1 /* $NetBSD: strfmon.c,v 1.9 2012/03/13 21:13:48 christos 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 1.9 2012/03/13 21:13:48 christos Exp $"); 36 #endif 37 #endif /* LIBC_SCCS and not lint */ 38 39 #if defined(__NetBSD__) 40 #include "namespace.h" 41 #include <monetary.h> 42 #endif 43 44 #include <sys/types.h> 45 #include <assert.h> 46 #include <ctype.h> 47 #include <errno.h> 48 #include <limits.h> 49 #include <locale.h> 50 #include <stdarg.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <stddef.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 /* internal macros */ 67 #define PRINT(CH) do { \ 68 if (dst >= s + maxsize) \ 69 goto e2big_error; \ 70 *dst++ = CH; \ 71 } while (/* CONSTCOND */ 0) 72 73 #define PRINTS(STR) do { \ 74 const char *tmps = STR; \ 75 while (*tmps != '\0') \ 76 PRINT(*tmps++); \ 77 } while (/* CONSTCOND */ 0) 78 79 #define GET_NUMBER(VAR) do { \ 80 VAR = 0; \ 81 while (isdigit((unsigned char)*fmt)) { \ 82 VAR *= 10; \ 83 VAR += *fmt - '0'; \ 84 if (VAR > 0x00ffffff) \ 85 goto e2big_error; \ 86 fmt++; \ 87 } \ 88 } while (/* CONSTCOND */ 0) 89 90 #define GRPCPY(howmany) do { \ 91 int i = howmany; \ 92 while (i-- > 0) { \ 93 avalue_size--; \ 94 *--bufend = *(avalue+avalue_size+padded); \ 95 } \ 96 } while (/* CONSTCOND */ 0) 97 98 #define GRPSEP do { \ 99 *--bufend = thousands_sep; \ 100 groups++; \ 101 } while (/* CONSTCOND */ 0) 102 103 static void __setup_vars(int, char *, char *, char *, const char **); 104 static int __calc_left_pad(int, char *); 105 static char *__format_grouped_double(double, int *, int, int, int); 106 107 ssize_t 108 strfmon(char * __restrict s, size_t maxsize, const char * __restrict format, 109 ...) 110 { 111 va_list ap; 112 char *dst; /* output destination pointer */ 113 const char *fmt; /* current format poistion pointer */ 114 struct lconv *lc; /* pointer to lconv structure */ 115 char *asciivalue; /* formatted double pointer */ 116 117 int flags; /* formatting options */ 118 int pad_char; /* padding character */ 119 int pad_size; /* pad size */ 120 int width; /* field width */ 121 int left_prec; /* left precision */ 122 int right_prec; /* right precision */ 123 double value; /* just value */ 124 char space_char = ' '; /* space after currency */ 125 126 char cs_precedes, /* values gathered from struct lconv */ 127 sep_by_space, 128 sign_posn, 129 *currency_symbol; 130 const char *signstr; 131 132 char *tmpptr; /* temporary vars */ 133 int sverrno; 134 135 va_start(ap, format); 136 137 lc = localeconv(); 138 dst = s; 139 fmt = format; 140 asciivalue = NULL; 141 currency_symbol = NULL; 142 pad_size = 0; 143 144 while (*fmt) { 145 /* pass nonformating characters AS IS */ 146 if (*fmt != '%') 147 goto literal; 148 149 /* '%' found ! */ 150 151 /* "%%" mean just '%' */ 152 if (*(fmt+1) == '%') { 153 fmt++; 154 literal: 155 PRINT(*fmt++); 156 continue; 157 } 158 159 /* set up initial values */ 160 flags = (NEED_GROUPING|LOCALE_POSN); 161 pad_char = ' '; /* padding character is "space" */ 162 left_prec = -1; /* no left precision specified */ 163 right_prec = -1; /* no right precision specified */ 164 width = -1; /* no width specified */ 165 value = 0; /* we have no value to print now */ 166 167 /* Flags */ 168 while (/* CONSTCOND */ 1) { 169 switch (*++fmt) { 170 case '=': /* fill character */ 171 pad_char = *++fmt; 172 if (pad_char == '\0') 173 goto format_error; 174 continue; 175 case '^': /* not group currency */ 176 flags &= ~(NEED_GROUPING); 177 continue; 178 case '+': /* use locale defined signs */ 179 if (flags & SIGN_POSN_USED) 180 goto format_error; 181 flags |= (SIGN_POSN_USED|LOCALE_POSN); 182 continue; 183 case '(': /* enclose negatives with () */ 184 if (flags & SIGN_POSN_USED) 185 goto format_error; 186 flags |= (SIGN_POSN_USED|PARENTH_POSN); 187 continue; 188 case '!': /* suppress currency symbol */ 189 flags |= SUPRESS_CURR_SYMBOL; 190 continue; 191 case '-': /* alignment (left) */ 192 flags |= LEFT_JUSTIFY; 193 continue; 194 default: 195 break; 196 } 197 break; 198 } 199 200 /* field Width */ 201 if (isdigit((unsigned char)*fmt)) { 202 ptrdiff_t d = dst - s; 203 GET_NUMBER(width); 204 /* Do we have enough space to put number with 205 * required width ? 206 */ 207 208 if ((size_t)(d + width) >= maxsize) 209 goto e2big_error; 210 } 211 212 /* Left precision */ 213 if (*fmt == '#') { 214 if (!isdigit((unsigned char)*++fmt)) 215 goto format_error; 216 GET_NUMBER(left_prec); 217 } 218 219 /* Right precision */ 220 if (*fmt == '.') { 221 if (!isdigit((unsigned char)*++fmt)) 222 goto format_error; 223 GET_NUMBER(right_prec); 224 } 225 226 /* Conversion Characters */ 227 switch (*fmt++) { 228 case 'i': /* use internaltion currency format */ 229 flags |= USE_INTL_CURRENCY; 230 break; 231 case 'n': /* use national currency format */ 232 flags &= ~(USE_INTL_CURRENCY); 233 break; 234 default: /* required character is missing or 235 premature EOS */ 236 goto format_error; 237 } 238 239 if (currency_symbol) 240 free(currency_symbol); 241 if (flags & USE_INTL_CURRENCY) { 242 currency_symbol = strdup(lc->int_curr_symbol); 243 if (currency_symbol != NULL) 244 space_char = *(currency_symbol+3); 245 } else 246 currency_symbol = strdup(lc->currency_symbol); 247 248 if (currency_symbol == NULL) 249 goto end_error; /* ENOMEM. */ 250 251 /* value itself */ 252 value = va_arg(ap, double); 253 254 /* detect sign */ 255 if (value < 0) { 256 flags |= IS_NEGATIVE; 257 value = -value; 258 } 259 260 /* fill left_prec with amount of padding chars */ 261 if (left_prec >= 0) { 262 pad_size = __calc_left_pad((flags ^ IS_NEGATIVE), 263 currency_symbol) - 264 __calc_left_pad(flags, currency_symbol); 265 if (pad_size < 0) 266 pad_size = 0; 267 } 268 269 asciivalue = __format_grouped_double(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(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) /* XXX: ? */ 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 == 1 352 && (sign_posn == 0 353 || sign_posn == 1 354 || sign_posn == 2 355 || sign_posn == 4))) 356 PRINT(space_char); 357 PRINTS(currency_symbol); /* XXX: len */ 358 if (sign_posn == 4) { 359 if (sep_by_space == 2) 360 PRINT(' '); 361 PRINTS(signstr); 362 } 363 } 364 } 365 366 if (sign_posn == 2) { 367 if (sep_by_space == 2) 368 PRINT(' '); 369 PRINTS(signstr); 370 } 371 372 if (sign_posn == 0 && (flags & IS_NEGATIVE)) 373 PRINT(')'); 374 375 if (dst - tmpptr < width) { 376 if (flags & LEFT_JUSTIFY) { 377 while (dst - tmpptr < width) 378 PRINT(' '); 379 } else { 380 _DIAGASSERT(__type_fit(int, dst - tmpptr)); 381 pad_size = dst - tmpptr; 382 memmove(tmpptr + width-pad_size, tmpptr, 383 (size_t) pad_size); 384 memset(tmpptr, ' ', (size_t) width-pad_size); 385 dst += width-pad_size; 386 } 387 } 388 } 389 390 PRINT('\0'); 391 va_end(ap); 392 free(asciivalue); 393 free(currency_symbol); 394 return (dst - s - 1); /* return size of put data except trailing '\0' */ 395 396 e2big_error: 397 errno = E2BIG; 398 goto end_error; 399 400 format_error: 401 errno = EINVAL; 402 403 end_error: 404 sverrno = errno; 405 if (asciivalue != NULL) 406 free(asciivalue); 407 if (currency_symbol != NULL) 408 free(currency_symbol); 409 errno = sverrno; 410 va_end(ap); 411 return (-1); 412 } 413 414 static void 415 __setup_vars(int flags, char *cs_precedes, char *sep_by_space, 416 char *sign_posn, const char **signstr) { 417 struct lconv *lc = localeconv(); 418 419 if ((flags & IS_NEGATIVE) && (flags & USE_INTL_CURRENCY)) { 420 *cs_precedes = lc->int_n_cs_precedes; 421 *sep_by_space = lc->int_n_sep_by_space; 422 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->int_n_sign_posn; 423 *signstr = (lc->negative_sign == '\0') ? "-" 424 : lc->negative_sign; 425 } else if (flags & USE_INTL_CURRENCY) { 426 *cs_precedes = lc->int_p_cs_precedes; 427 *sep_by_space = lc->int_p_sep_by_space; 428 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->int_p_sign_posn; 429 *signstr = lc->positive_sign; 430 } else if (flags & IS_NEGATIVE) { 431 *cs_precedes = lc->n_cs_precedes; 432 *sep_by_space = lc->n_sep_by_space; 433 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->n_sign_posn; 434 *signstr = (lc->negative_sign == '\0') ? "-" 435 : lc->negative_sign; 436 } else { 437 *cs_precedes = lc->p_cs_precedes; 438 *sep_by_space = lc->p_sep_by_space; 439 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->p_sign_posn; 440 *signstr = lc->positive_sign; 441 } 442 443 /* Set defult values for unspecified information. */ 444 if (*cs_precedes != 0) 445 *cs_precedes = 1; 446 if (*sep_by_space == CHAR_MAX) 447 *sep_by_space = 0; 448 if (*sign_posn == CHAR_MAX) 449 *sign_posn = 0; 450 } 451 452 static int 453 __calc_left_pad(int flags, char *cur_symb) { 454 455 char cs_precedes, sep_by_space, sign_posn; 456 const char *signstr; 457 size_t left_chars = 0; 458 459 __setup_vars(flags, &cs_precedes, &sep_by_space, &sign_posn, &signstr); 460 461 if (cs_precedes != 0) { 462 left_chars += strlen(cur_symb); 463 if (sep_by_space != 0) 464 left_chars++; 465 } 466 467 switch (sign_posn) { 468 case 1: 469 left_chars += strlen(signstr); 470 break; 471 case 3: 472 case 4: 473 if (cs_precedes != 0) 474 left_chars += strlen(signstr); 475 } 476 _DIAGASSERT(__type_fit(int, left_chars)); 477 return (int)left_chars; 478 } 479 480 static int 481 get_groups(int size, char *grouping) { 482 483 int chars = 0; 484 485 if (*grouping == CHAR_MAX || *grouping <= 0) /* no grouping ? */ 486 return (0); 487 488 while (size > (int)*grouping) { 489 chars++; 490 size -= (int)*grouping++; 491 /* no more grouping ? */ 492 if (*grouping == CHAR_MAX) 493 break; 494 /* rest grouping with same value ? */ 495 if (*grouping == 0) { 496 chars += (size - 1) / *(grouping - 1); 497 break; 498 } 499 } 500 return (chars); 501 } 502 503 /* convert double to ASCII */ 504 static char * 505 __format_grouped_double(double value, int *flags, 506 int left_prec, int right_prec, int pad_char) { 507 508 char *rslt; 509 char *avalue; 510 int avalue_size; 511 512 size_t bufsize; 513 char *bufend; 514 515 int padded; 516 517 struct lconv *lc = localeconv(); 518 char *grouping; 519 char decimal_point; 520 char thousands_sep; 521 522 int groups = 0; 523 524 grouping = lc->mon_grouping; 525 decimal_point = *lc->mon_decimal_point; 526 if (decimal_point == '\0') 527 decimal_point = *lc->decimal_point; 528 thousands_sep = *lc->mon_thousands_sep; 529 if (thousands_sep == '\0') 530 thousands_sep = *lc->thousands_sep; 531 532 /* fill left_prec with default value */ 533 if (left_prec == -1) 534 left_prec = 0; 535 536 /* fill right_prec with default value */ 537 if (right_prec == -1) { 538 if (*flags & USE_INTL_CURRENCY) 539 right_prec = lc->int_frac_digits; 540 else 541 right_prec = lc->frac_digits; 542 543 if (right_prec == CHAR_MAX) /* POSIX locale ? */ 544 right_prec = 2; 545 } 546 547 if (*flags & NEED_GROUPING) 548 left_prec += get_groups(left_prec, grouping); 549 550 /* convert to string */ 551 avalue_size = asprintf(&avalue, "%*.*f", left_prec + right_prec + 1, 552 right_prec, value); 553 if (avalue_size < 0) 554 return (NULL); 555 556 /* make sure that we've enough space for result string */ 557 bufsize = avalue_size * 2 + 1; 558 rslt = malloc(bufsize); 559 if (rslt == NULL) { 560 free(avalue); 561 return (NULL); 562 } 563 memset(rslt, 0, bufsize); 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 *grouping != CHAR_MAX && 585 *grouping > 0) { 586 while (avalue_size > (int)*grouping) { 587 GRPCPY(*grouping); 588 GRPSEP; 589 grouping++; 590 591 /* no more grouping ? */ 592 if (*grouping == CHAR_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 bufsize = bufsize - (bufend - rslt) + 1; 622 memmove(rslt, bufend, bufsize); 623 free(avalue); 624 return (rslt); 625 } 626