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misc.c

/*
 * $Id: misc.c,v 1.19 2005/08/11 07:32:35 jheinonen Exp $
 *
 * by JH <jheinonen@users.sourceforge.net>
 *
 * Copyright (C) Jaakko Heinonen
 * getaline() Copyright (C) Lars Wirzenius
 * sprintf and snprintf copyright is owned by various people
 */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include <unistd.h>
#include <errno.h>
#ifdef HAVE_CONFIG_H
#     include "config.h"
#endif
#ifdef HANDLE_MULTIBYTE
#     include <mbswidth.h>
#endif
#include "misc.h"
#include "xmalloc.h"

#ifndef DEBUG
#     define NDEBUG     1
#else
#     undef NDEBUG
#endif

#include <assert.h>

char *
strlower(char *str)
{
      char *tmp = str;

      assert(str != NULL);

      while( ( *str = tolower ( *str ) ) )
            str++;

      return tmp;
}

char *
strtrim(char *s)
{
      char *t, *tt;

      assert(s != NULL);

      for(t = s; isspace(*t); t++);

      memmove(s, t, strlen(t)+1);

      for (tt = t = s; *t != '\0'; t++)
            if(!isspace(*t))
                  tt = t+1;

      *tt = '\0';

      return s;
}


#ifdef HAVE_CONFIG_H
#     include "config.h"
#endif

/* varargs declarations: */

#ifdef HAVE_STDARG_H
#     define MY_VA_LOCAL_DECL   va_list ap
#     define MY_VA_START(f)     va_start(ap, f)
#     define MY_VA_SHIFT(v,t)   v = va_arg(ap, t)
#     define MY_VA_END          va_end(ap)
#else
#     error HAVE_STDARG_H not defined
#endif

char *
mkstr (const char *format, ... )
{
      MY_VA_LOCAL_DECL;
      size_t size = 100;
      char *buffer = xmalloc (size);

      assert(format != NULL);

      for(;;) {
            int n;
            MY_VA_START(format);
            n = vsnprintf (buffer, size,
                        format, ap);
            MY_VA_END;

            if (n > -1 && n < size)
                  return buffer;

            if (n > -1)
                  size = n + 1;
            else
                  size *= 2;

            buffer = xrealloc(buffer, size);
      }
}


char*
strconcat (const char *str, ...)
{
      unsigned long l;
      MY_VA_LOCAL_DECL;
      char *s, *concat;

      assert(str != NULL);

      l = 1 + strlen (str);
      MY_VA_START(str);
      MY_VA_SHIFT(s, char*);
      while (s) {
            l += strlen (s);
            MY_VA_SHIFT(s, char*);
      }
      MY_VA_END;

      concat =  xmalloc(l);

      strcpy (concat, str);
      MY_VA_START(str);
      MY_VA_SHIFT(s, char*);
      while (s) {
            strcat (concat, s);
            MY_VA_SHIFT(s, char*);
      }
      MY_VA_END;

      return concat;
}


int
safe_strcmp(const char *s1, const char *s2)
{
      if (s1 == NULL && s2 == NULL) return 0;
      if (s1 == NULL) return -1;
      if (s2 == NULL) return 1;

      return strcmp(s1, s2);
}

int
safe_strcoll(const char *s1, const char *s2)
{
#ifdef HAVE_STRCOLL
      if (s1 == NULL && s2 == NULL) return 0;
      if (s1 == NULL) return -1;
      if (s2 == NULL) return 1;

      return strcoll(s1, s2);
#else /* fall back to strcmp */
      return safe_strcmp(s1, s2);
#endif
}

char *
my_getcwd()
{
      char *dir = NULL;
      size_t size = 100;

      if( (dir = xmalloc(size)) == NULL)
            return NULL;

      *dir = 0;

      while( getcwd(dir, size) == NULL && errno == ERANGE )
            if( (dir = xrealloc(dir, size *=2)) == NULL)
                  return NULL;

      return dir;
}

/*
 * getaline()
 *
 * Copyright (c) 1994 Lars Wirzenius
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer
 *    in this position and unchanged.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

char *
getaline(FILE *f)
{
      char *buf;        /* buffer for line */
      size_t size;            /* size of buffer */
      size_t inc;       /* how much to enlarge buffer */
      size_t len;       /* # of chars stored into buf before '\0' */
      char *p;
      const size_t thres = 128; /* initial buffer size (most lines should
                             fit into this size, so think of this as
                             the "long line threshold").  */
      const size_t mucho = 128; /* if there is at least this much wasted
                             space when the whole buffer has been
                             read, try to reclaim it.  Don't make
                             this too small, else there is too much
                             time wasted trying to reclaim a couple
                             of bytes.  */
      const size_t mininc = 64; /* minimum number of bytes by which
                             to increase the allocated memory */

      len = 0;
      size = thres;
      buf = xmalloc(size);

      while (fgets(buf+len, size-len, f) != NULL) {
            len += strlen(buf+len);
            if (len > 0 && buf[len-1] == '\n')
                  break;            /* the whole line has been read */

            for (inc = size, p = NULL; inc > mininc; inc /= 2)
                  if ((p = xrealloc_inc(buf, size, inc)) !=
                              NULL)
                        break;

            size += inc;
            buf = p;
      }

      if (len == 0) {
            xfree(buf);
            return NULL;      /* nothing read (eof or error) */
      }

      if (buf[len-1] == '\n') /* remove newline, if there */
            buf[--len] = '\0';

      if (size - len > mucho) { /* a plenitude of unused memory? */
            p = xrealloc_inc(buf, len, 1);
            if (p != NULL) {
                  buf = p;
                  size = len+1;
            }
      }

      return buf;
}

int
strwidth(const char *s)
{
      assert(s);
#ifdef HANDLE_MULTIBYTE
      return (int)mbswidth(s, 0);
#else
      return strlen(s);
#endif
}

int
bytes2width(const char *s, int width)
{
      assert(s);
#ifdef HANDLE_MULTIBYTE
      return mbsnbytes(s, strlen(s), width, 0);
#else
      return width;
#endif
}

/**************************************************************
 * 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.
 *
 **************************************************************/

#include "config.h"

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

#include <string.h>
# include <ctype.h>
#include <sys/types.h>

/* Define this as a fall through, HAVE_STDARG_H is probably already set */

#if !defined(HAVE_STDARG_H) && !defined(HAVE_VARARGS_H)
#     define HAVE_VARARGS_H   1
#endif

/* varargs declarations: */

#if defined(HAVE_STDARG_H)
/*# include <stdarg.h>*/
# define HAVE_STDARGS    /* let's hope that works everywhere (mj) */
# define VA_LOCAL_DECL   va_list ap
# define VA_START(f)     va_start(ap, f)
# define VA_SHIFT(v,t)  ;   /* no-op for ANSI */
# define VA_END          va_end(ap)
#else
# if defined(HAVE_VARARGS_H)
#  include <varargs.h>
#  undef HAVE_STDARGS
#  define VA_LOCAL_DECL   va_list ap
#  define VA_START(f)     va_start(ap)      /* f is ignored! */
#  define VA_SHIFT(v,t) v = va_arg(ap,t)
#  define VA_END        va_end(ap)
# else
/*XX ** NO VARARGS ** XX*/
# endif
#endif

/*int snprintf (char *str, size_t count, const char *fmt, ...);*/
/*int vsnprintf (char *str, size_t count, const char *fmt, va_list arg);*/

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

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

  state = DP_S_DEFAULT;
  currlen = flags = cflags = min = 0;
  max = -1;
  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:
      /* Currently, we don't support Long Long, bummer */
      switch (ch)
      {
      case 'h':
      cflags = DP_C_SHORT;
      ch = *format++;
      break;
      case 'l':
      cflags = DP_C_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, short int);
      else if (cflags == DP_C_LONG)
        value = va_arg (args, long int);
      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 short int);
      else if (cflags == DP_C_LONG)
        value = va_arg (args, unsigned long int);
      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 short int);
      else if (cflags == DP_C_LONG)
        value = va_arg (args, unsigned long int);
      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 short int);
      else if (cflags == DP_C_LONG)
        value = va_arg (args, unsigned long int);
      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
      {
        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)
{
  int signvalue = 0;
  unsigned long uvalue;
  char convert[20];
  int place = 0;
  int spadlen = 0; /* amount to space pad */
  int zpadlen = 0; /* amount to zero pad */
  int caps = 0;

  if (max < 0)
    max = 0;

  uvalue = value;

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

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

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

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

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

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

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

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

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

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

static long double abs_val (long double value)
{
  long double result = value;

  if (value < 0)
    result = -value;

  return result;
}

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;

  intpart = value;
  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)
{
  int signvalue = 0;
  long double ufvalue;
  char iconvert[20];
  char fconvert[20];
  int iplace = 0;
  int fplace = 0;
  int padlen = 0; /* amount to pad */
  int zpadlen = 0;
  int caps = 0;
  long intpart;
  long fracpart;

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

  ufvalue = abs_val (fvalue);

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

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

  intpart = ufvalue;

  /*
   * Sorry, we only support 9 digits past the decimal because of our
   * conversion method
   */
  if (max > 9)
    max = 9;

  /* We "cheat" by converting the fractional part to integer by
   * multiplying by a factor of 10
   */
  fracpart = round ((pow10 (max)) * (ufvalue - intpart));

  if (fracpart >= pow10 (max))
  {
    intpart++;
    fracpart -= pow10 (max);
  }

#ifdef DEBUG_SNPRINTF
  dprint (1, (debugfile, "fmtfp: %f =? %d.%d\n", fvalue, intpart, fracpart));
#endif

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

  /* Convert fractional part */
  do {
    fconvert[fplace++] =
      (caps? "0123456789ABCDEF":"0123456789abcdef")[fracpart % 10];
    fracpart = (fracpart / 10);
  } while(fracpart && (fplace < 20));
  if (fplace == 20) fplace--;
  fconvert[fplace] = 0;

  /* -1 for decimal point, another -1 if we are printing a sign */
  padlen = min - iplace - max - 1 - ((signvalue) ? 1 : 0);
  zpadlen = max - fplace;
  if (zpadlen < 0)
    zpadlen = 0;
  if (padlen < 0)
    padlen = 0;
  if (flags & DP_F_MINUS)
    padlen = -padlen; /* Left Justifty */

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

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

  /*
   * Decimal point.  This should probably use locale to find the correct
   * char to print out.
   */
  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
/* VARARGS3 */
#ifdef HAVE_STDARGS
int snprintf (char *str,size_t count,const char *fmt,...)
#else
int snprintf (va_alist) va_dcl
#endif
{
#ifndef HAVE_STDARGS
  char *str;
  size_t count;
  char *fmt;
#endif
  VA_LOCAL_DECL;

  VA_START (fmt);
  VA_SHIFT (str, char *);
  VA_SHIFT (count, size_t );
  VA_SHIFT (fmt, char *);
  (void) vsnprintf(str, count, fmt, ap);
  VA_END;
  return(strlen(str));
}

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

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

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

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

#endif /* !HAVE_SNPRINTF */

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