lib/libc/stdlib/strfmon.c

   1 /*-
   2  * Copyright (c) 2001 Alexey Zelkin <phantom@FreeBSD.org>
   3  * All rights reserved.
   4  *
   5  * Copyright (c) 2011 The FreeBSD Foundation
   6  * All rights reserved.
   7  * Portions of this software were developed by David Chisnall
   8  * under sponsorship from the FreeBSD Foundation.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  * $FreeBSD: head/lib/libc/stdlib/strfmon.c 227753 2011-11-20 14:45:42Z theraven $
  32  */
  33
  34 #include <sys/types.h>
  35 #include <ctype.h>
  36 #include <errno.h>
  37 #include <limits.h>
  38 #include <locale.h>
  39 #include <monetary.h>
  40 #include <stdarg.h>
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include "xlocale_private.h"
  45
  46 /* internal flags */
  47 #define NEED_GROUPING           0x01    /* print digits grouped (default) */
  48 #define SIGN_POSN_USED          0x02    /* '+' or '(' usage flag */
  49 #define LOCALE_POSN             0x04    /* use locale defined +/- (default) */
  50 #define PARENTH_POSN            0x08    /* enclose negative amount in () */
  51 #define SUPRESS_CURR_SYMBOL     0x10    /* supress the currency from output */
  52 #define LEFT_JUSTIFY            0x20    /* left justify */
  53 #define USE_INTL_CURRENCY       0x40    /* use international currency symbol */
  54 #define IS_NEGATIVE             0x80    /* is argument value negative ? */
  55
  56 /* internal macros */
  57 #define PRINT(CH) do {                                          \
  58         if (dst >= s + maxsize)                                 \
  59                 goto e2big_error;                               \
  60         *dst++ = CH;                                            \
  61 } while (0)
  62
  63 #define PRINTS(STR) do {                                        \
  64         char *tmps = STR;                                       \
  65         while (*tmps != '\0')                                   \
  66                 PRINT(*tmps++);                                 \
  67 } while (0)
  68
  69 #define GET_NUMBER(VAR) do {                                    \
  70         VAR = 0;                                                \
  71         while (isdigit((unsigned char)*fmt)) {                  \
  72                 if (VAR > INT_MAX / 10)                         \
  73                         goto e2big_error;                       \
  74                 VAR *= 10;                                      \
  75                 VAR += *fmt - '0';                              \
  76                 if (VAR < 0)                                    \
  77                         goto e2big_error;                       \
  78                 fmt++;                                          \
  79         }                                                       \
  80 } while (0)
  81
  82 #define GRPCPY(howmany) do {                                    \
  83         int i = howmany;                                        \
  84         while (i-- > 0) {                                       \
  85                 avalue_size--;                                  \
  86                 *--bufend = *(avalue+avalue_size+padded);       \
  87         }                                                       \
  88 } while (0)
  89
  90 #define GRPSEP do {                                             \
  91         *--bufend = thousands_sep;                              \
  92         groups++;                                               \
  93 } while (0)
  94
  95 static void __setup_vars(int, char *, char *, char *, char **);
  96 static int __calc_left_pad(int, char *);
  97 static char *__format_grouped_double(double, int *, int, int, int);
  98
  99 static ssize_t
 100 vstrfmon_l(char * __restrict s, size_t maxsize, locale_t loc,
 101                 const char * __restrict format, va_list ap)
 102 {
 103         char            *dst;           /* output destination pointer */
 104         const char      *fmt;           /* current format poistion pointer */
 105         struct lconv    *lc;            /* pointer to lconv structure */
 106         char            *asciivalue;    /* formatted double pointer */
 107
 108         int             flags;          /* formatting options */
 109         int             pad_char;       /* padding character */
 110         int             pad_size;       /* pad size */
 111         int             width;          /* field width */
 112         int             left_prec;      /* left precision */
 113         int             right_prec;     /* right precision */
 114         double          value;          /* just value */
 115         char            space_char = ' '; /* space after currency */
 116
 117         char            cs_precedes,    /* values gathered from struct lconv */
 118                         sep_by_space,
 119                         sign_posn,
 120                         *signstr,
 121                         *currency_symbol;
 122
 123         char            *tmpptr;        /* temporary vars */
 124         int             sverrno;
 125         FIX_LOCALE(loc);
 126
 127
 128         lc = localeconv_l(loc);
 129         dst = s;
 130         fmt = format;
 131         asciivalue = NULL;
 132         currency_symbol = NULL;
 133         pad_size = 0;
 134
 135         while (*fmt) {
 136                 /* pass nonformating characters AS IS */
 137                 if (*fmt != '%')
 138                         goto literal;
 139
 140                 /* '%' found ! */
 141
 142                 /* "%%" mean just '%' */
 143                 if (*(fmt+1) == '%') {
 144                         fmt++;
 145         literal:
 146                         PRINT(*fmt++);
 147                         continue;
 148                 }
 149
 150                 /* set up initial values */
 151                 flags = (NEED_GROUPING|LOCALE_POSN);
 152                 pad_char = ' ';         /* padding character is "space" */
 153                 left_prec = -1;         /* no left precision specified */
 154                 right_prec = -1;        /* no right precision specified */
 155                 width = -1;             /* no width specified */
 156                 value = 0;              /* we have no value to print now */
 157
 158                 /* Flags */
 159                 while (1) {
 160                         switch (*++fmt) {
 161                                 case '=':       /* fill character */
 162                                         pad_char = *++fmt;
 163                                         if (pad_char == '\0')
 164                                                 goto format_error;
 165                                         continue;
 166                                 case '^':       /* not group currency  */
 167                                         flags &= ~(NEED_GROUPING);
 168                                         continue;
 169                                 case '+':       /* use locale defined signs */
 170                                         if (flags & SIGN_POSN_USED)
 171                                                 goto format_error;
 172                                         flags |= (SIGN_POSN_USED|LOCALE_POSN);
 173                                         continue;
 174                                 case '(':       /* enclose negatives with () */
 175                                         if (flags & SIGN_POSN_USED)
 176                                                 goto format_error;
 177                                         flags |= (SIGN_POSN_USED|PARENTH_POSN);
 178                                         continue;
 179                                 case '!':       /* suppress currency symbol */
 180                                         flags |= SUPRESS_CURR_SYMBOL;
 181                                         continue;
 182                                 case '-':       /* alignment (left)  */
 183                                         flags |= LEFT_JUSTIFY;
 184                                         continue;
 185                                 default:
 186                                         break;
 187                         }
 188                         break;
 189                 }
 190
 191                 /* field Width */
 192                 if (isdigit((unsigned char)*fmt)) {
 193                         GET_NUMBER(width);
 194                         /* Do we have enough space to put number with
 195                          * required width ?
 196                          */
 197                         if ((unsigned int)width >= maxsize - (dst - s))
 198                                 goto e2big_error;
 199                 }
 200
 201                 /* Left precision */
 202                 if (*fmt == '#') {
 203                         if (!isdigit((unsigned char)*++fmt))
 204                                 goto format_error;
 205                         GET_NUMBER(left_prec);
 206                         if ((unsigned int)left_prec >= maxsize - (dst - s))
 207                                 goto e2big_error;
 208                 }
 209
 210                 /* Right precision */
 211                 if (*fmt == '.') {
 212                         if (!isdigit((unsigned char)*++fmt))
 213                                 goto format_error;
 214                         GET_NUMBER(right_prec);
 215                         if ((unsigned int)right_prec >= maxsize - (dst - s) -
 216                             left_prec)
 217                                 goto e2big_error;
 218                 }
 219
 220                 /* Conversion Characters */
 221                 switch (*fmt++) {
 222                         case 'i':       /* use internaltion currency format */
 223                                 flags |= USE_INTL_CURRENCY;
 224                                 break;
 225                         case 'n':       /* use national currency format */
 226                                 flags &= ~(USE_INTL_CURRENCY);
 227                                 break;
 228                         default:        /* required character is missing or
 229                                            premature EOS */
 230                                 goto format_error;
 231                 }
 232
 233                 if (currency_symbol != NULL)
 234                         free(currency_symbol);
 235                 if (flags & USE_INTL_CURRENCY) {
 236                         currency_symbol = strdup(lc->int_curr_symbol);
 237                         if (currency_symbol != NULL)
 238                                 space_char = *(currency_symbol+3);
 239                 } else
 240                         currency_symbol = strdup(lc->currency_symbol);
 241
 242                 if (currency_symbol == NULL)
 243                         goto end_error;                 /* ENOMEM. */
 244
 245                 /* value itself */
 246                 value = va_arg(ap, double);
 247
 248                 /* detect sign */
 249                 if (value < 0) {
 250                         flags |= IS_NEGATIVE;
 251                         value = -value;
 252                 }
 253
 254                 /* fill left_prec with amount of padding chars */
 255                 if (left_prec >= 0) {
 256                         pad_size = __calc_left_pad((flags ^ IS_NEGATIVE),
 257                                                         currency_symbol) -
 258                                    __calc_left_pad(flags, currency_symbol);
 259                         if (pad_size < 0)
 260                                 pad_size = 0;
 261                 }
 262
 263                 if (asciivalue != NULL)
 264                         free(asciivalue);
 265                 asciivalue = __format_grouped_double(value, &flags,
 266                                 left_prec, right_prec, pad_char);
 267                 if (asciivalue == NULL)
 268                         goto end_error;         /* errno already set     */
 269                                                 /* to ENOMEM by malloc() */
 270
 271                 /* set some variables for later use */
 272                 __setup_vars(flags, &cs_precedes, &sep_by_space,
 273                                 &sign_posn, &signstr);
 274
 275                 /*
 276                  * Description of some LC_MONETARY's values:
 277                  *
 278                  * p_cs_precedes & n_cs_precedes
 279                  *
 280                  * = 1 - $currency_symbol precedes the value
 281                  *       for a monetary quantity with a non-negative value
 282                  * = 0 - symbol succeeds the value
 283                  *
 284                  * p_sep_by_space & n_sep_by_space
 285                  *
 286                  * = 0 - no space separates $currency_symbol
 287                  *       from the value for a monetary quantity with a
 288                  *       non-negative value
 289                  * = 1 - space separates the symbol from the value
 290                  * = 2 - space separates the symbol and the sign string,
 291                  *       if adjacent.
 292                  *
 293                  * p_sign_posn & n_sign_posn
 294                  *
 295                  * = 0 - parentheses enclose the quantity and the
 296                  *       $currency_symbol
 297                  * = 1 - the sign string precedes the quantity and the
 298                  *       $currency_symbol
 299                  * = 2 - the sign string succeeds the quantity and the
 300                  *       $currency_symbol
 301                  * = 3 - the sign string precedes the $currency_symbol
 302                  * = 4 - the sign string succeeds the $currency_symbol
 303                  *
 304                  */
 305
 306                 tmpptr = dst;
 307
 308                 while (pad_size-- > 0)
 309                         PRINT(' ');
 310
 311                 if (sign_posn == 0 && (flags & IS_NEGATIVE))
 312                         PRINT('(');
 313
 314                 if (cs_precedes == 1) {
 315                         if (sign_posn == 1 || sign_posn == 3) {
 316                                 PRINTS(signstr);
 317                                 if (sep_by_space == 2)          /* XXX: ? */
 318                                         PRINT(' ');
 319                         }
 320
 321                         if (!(flags & SUPRESS_CURR_SYMBOL)) {
 322                                 PRINTS(currency_symbol);
 323
 324                                 if (sign_posn == 4) {
 325                                         if (sep_by_space == 2)
 326                                                 PRINT(space_char);
 327                                         PRINTS(signstr);
 328                                         if (sep_by_space == 1)
 329                                                 PRINT(' ');
 330                                 } else if (sep_by_space == 1)
 331                                         PRINT(space_char);
 332                         }
 333                 } else if (sign_posn == 1)
 334                         PRINTS(signstr);
 335
 336                 PRINTS(asciivalue);
 337
 338                 if (cs_precedes == 0) {
 339                         if (sign_posn == 3) {
 340                                 if (sep_by_space == 1)
 341                                         PRINT(' ');
 342                                 PRINTS(signstr);
 343                         }
 344
 345                         if (!(flags & SUPRESS_CURR_SYMBOL)) {
 346                                 if ((sign_posn == 3 && sep_by_space == 2)
 347                                     || (sep_by_space == 1
 348                                     && (sign_posn == 0
 349                                     || sign_posn == 1
 350                                     || sign_posn == 2
 351                                     || sign_posn == 4)))
 352                                         PRINT(space_char);
 353                                 PRINTS(currency_symbol); /* XXX: len */
 354                                 if (sign_posn == 4) {
 355                                         if (sep_by_space == 2)
 356                                                 PRINT(' ');
 357                                         PRINTS(signstr);
 358                                 }
 359                         }
 360                 }
 361
 362                 if (sign_posn == 2) {
 363                         if (sep_by_space == 2)
 364                                 PRINT(' ');
 365                         PRINTS(signstr);
 366                 }
 367
 368                 if (sign_posn == 0 && (flags & IS_NEGATIVE))
 369                         PRINT(')');
 370
 371                 if (dst - tmpptr < width) {
 372                         if (flags & LEFT_JUSTIFY) {
 373                                 while (dst - tmpptr < width)
 374                                         PRINT(' ');
 375                         } else {
 376                                 pad_size = dst-tmpptr;
 377                                 memmove(tmpptr + width-pad_size, tmpptr,
 378                                     pad_size);
 379                                 memset(tmpptr, ' ', width-pad_size);
 380                                 dst += width-pad_size;
 381                         }
 382                 }
 383         }
 384
 385         PRINT('\0');
 386         free(asciivalue);
 387         free(currency_symbol);
 388         return (dst - s - 1);   /* return size of put data except trailing '\0' */
 389
 390 e2big_error:
 391         errno = E2BIG;
 392         goto end_error;
 393
 394 format_error:
 395         errno = EINVAL;
 396
 397 end_error:
 398         sverrno = errno;
 399         if (asciivalue != NULL)
 400                 free(asciivalue);
 401         if (currency_symbol != NULL)
 402                 free(currency_symbol);
 403         errno = sverrno;
 404         return (-1);
 405 }
 406 ssize_t
 407 strfmon_l(char * __restrict s, size_t maxsize, locale_t loc, const char * __restrict format,
 408     ...)
 409 {
 410         size_t ret;
 411         va_list ap;
 412         va_start(ap, format);
 413         ret = vstrfmon_l(s, maxsize, loc, format, ap);
 414         va_end(ap);
 415         return ret;
 416 }
 417
 418 ssize_t
 419 strfmon(char * __restrict s, size_t maxsize, const char * __restrict format,
 420     ...)
 421 {
 422         size_t ret;
 423         va_list ap;
 424         va_start(ap, format);
 425         ret = vstrfmon_l(s, maxsize, __get_locale(), format, ap);
 426         va_end(ap);
 427         return ret;
 428 }
 429
 430
 431 static void
 432 __setup_vars(int flags, char *cs_precedes, char *sep_by_space,
 433                 char *sign_posn, char **signstr) {
 434
 435         struct lconv *lc = localeconv();
 436
 437         if ((flags & IS_NEGATIVE) && (flags & USE_INTL_CURRENCY)) {
 438                 *cs_precedes = lc->int_n_cs_precedes;
 439                 *sep_by_space = lc->int_n_sep_by_space;
 440                 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->int_n_sign_posn;
 441                 *signstr = (lc->negative_sign[0] == '\0') ? "-"
 442                     : lc->negative_sign;
 443         } else if (flags & USE_INTL_CURRENCY) {
 444                 *cs_precedes = lc->int_p_cs_precedes;
 445                 *sep_by_space = lc->int_p_sep_by_space;
 446                 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->int_p_sign_posn;
 447                 *signstr = lc->positive_sign;
 448         } else if (flags & IS_NEGATIVE) {
 449                 *cs_precedes = lc->n_cs_precedes;
 450                 *sep_by_space = lc->n_sep_by_space;
 451                 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->n_sign_posn;
 452                 *signstr = (lc->negative_sign[0] == '\0') ? "-"
 453                     : lc->negative_sign;
 454         } else {
 455                 *cs_precedes = lc->p_cs_precedes;
 456                 *sep_by_space = lc->p_sep_by_space;
 457                 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->p_sign_posn;
 458                 *signstr = lc->positive_sign;
 459         }
 460
 461         /* Set defult 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(int flags, char *cur_symb) {
 472
 473         char cs_precedes, sep_by_space, sign_posn, *signstr;
 474         int left_chars = 0;
 475
 476         __setup_vars(flags, &cs_precedes, &sep_by_space, &sign_posn, &signstr);
 477
 478         if (cs_precedes != 0) {
 479                 left_chars += strlen(cur_symb);
 480                 if (sep_by_space != 0)
 481                         left_chars++;
 482         }
 483
 484         switch (sign_posn) {
 485                 case 1:
 486                         left_chars += strlen(signstr);
 487                         break;
 488                 case 3:
 489                 case 4:
 490                         if (cs_precedes != 0)
 491                                 left_chars += strlen(signstr);
 492         }
 493         return (left_chars);
 494 }
 495
 496 static int
 497 get_groups(int size, char *grouping) {
 498
 499         int     chars = 0;
 500
 501         if (*grouping == CHAR_MAX || *grouping <= 0)    /* no grouping ? */
 502                 return (0);
 503
 504         while (size > (int)*grouping) {
 505                 chars++;
 506                 size -= (int)*grouping++;
 507                 /* no more grouping ? */
 508                 if (*grouping == CHAR_MAX)
 509                         break;
 510                 /* rest grouping with same value ? */
 511                 if (*grouping == 0) {
 512                         chars += (size - 1) / *(grouping - 1);
 513                         break;
 514                 }
 515         }
 516         return (chars);
 517 }
 518
 519 /* convert double to ASCII */
 520 static char *
 521 __format_grouped_double(double value, int *flags,
 522                         int left_prec, int right_prec, int pad_char) {
 523
 524         char            *rslt;
 525         char            *avalue;
 526         int             avalue_size;
 527         char            fmt[32];
 528
 529         size_t          bufsize;
 530         char            *bufend;
 531
 532         int             padded;
 533
 534         struct lconv    *lc = localeconv();
 535         char            *grouping;
 536         char            decimal_point;
 537         char            thousands_sep;
 538
 539         int groups = 0;
 540
 541         grouping = lc->mon_grouping;
 542         decimal_point = *lc->mon_decimal_point;
 543         if (decimal_point == '\0')
 544                 decimal_point = *lc->decimal_point;
 545         thousands_sep = *lc->mon_thousands_sep;
 546         if (thousands_sep == '\0')
 547                 thousands_sep = *lc->thousands_sep;
 548
 549         /* fill left_prec with default value */
 550         if (left_prec == -1)
 551                 left_prec = 0;
 552
 553         /* fill right_prec with default value */
 554         if (right_prec == -1) {
 555                 if (*flags & USE_INTL_CURRENCY)
 556                         right_prec = lc->int_frac_digits;
 557                 else
 558                         right_prec = lc->frac_digits;
 559
 560                 if (right_prec == CHAR_MAX)     /* POSIX locale ? */
 561                         right_prec = 2;
 562         }
 563
 564         if (*flags & NEED_GROUPING)
 565                 left_prec += get_groups(left_prec, grouping);
 566
 567         /* convert to string */
 568         snprintf(fmt, sizeof(fmt), "%%%d.%df", left_prec + right_prec + 1,
 569             right_prec);
 570         avalue_size = asprintf(&avalue, fmt, value);
 571         if (avalue_size < 0)
 572                 return (NULL);
 573
 574         /* make sure that we've enough space for result string */
 575         bufsize = strlen(avalue)*2+1;
 576         rslt = calloc(1, bufsize);
 577         if (rslt == NULL) {
 578                 free(avalue);
 579                 return (NULL);
 580         }
 581         bufend = rslt + bufsize - 1;    /* reserve space for trailing '\0' */
 582
 583         /* skip spaces at beggining */
 584         padded = 0;
 585         while (avalue[padded] == ' ') {
 586                 padded++;
 587                 avalue_size--;
 588         }
 589
 590         if (right_prec > 0) {
 591                 bufend -= right_prec;
 592                 memcpy(bufend, avalue + avalue_size+padded-right_prec,
 593                     right_prec);
 594                 *--bufend = decimal_point;
 595                 avalue_size -= (right_prec + 1);
 596         }
 597
 598         if ((*flags & NEED_GROUPING) &&
 599             thousands_sep != '\0' &&    /* XXX: need investigation */
 600             *grouping != CHAR_MAX &&
 601             *grouping > 0) {
 602                 while (avalue_size > (int)*grouping) {
 603                         GRPCPY(*grouping);
 604                         GRPSEP;
 605                         grouping++;
 606
 607                         /* no more grouping ? */
 608                         if (*grouping == CHAR_MAX)
 609                                 break;
 610
 611                         /* rest grouping with same value ? */
 612                         if (*grouping == 0) {
 613                                 grouping--;
 614                                 while (avalue_size > *grouping) {
 615                                         GRPCPY(*grouping);
 616                                         GRPSEP;
 617                                 }
 618                         }
 619                 }
 620                 if (avalue_size != 0)
 621                         GRPCPY(avalue_size);
 622                 padded -= groups;
 623
 624         } else {
 625                 bufend -= avalue_size;
 626                 memcpy(bufend, avalue+padded, avalue_size);
 627                 if (right_prec == 0)
 628                         padded--;       /* decrease assumed $decimal_point */
 629         }
 630
 631         /* do padding with pad_char */
 632         if (padded > 0) {
 633                 bufend -= padded;
 634                 memset(bufend, pad_char, padded);
 635         }
 636
 637         bufsize = bufsize - (bufend - rslt) + 1;
 638         memmove(rslt, bufend, bufsize);
 639         free(avalue);
 640         return (rslt);
 641 }