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snprintf.c

/*
 * Copyright Patrick Powell 1995
 * This code is based on code written by Patrick Powell (papowell@astart.com)
 * It may be used for any purpose as long as this notice remains intact
 * on all source code distributions
 */

/**************************************************************
 * 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.
 *
 *  Andrew Tridgell (tridge@samba.org) Oct 1998
 *    fixed handling of %.0f
 *    added test for HAVE_LONG_DOUBLE
 *
 * tridge@samba.org, idra@samba.org, April 2001
 *    got rid of fcvt code (twas buggy and made testing harder)
 *    added C99 semantics
 *
 **************************************************************/

#ifndef NO_CONFIG_H /* for some tests */
#include "config.h"
#else
#define NULL 0
#endif

#ifdef TEST_SNPRINTF /* need math library headers for testing */
#include <math.h>
#endif

#ifdef HAVE_STRING_H
#include <string.h>
#endif

#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#ifdef HAVE_CTYPE_H
#include <ctype.h>
#endif
#include <sys/types.h>
#include <stdarg.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif

#if defined(HAVE_SNPRINTF) && defined(HAVE_VSNPRINTF) && defined(HAVE_C99_VSNPRINTF)
/* only include stdio.h if we are not re-defining snprintf or vsnprintf */
#include <stdio.h>
 /* make the compiler happy with an empty file */
 void dummy_snprintf(void) {} 
#else

#ifdef HAVE_LONG_DOUBLE
#define LDOUBLE long double
#else
#define LDOUBLE double
#endif

#ifdef HAVE_LONG_LONG
#define LLONG long long
#else
#define LLONG long
#endif

/* free memory if the pointer is valid and zero the pointer */
#ifndef SAFE_FREE
#define SAFE_FREE(x) do { if ((x) != NULL) {free((char *)(x)); (x)=NULL;} } while(0)
#endif

#ifndef VA_COPY
#ifdef HAVE_VA_COPY
#define VA_COPY(dest, src) __va_copy(dest, src)
#else
#define VA_COPY(dest, src) (dest) = (src)
#endif
#endif

static size_t dopr(char *buffer, size_t maxlen, const char *format, 
               va_list args_in);
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,
               LDOUBLE 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_LLONG   4

#define char_to_int(p) ((p)- '0')
#ifndef MAX
#define MAX(p,q) (((p) >= (q)) ? (p) : (q))
#endif

static size_t dopr(char *buffer, size_t maxlen, const char *format, va_list args_in)
{
      char ch;
      LLONG value;
      LDOUBLE fvalue;
      char *strvalue;
      int min;
      int max;
      int state;
      int flags;
      int cflags;
      size_t currlen;
      va_list args;
      
      VA_COPY(args, args_in);

      state = DP_S_DEFAULT;
      currlen = flags = cflags = min = 0;
      max = -1;
      ch = *format++;
      
      while (state != DP_S_DONE) {
            if (ch == '\0') 
                  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') {  /* It's a long long */
                              cflags = DP_C_LLONG;
                              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_LLONG)
                              value = va_arg (args, LLONG);
                        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 = (long)va_arg (args, unsigned long int);
                        else if (cflags == DP_C_LLONG)
                              value = (long)va_arg (args, unsigned LLONG);
                        else
                              value = (long)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 = (long)va_arg (args, unsigned long int);
                        else if (cflags == DP_C_LLONG)
                              value = (LLONG)va_arg (args, unsigned LLONG);
                        else
                              value = (long)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 = (long)va_arg (args, unsigned long int);
                        else if (cflags == DP_C_LLONG)
                              value = (LLONG)va_arg (args, unsigned LLONG);
                        else
                              value = (long)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, LDOUBLE);
                        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, LDOUBLE);
                        else
                              fvalue = va_arg (args, double);
                        fmtfp (buffer, &currlen, maxlen, fvalue, min, max, flags);
                        break;
                  case 'G':
                        flags |= DP_F_UP;
                  case 'g':
                        if (cflags == DP_C_LDOUBLE)
                              fvalue = va_arg (args, LDOUBLE);
                        else
                              fvalue = va_arg (args, double);
                        fmtfp (buffer, &currlen, maxlen, fvalue, min, max, flags);
                        break;
                  case 'c':
                        dopr_outch (buffer, &currlen, maxlen, va_arg (args, int));
                        break;
                  case 's':
                        strvalue = va_arg (args, char *);
                        if (!strvalue) strvalue = "(NULL)";
                        if (max == -1) {
                              max = strlen(strvalue);
                        }
                        if (min > 0 && max >= 0 && min > max) max = min;
                        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 = (long int)currlen;
                        } else if (cflags == DP_C_LLONG) {
                              LLONG *num;
                              num = va_arg (args, LLONG *);
                              *num = (LLONG)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 (maxlen != 0) {
            if (currlen < maxlen - 1) 
                  buffer[currlen] = '\0';
            else if (maxlen > 0) 
                  buffer[maxlen - 1] = '\0';
      }
      
      return currlen;
}

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;

#ifdef DEBUG_SNPRINTF
      printf("fmtstr min=%d max=%d s=[%s]\n", min, max, value);
#endif
      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)
{
      int signvalue = 0;
      unsigned long uvalue;
      char convert[20];
      int place = 0;
      int spadlen = 0; /* amount to space pad */
      int zpadlen = 0; /* amount to zero pad */
      int caps = 0;
      
      if (max < 0)
            max = 0;
      
      uvalue = value;
      
      if(!(flags & DP_F_UNSIGNED)) {
            if( value < 0 ) {
                  signvalue = '-';
                  uvalue = -value;
            } else {
                  if (flags & DP_F_PLUS)  /* Do a sign (+/i) */
                        signvalue = '+';
                  else if (flags & DP_F_SPACE)
                        signvalue = ' ';
            }
      }
  
      if (flags & DP_F_UP) caps = 1; /* Should characters be upper case? */

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

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

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

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

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

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

      /* Digits */
      while (place > 0) 
            dopr_outch (buffer, currlen, maxlen, convert[--place]);
  
      /* Left Justified spaces */
      while (spadlen < 0) {
            dopr_outch (buffer, currlen, maxlen, ' ');
            ++spadlen;
      }
}

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

      if (value < 0)
            result = -value;
      
      return result;
}

static LDOUBLE POW10(int exp)
{
      LDOUBLE result = 1;
      
      while (exp) {
            result *= 10;
            exp--;
      }
  
      return result;
}

static LLONG ROUND(LDOUBLE value)
{
      LLONG intpart;

      intpart = (LLONG)value;
      value = value - intpart;
      if (value >= 0.5) intpart++;
      
      return intpart;
}

/* a replacement for modf that doesn't need the math library. Should
   be portable, but slow */
static double my_modf(double x0, double *iptr)
{
      int i;
      long l;
      double x = x0;
      double f = 1.0;

      for (i=0;i<100;i++) {
            l = (long)x;
            if (l <= (x+1) && l >= (x-1)) break;
            x *= 0.1;
            f *= 10.0;
      }

      if (i == 100) {
            /* yikes! the number is beyond what we can handle. What do we do? */
            (*iptr) = 0;
            return 0;
      }

      if (i != 0) {
            double i2;
            double ret;

            ret = my_modf(x0-l*f, &i2);
            (*iptr) = l*f + i2;
            return ret;
      } 

      (*iptr) = l;
      return x - (*iptr);
}


static void fmtfp (char *buffer, size_t *currlen, size_t maxlen,
               LDOUBLE fvalue, int min, int max, int flags)
{
      int signvalue = 0;
      double ufvalue;
      char iconvert[311];
      char fconvert[311];
      int iplace = 0;
      int fplace = 0;
      int padlen = 0; /* amount to pad */
      int zpadlen = 0; 
      int caps = 0;
      int index;
      double intpart;
      double fracpart;
      double temp;
  
      /* 
       * AIX manpage says the default is 0, but Solaris says the default
       * is 6, and sprintf on AIX defaults to 6
       */
      if (max < 0)
            max = 6;

      ufvalue = abs_val (fvalue);

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

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

#if 0
       if (max == 0) ufvalue += 0.5; /* if max = 0 we must round */
#endif

      /* 
       * Sorry, we only support 16 digits past the decimal because of our 
       * conversion method
       */
      if (max > 16)
            max = 16;

      /* We "cheat" by converting the fractional part to integer by
       * multiplying by a factor of 10
       */

      temp = ufvalue;
      my_modf(temp, &intpart);

      fracpart = ROUND((POW10(max)) * (ufvalue - intpart));
      
      if (fracpart >= POW10(max)) {
            intpart++;
            fracpart -= POW10(max);
      }


      /* Convert integer part */
      do {
            temp = intpart*0.1;
            my_modf(temp, &intpart);
            index = (int) ((temp -intpart +0.05)* 10.0);
            /* index = (int) (((double)(temp*0.1) -intpart +0.05) *10.0); */
            /* printf ("%llf, %f, %x\n", temp, intpart, index); */
            iconvert[iplace++] =
                  (caps? "0123456789ABCDEF":"0123456789abcdef")[index];
      } while (intpart && (iplace < 311));
      if (iplace == 311) iplace--;
      iconvert[iplace] = 0;

      /* Convert fractional part */
      if (fracpart)
      {
            do {
                  temp = fracpart*0.1;
                  my_modf(temp, &fracpart);
                  index = (int) ((temp -fracpart +0.05)* 10.0);
                  /* index = (int) ((((temp/10) -fracpart) +0.05) *10); */
                  /* printf ("%lf, %lf, %ld\n", temp, fracpart, index); */
                  fconvert[fplace++] =
                  (caps? "0123456789ABCDEF":"0123456789abcdef")[index];
            } while(fracpart && (fplace < 311));
            if (fplace == 311) 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]);

#ifdef DEBUG_SNPRINTF
      printf("fmtfp: fplace=%d zpadlen=%d\n", fplace, zpadlen);
#endif

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

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

      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;
      }
      (*currlen)++;
}

/* yes this really must be a ||. Don't muck with this (tridge) */
#if !defined(HAVE_VSNPRINTF) || !defined(HAVE_C99_VSNPRINTF)
 int vsnprintf (char *str, size_t count, const char *fmt, va_list args)
{
      return dopr(str, count, fmt, args);
}
#endif

/* yes this really must be a ||. Don't muck wiith this (tridge)
 *
 * The logic for these two is that we need our own definition if the
 * OS *either* has no definition of *sprintf, or if it does have one
 * that doesn't work properly according to the autoconf test.  Perhaps
 * these should really be smb_snprintf to avoid conflicts with buggy
 * linkers? -- mbp
 */
#if !defined(HAVE_SNPRINTF) || !defined(HAVE_C99_SNPRINTF)
 int snprintf(char *str,size_t count,const char *fmt,...)
{
      size_t ret;
      va_list ap;
    
      va_start(ap, fmt);
      ret = vsnprintf(str, count, fmt, ap);
      va_end(ap);
      return ret;
}
#endif

#endif 

#ifndef HAVE_VASPRINTF
 int vasprintf(char **ptr, const char *format, va_list ap)
{
      int ret;
      va_list ap2;
      
      VA_COPY(ap2, ap);
      ret = vsnprintf(NULL, 0, format, ap2);
      if (ret <= 0) return ret;

      (*ptr) = (char *)malloc(ret+1);
      if (!*ptr) return -1;
      VA_COPY(ap2, ap);
      ret = vsnprintf(*ptr, ret+1, format, ap2);

      return ret;
}
#endif


#ifndef HAVE_ASPRINTF
 int asprintf(char **ptr, const char *format, ...)
{
      va_list ap;
      int ret;
      
      *ptr = NULL;
      va_start(ap, format);
      ret = vasprintf(ptr, format, ap);
      va_end(ap);

      return ret;
}
#endif

#ifndef HAVE_VSYSLOG
#ifdef HAVE_SYSLOG
 void vsyslog (int facility_priority, char *format, va_list arglist)
{
      char *msg = NULL;
      vasprintf(&msg, format, arglist);
      if (!msg)
            return;
      syslog(facility_priority, "%s", msg);
      SAFE_FREE(msg);
}
#endif /* HAVE_SYSLOG */
#endif /* HAVE_VSYSLOG */

#ifdef TEST_SNPRINTF

 int sprintf(char *str,const char *fmt,...);

 int main (void)
{
      char buf1[1024];
      char buf2[1024];
      char *fp_fmt[] = {
            "%1.1f",
            "%-1.5f",
            "%1.5f",
            "%123.9f",
            "%10.5f",
            "% 10.5f",
            "%+22.9f",
            "%+4.9f",
            "%01.3f",
            "%4f",
            "%3.1f",
            "%3.2f",
            "%.0f",
            "%f",
            "-16.16f",
            NULL
      };
      double fp_nums[] = { 6442452944.1234, -1.5, 134.21, 91340.2, 341.1234, 0203.9, 0.96, 0.996, 
                       0.9996, 1.996, 4.136, 5.030201, 0};
      char *int_fmt[] = {
            "%-1.5d",
            "%1.5d",
            "%123.9d",
            "%5.5d",
            "%10.5d",
            "% 10.5d",
            "%+22.33d",
            "%01.3d",
            "%4d",
            "%d",
            NULL
      };
      long int_nums[] = { -1, 134, 91340, 341, 0203, 0};
      char *str_fmt[] = {
            "10.5s",
            "5.10s",
            "10.1s",
            "0.10s",
            "10.0s",
            "1.10s",
            "%s",
            "%.1s",
            "%.10s",
            "%10s",
            NULL
      };
      char *str_vals[] = {"hello", "a", "", "a longer string", NULL};
      int x, y;
      int fail = 0;
      int num = 0;

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

      for (x = 0; fp_fmt[x] ; x++) {
            for (y = 0; fp_nums[y] != 0 ; y++) {
                  int l1 = snprintf(NULL, 0, fp_fmt[x], fp_nums[y]);
                  int l2 = snprintf(buf1, sizeof(buf1), fp_fmt[x], fp_nums[y]);
                  sprintf (buf2, fp_fmt[x], fp_nums[y]);
                  if (strcmp (buf1, buf2)) {
                        printf("snprintf doesn't match Format: %s\n\tsnprintf = [%s]\n\t sprintf = [%s]\n", 
                               fp_fmt[x], buf1, buf2);
                        fail++;
                  }
                  if (l1 != l2) {
                        printf("snprintf l1 != l2 (%d %d) %s\n", l1, l2, fp_fmt[x]);
                        fail++;
                  }
                  num++;
            }
      }

      for (x = 0; int_fmt[x] ; x++) {
            for (y = 0; int_nums[y] != 0 ; y++) {
                  int l1 = snprintf(NULL, 0, int_fmt[x], int_nums[y]);
                  int l2 = snprintf(buf1, sizeof(buf1), int_fmt[x], int_nums[y]);
                  sprintf (buf2, int_fmt[x], int_nums[y]);
                  if (strcmp (buf1, buf2)) {
                        printf("snprintf doesn't match Format: %s\n\tsnprintf = [%s]\n\t sprintf = [%s]\n", 
                               int_fmt[x], buf1, buf2);
                        fail++;
                  }
                  if (l1 != l2) {
                        printf("snprintf l1 != l2 (%d %d) %s\n", l1, l2, int_fmt[x]);
                        fail++;
                  }
                  num++;
            }
      }

      for (x = 0; str_fmt[x] ; x++) {
            for (y = 0; str_vals[y] != 0 ; y++) {
                  int l1 = snprintf(NULL, 0, str_fmt[x], str_vals[y]);
                  int l2 = snprintf(buf1, sizeof(buf1), str_fmt[x], str_vals[y]);
                  sprintf (buf2, str_fmt[x], str_vals[y]);
                  if (strcmp (buf1, buf2)) {
                        printf("snprintf doesn't match Format: %s\n\tsnprintf = [%s]\n\t sprintf = [%s]\n", 
                               str_fmt[x], buf1, buf2);
                        fail++;
                  }
                  if (l1 != l2) {
                        printf("snprintf l1 != l2 (%d %d) %s\n", l1, l2, str_fmt[x]);
                        fail++;
                  }
                  num++;
            }
      }

      printf ("%d tests failed out of %d.\n", fail, num);

      printf("seeing how many digits we support\n");
      {
            double v0 = 0.12345678901234567890123456789012345678901;
            for (x=0; x<100; x++) {
                  double p = pow(10, x); 
                  double r = v0*p;
                  snprintf(buf1, sizeof(buf1), "%1.1f", r);
                  sprintf(buf2,                "%1.1f", r);
                  if (strcmp(buf1, buf2)) {
                        printf("we seem to support %d digits\n", x-1);
                        break;
                  }
            }
      }

      return 0;
}
#endif /* SNPRINTF_TEST */

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