usr/src/lib/libc/port/locale/strfmon.c

   1 /*
   2  * Copyright 2013 Garrett D'Amore <garrett@damore.org>
   3  * Copyright 2010 Nexenta Systems, Inc.  All rights reserved.
   4  * Copyright (c) 2001 Alexey Zelkin <phantom@FreeBSD.org>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  */
  29
  30 #ifndef _LCONV_C99
  31 #define _LCONV_C99
  32 #endif
  33
  34 #include "lint.h"
  35 #include <sys/types.h>
  36 #include <ctype.h>
  37 #include <errno.h>
  38 #include <limits.h>
  39 #include <locale.h>
  40 #include <monetary.h>
  41 #include <stdarg.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45 #include "localeimpl.h"
  46 #include "lmonetary.h"
  47 #include "lnumeric.h"
  48
  49 /* internal flags */
  50 #define NEED_GROUPING           0x01    /* print digits grouped (default) */
  51 #define SIGN_POSN_USED          0x02    /* '+' or '(' usage flag */
  52 #define LOCALE_POSN             0x04    /* use locale defined +/- (default) */
  53 #define PARENTH_POSN            0x08    /* enclose negative amount in () */
  54 #define SUPRESS_CURR_SYMBOL     0x10    /* supress the currency from output */
  55 #define LEFT_JUSTIFY            0x20    /* left justify */
  56 #define USE_INTL_CURRENCY       0x40    /* use international currency symbol */
  57 #define IS_NEGATIVE             0x80    /* is argument value negative ? */
  58
  59 /* internal macros */
  60 #define PRINT(CH) {                                             \
  61         if (dst >= s + maxsize)                                 \
  62                 goto e2big_error;                               \
  63         *dst++ = CH;                                            \
  64 }
  65
  66 #define PRINTS(STR) {                                           \
  67         const char *tmps = STR;                                 \
  68         while (*tmps != '\0')                                   \
  69                 PRINT(*tmps++);                                 \
  70 }
  71
  72 #define GET_NUMBER(VAR) {                                       \
  73         VAR = 0;                                                \
  74         while (isdigit((unsigned char)*fmt)) {                  \
  75                 if (VAR > INT_MAX / 10)                         \
  76                         goto e2big_error;                       \
  77                 VAR *= 10;                                      \
  78                 VAR += *fmt - '0';                              \
  79                 if (VAR < 0)                                    \
  80                         goto e2big_error;                       \
  81                 fmt++;                                          \
  82         }                                                       \
  83 }
  84
  85 #define GRPCPY(howmany) {                                       \
  86         int i = howmany;                                        \
  87         while (i-- > 0) {                                       \
  88                 avalue_size--;                                  \
  89                 *--bufend = *(avalue+avalue_size+padded);       \
  90         }                                                       \
  91 }
  92
  93 #define GRPSEP {                                                \
  94         bufend -= thousands_len;                                \
  95         (void) memcpy(bufend, thousands_sep, thousands_len);    \
  96         groups++;                                               \
  97 }
  98
  99 static void setup_vars(const struct lc_monetary *, int, char *, char *, char *,
 100     const char **);
 101 static int calc_left_pad(const struct lc_monetary *, int, const char *);
 102 static char *format_grouped_double(const struct lc_monetary *,
 103     const struct lc_numeric *, double, int *, int, int, int);
 104
 105 ssize_t
 106 strfmon_impl(char *_RESTRICT_KYWD s, size_t maxsize, locale_t loc,
 107     const char *_RESTRICT_KYWD format, va_list ap)
 108 {
 109         char            *dst;           /* output destination pointer */
 110         const char      *fmt;           /* current format poistion pointer */
 111         char            *asciivalue;    /* formatted double pointer */
 112
 113         int             flags;          /* formatting options */
 114         int             pad_char;       /* padding character */
 115         int             pad_size;       /* pad size */
 116         int             width;          /* field width */
 117         int             left_prec;      /* left precision */
 118         int             right_prec;     /* right precision */
 119         double          value;          /* just value */
 120         char            space_char = ' '; /* space after currency */
 121
 122         char            cs_precedes;    /* values from struct lc_monetary */
 123         char            sep_by_space;
 124         char            sign_posn;
 125         const char      *signstr;
 126         const char      *currency_symbol;
 127
 128         char            *tmpptr;        /* temporary vars */
 129         int             sverrno;
 130         const struct lc_monetary *lmon;         /* monetary structure */
 131         const struct lc_numeric *lnum;          /* numeric structure */
 132
 133         lmon = loc->monetary;
 134         lnum = loc->numeric;
 135
 136         dst = s;
 137         fmt = format;
 138         asciivalue = NULL;
 139         currency_symbol = NULL;
 140         pad_size = 0;
 141
 142         while (*fmt) {
 143                 /* pass nonformating characters AS IS */
 144                 if (*fmt != '%')
 145                         goto literal;
 146
 147                 /* '%' found ! */
 148
 149                 /* "%%" mean just '%' */
 150                 if (*(fmt+1) == '%') {
 151                         fmt++;
 152         literal:
 153                         PRINT(*fmt++);
 154                         continue;
 155                 }
 156
 157                 /* set up initial values */
 158                 flags = (NEED_GROUPING|LOCALE_POSN);
 159                 pad_char = ' ';         /* padding character is "space" */
 160                 left_prec = -1;         /* no left precision specified */
 161                 right_prec = -1;        /* no right precision specified */
 162                 width = -1;             /* no width specified */
 163                 value = 0;              /* we have no value to print now */
 164
 165                 /* Flags */
 166                 for (;;) {
 167                         switch (*++fmt) {
 168                                 case '=':       /* fill character */
 169                                         pad_char = *++fmt;
 170                                         if (pad_char == '\0')
 171                                                 goto format_error;
 172                                         continue;
 173                                 case '^':       /* not group currency  */
 174                                         flags &= ~(NEED_GROUPING);
 175                                         continue;
 176                                 case '+':       /* use locale defined signs */
 177                                         if (flags & SIGN_POSN_USED)
 178                                                 goto format_error;
 179                                         flags |= (SIGN_POSN_USED|LOCALE_POSN);
 180                                         continue;
 181                                 case '(':       /* enclose negatives with () */
 182                                         if (flags & SIGN_POSN_USED)
 183                                                 goto format_error;
 184                                         flags |= (SIGN_POSN_USED|PARENTH_POSN);
 185                                         continue;
 186                                 case '!':       /* suppress currency symbol */
 187                                         flags |= SUPRESS_CURR_SYMBOL;
 188                                         continue;
 189                                 case '-':       /* alignment (left)  */
 190                                         flags |= LEFT_JUSTIFY;
 191                                         continue;
 192                                 default:
 193                                         break;
 194                         }
 195                         break;
 196                 }
 197
 198                 /* field Width */
 199                 if (isdigit((unsigned char)*fmt)) {
 200                         GET_NUMBER(width);
 201                         /*
 202                          * Do we have enough space to put number with
 203                          * required width ?
 204                          */
 205                         if ((unsigned int)width >= maxsize - (dst - s))
 206                                 goto e2big_error;
 207                 }
 208
 209                 /* Left precision */
 210                 if (*fmt == '#') {
 211                         if (!isdigit((unsigned char)*++fmt))
 212                                 goto format_error;
 213                         GET_NUMBER(left_prec);
 214                         if ((unsigned int)left_prec >= maxsize - (dst - s))
 215                                 goto e2big_error;
 216                 }
 217
 218                 /* Right precision */
 219                 if (*fmt == '.') {
 220                         if (!isdigit((unsigned char)*++fmt))
 221                                 goto format_error;
 222                         GET_NUMBER(right_prec);
 223                         if ((unsigned int)right_prec >= maxsize - (dst - s) -
 224                             left_prec)
 225                                 goto e2big_error;
 226                 }
 227
 228                 /* Conversion Characters */
 229                 switch (*fmt++) {
 230                         case 'i':       /* use internaltion currency format */
 231                                 flags |= USE_INTL_CURRENCY;
 232                                 break;
 233                         case 'n':       /* use national currency format */
 234                                 flags &= ~(USE_INTL_CURRENCY);
 235                                 break;
 236                         default:
 237                                 /* required char missing or premature EOS */
 238                                 goto format_error;
 239                 }
 240
 241                 if (flags & USE_INTL_CURRENCY) {
 242                         currency_symbol = lmon->int_curr_symbol;
 243                         /* by definition three letters followed by a space */
 244                         if (currency_symbol != NULL)
 245                                 space_char = currency_symbol[3];
 246                 } else
 247                         currency_symbol = lmon->currency_symbol;
 248
 249                 /* value itself */
 250                 value = va_arg(ap, double);
 251
 252                 /* detect sign */
 253                 if (value < 0) {
 254                         flags |= IS_NEGATIVE;
 255                         value = -value;
 256                 }
 257
 258                 /* fill left_prec with amount of padding chars */
 259                 if (left_prec >= 0) {
 260                         pad_size = calc_left_pad(lmon, (flags ^ IS_NEGATIVE),
 261                             currency_symbol) -
 262                             calc_left_pad(lmon, flags, currency_symbol);
 263                         if (pad_size < 0)
 264                                 pad_size = 0;
 265                 }
 266
 267                 if (asciivalue != NULL)
 268                         free(asciivalue);
 269                 asciivalue = format_grouped_double(lmon, lnum, value, &flags,
 270                     left_prec, right_prec, pad_char);
 271                 if (asciivalue == NULL)
 272                         goto end_error;         /* errno already set */
 273                                                 /* to ENOMEM by malloc() */
 274
 275                 /* set some variables for later use */
 276                 setup_vars(lmon, flags, &cs_precedes, &sep_by_space,
 277                     &sign_posn, &signstr);
 278
 279                 /*
 280                  * Description of some LC_MONETARY's values:
 281                  *
 282                  * p_cs_precedes & n_cs_precedes
 283                  *
 284                  * = 1 - $currency_symbol precedes the value
 285                  *       for a monetary quantity with a non-negative value
 286                  * = 0 - symbol succeeds the value
 287                  *
 288                  * p_sep_by_space & n_sep_by_space
 289                  *
 290                  * = 0 - no space separates $currency_symbol
 291                  *       from the value for a monetary quantity with a
 292                  *       non-negative value
 293                  * = 1 - space separates the symbol from the value
 294                  * = 2 - space separates the symbol and the sign string,
 295                  *       if adjacent.
 296                  *
 297                  * p_sign_posn & n_sign_posn
 298                  *
 299                  * = 0 - parentheses enclose the quantity and the
 300                  *       $currency_symbol
 301                  * = 1 - the sign string precedes the quantity and the
 302                  *       $currency_symbol
 303                  * = 2 - the sign string succeeds the quantity and the
 304                  *       $currency_symbol
 305                  * = 3 - the sign string precedes the $currency_symbol
 306                  * = 4 - the sign string succeeds the $currency_symbol
 307                  *
 308                  */
 309
 310                 tmpptr = dst;
 311
 312                 while (pad_size-- > 0)
 313                         PRINT(' ');
 314
 315                 if (sign_posn == 0 && (flags & IS_NEGATIVE))
 316                         PRINT('(');
 317
 318                 if (cs_precedes == 1) {
 319                         if (sign_posn == 1 || sign_posn == 3) {
 320                                 PRINTS(signstr);
 321                                 if (sep_by_space == 2)
 322                                         PRINT(' ');
 323                         }
 324
 325                         if (!(flags & SUPRESS_CURR_SYMBOL)) {
 326                                 PRINTS(currency_symbol);
 327
 328                                 if (sign_posn == 4) {
 329                                         if (sep_by_space == 2)
 330                                                 PRINT(space_char);
 331                                         PRINTS(signstr);
 332                                         if (sep_by_space == 1)
 333                                                 PRINT(' ');
 334                                 } else if (sep_by_space == 1)
 335                                         PRINT(space_char);
 336                         }
 337                 } else if (sign_posn == 1)
 338                         PRINTS(signstr);
 339
 340                 PRINTS(asciivalue);
 341
 342                 if (cs_precedes == 0) {
 343                         if (sign_posn == 3) {
 344                                 if (sep_by_space == 1)
 345                                         PRINT(' ');
 346                                 PRINTS(signstr);
 347                         }
 348
 349                         if (!(flags & SUPRESS_CURR_SYMBOL)) {
 350                                 if ((sign_posn == 3 && sep_by_space == 2) ||
 351                                     (sep_by_space == 1 && (sign_posn == 0 ||
 352                                     sign_posn == 1 || sign_posn == 2 ||
 353                                     sign_posn == 4)))
 354                                         PRINT(space_char);
 355                                 PRINTS(currency_symbol); /* XXX: len */
 356                                 if (sign_posn == 4) {
 357                                         if (sep_by_space == 2)
 358                                                 PRINT(' ');
 359                                         PRINTS(signstr);
 360                                 }
 361                         }
 362                 }
 363
 364                 if (sign_posn == 2) {
 365                         if (sep_by_space == 2)
 366                                 PRINT(' ');
 367                         PRINTS(signstr);
 368                 }
 369
 370                 if (sign_posn == 0 && (flags & IS_NEGATIVE))
 371                         PRINT(')');
 372
 373                 if (dst - tmpptr < width) {
 374                         if (flags & LEFT_JUSTIFY) {
 375                                 while (dst - tmpptr < width)
 376                                         PRINT(' ');
 377                         } else {
 378                                 pad_size = dst-tmpptr;
 379                                 (void) memmove(tmpptr + width-pad_size, tmpptr,
 380                                     pad_size);
 381                                 (void) memset(tmpptr, ' ', width-pad_size);
 382                                 dst += width-pad_size;
 383                         }
 384                 }
 385         }
 386
 387         PRINT('\0');
 388         free(asciivalue);
 389         return (dst - s - 1);   /* size of put data except trailing '\0' */
 390
 391 e2big_error:
 392         errno = E2BIG;
 393         goto end_error;
 394
 395 format_error:
 396         errno = EINVAL;
 397
 398 end_error:
 399         sverrno = errno;
 400         if (asciivalue != NULL)
 401                 free(asciivalue);
 402         errno = sverrno;
 403         return (-1);
 404 }
 405
 406 ssize_t
 407 strfmon(char *_RESTRICT_KYWD s, size_t maxsize,
 408     const char *_RESTRICT_KYWD format, ...)
 409 {
 410         va_list ap;
 411         ssize_t ret;
 412
 413         va_start(ap, format);
 414         ret = strfmon_impl(s, maxsize, uselocale(NULL), format, ap);
 415         va_end(ap);
 416         return (ret);
 417 }
 418
 419 ssize_t
 420 strfmon_l(char *_RESTRICT_KYWD s, size_t maxsize, locale_t loc,
 421     const char *_RESTRICT_KYWD format, ...)
 422 {
 423         ssize_t ret;
 424         va_list ap;
 425         va_start(ap, format);
 426         ret = strfmon_impl(s, maxsize, loc, format, ap);
 427         va_end(ap);
 428         return (ret);
 429 }
 430
 431 static void
 432 setup_vars(const struct lc_monetary *lmon, int flags, char *cs_precedes,
 433     char *sep_by_space, char *sign_posn, const char **signstr)
 434 {
 435         if ((flags & IS_NEGATIVE) && (flags & USE_INTL_CURRENCY)) {
 436                 *cs_precedes = lmon->int_n_cs_precedes[0];
 437                 *sep_by_space = lmon->int_n_sep_by_space[0];
 438                 *sign_posn = (flags & PARENTH_POSN) ? 0 :
 439                     lmon->int_n_sign_posn[0];
 440                 *signstr = (lmon->negative_sign[0] == '\0') ? "-" :
 441                     lmon->negative_sign;
 442         } else if (flags & USE_INTL_CURRENCY) {
 443                 *cs_precedes = lmon->int_p_cs_precedes[0];
 444                 *sep_by_space = lmon->int_p_sep_by_space[0];
 445                 *sign_posn = (flags & PARENTH_POSN) ? 0 :
 446                     lmon->int_p_sign_posn[0];
 447                 *signstr = lmon->positive_sign;
 448         } else if (flags & IS_NEGATIVE) {
 449                 *cs_precedes = lmon->n_cs_precedes[0];
 450                 *sep_by_space = lmon->n_sep_by_space[0];
 451                 *sign_posn = (flags & PARENTH_POSN) ? 0 : lmon->n_sign_posn[0];
 452                 *signstr = (lmon->negative_sign[0] == '\0') ? "-" :
 453                     lmon->negative_sign;
 454         } else {
 455                 *cs_precedes = lmon->p_cs_precedes[0];
 456                 *sep_by_space = lmon->p_sep_by_space[0];
 457                 *sign_posn = (flags & PARENTH_POSN) ? 0 : lmon->p_sign_posn[0];
 458                 *signstr = lmon->positive_sign;
 459         }
 460
 461         /* Set default values for unspecified information. */
 462         if (*cs_precedes != 0)
 463                 *cs_precedes = 1;
 464         if (*sep_by_space == CHAR_MAX)
 465                 *sep_by_space = 0;
 466         if (*sign_posn == CHAR_MAX)
 467                 *sign_posn = 0;
 468 }
 469
 470 static int
 471 calc_left_pad(const struct lc_monetary *lmon, int flags, const char *cur_symb)
 472 {
 473         char cs_precedes, sep_by_space, sign_posn;
 474         const char *signstr;
 475         int left_chars = 0;
 476
 477         setup_vars(lmon, flags, &cs_precedes, &sep_by_space, &sign_posn,
 478             &signstr);
 479
 480         if (cs_precedes != 0) {
 481                 left_chars += strlen(cur_symb);
 482                 if (sep_by_space != 0)
 483                         left_chars++;
 484         }
 485
 486         switch (sign_posn) {
 487                 case 1:
 488                         left_chars += strlen(signstr);
 489                         break;
 490                 case 3:
 491                 case 4:
 492                         if (cs_precedes != 0)
 493                                 left_chars += strlen(signstr);
 494         }
 495         return (left_chars);
 496 }
 497
 498 static int
 499 get_groups(int size, const char *grouping)
 500 {
 501
 502         int     chars = 0;
 503
 504         if (*grouping == CHAR_MAX || *grouping <= 0)    /* no grouping ? */
 505                 return (0);
 506
 507         while (size > (int)*grouping) {
 508                 chars++;
 509                 size -= (int)*grouping++;
 510                 /* no more grouping ? */
 511                 if (*grouping == CHAR_MAX)
 512                         break;
 513                 /* rest grouping with same value ? */
 514                 if (*grouping == 0) {
 515                         chars += (size - 1) / *(grouping - 1);
 516                         break;
 517                 }
 518         }
 519         return (chars);
 520 }
 521
 522 /* convert double to ASCII */
 523 static char *
 524 format_grouped_double(const struct lc_monetary *lmon,
 525     const struct lc_numeric *lnum,
 526     double value, int *flags, int left_prec, int right_prec, int pad_char)
 527 {
 528
 529         char            *rslt;
 530         char            *avalue;
 531         int             avalue_size;
 532         char            fmt[32];
 533
 534         size_t          bufsize;
 535         char            *bufend;
 536
 537         int             padded;
 538
 539         const char      *grouping;
 540         const char      *decimal_point;
 541         const char      *thousands_sep;
 542         int             decimal_len;
 543         int             thousands_len;
 544
 545         int groups = 0;
 546
 547         grouping = lmon->mon_grouping;
 548         decimal_point = lmon->mon_decimal_point;
 549         if (*decimal_point == '\0')
 550                 decimal_point = lnum->decimal_point;
 551         thousands_sep = lmon->mon_thousands_sep;
 552         if (*thousands_sep == '\0')
 553                 thousands_sep = lnum->thousands_sep;
 554
 555         decimal_len = strlen(decimal_point);    /* usually 1 */
 556         thousands_len = strlen(thousands_sep);  /* 0 or 1 usually */
 557
 558         /* fill left_prec with default value */
 559         if (left_prec == -1)
 560                 left_prec = 0;
 561
 562         /* fill right_prec with default value */
 563         if (right_prec == -1) {
 564                 if (*flags & USE_INTL_CURRENCY)
 565                         right_prec = lmon->int_frac_digits[0];
 566                 else
 567                         right_prec = lmon->frac_digits[0];
 568
 569                 if (right_prec == CHAR_MAX)     /* POSIX locale ? */
 570                         right_prec = 2;
 571         }
 572
 573         if (*flags & NEED_GROUPING)
 574                 left_prec += get_groups(left_prec, grouping);
 575
 576         /* convert to string */
 577         (void) snprintf(fmt, sizeof (fmt), "%%%d.%df",
 578             left_prec + right_prec + 1, right_prec);
 579         avalue_size = asprintf(&avalue, fmt, value);
 580         if (avalue_size < 0)
 581                 return (NULL);
 582
 583         /*
 584          * Make sure that we've enough space for result string.
 585          * This assumes that digits take up at least much space as
 586          * grouping and radix characters.  The worst case currently known
 587          * is for Arabic, where two-byte UTF-8 sequences are used for both
 588          * decimal and thousands seperators, and groups can be a small as two
 589          * decimal digits.  This will do no worse than doubling the storage
 590          * requirement.
 591          */
 592         bufsize = strlen(avalue)*2+1;
 593         rslt = calloc(1, bufsize);
 594         if (rslt == NULL) {
 595                 free(avalue);
 596                 return (NULL);
 597         }
 598         bufend = rslt + bufsize - 1;    /* reserve space for trailing '\0' */
 599
 600         /* skip spaces at beginning */
 601         padded = 0;
 602         while (avalue[padded] == ' ') {
 603                 padded++;
 604                 avalue_size--;
 605         }
 606
 607         if (right_prec > 0) {
 608                 bufend -= right_prec;
 609                 (void) memcpy(bufend, avalue + avalue_size+padded-right_prec,
 610                     right_prec);
 611                 bufend -= decimal_len;
 612                 (void) memcpy(bufend, decimal_point, decimal_len);
 613                 avalue_size -= (right_prec + decimal_len);
 614         }
 615
 616         if ((*flags & NEED_GROUPING) &&
 617             thousands_len != 0 &&
 618             *grouping != CHAR_MAX &&
 619             *grouping > 0) {
 620                 while (avalue_size > (int)*grouping) {
 621                         GRPCPY(*grouping);
 622                         GRPSEP;
 623                         grouping++;
 624
 625                         /* no more grouping ? */
 626                         if (*grouping == CHAR_MAX)
 627                                 break;
 628
 629                         /* rest grouping with same value ? */
 630                         if (*grouping == 0) {
 631                                 grouping--;
 632                                 while (avalue_size > *grouping) {
 633                                         GRPCPY(*grouping);
 634                                         GRPSEP;
 635                                 }
 636                         }
 637                 }
 638                 if (avalue_size != 0)
 639                         GRPCPY(avalue_size);
 640                 padded -= groups;
 641
 642         } else {
 643                 bufend -= avalue_size;
 644                 (void) memcpy(bufend, avalue+padded, avalue_size);
 645                 if (right_prec == 0)
 646                         padded--;       /* decrease assumed $decimal_point */
 647         }
 648
 649         /* do padding with pad_char */
 650         if (padded > 0) {
 651                 bufend -= padded;
 652                 (void) memset(bufend, pad_char, padded);
 653         }
 654
 655         bufsize = bufsize - (bufend - rslt) + 1;
 656         (void) memmove(rslt, bufend, bufsize);
 657         free(avalue);
 658         return (rslt);
 659 }