1 /* $NetBSD: strfmon.c,v 1.13 2017/11/27 23:54:28 maya Exp $ */ 2 3 /*- 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 #include <sys/cdefs.h> 31 #if defined(LIBC_SCCS) && !defined(lint) 32 #if 0 33 __FBSDID("$FreeBSD: src/lib/libc/stdlib/strfmon.c,v 1.14 2003/03/20 08:18:55 ache Exp $"); 34 #else 35 __RCSID("$NetBSD: strfmon.c,v 1.13 2017/11/27 23:54:28 maya Exp $"); 36 #endif 37 #endif /* LIBC_SCCS and not lint */ 38 39 #include "namespace.h" 40 41 #include <sys/types.h> 42 #include <assert.h> 43 #include <ctype.h> 44 #include <errno.h> 45 #include <limits.h> 46 #include <locale.h> 47 #include <monetary.h> 48 #include <stdarg.h> 49 #include <stddef.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 54 #include "setlocale_local.h" 55 56 /* internal flags */ 57 #define NEED_GROUPING 0x01 /* print digits grouped (default) */ 58 #define SIGN_POSN_USED 0x02 /* '+' or '(' usage flag */ 59 #define LOCALE_POSN 0x04 /* use locale defined +/- (default) */ 60 #define PARENTH_POSN 0x08 /* enclose negative amount in () */ 61 #define SUPRESS_CURR_SYMBOL 0x10 /* supress the currency from output */ 62 #define LEFT_JUSTIFY 0x20 /* left justify */ 63 #define USE_INTL_CURRENCY 0x40 /* use international currency symbol */ 64 #define IS_NEGATIVE 0x80 /* is argument value negative ? */ 65 66 #ifndef NBCHAR_MAX 67 #define NBCHAR_MAX ((unsigned char)CHAR_MAX) 68 #endif 69 70 /* internal macros */ 71 #define PRINT(CH) do { \ 72 if (dst >= s + maxsize) \ 73 goto e2big_error; \ 74 *dst++ = CH; \ 75 } while (/* CONSTCOND */ 0) 76 77 #define PRINTS(STR) do { \ 78 const char *tmps = STR; \ 79 while (*tmps != '\0') \ 80 PRINT(*tmps++); \ 81 } while (/* CONSTCOND */ 0) 82 83 #define GET_NUMBER(VAR) do { \ 84 VAR = 0; \ 85 while (isdigit((unsigned char)*fmt)) { \ 86 VAR *= 10; \ 87 VAR += *fmt - '0'; \ 88 if (VAR > 0x00ffffff) \ 89 goto e2big_error; \ 90 fmt++; \ 91 } \ 92 } while (/* CONSTCOND */ 0) 93 94 #define GRPCPY(howmany) do { \ 95 int i = howmany; \ 96 while (i-- > 0) { \ 97 avalue_size--; \ 98 *--bufend = *(avalue+avalue_size+padded); \ 99 } \ 100 } while (/* CONSTCOND */ 0) 101 102 #define GRPSEP do { \ 103 *--bufend = thousands_sep; \ 104 groups++; \ 105 } while (/* CONSTCOND */ 0) 106 107 static void __setup_vars(struct lconv *, int, char *, char *, char *, const char **); 108 static int __calc_left_pad(struct lconv *, int, char *); 109 static char *__format_grouped_double(struct lconv *, double, int *, int, int, int); 110 111 static ssize_t 112 vstrfmon_l(char * __restrict s, size_t maxsize, locale_t loc, 113 const char * __restrict format, va_list ap) 114 { 115 char *dst; /* output destination pointer */ 116 const char *fmt; /* current format poistion pointer */ 117 struct lconv *lc; /* pointer to lconv structure */ 118 char *asciivalue; /* formatted double pointer */ 119 120 int flags; /* formatting options */ 121 int pad_char; /* padding character */ 122 int pad_size; /* pad size */ 123 int width; /* field width */ 124 int left_prec; /* left precision */ 125 int right_prec; /* right precision */ 126 double value; /* just value */ 127 char space_char = ' '; /* space after currency */ 128 129 char cs_precedes, /* values gathered from struct lconv */ 130 sep_by_space, 131 sign_posn, 132 *currency_symbol; 133 const char *signstr; 134 135 char *tmpptr; /* temporary vars */ 136 int sverrno; 137 138 lc = localeconv_l(loc); 139 dst = s; 140 fmt = format; 141 asciivalue = NULL; 142 currency_symbol = NULL; 143 pad_size = 0; 144 145 while (*fmt) { 146 /* pass nonformating characters AS IS */ 147 if (*fmt != '%') 148 goto literal; 149 150 /* '%' found ! */ 151 152 /* "%%" mean just '%' */ 153 if (*(fmt+1) == '%') { 154 fmt++; 155 literal: 156 PRINT(*fmt++); 157 continue; 158 } 159 160 /* set up initial values */ 161 flags = (NEED_GROUPING|LOCALE_POSN); 162 pad_char = ' '; /* padding character is "space" */ 163 left_prec = -1; /* no left precision specified */ 164 right_prec = -1; /* no right precision specified */ 165 width = -1; /* no width specified */ 166 value = 0; /* we have no value to print now */ 167 168 /* Flags */ 169 while (/* CONSTCOND */ 1) { 170 switch (*++fmt) { 171 case '=': /* fill character */ 172 pad_char = *++fmt; 173 if (pad_char == '\0') 174 goto format_error; 175 continue; 176 case '^': /* not group currency */ 177 flags &= ~(NEED_GROUPING); 178 continue; 179 case '+': /* use locale defined signs */ 180 if (flags & SIGN_POSN_USED) 181 goto format_error; 182 flags |= (SIGN_POSN_USED|LOCALE_POSN); 183 continue; 184 case '(': /* enclose negatives with () */ 185 if (flags & SIGN_POSN_USED) 186 goto format_error; 187 flags |= (SIGN_POSN_USED|PARENTH_POSN); 188 continue; 189 case '!': /* suppress currency symbol */ 190 flags |= SUPRESS_CURR_SYMBOL; 191 continue; 192 case '-': /* alignment (left) */ 193 flags |= LEFT_JUSTIFY; 194 continue; 195 default: 196 break; 197 } 198 break; 199 } 200 201 /* field Width */ 202 if (isdigit((unsigned char)*fmt)) { 203 ptrdiff_t d = dst - s; 204 GET_NUMBER(width); 205 /* Do we have enough space to put number with 206 * required width ? 207 */ 208 209 if ((size_t)(d + width) >= maxsize) 210 goto e2big_error; 211 } 212 213 /* Left precision */ 214 if (*fmt == '#') { 215 if (!isdigit((unsigned char)*++fmt)) 216 goto format_error; 217 GET_NUMBER(left_prec); 218 } 219 220 /* Right precision */ 221 if (*fmt == '.') { 222 if (!isdigit((unsigned char)*++fmt)) 223 goto format_error; 224 GET_NUMBER(right_prec); 225 } 226 227 /* Conversion Characters */ 228 switch (*fmt++) { 229 case 'i': /* use internaltion currency format */ 230 flags |= USE_INTL_CURRENCY; 231 break; 232 case 'n': /* use national currency format */ 233 flags &= ~(USE_INTL_CURRENCY); 234 break; 235 default: /* required character is missing or 236 premature EOS */ 237 goto format_error; 238 } 239 240 if (currency_symbol) 241 free(currency_symbol); 242 if (flags & USE_INTL_CURRENCY) { 243 currency_symbol = strdup(lc->int_curr_symbol); 244 if (currency_symbol != NULL && 245 strlen(currency_symbol) > 3) { 246 space_char = currency_symbol[3]; 247 currency_symbol[3] = '\0'; 248 } 249 250 } else 251 currency_symbol = strdup(lc->currency_symbol); 252 253 if (currency_symbol == NULL) 254 goto end_error; /* ENOMEM. */ 255 256 /* value itself */ 257 value = va_arg(ap, double); 258 259 /* detect sign */ 260 if (value < 0) { 261 flags |= IS_NEGATIVE; 262 value = -value; 263 } 264 265 /* fill left_prec with amount of padding chars */ 266 if (left_prec >= 0) { 267 pad_size = __calc_left_pad(lc, (flags ^ IS_NEGATIVE), 268 currency_symbol) - 269 __calc_left_pad(lc, flags, currency_symbol); 270 if (pad_size < 0) 271 pad_size = 0; 272 } 273 274 asciivalue = __format_grouped_double(lc, value, &flags, 275 left_prec, right_prec, pad_char); 276 if (asciivalue == NULL) 277 goto end_error; /* errno already set */ 278 /* to ENOMEM by malloc() */ 279 280 /* set some variables for later use */ 281 __setup_vars(lc, flags, &cs_precedes, &sep_by_space, 282 &sign_posn, &signstr); 283 284 /* 285 * Description of some LC_MONETARY's values: 286 * 287 * p_cs_precedes & n_cs_precedes 288 * 289 * = 1 - $currency_symbol precedes the value 290 * for a monetary quantity with a non-negative value 291 * = 0 - symbol succeeds the value 292 * 293 * p_sep_by_space & n_sep_by_space 294 * 295 * = 0 - no space separates $currency_symbol 296 * from the value for a monetary quantity with a 297 * non-negative value 298 * = 1 - space separates the symbol from the value 299 * = 2 - space separates the symbol and the sign string, 300 * if adjacent. 301 * 302 * p_sign_posn & n_sign_posn 303 * 304 * = 0 - parentheses enclose the quantity and the 305 * $currency_symbol 306 * = 1 - the sign string precedes the quantity and the 307 * $currency_symbol 308 * = 2 - the sign string succeeds the quantity and the 309 * $currency_symbol 310 * = 3 - the sign string precedes the $currency_symbol 311 * = 4 - the sign string succeeds the $currency_symbol 312 * 313 */ 314 315 tmpptr = dst; 316 317 while (pad_size-- > 0) 318 PRINT(' '); 319 320 if (sign_posn == 0 && (flags & IS_NEGATIVE)) 321 PRINT('('); 322 323 if (cs_precedes == 1) { 324 if (sign_posn == 1 || sign_posn == 3) { 325 PRINTS(signstr); 326 if (sep_by_space == 2) /* XXX: ? */ 327 PRINT(' '); 328 } 329 330 if (!(flags & SUPRESS_CURR_SYMBOL)) { 331 PRINTS(currency_symbol); 332 333 if (sign_posn == 4) { 334 if (sep_by_space == 2) 335 PRINT(space_char); 336 PRINTS(signstr); 337 if (sep_by_space == 1) 338 PRINT(' '); 339 } else if (sep_by_space == 1) 340 PRINT(space_char); 341 } 342 } else if (sign_posn == 1) 343 PRINTS(signstr); 344 345 PRINTS(asciivalue); 346 347 if (cs_precedes == 0) { 348 if (sign_posn == 3) { 349 if (sep_by_space == 1) 350 PRINT(' '); 351 PRINTS(signstr); 352 } 353 354 if (!(flags & SUPRESS_CURR_SYMBOL)) { 355 if ((sign_posn == 3 && sep_by_space == 2) 356 || (sep_by_space == 1 357 && (sign_posn == 0 358 || sign_posn == 1 359 || sign_posn == 2 360 || sign_posn == 4))) 361 PRINT(space_char); 362 PRINTS(currency_symbol); /* XXX: len */ 363 if (sign_posn == 4) { 364 if (sep_by_space == 2) 365 PRINT(' '); 366 PRINTS(signstr); 367 } 368 } 369 } 370 371 if (sign_posn == 2) { 372 if (sep_by_space == 2) 373 PRINT(' '); 374 PRINTS(signstr); 375 } 376 377 if (sign_posn == 0 && (flags & IS_NEGATIVE)) 378 PRINT(')'); 379 380 if (dst - tmpptr < width) { 381 if (flags & LEFT_JUSTIFY) { 382 while (dst - tmpptr < width) 383 PRINT(' '); 384 } else { 385 _DIAGASSERT(__type_fit(int, dst - tmpptr)); 386 pad_size = dst - tmpptr; 387 memmove(tmpptr + width-pad_size, tmpptr, 388 (size_t) pad_size); 389 memset(tmpptr, ' ', (size_t) width-pad_size); 390 dst += width-pad_size; 391 } 392 } 393 } 394 395 PRINT('\0'); 396 free(asciivalue); 397 free(currency_symbol); 398 return (dst - s - 1); /* return size of put data except trailing '\0' */ 399 400 e2big_error: 401 errno = E2BIG; 402 goto end_error; 403 404 format_error: 405 errno = EINVAL; 406 407 end_error: 408 sverrno = errno; 409 if (asciivalue != NULL) 410 free(asciivalue); 411 if (currency_symbol != NULL) 412 free(currency_symbol); 413 errno = sverrno; 414 return (-1); 415 } 416 417 static void 418 __setup_vars(struct lconv *lc, int flags, char *cs_precedes, char *sep_by_space, 419 char *sign_posn, const char **signstr) { 420 421 if ((flags & IS_NEGATIVE) && (flags & USE_INTL_CURRENCY)) { 422 *cs_precedes = lc->int_n_cs_precedes; 423 *sep_by_space = lc->int_n_sep_by_space; 424 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->int_n_sign_posn; 425 *signstr = (*lc->negative_sign == '\0') ? "-" 426 : lc->negative_sign; 427 } else if (flags & USE_INTL_CURRENCY) { 428 *cs_precedes = lc->int_p_cs_precedes; 429 *sep_by_space = lc->int_p_sep_by_space; 430 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->int_p_sign_posn; 431 *signstr = lc->positive_sign; 432 } else if (flags & IS_NEGATIVE) { 433 *cs_precedes = lc->n_cs_precedes; 434 *sep_by_space = lc->n_sep_by_space; 435 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->n_sign_posn; 436 *signstr = (*lc->negative_sign == '\0') ? "-" 437 : lc->negative_sign; 438 } else { 439 *cs_precedes = lc->p_cs_precedes; 440 *sep_by_space = lc->p_sep_by_space; 441 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->p_sign_posn; 442 *signstr = lc->positive_sign; 443 } 444 445 /* Set default values for unspecified information. */ 446 if (*cs_precedes != 0) 447 *cs_precedes = 1; 448 if ((unsigned char)*sep_by_space == NBCHAR_MAX) 449 *sep_by_space = 1; 450 if ((unsigned char)*sign_posn == NBCHAR_MAX) 451 *sign_posn = 0; 452 } 453 454 static int 455 __calc_left_pad(struct lconv *lc, int flags, char *cur_symb) { 456 457 char cs_precedes, sep_by_space, sign_posn; 458 const char *signstr; 459 size_t left_chars = 0; 460 461 __setup_vars(lc, flags, &cs_precedes, &sep_by_space, &sign_posn, &signstr); 462 463 if (cs_precedes != 0) { 464 left_chars += strlen(cur_symb); 465 if (sep_by_space != 0) 466 left_chars++; 467 } 468 469 switch (sign_posn) { 470 case 1: 471 left_chars += strlen(signstr); 472 break; 473 case 3: 474 case 4: 475 if (cs_precedes != 0) 476 left_chars += strlen(signstr); 477 } 478 _DIAGASSERT(__type_fit(int, left_chars)); 479 return (int)left_chars; 480 } 481 482 static int 483 get_groups(int size, char *grouping) { 484 485 int chars = 0; 486 487 if ((unsigned char)*grouping == NBCHAR_MAX || *grouping <= 0) /* no grouping ? */ 488 return (0); 489 490 while (size > (int)*grouping) { 491 chars++; 492 size -= (int)*grouping++; 493 /* no more grouping ? */ 494 if ((unsigned char)*grouping == NBCHAR_MAX) 495 break; 496 /* rest grouping with same value ? */ 497 if (*grouping == 0) { 498 chars += (size - 1) / *(grouping - 1); 499 break; 500 } 501 } 502 return (chars); 503 } 504 505 /* convert double to ASCII */ 506 static char * 507 __format_grouped_double(struct lconv *lc, double value, int *flags, 508 int left_prec, int right_prec, int pad_char) { 509 510 char *rslt; 511 char *avalue; 512 int avalue_size; 513 514 size_t bufsize; 515 char *bufend; 516 517 int padded; 518 519 char *grouping; 520 char decimal_point; 521 char thousands_sep; 522 523 int groups = 0; 524 525 grouping = lc->mon_grouping; 526 decimal_point = *lc->mon_decimal_point; 527 if (decimal_point == '\0') 528 decimal_point = *lc->decimal_point; 529 thousands_sep = *lc->mon_thousands_sep; 530 if (thousands_sep == '\0') 531 thousands_sep = *lc->thousands_sep; 532 533 /* fill left_prec with default value */ 534 if (left_prec == -1) 535 left_prec = 0; 536 537 /* fill right_prec with default value */ 538 if (right_prec == -1) { 539 if (*flags & USE_INTL_CURRENCY) 540 right_prec = lc->int_frac_digits; 541 else 542 right_prec = lc->frac_digits; 543 544 if (right_prec == CHAR_MAX) /* POSIX locale ? */ 545 right_prec = 2; 546 } 547 548 if (*flags & NEED_GROUPING) 549 left_prec += get_groups(left_prec, grouping); 550 551 /* convert to string */ 552 avalue_size = asprintf(&avalue, "%*.*f", left_prec + right_prec + 1, 553 right_prec, value); 554 if (avalue_size < 0) 555 return (NULL); 556 557 /* make sure that we've enough space for result string */ 558 bufsize = avalue_size * 2 + 1; 559 rslt = calloc(1, bufsize); 560 if (rslt == NULL) { 561 free(avalue); 562 return (NULL); 563 } 564 bufend = rslt + bufsize - 1; /* reserve space for trailing '\0' */ 565 566 /* skip spaces at beggining */ 567 padded = 0; 568 while (avalue[padded] == ' ') { 569 padded++; 570 avalue_size--; 571 } 572 573 if (right_prec > 0) { 574 bufend -= right_prec; 575 memcpy(bufend, avalue + avalue_size+padded-right_prec, 576 (size_t) right_prec); 577 *--bufend = decimal_point; 578 avalue_size -= (right_prec + 1); 579 } 580 581 /* XXX: Why not use %' instead? */ 582 if ((*flags & NEED_GROUPING) && 583 thousands_sep != '\0' && /* XXX: need investigation */ 584 (unsigned char)*grouping != NBCHAR_MAX && 585 *grouping > 0) { 586 while (avalue_size > (int)*grouping) { 587 GRPCPY(*grouping); 588 GRPSEP; 589 grouping++; 590 591 /* no more grouping ? */ 592 if ((unsigned char)*grouping == NBCHAR_MAX) 593 break; 594 595 /* rest grouping with same value ? */ 596 if (*grouping == 0) { 597 grouping--; 598 while (avalue_size > *grouping) { 599 GRPCPY(*grouping); 600 GRPSEP; 601 } 602 } 603 } 604 if (avalue_size != 0) 605 GRPCPY(avalue_size); 606 padded -= groups; 607 608 } else { 609 bufend -= avalue_size; 610 memcpy(bufend, avalue+padded, (size_t) avalue_size); 611 if (right_prec == 0) 612 padded--; /* decrease assumed $decimal_point */ 613 } 614 615 /* do padding with pad_char */ 616 if (padded > 0) { 617 bufend -= padded; 618 memset(bufend, pad_char, (size_t) padded); 619 } 620 621 memmove(rslt, bufend, bufend - rslt + 1); 622 free(avalue); 623 return (rslt); 624 } 625 626 ssize_t 627 strfmon(char * __restrict s, size_t maxsize, const char * __restrict format, 628 ...) 629 { 630 ssize_t rv; 631 va_list ap; 632 633 va_start(ap, format); 634 rv = vstrfmon_l(s, maxsize, _current_locale(), format, ap); 635 va_end(ap); 636 637 return rv; 638 } 639 640 ssize_t 641 strfmon_l(char * __restrict s, size_t maxsize, locale_t loc, 642 const char * __restrict format, ...) 643 { 644 ssize_t rv; 645 va_list ap; 646 647 va_start(ap, format); 648 rv = vstrfmon_l(s, maxsize, loc, format, ap); 649 va_end(ap); 650 651 return rv; 652 } 653