 0;
	504	int fplace = 0;
	505	int padlen = 0; /* amount to pad */
	506	int zpadlen = 0;
	507	int caps = 0;
	508	long intpart;
	509	long fracpart;
	510	long double ufvalue;
2d9a148e	511
f1312c76	512	/*
	513	* AIX manpage says the default is 0, but Solaris says the default
	514	* is 6, and sprintf on AIX defaults to 6
	515	*/
	516	if (max < 0)
	517	max = 6;
	518
	519	ufvalue = abs_val(fvalue);
	520
	521	if (fvalue < 0)
	522	signvalue = '-';
	523	else if (flags & DP_F_PLUS) /* Do a sign (+/i) */
	524	signvalue = '+';
	525	else if (flags & DP_F_SPACE)
	526	signvalue = ' ';
	527
	528	intpart = ufvalue;
	529
	530	/*
	531	* Sorry, we only support 9 digits past the decimal because of our
	532	* conversion method
	533	*/
	534	if (max > 9)
	535	max = 9;
	536
	537	/* We "cheat" by converting the fractional part to integer by
	538	* multiplying by a factor of 10
	539	*/
	540	fracpart = round((pow10 (max)) * (ufvalue - intpart));
	541
	542	if (fracpart >= pow10 (max)) {
	543	intpart++;
	544	fracpart -= pow10 (max);
	545	}
	546
	547	/* Convert integer part */
	548	do {
	549	iconvert[iplace++] =
	550	(caps? "0123456789ABCDEF":"0123456789abcdef")[intpart % 10];
	551	intpart = (intpart / 10);
	552	} while(intpart && (iplace < 20));
	553	if (iplace == 20)
	554	iplace--;
	555	iconvert[iplace] = 0;
	556
	557	/* Convert fractional part */
	558	do {
	559	fconvert[fplace++] =
	560	(caps? "0123456789ABCDEF":"0123456789abcdef")[fracpart % 10];
	561	fracpart = (fracpart / 10);
	562	} while(fracpart && (fplace < 20));
	563	if (fplace == 20)
	564	fplace--;
	565	fconvert[fplace] = 0;
	566
	567	/* -1 for decimal point, another -1 if we are printing a sign */
	568	padlen = min - iplace - max - 1 - ((signvalue) ? 1 : 0);
	569	zpadlen = max - fplace;
	570	if (zpadlen < 0)
	571	zpadlen = 0;
	572	if (padlen < 0)
	573	padlen = 0;
	574	if (flags & DP_F_MINUS)
	575	padlen = -padlen; /* Left Justifty */
576
577	if ((flags & DP_F_ZERO) && (padlen > 0)) {
578	if (signvalue) {
579	dopr_outch(buffer, currlen, maxlen, signvalue);
580	--padlen;
581	signvalue = 0;
582	}
583	while (padlen > 0) {
584	dopr_outch(buffer, currlen, maxlen, '0');
585	--padlen;
586	}
587	}
588	while (padlen > 0) {
589	dopr_outch(buffer, currlen, maxlen, ' ');
590	--padlen;
591	}
592	if (signvalue)
593	dopr_outch(buffer, currlen, maxlen, signvalue);
594
595	while (iplace > 0)
596	dopr_outch(buffer, currlen, maxlen, iconvert[--iplace]);
597
598	/*
599	* Decimal point. This should probably use locale to find the correct
600	* char to print out.
601	*/
602	dopr_outch(buffer, currlen, maxlen, '.');
603
604	while (fplace > 0)
605	dopr_outch(buffer, currlen, maxlen, fconvert[--fplace]);
606
607	while (zpadlen > 0) {
608	dopr_outch(buffer, currlen, maxlen, '0');
609	--zpadlen;
610	}
611
612	while (padlen < 0) {
613	dopr_outch(buffer, currlen, maxlen, ' ');
614	++padlen;
615	}
2d9a148e	616	}
2d9a148e	617
f1312c76	618	static void
f1312c76	619	dopr_outch(char buffer, size_t currlen, size_t maxlen, char c)
2d9a148e	620	{
f1312c76	621	if (*currlen < maxlen)
f1312c76	622	buffer[(*currlen)++] = c;
dad3b556	623	}
2d9a148e	624	#endif /* !defined(HAVE_SNPRINTF) \|\| !defined(HAVE_VSNPRINTF) */
dad3b556	625
2d9a148e	626	#ifndef HAVE_VSNPRINTF
f1312c76	627	int
f1312c76	628	vsnprintf(char str, size_t count, const char fmt, va_list args)
dad3b556	629	{
f1312c76	630	str[0] = 0;
	631	dopr(str, count, fmt, args);
	632
	633	return(strlen(str));
dad3b556	634	}
2d9a148e	635	#endif /* !HAVE_VSNPRINTF */
dad3b556	636
2d9a148e	637	#ifndef HAVE_SNPRINTF
f1312c76	638	int
f1312c76	639	snprintf(char str,size_t count,const char fmt,...)
847e8865	640	{
f1312c76	641	va_list ap;
	642
	643	va_start(ap, fmt);
	644	(void) vsnprintf(str, count, fmt, ap);
	645	va_end(ap);
	646
	647	return(strlen(str));
2d9a148e	648	}
	649
	650	#ifdef TEST_SNPRINTF
f1312c76	651	int
f1312c76	652	main(void)
2d9a148e	653	{
f1312c76	654	#define LONG_STRING 1024
	655	char buf1[LONG_STRING];
	656	char buf2[LONG_STRING];
	657	char *fp_fmt[] = {
	658	"%-1.5f",
	659	"%1.5f",
	660	"%123.9f",
	661	"%10.5f",
	662	"% 10.5f",
	663	"%+22.9f",
	664	"%+4.9f",
	665	"%01.3f",
	666	"%4f",
	667	"%3.1f",
	668	"%3.2f",
	669	NULL
	670	};
	671	double fp_nums[] = {
	672	-1.5,
	673	134.21,
	674	91340.2,
	675	341.1234,
	676	0203.9,
	677	0.96,
	678	0.996,
	679	0.9996,
	680	1.996,
	681	4.136,
	682	0
	683	};
	684	char *int_fmt[] = {
	685	"%-1.5d",
	686	"%1.5d",
	687	"%123.9d",
	688	"%5.5d",
	689	"%10.5d",
	690	"% 10.5d",
	691	"%+22.33d",
	692	"%01.3d",
	693	"%4d",
	694	"%lld",
	695	"%qd",
	696	NULL
	697	};
	698	long long int_nums[] = { -1, 134, 91340, 341, 0203, 0, 9999999 };
	699	int x, y;
	700	int fail = 0;
	701	int num = 0;
	702
	703	printf("Testing snprintf format codes against system sprintf...\n");
	704
	705	for (x = 0; fp_fmt[x] != NULL ; x++) {
	706	for (y = 0; fp_nums[y] != 0 ; y++) {
	707	snprintf(buf1, sizeof (buf1), fp_fmt[x], fp_nums[y]);
	708	sprintf (buf2, fp_fmt[x], fp_nums[y]);
	709	if (strcmp (buf1, buf2)) {
	710	printf("snprintf doesn't match Format: %s\n\t"
	711	"snprintf = %s\n\tsprintf = %s\n",
	712	fp_fmt[x], buf1, buf2);
	713	fail++;
	714	}
	715	num++;
	716	}
	717	}
718	for (x = 0; int_fmt[x] != NULL ; x++) {
719	for (y = 0; int_nums[y] != 0 ; y++) {
720	snprintf(buf1, sizeof (buf1), int_fmt[x], int_nums[y]);
721	sprintf(buf2, int_fmt[x], int_nums[y]);
722	if (strcmp (buf1, buf2)) {
723	printf("snprintf doesn't match Format: %s\n\t"
724	"snprintf = %s\n\tsprintf = %s\n",
725	int_fmt[x], buf1, buf2);
726	fail++;
727	}
728	num++;
729	}
730	}
731	printf("%d tests failed out of %d.\n", fail, num);
732	return(0);
847e8865	733	}
2d9a148e	734	#endif /* SNPRINTF_TEST */
847e8865	735
2d9a148e	736	#endif /* !HAVE_SNPRINTF */