1 /* $NetBSD: strfmon.c,v 1.22 2025/06/27 19:52:03 andvar Exp $ */ 2 3 /*- 4 * Copyright (c) 2001 Alexey Zelkin <phantom (at) 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 1.22 2025/06/27 19:52:03 andvar 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 SUPPRESS_CURR_SYMBOL 0x10 /* suppress 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 /* internal macros */ 67 #define PRINT(CH) do { \ 68 if (dst >= s + maxsize) \ 69 goto e2big_error; \ 70 *dst++ = CH; \ 71 } while (0) 72 73 #define PRINTS(STR) do { \ 74 const char *tmps = STR; \ 75 while (*tmps != '\0') \ 76 PRINT(*tmps++); \ 77 } while (0) 78 79 #define GET_NUMBER(VAR, LOC) do { \ 80 VAR = 0; \ 81 while (isdigit_l((unsigned char)*fmt, LOC)) { \ 82 if (VAR > INT_MAX / 10) \ 83 goto e2big_error; \ 84 VAR *= 10; \ 85 VAR += *fmt - '0'; \ 86 if (VAR < 0) \ 87 goto e2big_error; \ 88 fmt++; \ 89 } \ 90 } while (0) 91 92 #define GRPCPY(howmany) do { \ 93 int i = howmany; \ 94 while (i-- > 0) { \ 95 avalue_size--; \ 96 *--bufend = *(avalue + avalue_size + padded); \ 97 } \ 98 } while (0) 99 100 #define GRPSEP do { \ 101 bufend -= thousands_sep_size; \ 102 memcpy(bufend, thousands_sep, thousands_sep_size); \ 103 groups++; \ 104 } while (0) 105 106 static void __setup_vars(int, char *, char *, char *, const char **, 107 struct lconv *); 108 static int __calc_left_pad(int, char *, struct lconv *); 109 static char *__format_grouped_double(double, int *, int, int, int, 110 struct lconv *, locale_t loc); 111 112 static ssize_t 113 vstrfmon_l(char * __restrict s, size_t maxsize, locale_t loc, 114 const char * __restrict format, va_list ap) 115 { 116 char *dst; /* output destination pointer */ 117 const char *fmt; /* current format poistion pointer */ 118 struct lconv *lc; /* pointer to lconv structure */ 119 char *asciivalue; /* formatted double pointer */ 120 121 int flags; /* formatting options */ 122 int pad_char; /* padding character */ 123 int pad_size; /* pad size */ 124 int width; /* field width */ 125 int left_prec; /* left precision */ 126 int right_prec; /* right precision */ 127 double value; /* just value */ 128 char space_char = ' '; /* space after currency */ 129 130 char cs_precedes, /* values gathered from struct lconv */ 131 sep_by_space, 132 sign_posn, 133 *currency_symbol; 134 const char *signstr; 135 136 char *tmpptr; /* temporary vars */ 137 int sverrno; 138 139 lc = localeconv_l(loc); 140 dst = s; 141 fmt = format; 142 asciivalue = NULL; 143 currency_symbol = NULL; 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 pad_size = 0; /* no padding initially */ 164 left_prec = -1; /* no left precision specified */ 165 right_prec = -1; /* no right precision specified */ 166 width = -1; /* no width specified */ 167 value = 0; /* we have no value to print now */ 168 169 /* Flags */ 170 while (/* CONSTCOND */ 1) { 171 switch (*++fmt) { 172 case '=': /* fill character */ 173 pad_char = *++fmt; 174 if (pad_char == '\0') 175 goto format_error; 176 continue; 177 case '^': /* not group currency */ 178 flags &= ~(NEED_GROUPING); 179 continue; 180 case '+': /* use locale defined signs */ 181 if (flags & SIGN_POSN_USED) 182 goto format_error; 183 flags |= (SIGN_POSN_USED|LOCALE_POSN); 184 continue; 185 case '(': /* enclose negatives with () */ 186 if (flags & SIGN_POSN_USED) 187 goto format_error; 188 flags |= (SIGN_POSN_USED|PARENTH_POSN); 189 continue; 190 case '!': /* suppress currency symbol */ 191 flags |= SUPPRESS_CURR_SYMBOL; 192 continue; 193 case '-': /* alignment (left) */ 194 flags |= LEFT_JUSTIFY; 195 continue; 196 default: 197 break; 198 } 199 break; 200 } 201 202 /* field Width */ 203 if (isdigit_l((unsigned char)*fmt, loc)) { 204 ptrdiff_t d = dst - s; 205 GET_NUMBER(width, loc); 206 /* Do we have enough space to put number with 207 * required width ? 208 */ 209 210 if ((size_t)(d + width) >= maxsize) 211 goto e2big_error; 212 } 213 214 /* Left precision */ 215 if (*fmt == '#') { 216 if (!isdigit_l((unsigned char)*++fmt, loc)) 217 goto format_error; 218 GET_NUMBER(left_prec, loc); 219 if ((unsigned int)left_prec >= maxsize - (dst - s)) 220 goto e2big_error; 221 } 222 223 /* Right precision */ 224 if (*fmt == '.') { 225 if (!isdigit_l((unsigned char)*++fmt, loc)) 226 goto format_error; 227 GET_NUMBER(right_prec, loc); 228 if ((unsigned int)right_prec >= maxsize - (dst - s) - 229 left_prec) 230 goto e2big_error; 231 } 232 233 /* Conversion Characters */ 234 switch (*fmt++) { 235 case 'i': /* use international currency format */ 236 flags |= USE_INTL_CURRENCY; 237 break; 238 case 'n': /* use national currency format */ 239 flags &= ~(USE_INTL_CURRENCY); 240 break; 241 default: /* required character is missing or 242 premature EOS */ 243 goto format_error; 244 } 245 246 if (currency_symbol != NULL) 247 free(currency_symbol); 248 if (flags & USE_INTL_CURRENCY) { 249 currency_symbol = strdup(lc->int_curr_symbol); 250 if (currency_symbol != NULL && 251 strlen(currency_symbol) > 3) { 252 space_char = currency_symbol[3]; 253 currency_symbol[3] = '\0'; 254 } 255 } else 256 currency_symbol = strdup(lc->currency_symbol); 257 258 if (currency_symbol == NULL) 259 goto end_error; /* ENOMEM. */ 260 261 /* value itself */ 262 value = va_arg(ap, double); 263 264 /* detect sign */ 265 if (value < 0) { 266 flags |= IS_NEGATIVE; 267 value = -value; 268 } 269 270 /* fill left_prec with amount of padding chars */ 271 if (left_prec >= 0) { 272 pad_size = __calc_left_pad((flags ^ IS_NEGATIVE), 273 currency_symbol, lc) - 274 __calc_left_pad(flags, currency_symbol, lc); 275 if (pad_size < 0) 276 pad_size = 0; 277 } 278 279 if (asciivalue != NULL) 280 free(asciivalue); 281 asciivalue = __format_grouped_double(value, &flags, 282 left_prec, right_prec, pad_char, lc, loc); 283 if (asciivalue == NULL) 284 goto end_error; /* errno already set */ 285 /* to ENOMEM by malloc() */ 286 287 /* set some variables for later use */ 288 __setup_vars(flags, &cs_precedes, &sep_by_space, 289 &sign_posn, &signstr, lc); 290 291 /* 292 * Description of some LC_MONETARY's values: 293 * 294 * p_cs_precedes & n_cs_precedes 295 * 296 * = 1 - $currency_symbol precedes the value 297 * for a monetary quantity with a non-negative value 298 * = 0 - symbol succeeds the value 299 * 300 * p_sep_by_space & n_sep_by_space 301 * 302 * = 0 - no space separates $currency_symbol 303 * from the value for a monetary quantity with a 304 * non-negative value 305 * = 1 - space separates the symbol from the value 306 * = 2 - space separates the symbol and the sign string, 307 * if adjacent. 308 * 309 * p_sign_posn & n_sign_posn 310 * 311 * = 0 - parentheses enclose the quantity and the 312 * $currency_symbol 313 * = 1 - the sign string precedes the quantity and the 314 * $currency_symbol 315 * = 2 - the sign string succeeds the quantity and the 316 * $currency_symbol 317 * = 3 - the sign string precedes the $currency_symbol 318 * = 4 - the sign string succeeds the $currency_symbol 319 * 320 */ 321 322 tmpptr = dst; 323 324 while (pad_size-- > 0) 325 PRINT(' '); 326 327 if (sign_posn == 0 && (flags & IS_NEGATIVE)) 328 PRINT('('); 329 330 if (cs_precedes == 1) { 331 if (sign_posn == 1 || sign_posn == 3) { 332 PRINTS(signstr); 333 if (sep_by_space == 2) /* XXX: ? */ 334 PRINT(' '); 335 } 336 337 if (!(flags & SUPPRESS_CURR_SYMBOL)) { 338 PRINTS(currency_symbol); 339 340 if (sign_posn == 4) { 341 if (sep_by_space == 2) 342 PRINT(space_char); 343 PRINTS(signstr); 344 if (sep_by_space == 1) 345 PRINT(' '); 346 } else if (sep_by_space == 1) 347 PRINT(space_char); 348 } 349 } else if (sign_posn == 1) { 350 PRINTS(signstr); 351 if (sep_by_space == 2) 352 PRINT(' '); 353 } 354 355 PRINTS(asciivalue); 356 357 if (cs_precedes == 0) { 358 if (sign_posn == 3) { 359 if (sep_by_space == 1) 360 PRINT(' '); 361 PRINTS(signstr); 362 } 363 364 if (!(flags & SUPPRESS_CURR_SYMBOL)) { 365 if ((sign_posn == 3 && sep_by_space == 2) 366 || (sep_by_space == 1 367 && (sign_posn == 0 368 || sign_posn == 1 369 || sign_posn == 2 370 || sign_posn == 4))) 371 PRINT(space_char); 372 PRINTS(currency_symbol); /* XXX: len */ 373 if (sign_posn == 4) { 374 if (sep_by_space == 2) 375 PRINT(' '); 376 PRINTS(signstr); 377 } 378 } 379 } 380 381 if (sign_posn == 2) { 382 if (sep_by_space == 2) 383 PRINT(' '); 384 PRINTS(signstr); 385 } 386 387 if (sign_posn == 0) { 388 if (flags & IS_NEGATIVE) 389 PRINT(')'); 390 else if (left_prec >= 0) 391 PRINT(' '); 392 } 393 394 if (dst - tmpptr < width) { 395 if (flags & LEFT_JUSTIFY) { 396 while (dst - tmpptr < width) 397 PRINT(' '); 398 } else { 399 size_t wps; 400 _DIAGASSERT(__type_fit(int, dst - tmpptr)); 401 pad_size = (int)(dst - tmpptr); 402 wps = width - pad_size; 403 memmove(tmpptr + wps, tmpptr, (size_t)pad_size); 404 memset(tmpptr, ' ', wps); 405 dst += wps; 406 } 407 } 408 } 409 410 PRINT('\0'); 411 free(asciivalue); 412 free(currency_symbol); 413 return (dst - s - 1); /* return size of put data except trailing '\0' */ 414 415 e2big_error: 416 errno = E2BIG; 417 goto end_error; 418 419 format_error: 420 errno = EINVAL; 421 422 end_error: 423 sverrno = errno; 424 if (asciivalue != NULL) 425 free(asciivalue); 426 if (currency_symbol != NULL) 427 free(currency_symbol); 428 errno = sverrno; 429 return (-1); 430 } 431 432 static void 433 __setup_vars(int flags, char *cs_precedes, char *sep_by_space, 434 char *sign_posn, const char **signstr, struct lconv *lc) 435 { 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 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(int flags, char *cur_symb, struct lconv *lc) 472 { 473 char cs_precedes, sep_by_space, sign_posn; 474 const char *signstr; 475 size_t left_chars = 0; 476 477 __setup_vars(flags, &cs_precedes, &sep_by_space, &sign_posn, 478 &signstr, lc); 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 0: 488 if (flags & IS_NEGATIVE) 489 left_chars++; 490 break; 491 case 1: 492 left_chars += strlen(signstr); 493 break; 494 case 3: 495 case 4: 496 if (cs_precedes != 0) 497 left_chars += strlen(signstr); 498 } 499 _DIAGASSERT(__type_fit(int, left_chars)); 500 return (int)left_chars; 501 } 502 503 static int 504 get_groups(int size, char *grouping) 505 { 506 int chars = 0; 507 508 if (*grouping == CHAR_MAX || *grouping <= 0) /* no grouping ? */ 509 return (0); 510 511 while (size > (int)*grouping) { 512 chars++; 513 size -= (int)*grouping++; 514 /* no more grouping ? */ 515 if (*grouping == CHAR_MAX) 516 break; 517 /* rest grouping with same value ? */ 518 if (*grouping == 0) { 519 chars += (size - 1) / *(grouping - 1); 520 break; 521 } 522 } 523 return (chars); 524 } 525 526 /* convert double to locale-encoded string */ 527 static char * 528 __format_grouped_double(double value, int *flags, int left_prec, 529 int right_prec, int pad_char, struct lconv *lc, locale_t loc) 530 { 531 532 char *rslt; 533 char *avalue; 534 int avalue_size; 535 536 size_t bufsize; 537 char *bufend; 538 539 int padded; 540 541 char *grouping; 542 const char *decimal_point; 543 const char *thousands_sep; 544 size_t decimal_point_size; 545 size_t thousands_sep_size; 546 547 int groups = 0; 548 549 grouping = lc->mon_grouping; 550 decimal_point = lc->mon_decimal_point; 551 if (*decimal_point == '\0') 552 decimal_point = lc->decimal_point; 553 thousands_sep = lc->mon_thousands_sep; 554 if (*thousands_sep == '\0') 555 thousands_sep = lc->thousands_sep; 556 557 decimal_point_size = strlen(decimal_point); 558 thousands_sep_size = strlen(thousands_sep); 559 560 /* fill left_prec with default value */ 561 if (left_prec == -1) 562 left_prec = 0; 563 564 /* fill right_prec with default value */ 565 if (right_prec == -1) { 566 if (*flags & USE_INTL_CURRENCY) 567 right_prec = lc->int_frac_digits; 568 else 569 right_prec = lc->frac_digits; 570 571 if (right_prec == CHAR_MAX) /* POSIX locale ? */ 572 right_prec = 2; 573 } 574 575 if (*flags & NEED_GROUPING) 576 left_prec += get_groups(left_prec, grouping); 577 578 /* convert to string */ 579 avalue_size = asprintf_l(&avalue, loc, "%*.*f", 580 left_prec + right_prec + 1, right_prec, value); 581 if (avalue_size < 0) 582 return (NULL); 583 584 /* make sure that we've enough space for result string */ 585 bufsize = avalue_size * (1 + thousands_sep_size) + decimal_point_size + 586 1; 587 rslt = calloc(1, bufsize); 588 if (rslt == NULL) { 589 free(avalue); 590 return (NULL); 591 } 592 bufend = rslt + bufsize - 1; /* reserve space for trailing '\0' */ 593 594 /* skip spaces at beginning */ 595 padded = 0; 596 while (avalue[padded] == ' ') { 597 padded++; 598 avalue_size--; 599 } 600 601 if (right_prec > 0) { 602 bufend -= right_prec; 603 memcpy(bufend, avalue + avalue_size + padded - right_prec, 604 (size_t) right_prec); 605 bufend -= decimal_point_size; 606 memcpy(bufend, decimal_point, decimal_point_size); 607 avalue_size -= (right_prec + 1); 608 } 609 610 if ((*flags & NEED_GROUPING) && 611 thousands_sep_size > 0 && /* XXX: need investigation */ 612 *grouping != CHAR_MAX && 613 *grouping > 0) { 614 while (avalue_size > (int)*grouping) { 615 GRPCPY(*grouping); 616 GRPSEP; 617 grouping++; 618 619 /* no more grouping ? */ 620 if (*grouping == CHAR_MAX) 621 break; 622 623 /* rest grouping with same value ? */ 624 if (*grouping == 0) { 625 grouping--; 626 while (avalue_size > *grouping) { 627 GRPCPY(*grouping); 628 GRPSEP; 629 } 630 } 631 } 632 if (avalue_size != 0) 633 GRPCPY(avalue_size); 634 padded -= groups; 635 } else { 636 bufend -= avalue_size; 637 memcpy(bufend, avalue + padded, (size_t) avalue_size); 638 if (right_prec == 0) 639 padded -= (int)decimal_point_size; 640 } 641 642 /* do padding with pad_char */ 643 if (padded > 0) { 644 bufend -= padded; 645 memset(bufend, pad_char, (size_t) padded); 646 } 647 648 bufsize = rslt + bufsize - bufend; 649 memmove(rslt, bufend, bufsize); 650 free(avalue); 651 return (rslt); 652 } 653 654 ssize_t 655 strfmon(char * __restrict s, size_t maxsize, const char * __restrict format, 656 ...) 657 { 658 ssize_t ret; 659 va_list ap; 660 661 va_start(ap, format); 662 ret = vstrfmon_l(s, maxsize, _current_locale(), format, ap); 663 va_end(ap); 664 665 return ret; 666 } 667 668 ssize_t 669 strfmon_l(char * __restrict s, size_t maxsize, locale_t loc, 670 const char * __restrict format, ...) 671 { 672 ssize_t ret; 673 va_list ap; 674 675 va_start(ap, format); 676 ret = vstrfmon_l(s, maxsize, loc, format, ap); 677 va_end(ap); 678 679 return ret; 680 } 681
Indexes created Tue Sep 23 02:09:52 GMT 2025