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snprintf.c

/*
 * NOTE: If you change this file, please merge it into rsync, samba, etc.
 */

/*
 * 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
 *
 * date: 2002/12/19 19:56:31;  author: herb;  state: Exp;  lines: +2 -0
 * actually print args for %g and %e
 * 
 * date: 2002/06/03 13:37:52;  author: jmcd;  state: Exp;  lines: +8 -0
 * Since includes.h isn't included here, VA_COPY has to be defined here.  I don't
 * see any include file that is guaranteed to be here, so I'm defining it
 * locally.  Fixes AIX and Solaris builds.
 * 
 * date: 2002/06/03 03:07:24;  author: tridge;  state: Exp;  lines: +5 -13
 * put the ifdef for HAVE_VA_COPY in one place rather than in lots of
 * functions
 * 
 * date: 2002/05/17 14:51:22;  author: jmcd;  state: Exp;  lines: +21 -4
 * Fix usage of va_list passed as an arg.  Use __va_copy before using it
 * when it exists.
 * 
 * date: 2002/04/16 22:38:04;  author: idra;  state: Exp;  lines: +20 -14
 * Fix incorrect zpadlen handling in fmtfp.
 * Thanks to Ollie Oldham <ollie.oldham@metro-optix.com> for spotting it.
 * few mods to make it easier to compile the tests.
 * addedd the "Ollie" test to the floating point ones.
 *
 * Martin Pool (mbp@samba.org) April 2003
 *    Remove NO_CONFIG_H so that the test case can be built within a source
 *    tree with less trouble.
 *    Remove unnecessary SAFE_FREE() definition.
 *
 * Martin Pool (mbp@samba.org) May 2003
 *    Put in a prototype for dummy_snprintf() to quiet compiler warnings.
 *
 *    Move #endif to make sure VA_COPY, LDOUBLE, etc are defined even
 *    if the C library has some snprintf functions already.
 *
 * Darren Tucker (dtucker@zip.com.au) 2005
 *    Fix bug allowing read overruns of the source string with "%.*s"
 *    Usually harmless unless the read runs outside the process' allocation
 *    (eg if your malloc does guard pages) in which case it will segfault.
 *    From OpenSSH.  Also added test for same.
 *
 * Simo Sorce (idra@samba.org) Jan 2006
 * 
 *    Add support for position independent parameters 
 *    fix fmtstr now it conforms to sprintf wrt min.max
 *
 **************************************************************/

#include "replace.h"
#include "system/locale.h"

#ifdef TEST_SNPRINTF /* need math library headers for testing */

/* In test mode, we pretend that this system doesn't have any snprintf
 * functions, regardless of what config.h says. */
#  undef HAVE_SNPRINTF
#  undef HAVE_VSNPRINTF
#  undef HAVE_C99_VSNPRINTF
#  undef HAVE_ASPRINTF
#  undef HAVE_VASPRINTF
#  include <math.h>
#endif /* TEST_SNPRINTF */

#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);
 void dummy_snprintf(void) {} 
#endif /* HAVE_SNPRINTF, etc */

/* yes this really must be a ||. Don't muck with this (tridge) */
#if !defined(HAVE_VSNPRINTF) || !defined(HAVE_C99_VSNPRINTF)

#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

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

/*
 * 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_CHAR    1
#define DP_C_SHORT   2
#define DP_C_LONG    3
#define DP_C_LDOUBLE 4
#define DP_C_LLONG   5
#define DP_C_SIZET   6

/* Chunk types */
#define CNK_FMT_STR 0
#define CNK_INT     1
#define CNK_OCTAL   2
#define CNK_UINT    3
#define CNK_HEX     4
#define CNK_FLOAT   5
#define CNK_CHAR    6
#define CNK_STRING  7
#define CNK_PTR     8
#define CNK_NUM     9
#define CNK_PRCNT   10

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

struct pr_chunk {
      int type; /* chunk type */
      int num; /* parameter number */
      int min; 
      int max;
      int flags;
      int cflags;
      int start;
      int len;
      LLONG value;
      LDOUBLE fvalue;
      char *strvalue;
      void *pnum;
      struct pr_chunk *min_star;
      struct pr_chunk *max_star;
      struct pr_chunk *next;
};

struct pr_chunk_x {
      struct pr_chunk **chunks;
      int num;
};

static int 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,
                LLONG 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);
static struct pr_chunk *new_chunk(void);
static int add_cnk_list_entry(struct pr_chunk_x **list,
                        int max_num, struct pr_chunk *chunk);

static int dopr(char *buffer, size_t maxlen, const char *format, va_list args_in)
{
      char ch;
      int state;
      int pflag;
      int pnum;
      int pfirst;
      size_t currlen;
      va_list args;
      const char *base;
      struct pr_chunk *chunks = NULL;
      struct pr_chunk *cnk = NULL;
      struct pr_chunk_x *clist = NULL;
      int max_pos;
      int ret = -1;

      VA_COPY(args, args_in);

      state = DP_S_DEFAULT;
      pfirst = 1;
      pflag = 0;
      pnum = 0;

      max_pos = 0;
      base = format;
      ch = *format++;
      
      /* retrieve the string structure as chunks */
      while (state != DP_S_DONE) {
            if (ch == '\0') 
                  state = DP_S_DONE;

            switch(state) {
            case DP_S_DEFAULT:
                  
                  if (cnk) {
                        cnk->next = new_chunk();
                        cnk = cnk->next;
                  } else {
                        cnk = new_chunk();
                  }
                  if (!cnk) goto done;
                  if (!chunks) chunks = cnk;
                  
                  if (ch == '%') {
                        state = DP_S_FLAGS;
                        ch = *format++;
                  } else {
                        cnk->type = CNK_FMT_STR;
                        cnk->start = format - base -1;
                        while ((ch != '\0') && (ch != '%')) ch = *format++;
                        cnk->len = format - base - cnk->start -1;
                  }
                  break;
            case DP_S_FLAGS:
                  switch (ch) {
                  case '-':
                        cnk->flags |= DP_F_MINUS;
                        ch = *format++;
                        break;
                  case '+':
                        cnk->flags |= DP_F_PLUS;
                        ch = *format++;
                        break;
                  case ' ':
                        cnk->flags |= DP_F_SPACE;
                        ch = *format++;
                        break;
                  case '#':
                        cnk->flags |= DP_F_NUM;
                        ch = *format++;
                        break;
                  case '0':
                        cnk->flags |= DP_F_ZERO;
                        ch = *format++;
                        break;
                  case 'I':
                        /* internationalization not supported yet */
                        ch = *format++;
                        break;
                  default:
                        state = DP_S_MIN;
                        break;
                  }
                  break;
            case DP_S_MIN:
                  if (isdigit((unsigned char)ch)) {
                        cnk->min = 10 * cnk->min + char_to_int (ch);
                        ch = *format++;
                  } else if (ch == '$') {
                        if (!pfirst && !pflag) {
                              /* parameters must be all positioned or none */
                              goto done;
                        }
                        if (pfirst) {
                              pfirst = 0;
                              pflag = 1;
                        }
                        if (cnk->min == 0) /* what ?? */
                              goto done;
                        cnk->num = cnk->min;
                        cnk->min = 0;
                        ch = *format++;
                  } else if (ch == '*') {
                        if (pfirst) pfirst = 0;
                        cnk->min_star = new_chunk();
                        if (!cnk->min_star) /* out of memory :-( */
                              goto done;
                        cnk->min_star->type = CNK_INT;
                        if (pflag) {
                              int num;
                              ch = *format++;
                              if (!isdigit((unsigned char)ch)) {
                                    /* parameters must be all positioned or none */
                                    goto done;
                              }
                              for (num = 0; isdigit((unsigned char)ch); ch = *format++) {
                                    num = 10 * num + char_to_int(ch);
                              }
                              cnk->min_star->num = num;
                              if (ch != '$') /* what ?? */
                                    goto done;
                        } else {
                              cnk->min_star->num = ++pnum;
                        }
                        max_pos = add_cnk_list_entry(&clist, max_pos, cnk->min_star);
                        if (max_pos == 0) /* out of memory :-( */
                              goto done;
                        ch = *format++;
                        state = DP_S_DOT;
                  } else {
                        if (pfirst) pfirst = 0;
                        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 (cnk->max < 0)
                              cnk->max = 0;
                        cnk->max = 10 * cnk->max + char_to_int (ch);
                        ch = *format++;
                  } else if (ch == '$') {
                        if (!pfirst && !pflag) {
                              /* parameters must be all positioned or none */
                              goto done;
                        }
                        if (cnk->max <= 0) /* what ?? */
                              goto done;
                        cnk->num = cnk->max;
                        cnk->max = -1;
                        ch = *format++;
                  } else if (ch == '*') {
                        cnk->max_star = new_chunk();
                        if (!cnk->max_star) /* out of memory :-( */
                              goto done;
                        cnk->max_star->type = CNK_INT;
                        if (pflag) {
                              int num;
                              ch = *format++;
                              if (!isdigit((unsigned char)ch)) {
                                    /* parameters must be all positioned or none */
                                    goto done;
                              }
                              for (num = 0; isdigit((unsigned char)ch); ch = *format++) {
                                    num = 10 * num + char_to_int(ch);
                              }
                              cnk->max_star->num = num;
                              if (ch != '$') /* what ?? */
                                    goto done;
                        } else {
                              cnk->max_star->num = ++pnum;
                        }
                        max_pos = add_cnk_list_entry(&clist, max_pos, cnk->max_star);
                        if (max_pos == 0) /* out of memory :-( */
                              goto done;

                        ch = *format++;
                        state = DP_S_MOD;
                  } else {
                        state = DP_S_MOD;
                  }
                  break;
            case DP_S_MOD:
                  switch (ch) {
                  case 'h':
                        cnk->cflags = DP_C_SHORT;
                        ch = *format++;
                        if (ch == 'h') {
                              cnk->cflags = DP_C_CHAR;
                              ch = *format++;
                        }
                        break;
                  case 'l':
                        cnk->cflags = DP_C_LONG;
                        ch = *format++;
                        if (ch == 'l') {  /* It's a long long */
                              cnk->cflags = DP_C_LLONG;
                              ch = *format++;
                        }
                        break;
                  case 'L':
                        cnk->cflags = DP_C_LDOUBLE;
                        ch = *format++;
                        break;
                  case 'z':
                        cnk->cflags = DP_C_SIZET;
                        ch = *format++;
                        break;
                  default:
                        break;
                  }
                  state = DP_S_CONV;
                  break;
            case DP_S_CONV:
                  if (cnk->num == 0) cnk->num = ++pnum;
                  max_pos = add_cnk_list_entry(&clist, max_pos, cnk);
                  if (max_pos == 0) /* out of memory :-( */
                        goto done;
                  
                  switch (ch) {
                  case 'd':
                  case 'i':
                        cnk->type = CNK_INT;
                        break;
                  case 'o':
                        cnk->type = CNK_OCTAL;
                        cnk->flags |= DP_F_UNSIGNED;
                        break;
                  case 'u':
                        cnk->type = CNK_UINT;
                        cnk->flags |= DP_F_UNSIGNED;
                        break;
                  case 'X':
                        cnk->flags |= DP_F_UP;
                  case 'x':
                        cnk->type = CNK_HEX;
                        cnk->flags |= DP_F_UNSIGNED;
                        break;
                  case 'A':
                        /* hex float not supported yet */
                  case 'E':
                  case 'G':
                  case 'F':
                        cnk->flags |= DP_F_UP;
                  case 'a':
                        /* hex float not supported yet */
                  case 'e':
                  case 'f':
                  case 'g':
                        cnk->type = CNK_FLOAT;
                        break;
                  case 'c':
                        cnk->type = CNK_CHAR;
                        break;
                  case 's':
                        cnk->type = CNK_STRING;
                        break;
                  case 'p':
                        cnk->type = CNK_PTR;
                        break;
                  case 'n':
                        cnk->type = CNK_NUM;
                        break;
                  case '%':
                        cnk->type = CNK_PRCNT;
                        break;
                  default:
                        /* Unknown, bail out*/
                        goto done;
                  }
                  ch = *format++;
                  state = DP_S_DEFAULT;
                  break;
            case DP_S_DONE:
                  break;
            default:
                  /* hmm? */
                  break; /* some picky compilers need this */
            }
      }

      /* retieve the format arguments */
      for (pnum = 0; pnum < max_pos; pnum++) {
            int i;

            if (clist[pnum].num == 0) {
                  /* ignoring a parameter should not be permitted
                   * all parameters must be matched at least once
                   * BUT seem some system ignore this rule ...
                   * at least my glibc based system does --SSS
                   */
#ifdef DEBUG_SNPRINTF
                  printf("parameter at position %d not used\n", pnum+1);
#endif
                  /* eat the parameter */
                  va_arg (args, int);
                  continue;
            }
            for (i = 1; i < clist[pnum].num; i++) {
                  if (clist[pnum].chunks[0]->type != clist[pnum].chunks[i]->type) {
                        /* nooo noo no!
                         * all the references to a parameter
                         * must be of the same type
                         */
                        goto done;
                  }
            }
            cnk = clist[pnum].chunks[0];
            switch (cnk->type) {
            case CNK_INT:
                  if (cnk->cflags == DP_C_SHORT) 
                        cnk->value = va_arg (args, int);
                  else if (cnk->cflags == DP_C_LONG)
                        cnk->value = va_arg (args, long int);
                  else if (cnk->cflags == DP_C_LLONG)
                        cnk->value = va_arg (args, LLONG);
                  else if (cnk->cflags == DP_C_SIZET)
                        cnk->value = va_arg (args, ssize_t);
                  else
                        cnk->value = va_arg (args, int);

                  for (i = 1; i < clist[pnum].num; i++) {
                        clist[pnum].chunks[i]->value = cnk->value;
                  }
                  break;

            case CNK_OCTAL:
            case CNK_UINT:
            case CNK_HEX:
                  if (cnk->cflags == DP_C_SHORT)
                        cnk->value = va_arg (args, unsigned int);
                  else if (cnk->cflags == DP_C_LONG)
                        cnk->value = (unsigned long int)va_arg (args, unsigned long int);
                  else if (cnk->cflags == DP_C_LLONG)
                        cnk->value = (LLONG)va_arg (args, unsigned LLONG);
                  else if (cnk->cflags == DP_C_SIZET)
                        cnk->value = (size_t)va_arg (args, size_t);
                  else
                        cnk->value = (unsigned int)va_arg (args, unsigned int);

                  for (i = 1; i < clist[pnum].num; i++) {
                        clist[pnum].chunks[i]->value = cnk->value;
                  }
                  break;

            case CNK_FLOAT:
                  if (cnk->cflags == DP_C_LDOUBLE)
                        cnk->fvalue = va_arg (args, LDOUBLE);
                  else
                        cnk->fvalue = va_arg (args, double);

                  for (i = 1; i < clist[pnum].num; i++) {
                        clist[pnum].chunks[i]->fvalue = cnk->fvalue;
                  }
                  break;

            case CNK_CHAR:
                  cnk->value = va_arg (args, int);

                  for (i = 1; i < clist[pnum].num; i++) {
                        clist[pnum].chunks[i]->value = cnk->value;
                  }
                  break;

            case CNK_STRING:
                  cnk->strvalue = va_arg (args, char *);
                  if (!cnk->strvalue) cnk->strvalue = "(NULL)";

                  for (i = 1; i < clist[pnum].num; i++) {
                        clist[pnum].chunks[i]->strvalue = cnk->strvalue;
                  }
                  break;

            case CNK_PTR:
                  cnk->strvalue = va_arg (args, void *);
                  for (i = 1; i < clist[pnum].num; i++) {
                        clist[pnum].chunks[i]->strvalue = cnk->strvalue;
                  }
                  break;

            case CNK_NUM:
                  if (cnk->cflags == DP_C_CHAR)
                        cnk->pnum = va_arg (args, char *);
                  else if (cnk->cflags == DP_C_SHORT)
                        cnk->pnum = va_arg (args, short int *);
                  else if (cnk->cflags == DP_C_LONG)
                        cnk->pnum = va_arg (args, long int *);
                  else if (cnk->cflags == DP_C_LLONG)
                        cnk->pnum = va_arg (args, LLONG *);
                  else if (cnk->cflags == DP_C_SIZET)
                        cnk->pnum = va_arg (args, ssize_t *);
                  else
                        cnk->pnum = va_arg (args, int *);

                  for (i = 1; i < clist[pnum].num; i++) {
                        clist[pnum].chunks[i]->pnum = cnk->pnum;
                  }
                  break;

            case CNK_PRCNT:
                  break;

            default:
                  /* what ?? */
                  goto done;
            }
      }
      /* print out the actual string from chunks */
      currlen = 0;
      cnk = chunks;
      while (cnk) {
            int len, min, max;

            if (cnk->min_star) min = cnk->min_star->value;
            else min = cnk->min;
            if (cnk->max_star) max = cnk->max_star->value;
            else max = cnk->max;

            switch (cnk->type) {

            case CNK_FMT_STR:
                  if (maxlen != 0 && maxlen > currlen) {
                        if (maxlen > (currlen + cnk->len)) len = cnk->len;
                        else len = maxlen - currlen;

                        memcpy(&(buffer[currlen]), &(base[cnk->start]), len);
                  }
                  currlen += cnk->len;
                        
                  break;

            case CNK_INT:
            case CNK_UINT:
                  fmtint (buffer, &currlen, maxlen, cnk->value, 10, min, max, cnk->flags);
                  break;

            case CNK_OCTAL:
                  fmtint (buffer, &currlen, maxlen, cnk->value, 8, min, max, cnk->flags);
                  break;

            case CNK_HEX:
                  fmtint (buffer, &currlen, maxlen, cnk->value, 16, min, max, cnk->flags);
                  break;

            case CNK_FLOAT:
                  fmtfp (buffer, &currlen, maxlen, cnk->fvalue, min, max, cnk->flags);
                  break;

            case CNK_CHAR:
                  dopr_outch (buffer, &currlen, maxlen, cnk->value);
                  break;

            case CNK_STRING:
                  if (max == -1) {
                        max = strlen(cnk->strvalue);
                  }
                  fmtstr (buffer, &currlen, maxlen, cnk->strvalue, cnk->flags, min, max);
                  break;

            case CNK_PTR:
                  fmtint (buffer, &currlen, maxlen, (long)(cnk->strvalue), 16, min, max, cnk->flags);
                  break;

            case CNK_NUM:
                  if (cnk->cflags == DP_C_CHAR)
                        *((char *)(cnk->pnum)) = (char)currlen;
                  else if (cnk->cflags == DP_C_SHORT)
                        *((short int *)(cnk->pnum)) = (short int)currlen;
                  else if (cnk->cflags == DP_C_LONG)
                        *((long int *)(cnk->pnum)) = (long int)currlen;
                  else if (cnk->cflags == DP_C_LLONG)
                        *((LLONG *)(cnk->pnum)) = (LLONG)currlen;
                  else if (cnk->cflags == DP_C_SIZET)
                        *((ssize_t *)(cnk->pnum)) = (ssize_t)currlen;
                  else
                        *((int *)(cnk->pnum)) = (int)currlen;
                  break;

            case CNK_PRCNT:
                  dopr_outch (buffer, &currlen, maxlen, '%');
                  break;

            default:
                  /* what ?? */
                  goto done;
            }
            cnk = cnk->next;
      }
      if (maxlen != 0) {
            if (currlen < maxlen - 1) 
                  buffer[currlen] = '\0';
            else if (maxlen > 0) 
                  buffer[maxlen - 1] = '\0';
      }
      ret = currlen;

done:
      va_end(args);

      while (chunks) {
            cnk = chunks->next;
            free(chunks);
            chunks = cnk;
      }
      if (clist) {
            for (pnum = 0; pnum < max_pos; pnum++) {
                  if (clist[pnum].chunks) free(clist[pnum].chunks);
            }
            free(clist);
      }
      return ret;
}

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; strln < max && value[strln]; ++strln); /* strlen */
      padlen = min - strln;
      if (padlen < 0) 
            padlen = 0;
      if (flags & DP_F_MINUS) 
            padlen = -padlen; /* Left Justify */
      
      while (padlen > 0) {
            dopr_outch (buffer, currlen, maxlen, ' ');
            --padlen;
      }
      while (*value && (cnt < max)) {
            dopr_outch (buffer, currlen, maxlen, *value++);
            ++cnt;
      }
      while (padlen < 0) {
            dopr_outch (buffer, currlen, maxlen, ' ');
            ++padlen;
      }
}

/* Have to handle DP_F_NUM (ie 0x and 0 alternates) */

static void fmtint(char *buffer, size_t *currlen, size_t maxlen,
                LLONG value, int base, int min, int max, int flags)
{
      int signvalue = 0;
      unsigned LLONG 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;
      LLONG l=0;
      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 idx;
      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 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
       */

      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);
            idx = (int) ((temp -intpart +0.05)* 10.0);
            /* idx = (int) (((double)(temp*0.1) -intpart +0.05) *10.0); */
            /* printf ("%llf, %f, %x\n", temp, intpart, idx); */
            iconvert[iplace++] =
                  (caps? "0123456789ABCDEF":"0123456789abcdef")[idx];
      } 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);
                  idx = (int) ((temp -fracpart +0.05)* 10.0);
                  /* idx = (int) ((((temp/10) -fracpart) +0.05) *10); */
                  /* printf ("%lf, %lf, %ld\n", temp, fracpart, idx ); */
                  fconvert[fplace++] =
                  (caps? "0123456789ABCDEF":"0123456789abcdef")[idx];
            } 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)++;
}

static struct pr_chunk *new_chunk(void) {
      struct pr_chunk *new_c = (struct pr_chunk *)malloc(sizeof(struct pr_chunk));

      if (!new_c)
            return NULL;

      new_c->type = 0;
      new_c->num = 0;
      new_c->min = 0;
      new_c->min_star = NULL;
      new_c->max = -1;
      new_c->max_star = NULL;
      new_c->flags = 0;
      new_c->cflags = 0;
      new_c->start = 0;
      new_c->len = 0;
      new_c->value = 0;
      new_c->fvalue = 0;
      new_c->strvalue = NULL;
      new_c->pnum = NULL;
      new_c->next = NULL;

      return new_c;
}

static int add_cnk_list_entry(struct pr_chunk_x **list,
                        int max_num, struct pr_chunk *chunk) {
      struct pr_chunk_x *l;
      struct pr_chunk **c;
      int max;
      int cnum;
      int i, pos;

      if (chunk->num > max_num) {
            max = chunk->num;
      
            if (*list == NULL) {
                  l = (struct pr_chunk_x *)malloc(sizeof(struct pr_chunk_x) * max);
                  pos = 0;
            } else {
                  l = (struct pr_chunk_x *)realloc(*list, sizeof(struct pr_chunk_x) * max);
                  pos = max_num;
            }
            if (l == NULL) {
                  for (i = 0; i < max; i++) {
                        if ((*list)[i].chunks) free((*list)[i].chunks);
                  }
                  return 0;
            }
            for (i = pos; i < max; i++) {
                  l[i].chunks = NULL;
                  l[i].num = 0;
            }
      } else {
            l = *list;
            max = max_num;
      }

      i = chunk->num - 1;
      cnum = l[i].num + 1;
      if (l[i].chunks == NULL) {
            c = (struct pr_chunk **)malloc(sizeof(struct pr_chunk *) * cnum); 
      } else {
            c = (struct pr_chunk **)realloc(l[i].chunks, sizeof(struct pr_chunk *) * cnum);
      }
      if (c == NULL) {
            for (i = 0; i < max; i++) {
                  if (l[i].chunks) free(l[i].chunks);
            }
            return 0;
      }
      c[l[i].num] = chunk;
      l[i].chunks = c;
      l[i].num = cnum;

      *list = l;
      return max;
}

 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 with 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.
 */
#if !defined(HAVE_SNPRINTF) || !defined(HAVE_C99_VSNPRINTF)
 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

#ifndef HAVE_C99_VSNPRINTF
 int printf(const char *fmt, ...)
{
      va_list ap;
      int ret;
      char *s;

      s = NULL;
      va_start(ap, fmt);
      ret = vasprintf(&s, fmt, ap);
      va_end(ap);

      if (s) {
            fwrite(s, 1, strlen(s), stdout);
      }
      free(s);

      return ret;
}
#endif

#ifndef HAVE_C99_VSNPRINTF
 int fprintf(FILE *stream, const char *fmt, ...)
{
      va_list ap;
      int ret;
      char *s;

      s = NULL;
      va_start(ap, fmt);
      ret = vasprintf(&s, fmt, ap);
      va_end(ap);

      if (s) {
            fwrite(s, 1, strlen(s), stream);
      }
      free(s);

      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);
      va_end(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);
      va_end(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

#ifdef TEST_SNPRINTF

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

 int main (void)
{
      char buf1[1024];
      char buf2[1024];
      char *buf3;
      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",
            "%-8.8f",
            "%-9.9f",
            NULL
      };
      double fp_nums[] = { 6442452944.1234, -1.5, 134.21, 91340.2, 341.1234, 203.9, 0.96, 0.996, 
                       0.9996, 1.996, 4.136, 5.030201, 0.00205,
                       /* END LIST */ 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, 1234567890, 0};
      char *str_fmt[] = {
            "%10.5s",
            "%-10.5s",
            "%5.10s",
            "%-5.10s",
            "%10.1s",
            "%0.10s",
            "%10.0s",
            "%1.10s",
            "%s",
            "%.1s",
            "%.10s",
            "%10s",
            NULL
      };
      char *str_vals[] = {"hello", "a", "", "a longer string", NULL};
#ifdef HAVE_LONG_LONG
      char *ll_fmt[] = {
            "%llu",
            NULL
      };
      LLONG ll_nums[] = { 134, 91340, 341, 0203, 1234567890, 128006186140000000LL, 0};
#endif
      int x, y;
      int fail = 0;
      int num = 0;
      int l1, l2;
      char *ss_fmt[] = {
            "%zd",
            "%zu",
            NULL
      };
      size_t ss_nums[] = {134, 91340, 123456789, 0203, 1234567890, 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++) {
                  buf1[0] = buf2[0] = '\0';
                  l1 = snprintf(buf1, sizeof(buf1), fp_fmt[x], fp_nums[y]);
                  l2 = sprintf (buf2, fp_fmt[x], fp_nums[y]);
                  buf1[1023] = buf2[1023] = '\0';
                  if (strcmp (buf1, buf2) || (l1 != l2)) {
                        printf("snprintf doesn't match Format: %s\n\tsnprintf(%d) = [%s]\n\t sprintf(%d) = [%s]\n", 
                               fp_fmt[x], l1, buf1, l2, buf2);
                        fail++;
                  }
                  num++;
            }
      }

      for (x = 0; int_fmt[x] ; x++) {
            for (y = 0; int_nums[y] != 0 ; y++) {
                  buf1[0] = buf2[0] = '\0';
                  l1 = snprintf(buf1, sizeof(buf1), int_fmt[x], int_nums[y]);
                  l2 = sprintf (buf2, int_fmt[x], int_nums[y]);
                  buf1[1023] = buf2[1023] = '\0';
                  if (strcmp (buf1, buf2) || (l1 != l2)) {
                        printf("snprintf doesn't match Format: %s\n\tsnprintf(%d) = [%s]\n\t sprintf(%d) = [%s]\n", 
                               int_fmt[x], l1, buf1, l2, buf2);
                        fail++;
                  }
                  num++;
            }
      }

      for (x = 0; str_fmt[x] ; x++) {
            for (y = 0; str_vals[y] != 0 ; y++) {
                  buf1[0] = buf2[0] = '\0';
                  l1 = snprintf(buf1, sizeof(buf1), str_fmt[x], str_vals[y]);
                  l2 = sprintf (buf2, str_fmt[x], str_vals[y]);
                  buf1[1023] = buf2[1023] = '\0';
                  if (strcmp (buf1, buf2) || (l1 != l2)) {
                        printf("snprintf doesn't match Format: %s\n\tsnprintf(%d) = [%s]\n\t sprintf(%d) = [%s]\n", 
                               str_fmt[x], l1, buf1, l2, buf2);
                        fail++;
                  }
                  num++;
            }
      }

#ifdef HAVE_LONG_LONG
      for (x = 0; ll_fmt[x] ; x++) {
            for (y = 0; ll_nums[y] != 0 ; y++) {
                  buf1[0] = buf2[0] = '\0';
                  l1 = snprintf(buf1, sizeof(buf1), ll_fmt[x], ll_nums[y]);
                  l2 = sprintf (buf2, ll_fmt[x], ll_nums[y]);
                  buf1[1023] = buf2[1023] = '\0';
                  if (strcmp (buf1, buf2) || (l1 != l2)) {
                        printf("snprintf doesn't match Format: %s\n\tsnprintf(%d) = [%s]\n\t sprintf(%d) = [%s]\n", 
                               ll_fmt[x], l1, buf1, l2, buf2);
                        fail++;
                  }
                  num++;
            }
      }
#endif

#define BUFSZ 2048

      buf1[0] = buf2[0] = '\0';
      if ((buf3 = malloc(BUFSZ)) == NULL) {
            fail++;
      } else {
            num++;
            memset(buf3, 'a', BUFSZ);
            snprintf(buf1, sizeof(buf1), "%.*s", 1, buf3);
            buf1[1023] = '\0';
            if (strcmp(buf1, "a") != 0) {
                  printf("length limit buf1 '%s' expected 'a'\n", buf1);
                  fail++;
            }
        }

      buf1[0] = buf2[0] = '\0';
      l1 = snprintf(buf1, sizeof(buf1), "%4$*1$d %2$s %3$*1$.*1$f", 3, "pos test", 12.3456, 9);
      l2 = sprintf(buf2, "%4$*1$d %2$s %3$*1$.*1$f", 3, "pos test", 12.3456, 9);
      buf1[1023] = buf2[1023] = '\0';
      if (strcmp(buf1, buf2) || (l1 != l2)) {
            printf("snprintf doesn't match Format: %s\n\tsnprintf(%d) = [%s]\n\t sprintf(%d) = [%s]\n",
                        "%4$*1$d %2$s %3$*1$.*1$f", l1, buf1, l2, buf2);
            fail++;
      }

      buf1[0] = buf2[0] = '\0';
      l1 = snprintf(buf1, sizeof(buf1), "%4$*4$d %2$s %3$*4$.*4$f", 3, "pos test", 12.3456, 9);
      l2 = sprintf(buf2, "%4$*4$d %2$s %3$*4$.*4$f", 3, "pos test", 12.3456, 9);
      buf1[1023] = buf2[1023] = '\0';
      if (strcmp(buf1, buf2)) {
            printf("snprintf doesn't match Format: %s\n\tsnprintf(%d) = [%s]\n\t sprintf(%d) = [%s]\n",
                        "%4$*1$d %2$s %3$*1$.*1$f", l1, buf1, l2, buf2);
            fail++;
      }

      for (x = 0; ss_fmt[x] ; x++) {
            for (y = 0; ss_nums[y] != 0 ; y++) {
                  buf1[0] = buf2[0] = '\0';
                  l1 = snprintf(buf1, sizeof(buf1), ss_fmt[x], ss_nums[y]);
                  l2 = sprintf (buf2, ss_fmt[x], ss_nums[y]);
                  buf1[1023] = buf2[1023] = '\0';
                  if (strcmp (buf1, buf2) || (l1 != l2)) {
                        printf("snprintf doesn't match Format: %s\n\tsnprintf(%d) = [%s]\n\t sprintf(%d) = [%s]\n", 
                               ss_fmt[x], l1, buf1, l2, buf2);
                        fail++;
                  }
                  num++;
            }
      }
#if 0
      buf1[0] = buf2[0] = '\0';
      l1 = snprintf(buf1, sizeof(buf1), "%lld", (LLONG)1234567890);
      l2 = sprintf(buf2, "%lld", (LLONG)1234567890);
      buf1[1023] = buf2[1023] = '\0';
      if (strcmp(buf1, buf2)) {
            printf("snprintf doesn't match Format: %s\n\tsnprintf(%d) = [%s]\n\t sprintf(%d) = [%s]\n",
                        "%lld", l1, buf1, l2, buf2);
            fail++;
      }

      buf1[0] = buf2[0] = '\0';
      l1 = snprintf(buf1, sizeof(buf1), "%Lf", (LDOUBLE)890.1234567890123);
      l2 = sprintf(buf2, "%Lf", (LDOUBLE)890.1234567890123);
      buf1[1023] = buf2[1023] = '\0';
      if (strcmp(buf1, buf2)) {
            printf("snprintf doesn't match Format: %s\n\tsnprintf(%d) = [%s]\n\t sprintf(%d) = [%s]\n",
                        "%Lf", l1, buf1, l2, buf2);
            fail++;
      }
#endif
      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 /* TEST_SNPRINTF */

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