[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);

static void
dopr_outch(char *buffer, size_t *currlen, size_t maxlen, char c);

/*
 * 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
958e5ae4	73	static void
	74	dopr_outch(char buffer, size_t currlen, size_t maxlen, char c);
	75
2d9a148e	76	/*
	77	* dopr(): poor man's version of doprintf
	78	*/
	79
	80	/* format read states */
	81	#define DP_S_DEFAULT 0
	82	#define DP_S_FLAGS 1
	83	#define DP_S_MIN 2
	84	#define DP_S_DOT 3
	85	#define DP_S_MAX 4
	86	#define DP_S_MOD 5
	87	#define DP_S_CONV 6
	88	#define DP_S_DONE 7
	89
	90	/* format flags - Bits */
	91	#define DP_F_MINUS (1 << 0)
	92	#define DP_F_PLUS (1 << 1)
	93	#define DP_F_SPACE (1 << 2)
	94	#define DP_F_NUM (1 << 3)
	95	#define DP_F_ZERO (1 << 4)
	96	#define DP_F_UP (1 << 5)
	97	#define DP_F_UNSIGNED (1 << 6)
	98
	99	/* Conversion Flags */
c73b8e3a	100	#define DP_C_SHORT 1
	101	#define DP_C_LONG 2
	102	#define DP_C_LDOUBLE 3
	103	#define DP_C_LONG_LONG 4
2d9a148e	104
2d9a148e	105	#define char_to_int(p) (p - '0')
f1312c76	106	#define abs_val(p) (p < 0 ? -p : p)
2d9a148e	107
f1312c76	108
	109	static void
	110	dopr(char buffer, size_t maxlen, const char format, va_list args)
2d9a148e	111	{
f1312c76	112	char *strvalue;
	113	char ch;
	114	long value;
	115	long double fvalue;
	116	int min = 0;
	117	int max = -1;
	118	int state = DP_S_DEFAULT;
	119	int flags = 0;
	120	int cflags = 0;
	121	size_t currlen = 0;
2d9a148e	122
2d9a148e	123	ch = *format++;
f1312c76	124
	125	while (state != DP_S_DONE) {
	126	if ((ch == '\0') \|\| (currlen >= maxlen))
	127	state = DP_S_DONE;
	128
	129	switch(state) {
	130	case DP_S_DEFAULT:
	131	if (ch == '%')
	132	state = DP_S_FLAGS;
	133	else
	134	dopr_outch(buffer, &currlen, maxlen, ch);
	135	ch = *format++;
	136	break;
	137	case DP_S_FLAGS:
	138	switch (ch) {
	139	case '-':
	140	flags \|= DP_F_MINUS;
	141	ch = *format++;
	142	break;
	143	case '+':
	144	flags \|= DP_F_PLUS;
	145	ch = *format++;
	146	break;
	147	case ' ':
	148	flags \|= DP_F_SPACE;
	149	ch = *format++;
	150	break;
	151	case '#':
	152	flags \|= DP_F_NUM;
	153	ch = *format++;
	154	break;
	155	case '0':
	156	flags \|= DP_F_ZERO;
	157	ch = *format++;
	158	break;
	159	default:
	160	state = DP_S_MIN;
	161	break;
	162	}
	163	break;
	164	case DP_S_MIN:
	165	if (isdigit((unsigned char)ch)) {
	166	min = 10*min + char_to_int (ch);
	167	ch = *format++;
	168	} else if (ch == '*') {
	169	min = va_arg (args, int);
	170	ch = *format++;
	171	state = DP_S_DOT;
	172	} else
	173	state = DP_S_DOT;
	174	break;
	175	case DP_S_DOT:
	176	if (ch == '.') {
	177	state = DP_S_MAX;
	178	ch = *format++;
	179	} else
	180	state = DP_S_MOD;
	181	break;
	182	case DP_S_MAX:
	183	if (isdigit((unsigned char)ch)) {
	184	if (max < 0)
	185	max = 0;
	186	max = 10*max + char_to_int(ch);
	187	ch = *format++;
188	} else if (ch == '*') {
189	max = va_arg (args, int);
190	ch = *format++;
191	state = DP_S_MOD;
192	} else
193	state = DP_S_MOD;
194	break;
195	case DP_S_MOD:
196	switch (ch) {
197	case 'h':
198	cflags = DP_C_SHORT;
199	ch = *format++;
200	break;
201	case 'l':
202	cflags = DP_C_LONG;
203	ch = *format++;
204	if (ch == 'l') {
205	cflags = DP_C_LONG_LONG;
206	ch = *format++;
207	}
208	break;
209	case 'q':
210	cflags = DP_C_LONG_LONG;
211	ch = *format++;
212	break;
213	case 'L':
214	cflags = DP_C_LDOUBLE;
215	ch = *format++;
216	break;
217	default:
218	break;
219	}
220	state = DP_S_CONV;
221	break;
222	case DP_S_CONV:
223	switch (ch) {
224	case 'd':
225	case 'i':
226	if (cflags == DP_C_SHORT)
227	value = va_arg(args, int);
228	else if (cflags == DP_C_LONG)
229	value = va_arg(args, long int);
230	else if (cflags == DP_C_LONG_LONG)
231	value = va_arg (args, long long);
232	else
233	value = va_arg (args, int);
234	fmtint(buffer, &currlen, maxlen, value, 10, min, max, flags);
235	break;
236	case 'o':
237	flags \|= DP_F_UNSIGNED;
238	if (cflags == DP_C_SHORT)
239	value = va_arg(args, unsigned int);
240	else if (cflags == DP_C_LONG)
241	value = va_arg(args, unsigned long int);
242	else if (cflags == DP_C_LONG_LONG)
243	value = va_arg(args, unsigned long long);
244	else
245	value = va_arg(args, unsigned int);
246	fmtint(buffer, &currlen, maxlen, value, 8, min, max, flags);
247	break;
248	case 'u':
249	flags \|= DP_F_UNSIGNED;
250	if (cflags == DP_C_SHORT)
251	value = va_arg(args, unsigned int);
252	else if (cflags == DP_C_LONG)
253	value = va_arg(args, unsigned long int);
254	else if (cflags == DP_C_LONG_LONG)
255	value = va_arg(args, unsigned long long);
256	else
257	value = va_arg(args, unsigned int);
258	fmtint (buffer, &currlen, maxlen, value, 10, min, max, flags);
259	break;
260	case 'X':
261	flags \|= DP_F_UP;
262	case 'x':
263	flags \|= DP_F_UNSIGNED;
264	if (cflags == DP_C_SHORT)
265	value = va_arg(args, unsigned int);
266	else if (cflags == DP_C_LONG)
267	value = va_arg(args, unsigned long int);
268	else if (cflags == DP_C_LONG_LONG)
269	value = va_arg(args, unsigned long long);
270	else
271	value = va_arg(args, unsigned int);
272	fmtint(buffer, &currlen, maxlen, value, 16, min, max, flags);
273	break;
274	case 'f':
275	if (cflags == DP_C_LDOUBLE)
276	fvalue = va_arg(args, long double);
277	else
278	fvalue = va_arg(args, double);
279	/* um, floating point? */
280	fmtfp(buffer, &currlen, maxlen, fvalue, min, max, flags);
281	break;
282	case 'E':
283	flags \|= DP_F_UP;
284	case 'e':
285	if (cflags == DP_C_LDOUBLE)
286	fvalue = va_arg(args, long double);
287	else
288	fvalue = va_arg(args, double);
289	break;
290	case 'G':
291	flags \|= DP_F_UP;
292	case 'g':
293	if (cflags == DP_C_LDOUBLE)
294	fvalue = va_arg(args, long double);
295	else
296	fvalue = va_arg(args, double);
297	break;
298	case 'c':
299	dopr_outch(buffer, &currlen, maxlen, va_arg(args, int));
300	break;
301	case 's':
302	strvalue = va_arg(args, char *);
303	if (max < 0)
304	max = maxlen; /* ie, no max */
305	fmtstr(buffer, &currlen, maxlen, strvalue, flags, min, max);
306	break;
307	case 'p':
308	strvalue = va_arg(args, void *);
309	fmtint(buffer, &currlen, maxlen, (long) strvalue, 16, min, max, flags);
310	break;
311	case 'n':
312	if (cflags == DP_C_SHORT) {
313	short int *num;
314	num = va_arg(args, short int *);
315	*num = currlen;
316	} else if (cflags == DP_C_LONG) {
317	long int *num;
318	num = va_arg(args, long int *);
319	*num = currlen;
320	} else if (cflags == DP_C_LONG_LONG) {
321	long long *num;
322	num = va_arg(args, long long *);
323	*num = currlen;
324	} else {
325	int *num;
326	num = va_arg(args, int *);
327	*num = currlen;
328	}
329	break;
330	case '%':
331	dopr_outch(buffer, &currlen, maxlen, ch);
332	break;
333	case 'w': /* not supported yet, treat as next char */
334	ch = *format++;
335	break;
336	default: /* Unknown, skip */
337	break;
338	}
339	ch = *format++;
340	state = DP_S_DEFAULT;
341	flags = cflags = min = 0;
342	max = -1;
343	break;
344	case DP_S_DONE:
345	break;
346	default: /* hmm? */
347	break; /* some picky compilers need this */
348	}
349	}
350	if (currlen < maxlen - 1)
351	buffer[currlen] = '\0';
2d9a148e	352	else
f1312c76	353	buffer[maxlen - 1] = '\0';
2d9a148e	354	}
2d9a148e	355
f1312c76	356	static void
	357	fmtstr(char buffer, size_t currlen, size_t maxlen,
	358	char *value, int flags, int min, int max)
2d9a148e	359	{
f1312c76	360	int padlen, strln; /* amount to pad */
f1312c76	361	int cnt = 0;
2d9a148e	362
f1312c76	363	if (value == 0)
	364	value = "<NULL>";
	365
	366	for (strln = 0; value[strln]; ++strln); /* strlen */
	367	padlen = min - strln;
	368	if (padlen < 0)
	369	padlen = 0;
	370	if (flags & DP_F_MINUS)
	371	padlen = -padlen; /* Left Justify */
	372
	373	while ((padlen > 0) && (cnt < max)) {
	374	dopr_outch(buffer, currlen, maxlen, ' ');
	375	--padlen;
	376	++cnt;
	377	}
	378	while (*value && (cnt < max)) {
	379	dopr_outch(buffer, currlen, maxlen, *value++);
	380	++cnt;
	381	}
	382	while ((padlen < 0) && (cnt < max)) {
	383	dopr_outch(buffer, currlen, maxlen, ' ');
	384	++padlen;
	385	++cnt;
	386	}
2d9a148e	387	}
	388
	389	/* Have to handle DP_F_NUM (ie 0x and 0 alternates) */
	390
f1312c76	391	static void
	392	fmtint(char buffer, size_t currlen, size_t maxlen,
	393	long value, int base, int min, int max, int flags)
2d9a148e	394	{
f1312c76	395	unsigned long uvalue;
	396	char convert[20];
	397	int signvalue = 0;
	398	int place = 0;
	399	int spadlen = 0; /* amount to space pad */
	400	int zpadlen = 0; /* amount to zero pad */
	401	int caps = 0;
2d9a148e	402
f1312c76	403	if (max < 0)
	404	max = 0;
	405
	406	uvalue = value;
	407
	408	if (!(flags & DP_F_UNSIGNED)) {
	409	if (value < 0) {
	410	signvalue = '-';
	411	uvalue = -value;
	412	} else if (flags & DP_F_PLUS) /* Do a sign (+/i) */
	413	signvalue = '+';
	414	else if (flags & DP_F_SPACE)
	415	signvalue = ' ';
	416	}
2d9a148e	417
f1312c76	418	if (flags & DP_F_UP)
	419	caps = 1; /* Should characters be upper case? */
	420
	421	do {
	422	convert[place++] =
	423	(caps? "0123456789ABCDEF":"0123456789abcdef")
	424	[uvalue % (unsigned)base];
	425	uvalue = (uvalue / (unsigned)base );
	426	} while (uvalue && (place < 20));
	427	if (place == 20)
	428	place--;
	429	convert[place] = 0;
	430
	431	zpadlen = max - place;
	432	spadlen = min - MAX (max, place) - (signvalue ? 1 : 0);
	433	if (zpadlen < 0)
	434	zpadlen = 0;
	435	if (spadlen < 0)
	436	spadlen = 0;
	437	if (flags & DP_F_ZERO) {
	438	zpadlen = MAX(zpadlen, spadlen);
	439	spadlen = 0;
	440	}
	441	if (flags & DP_F_MINUS)
	442	spadlen = -spadlen; /* Left Justifty */
	443
	444
	445	/* Spaces */
	446	while (spadlen > 0) {
	447	dopr_outch(buffer, currlen, maxlen, ' ');
	448	--spadlen;
	449	}
	450
	451	/* Sign */
	452	if (signvalue)
	453	dopr_outch(buffer, currlen, maxlen, signvalue);
	454
	455	/* Zeros */
	456	if (zpadlen > 0) {
	457	while (zpadlen > 0) {
	458	dopr_outch(buffer, currlen, maxlen, '0');
	459	--zpadlen;
	460	}
	461	}
	462
	463	/* Digits */
	464	while (place > 0)
	465	dopr_outch(buffer, currlen, maxlen, convert[--place]);
2d9a148e	466
f1312c76	467	/* Left Justified spaces */
	468	while (spadlen < 0) {
	469	dopr_outch (buffer, currlen, maxlen, ' ');
	470	++spadlen;
	471	}
b6019d68	472	}
b6019d68	473
f1312c76	474	static long double
f1312c76	475	pow10(int exp)
dad3b556	476	{
f1312c76	477	long double result = 1;
2d9a148e	478
f1312c76	479	while (exp) {
	480	result *= 10;
	481	exp--;
	482	}
2d9a148e	483
f1312c76	484	return result;
dad3b556	485	}
dad3b556	486
f1312c76	487	static long
f1312c76	488	round(long double value)
dad3b556	489	{
f1312c76	490	long intpart = value;
2d9a148e	491
f1312c76	492	value -= intpart;
	493	if (value >= 0.5)
	494	intpart++;
2d9a148e	495
f1312c76	496	return intpart;
dad3b556	497	}
dad3b556	498
f1312c76	499	static void
	500	fmtfp(char buffer, size_t currlen, size_t maxlen, long double fvalue,
	501	int min, int max, int flags)
dad3b556	502	{
f1312c76	503	char iconvert[20];
	504	char fconvert[20];
	505	int signvalue = 0;
	506	int iplace = 0;
	507	int fplace = 0;
	508	int padlen = 0; /* amount to pad */
	509	int zpadlen = 0;
	510	int caps = 0;
	511	long intpart;
	512	long fracpart;
	513	long double ufvalue;
2d9a148e	514
f1312c76	515	/*
	516	* AIX manpage says the default is 0, but Solaris says the default
	517	* is 6, and sprintf on AIX defaults to 6
	518	*/
	519	if (max < 0)
	520	max = 6;
	521
	522	ufvalue = abs_val(fvalue);
	523
	524	if (fvalue < 0)
	525	signvalue = '-';
	526	else if (flags & DP_F_PLUS) /* Do a sign (+/i) */
	527	signvalue = '+';
	528	else if (flags & DP_F_SPACE)
	529	signvalue = ' ';
	530
	531	intpart = ufvalue;
	532
	533	/*
	534	* Sorry, we only support 9 digits past the decimal because of our
	535	* conversion method
	536	*/
	537	if (max > 9)
	538	max = 9;
	539
	540	/* We "cheat" by converting the fractional part to integer by
	541	* multiplying by a factor of 10
	542	*/
	543	fracpart = round((pow10 (max)) * (ufvalue - intpart));
	544
	545	if (fracpart >= pow10 (max)) {
	546	intpart++;
	547	fracpart -= pow10 (max);
	548	}
	549
	550	/* Convert integer part */
	551	do {
	552	iconvert[iplace++] =
	553	(caps? "0123456789ABCDEF":"0123456789abcdef")[intpart % 10];
	554	intpart = (intpart / 10);
	555	} while(intpart && (iplace < 20));
	556	if (iplace == 20)
	557	iplace--;
	558	iconvert[iplace] = 0;
	559
	560	/* Convert fractional part */
	561	do {
	562	fconvert[fplace++] =
	563	(caps? "0123456789ABCDEF":"0123456789abcdef")[fracpart % 10];
	564	fracpart = (fracpart / 10);
	565	} while(fracpart && (fplace < 20));
	566	if (fplace == 20)
	567	fplace--;
	568	fconvert[fplace] = 0;
	569
	570	/* -1 for decimal point, another -1 if we are printing a sign */
	571	padlen = min - iplace - max - 1 - ((signvalue) ? 1 : 0);
	572	zpadlen = max - fplace;
	573	if (zpadlen < 0)
	574	zpadlen = 0;
	575	if (padlen < 0)
	576	padlen = 0;
	577	if (flags & DP_F_MINUS)
	578	padlen = -padlen; /* Left Justifty */
579
580	if ((flags & DP_F_ZERO) && (padlen > 0)) {
581	if (signvalue) {
582	dopr_outch(buffer, currlen, maxlen, signvalue);
583	--padlen;
584	signvalue = 0;
585	}
586	while (padlen > 0) {
587	dopr_outch(buffer, currlen, maxlen, '0');
588	--padlen;
589	}
590	}
591	while (padlen > 0) {
592	dopr_outch(buffer, currlen, maxlen, ' ');
593	--padlen;
594	}
595	if (signvalue)
596	dopr_outch(buffer, currlen, maxlen, signvalue);
597
598	while (iplace > 0)
599	dopr_outch(buffer, currlen, maxlen, iconvert[--iplace]);
600
601	/*
602	* Decimal point. This should probably use locale to find the correct
603	* char to print out.
604	*/
605	dopr_outch(buffer, currlen, maxlen, '.');
606
607	while (fplace > 0)
608	dopr_outch(buffer, currlen, maxlen, fconvert[--fplace]);
609
610	while (zpadlen > 0) {
611	dopr_outch(buffer, currlen, maxlen, '0');
612	--zpadlen;
613	}
614
615	while (padlen < 0) {
616	dopr_outch(buffer, currlen, maxlen, ' ');
617	++padlen;
618	}
2d9a148e	619	}
2d9a148e	620
f1312c76	621	static void
f1312c76	622	dopr_outch(char buffer, size_t currlen, size_t maxlen, char c)
2d9a148e	623	{
f1312c76	624	if (*currlen < maxlen)
f1312c76	625	buffer[(*currlen)++] = c;
dad3b556	626	}
2d9a148e	627	#endif /* !defined(HAVE_SNPRINTF) \|\| !defined(HAVE_VSNPRINTF) */
dad3b556	628
2d9a148e	629	#ifndef HAVE_VSNPRINTF
f1312c76	630	int
f1312c76	631	vsnprintf(char str, size_t count, const char fmt, va_list args)
dad3b556	632	{
f1312c76	633	str[0] = 0;
	634	dopr(str, count, fmt, args);
	635
	636	return(strlen(str));
dad3b556	637	}
2d9a148e	638	#endif /* !HAVE_VSNPRINTF */
dad3b556	639
2d9a148e	640	#ifndef HAVE_SNPRINTF
f1312c76	641	int
f1312c76	642	snprintf(char str,size_t count,const char fmt,...)
847e8865	643	{
f1312c76	644	va_list ap;
	645
	646	va_start(ap, fmt);
	647	(void) vsnprintf(str, count, fmt, ap);
	648	va_end(ap);
	649
	650	return(strlen(str));
2d9a148e	651	}
	652
	653	#ifdef TEST_SNPRINTF
f1312c76	654	int
f1312c76	655	main(void)
2d9a148e	656	{
f1312c76	657	#define LONG_STRING 1024
	658	char buf1[LONG_STRING];
	659	char buf2[LONG_STRING];
	660	char *fp_fmt[] = {
	661	"%-1.5f",
	662	"%1.5f",
	663	"%123.9f",
	664	"%10.5f",
	665	"% 10.5f",
	666	"%+22.9f",
	667	"%+4.9f",
	668	"%01.3f",
	669	"%4f",
	670	"%3.1f",
	671	"%3.2f",
	672	NULL
	673	};
	674	double fp_nums[] = {
	675	-1.5,
	676	134.21,
	677	91340.2,
	678	341.1234,
	679	0203.9,
	680	0.96,
	681	0.996,
	682	0.9996,
	683	1.996,
	684	4.136,
	685	0
	686	};
	687	char *int_fmt[] = {
	688	"%-1.5d",
	689	"%1.5d",
	690	"%123.9d",
	691	"%5.5d",
	692	"%10.5d",
	693	"% 10.5d",
	694	"%+22.33d",
	695	"%01.3d",
	696	"%4d",
	697	"%lld",
	698	"%qd",
	699	NULL
	700	};
	701	long long int_nums[] = { -1, 134, 91340, 341, 0203, 0, 9999999 };
	702	int x, y;
	703	int fail = 0;
	704	int num = 0;
	705
	706	printf("Testing snprintf format codes against system sprintf...\n");
	707
	708	for (x = 0; fp_fmt[x] != NULL ; x++) {
	709	for (y = 0; fp_nums[y] != 0 ; y++) {
	710	snprintf(buf1, sizeof (buf1), fp_fmt[x], fp_nums[y]);
	711	sprintf (buf2, fp_fmt[x], fp_nums[y]);
	712	if (strcmp (buf1, buf2)) {
	713	printf("snprintf doesn't match Format: %s\n\t"
	714	"snprintf = %s\n\tsprintf = %s\n",
	715	fp_fmt[x], buf1, buf2);
	716	fail++;
	717	}
	718	num++;
	719	}
	720	}
721	for (x = 0; int_fmt[x] != NULL ; x++) {
722	for (y = 0; int_nums[y] != 0 ; y++) {
723	snprintf(buf1, sizeof (buf1), int_fmt[x], int_nums[y]);
724	sprintf(buf2, int_fmt[x], int_nums[y]);
725	if (strcmp (buf1, buf2)) {
726	printf("snprintf doesn't match Format: %s\n\t"
727	"snprintf = %s\n\tsprintf = %s\n",
728	int_fmt[x], buf1, buf2);
729	fail++;
730	}
731	num++;
732	}
733	}
734	printf("%d tests failed out of %d.\n", fail, num);
735	return(0);
847e8865	736	}
2d9a148e	737	#endif /* SNPRINTF_TEST */
847e8865	738
2d9a148e	739	#endif /* !HAVE_SNPRINTF */