1 /* $NetBSD: strfmon.c,v 1.7 2009/01/30 23:46:03 lukem 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 1.7 2009/01/30 23:46:03 lukem 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 <ctype.h> 46 #include <errno.h> 47 #include <limits.h> 48 #include <locale.h> 49 #include <stdarg.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <stddef.h> 54 55 /* internal flags */ 56 #define NEED_GROUPING 0x01 /* print digits grouped (default) */ 57 #define SIGN_POSN_USED 0x02 /* '+' or '(' usage flag */ 58 #define LOCALE_POSN 0x04 /* use locale defined +/- (default) */ 59 #define PARENTH_POSN 0x08 /* enclose negative amount in () */ 60 #define SUPRESS_CURR_SYMBOL 0x10 /* supress the currency from output */ 61 #define LEFT_JUSTIFY 0x20 /* left justify */ 62 #define USE_INTL_CURRENCY 0x40 /* use international currency symbol */ 63 #define IS_NEGATIVE 0x80 /* is argument value negative ? */ 64 65 /* internal macros */ 66 #define PRINT(CH) do { \ 67 if (dst >= s + maxsize) \ 68 goto e2big_error; \ 69 *dst++ = CH; \ 70 } while (/* CONSTCOND */ 0) 71 72 #define PRINTS(STR) do { \ 73 const char *tmps = STR; \ 74 while (*tmps != '\0') \ 75 PRINT(*tmps++); \ 76 } while (/* CONSTCOND */ 0) 77 78 #define GET_NUMBER(VAR) do { \ 79 VAR = 0; \ 80 while (isdigit((unsigned char)*fmt)) { \ 81 VAR *= 10; \ 82 VAR += *fmt - '0'; \ 83 if (VAR > 0x00ffffff) \ 84 goto e2big_error; \ 85 fmt++; \ 86 } \ 87 } while (/* CONSTCOND */ 0) 88 89 #define GRPCPY(howmany) do { \ 90 int i = howmany; \ 91 while (i-- > 0) { \ 92 avalue_size--; \ 93 *--bufend = *(avalue+avalue_size+padded); \ 94 } \ 95 } while (/* CONSTCOND */ 0) 96 97 #define GRPSEP do { \ 98 *--bufend = thousands_sep; \ 99 groups++; \ 100 } while (/* CONSTCOND */ 0) 101 102 static void __setup_vars(int, char *, char *, char *, const char **); 103 static int __calc_left_pad(int, char *); 104 static char *__format_grouped_double(double, int *, int, int, int); 105 106 ssize_t 107 strfmon(char * __restrict s, size_t maxsize, const char * __restrict format, 108 ...) 109 { 110 va_list ap; 111 char *dst; /* output destination pointer */ 112 const char *fmt; /* current format poistion pointer */ 113 struct lconv *lc; /* pointer to lconv structure */ 114 char *asciivalue; /* formatted double pointer */ 115 116 int flags; /* formatting options */ 117 int pad_char; /* padding character */ 118 int pad_size; /* pad size */ 119 int width; /* field width */ 120 int left_prec; /* left precision */ 121 int right_prec; /* right precision */ 122 double value; /* just value */ 123 char space_char = ' '; /* space after currency */ 124 125 char cs_precedes, /* values gathered from struct lconv */ 126 sep_by_space, 127 sign_posn, 128 *currency_symbol; 129 const char *signstr; 130 131 char *tmpptr; /* temporary vars */ 132 int sverrno; 133 134 va_start(ap, format); 135 136 lc = localeconv(); 137 dst = s; 138 fmt = format; 139 asciivalue = NULL; 140 currency_symbol = NULL; 141 pad_size = 0; 142 143 while (*fmt) { 144 /* pass nonformating characters AS IS */ 145 if (*fmt != '%') 146 goto literal; 147 148 /* '%' found ! */ 149 150 /* "%%" mean just '%' */ 151 if (*(fmt+1) == '%') { 152 fmt++; 153 literal: 154 PRINT(*fmt++); 155 continue; 156 } 157 158 /* set up initial values */ 159 flags = (NEED_GROUPING|LOCALE_POSN); 160 pad_char = ' '; /* padding character is "space" */ 161 left_prec = -1; /* no left precision specified */ 162 right_prec = -1; /* no right precision specified */ 163 width = -1; /* no width specified */ 164 value = 0; /* we have no value to print now */ 165 166 /* Flags */ 167 while (/* CONSTCOND */ 1) { 168 switch (*++fmt) { 169 case '=': /* fill character */ 170 pad_char = *++fmt; 171 if (pad_char == '\0') 172 goto format_error; 173 continue; 174 case '^': /* not group currency */ 175 flags &= ~(NEED_GROUPING); 176 continue; 177 case '+': /* use locale defined signs */ 178 if (flags & SIGN_POSN_USED) 179 goto format_error; 180 flags |= (SIGN_POSN_USED|LOCALE_POSN); 181 continue; 182 case '(': /* enclose negatives with () */ 183 if (flags & SIGN_POSN_USED) 184 goto format_error; 185 flags |= (SIGN_POSN_USED|PARENTH_POSN); 186 continue; 187 case '!': /* suppress currency symbol */ 188 flags |= SUPRESS_CURR_SYMBOL; 189 continue; 190 case '-': /* alignment (left) */ 191 flags |= LEFT_JUSTIFY; 192 continue; 193 default: 194 break; 195 } 196 break; 197 } 198 199 /* field Width */ 200 if (isdigit((unsigned char)*fmt)) { 201 ptrdiff_t d = dst - s; 202 GET_NUMBER(width); 203 /* Do we have enough space to put number with 204 * required width ? 205 */ 206 207 if ((size_t)(d + width) >= maxsize) 208 goto e2big_error; 209 } 210 211 /* Left precision */ 212 if (*fmt == '#') { 213 if (!isdigit((unsigned char)*++fmt)) 214 goto format_error; 215 GET_NUMBER(left_prec); 216 } 217 218 /* Right precision */ 219 if (*fmt == '.') { 220 if (!isdigit((unsigned char)*++fmt)) 221 goto format_error; 222 GET_NUMBER(right_prec); 223 } 224 225 /* Conversion Characters */ 226 switch (*fmt++) { 227 case 'i': /* use internaltion currency format */ 228 flags |= USE_INTL_CURRENCY; 229 break; 230 case 'n': /* use national currency format */ 231 flags &= ~(USE_INTL_CURRENCY); 232 break; 233 default: /* required character is missing or 234 premature EOS */ 235 goto format_error; 236 } 237 238 if (currency_symbol) 239 free(currency_symbol); 240 if (flags & USE_INTL_CURRENCY) { 241 currency_symbol = strdup(lc->int_curr_symbol); 242 if (currency_symbol != NULL) 243 space_char = *(currency_symbol+3); 244 } else 245 currency_symbol = strdup(lc->currency_symbol); 246 247 if (currency_symbol == NULL) 248 goto end_error; /* ENOMEM. */ 249 250 /* value itself */ 251 value = va_arg(ap, double); 252 253 /* detect sign */ 254 if (value < 0) { 255 flags |= IS_NEGATIVE; 256 value = -value; 257 } 258 259 /* fill left_prec with amount of padding chars */ 260 if (left_prec >= 0) { 261 pad_size = __calc_left_pad((flags ^ IS_NEGATIVE), 262 currency_symbol) - 263 __calc_left_pad(flags, currency_symbol); 264 if (pad_size < 0) 265 pad_size = 0; 266 } 267 268 asciivalue = __format_grouped_double(value, &flags, 269 left_prec, right_prec, pad_char); 270 if (asciivalue == NULL) 271 goto end_error; /* errno already set */ 272 /* to ENOMEM by malloc() */ 273 274 /* set some variables for later use */ 275 __setup_vars(flags, &cs_precedes, &sep_by_space, 276 &sign_posn, &signstr); 277 278 /* 279 * Description of some LC_MONETARY's values: 280 * 281 * p_cs_precedes & n_cs_precedes 282 * 283 * = 1 - $currency_symbol precedes the value 284 * for a monetary quantity with a non-negative value 285 * = 0 - symbol succeeds the value 286 * 287 * p_sep_by_space & n_sep_by_space 288 * 289 * = 0 - no space separates $currency_symbol 290 * from the value for a monetary quantity with a 291 * non-negative value 292 * = 1 - space separates the symbol from the value 293 * = 2 - space separates the symbol and the sign string, 294 * if adjacent. 295 * 296 * p_sign_posn & n_sign_posn 297 * 298 * = 0 - parentheses enclose the quantity and the 299 * $currency_symbol 300 * = 1 - the sign string precedes the quantity and the 301 * $currency_symbol 302 * = 2 - the sign string succeeds the quantity and the 303 * $currency_symbol 304 * = 3 - the sign string precedes the $currency_symbol 305 * = 4 - the sign string succeeds the $currency_symbol 306 * 307 */ 308 309 tmpptr = dst; 310 311 while (pad_size-- > 0) 312 PRINT(' '); 313 314 if (sign_posn == 0 && (flags & IS_NEGATIVE)) 315 PRINT('('); 316 317 if (cs_precedes == 1) { 318 if (sign_posn == 1 || sign_posn == 3) { 319 PRINTS(signstr); 320 if (sep_by_space == 2) /* XXX: ? */ 321 PRINT(' '); 322 } 323 324 if (!(flags & SUPRESS_CURR_SYMBOL)) { 325 PRINTS(currency_symbol); 326 327 if (sign_posn == 4) { 328 if (sep_by_space == 2) 329 PRINT(space_char); 330 PRINTS(signstr); 331 if (sep_by_space == 1) 332 PRINT(' '); 333 } else if (sep_by_space == 1) 334 PRINT(space_char); 335 } 336 } else if (sign_posn == 1) 337 PRINTS(signstr); 338 339 PRINTS(asciivalue); 340 341 if (cs_precedes == 0) { 342 if (sign_posn == 3) { 343 if (sep_by_space == 1) 344 PRINT(' '); 345 PRINTS(signstr); 346 } 347 348 if (!(flags & SUPRESS_CURR_SYMBOL)) { 349 if ((sign_posn == 3 && sep_by_space == 2) 350 || (sep_by_space == 1 351 && (sign_posn == 0 352 || sign_posn == 1 353 || sign_posn == 2 354 || sign_posn == 4))) 355 PRINT(space_char); 356 PRINTS(currency_symbol); /* XXX: len */ 357 if (sign_posn == 4) { 358 if (sep_by_space == 2) 359 PRINT(' '); 360 PRINTS(signstr); 361 } 362 } 363 } 364 365 if (sign_posn == 2) { 366 if (sep_by_space == 2) 367 PRINT(' '); 368 PRINTS(signstr); 369 } 370 371 if (sign_posn == 0 && (flags & IS_NEGATIVE)) 372 PRINT(')'); 373 374 if (dst - tmpptr < width) { 375 if (flags & LEFT_JUSTIFY) { 376 while (dst - tmpptr < width) 377 PRINT(' '); 378 } else { 379 pad_size = dst-tmpptr; 380 memmove(tmpptr + width-pad_size, tmpptr, 381 (size_t) pad_size); 382 memset(tmpptr, ' ', (size_t) width-pad_size); 383 dst += width-pad_size; 384 } 385 } 386 } 387 388 PRINT('\0'); 389 va_end(ap); 390 free(asciivalue); 391 free(currency_symbol); 392 return (dst - s - 1); /* return size of put data except trailing '\0' */ 393 394 e2big_error: 395 errno = E2BIG; 396 goto end_error; 397 398 format_error: 399 errno = EINVAL; 400 401 end_error: 402 sverrno = errno; 403 if (asciivalue != NULL) 404 free(asciivalue); 405 if (currency_symbol != NULL) 406 free(currency_symbol); 407 errno = sverrno; 408 va_end(ap); 409 return (-1); 410 } 411 412 static void 413 __setup_vars(int flags, char *cs_precedes, char *sep_by_space, 414 char *sign_posn, const char **signstr) { 415 struct lconv *lc = localeconv(); 416 417 if ((flags & IS_NEGATIVE) && (flags & USE_INTL_CURRENCY)) { 418 *cs_precedes = lc->int_n_cs_precedes; 419 *sep_by_space = lc->int_n_sep_by_space; 420 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->int_n_sign_posn; 421 *signstr = (lc->negative_sign == '\0') ? "-" 422 : lc->negative_sign; 423 } else if (flags & USE_INTL_CURRENCY) { 424 *cs_precedes = lc->int_p_cs_precedes; 425 *sep_by_space = lc->int_p_sep_by_space; 426 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->int_p_sign_posn; 427 *signstr = lc->positive_sign; 428 } else if (flags & IS_NEGATIVE) { 429 *cs_precedes = lc->n_cs_precedes; 430 *sep_by_space = lc->n_sep_by_space; 431 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->n_sign_posn; 432 *signstr = (lc->negative_sign == '\0') ? "-" 433 : lc->negative_sign; 434 } else { 435 *cs_precedes = lc->p_cs_precedes; 436 *sep_by_space = lc->p_sep_by_space; 437 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->p_sign_posn; 438 *signstr = lc->positive_sign; 439 } 440 441 /* Set defult values for unspecified information. */ 442 if (*cs_precedes != 0) 443 *cs_precedes = 1; 444 if (*sep_by_space == CHAR_MAX) 445 *sep_by_space = 0; 446 if (*sign_posn == CHAR_MAX) 447 *sign_posn = 0; 448 } 449 450 static int 451 __calc_left_pad(int flags, char *cur_symb) { 452 453 char cs_precedes, sep_by_space, sign_posn; 454 const char *signstr; 455 int left_chars = 0; 456 457 __setup_vars(flags, &cs_precedes, &sep_by_space, &sign_posn, &signstr); 458 459 if (cs_precedes != 0) { 460 left_chars += strlen(cur_symb); 461 if (sep_by_space != 0) 462 left_chars++; 463 } 464 465 switch (sign_posn) { 466 case 1: 467 left_chars += strlen(signstr); 468 break; 469 case 3: 470 case 4: 471 if (cs_precedes != 0) 472 left_chars += strlen(signstr); 473 } 474 return (left_chars); 475 } 476 477 static int 478 get_groups(int size, char *grouping) { 479 480 int chars = 0; 481 482 if (*grouping == CHAR_MAX || *grouping <= 0) /* no grouping ? */ 483 return (0); 484 485 while (size > (int)*grouping) { 486 chars++; 487 size -= (int)*grouping++; 488 /* no more grouping ? */ 489 if (*grouping == CHAR_MAX) 490 break; 491 /* rest grouping with same value ? */ 492 if (*grouping == 0) { 493 chars += (size - 1) / *(grouping - 1); 494 break; 495 } 496 } 497 return (chars); 498 } 499 500 /* convert double to ASCII */ 501 static char * 502 __format_grouped_double(double value, int *flags, 503 int left_prec, int right_prec, int pad_char) { 504 505 char *rslt; 506 char *avalue; 507 int avalue_size; 508 char fmt[32]; 509 510 size_t bufsize; 511 char *bufend; 512 513 int padded; 514 515 struct lconv *lc = localeconv(); 516 char *grouping; 517 char decimal_point; 518 char thousands_sep; 519 520 int groups = 0; 521 522 grouping = lc->mon_grouping; 523 decimal_point = *lc->mon_decimal_point; 524 if (decimal_point == '\0') 525 decimal_point = *lc->decimal_point; 526 thousands_sep = *lc->mon_thousands_sep; 527 if (thousands_sep == '\0') 528 thousands_sep = *lc->thousands_sep; 529 530 /* fill left_prec with default value */ 531 if (left_prec == -1) 532 left_prec = 0; 533 534 /* fill right_prec with default value */ 535 if (right_prec == -1) { 536 if (*flags & USE_INTL_CURRENCY) 537 right_prec = lc->int_frac_digits; 538 else 539 right_prec = lc->frac_digits; 540 541 if (right_prec == CHAR_MAX) /* POSIX locale ? */ 542 right_prec = 2; 543 } 544 545 if (*flags & NEED_GROUPING) 546 left_prec += get_groups(left_prec, grouping); 547 548 /* convert to string */ 549 snprintf(fmt, sizeof(fmt), "%%%d.%df", left_prec + right_prec + 1, 550 right_prec); 551 avalue_size = asprintf(&avalue, fmt, value); 552 if (avalue_size < 0) 553 return (NULL); 554 555 /* make sure that we've enough space for result string */ 556 bufsize = strlen(avalue)*2+1; 557 rslt = malloc(bufsize); 558 if (rslt == NULL) { 559 free(avalue); 560 return (NULL); 561 } 562 memset(rslt, 0, bufsize); 563 bufend = rslt + bufsize - 1; /* reserve space for trailing '\0' */ 564 565 /* skip spaces at beggining */ 566 padded = 0; 567 while (avalue[padded] == ' ') { 568 padded++; 569 avalue_size--; 570 } 571 572 if (right_prec > 0) { 573 bufend -= right_prec; 574 memcpy(bufend, avalue + avalue_size+padded-right_prec, 575 (size_t) right_prec); 576 *--bufend = decimal_point; 577 avalue_size -= (right_prec + 1); 578 } 579 580 if ((*flags & NEED_GROUPING) && 581 thousands_sep != '\0' && /* XXX: need investigation */ 582 *grouping != CHAR_MAX && 583 *grouping > 0) { 584 while (avalue_size > (int)*grouping) { 585 GRPCPY(*grouping); 586 GRPSEP; 587 grouping++; 588 589 /* no more grouping ? */ 590 if (*grouping == CHAR_MAX) 591 break; 592 593 /* rest grouping with same value ? */ 594 if (*grouping == 0) { 595 grouping--; 596 while (avalue_size > *grouping) { 597 GRPCPY(*grouping); 598 GRPSEP; 599 } 600 } 601 } 602 if (avalue_size != 0) 603 GRPCPY(avalue_size); 604 padded -= groups; 605 606 } else { 607 bufend -= avalue_size; 608 memcpy(bufend, avalue+padded, (size_t) avalue_size); 609 if (right_prec == 0) 610 padded--; /* decrease assumed $decimal_point */ 611 } 612 613 /* do padding with pad_char */ 614 if (padded > 0) { 615 bufend -= padded; 616 memset(bufend, pad_char, (size_t) padded); 617 } 618 619 bufsize = bufsize - (bufend - rslt) + 1; 620 memmove(rslt, bufend, bufsize); 621 free(avalue); 622 return (rslt); 623 } 624