1 /*- 2 * Copyright (c) 2001 Alexey Zelkin <phantom@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/types.h> 32 #include <ctype.h> 33 #include <errno.h> 34 #include <limits.h> 35 #include <locale.h> 36 #include <monetary.h> 37 #include <stdarg.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <string.h> 41 42 /* internal flags */ 43 #define NEED_GROUPING 0x01 /* print digits grouped (default) */ 44 #define SIGN_POSN_USED 0x02 /* '+' or '(' usage flag */ 45 #define LOCALE_POSN 0x04 /* use locale defined +/- (default) */ 46 #define PARENTH_POSN 0x08 /* enclose negative amount in () */ 47 #define SUPRESS_CURR_SYMBOL 0x10 /* supress the currency from output */ 48 #define LEFT_JUSTIFY 0x20 /* left justify */ 49 #define USE_INTL_CURRENCY 0x40 /* use international currency symbol */ 50 #define IS_NEGATIVE 0x80 /* is argument value negative ? */ 51 52 /* internal macros */ 53 #define PRINT(CH) do { \ 54 if (dst >= s + maxsize) \ 55 goto e2big_error; \ 56 *dst++ = CH; \ 57 } while (0) 58 59 #define PRINTS(STR) do { \ 60 char *tmps = STR; \ 61 while (*tmps != '\0') \ 62 PRINT(*tmps++); \ 63 } while (0) 64 65 #define GET_NUMBER(VAR) do { \ 66 VAR = 0; \ 67 while (isdigit((unsigned char)*fmt)) { \ 68 VAR *= 10; \ 69 VAR += *fmt - '0'; \ 70 if (VAR < 0) \ 71 goto e2big_error; \ 72 fmt++; \ 73 } \ 74 } while (0) 75 76 #define GRPCPY(howmany) do { \ 77 int i = howmany; \ 78 while (i-- > 0) { \ 79 avalue_size--; \ 80 *--bufend = *(avalue+avalue_size+padded); \ 81 } \ 82 } while (0) 83 84 #define GRPSEP do { \ 85 *--bufend = thousands_sep; \ 86 groups++; \ 87 } while (0) 88 89 static void __setup_vars(int, char *, char *, char *, char **); 90 static int __calc_left_pad(int, char *); 91 static char *__format_grouped_double(double, int *, int, int, int); 92 93 ssize_t 94 strfmon(char * __restrict s, size_t maxsize, const char * __restrict format, 95 ...) 96 { 97 va_list ap; 98 char *dst; /* output destination pointer */ 99 const char *fmt; /* current format poistion pointer */ 100 struct lconv *lc; /* pointer to lconv structure */ 101 char *asciivalue; /* formatted double pointer */ 102 103 int flags; /* formatting options */ 104 int pad_char; /* padding character */ 105 int pad_size; /* pad size */ 106 int width; /* field width */ 107 int left_prec; /* left precision */ 108 int right_prec; /* right precision */ 109 double value; /* just value */ 110 char space_char = ' '; /* space after currency */ 111 112 char cs_precedes, /* values gathered from struct lconv */ 113 sep_by_space, 114 sign_posn, 115 *signstr, 116 *currency_symbol; 117 118 char *tmpptr; /* temporary vars */ 119 int sverrno; 120 121 va_start(ap, format); 122 123 lc = localeconv(); 124 dst = s; 125 fmt = format; 126 asciivalue = NULL; 127 currency_symbol = NULL; 128 pad_size = 0; 129 130 while (*fmt) { 131 /* pass nonformating characters AS IS */ 132 if (*fmt != '%') 133 goto literal; 134 135 /* '%' found ! */ 136 137 /* "%%" mean just '%' */ 138 if (*(fmt+1) == '%') { 139 fmt++; 140 literal: 141 PRINT(*fmt++); 142 continue; 143 } 144 145 /* set up initial values */ 146 flags = (NEED_GROUPING|LOCALE_POSN); 147 pad_char = ' '; /* padding character is "space" */ 148 left_prec = -1; /* no left precision specified */ 149 right_prec = -1; /* no right precision specified */ 150 width = -1; /* no width specified */ 151 value = 0; /* we have no value to print now */ 152 153 /* Flags */ 154 while (1) { 155 switch (*++fmt) { 156 case '=': /* fill character */ 157 pad_char = *++fmt; 158 if (pad_char == '\0') 159 goto format_error; 160 continue; 161 case '^': /* not group currency */ 162 flags &= ~(NEED_GROUPING); 163 continue; 164 case '+': /* use locale defined signs */ 165 if (flags & SIGN_POSN_USED) 166 goto format_error; 167 flags |= (SIGN_POSN_USED|LOCALE_POSN); 168 continue; 169 case '(': /* enclose negatives with () */ 170 if (flags & SIGN_POSN_USED) 171 goto format_error; 172 flags |= (SIGN_POSN_USED|PARENTH_POSN); 173 continue; 174 case '!': /* suppress currency symbol */ 175 flags |= SUPRESS_CURR_SYMBOL; 176 continue; 177 case '-': /* alignment (left) */ 178 flags |= LEFT_JUSTIFY; 179 continue; 180 default: 181 break; 182 } 183 break; 184 } 185 186 /* field Width */ 187 if (isdigit((unsigned char)*fmt)) { 188 GET_NUMBER(width); 189 /* Do we have enough space to put number with 190 * required width ? 191 */ 192 if ((unsigned int)width >= maxsize - (dst - s)) 193 goto e2big_error; 194 } 195 196 /* Left precision */ 197 if (*fmt == '#') { 198 if (!isdigit((unsigned char)*++fmt)) 199 goto format_error; 200 GET_NUMBER(left_prec); 201 if ((unsigned int)left_prec >= maxsize - (dst - s)) 202 goto e2big_error; 203 } 204 205 /* Right precision */ 206 if (*fmt == '.') { 207 if (!isdigit((unsigned char)*++fmt)) 208 goto format_error; 209 GET_NUMBER(right_prec); 210 if ((unsigned int)right_prec >= maxsize - (dst - s) - 211 left_prec) 212 goto e2big_error; 213 } 214 215 /* Conversion Characters */ 216 switch (*fmt++) { 217 case 'i': /* use internaltion currency format */ 218 flags |= USE_INTL_CURRENCY; 219 break; 220 case 'n': /* use national currency format */ 221 flags &= ~(USE_INTL_CURRENCY); 222 break; 223 default: /* required character is missing or 224 premature EOS */ 225 goto format_error; 226 } 227 228 if (currency_symbol != NULL) 229 free(currency_symbol); 230 if (flags & USE_INTL_CURRENCY) { 231 currency_symbol = strdup(lc->int_curr_symbol); 232 if (currency_symbol != NULL) 233 space_char = *(currency_symbol+3); 234 } else 235 currency_symbol = strdup(lc->currency_symbol); 236 237 if (currency_symbol == NULL) 238 goto end_error; /* ENOMEM. */ 239 240 /* value itself */ 241 value = va_arg(ap, double); 242 243 /* detect sign */ 244 if (value < 0) { 245 flags |= IS_NEGATIVE; 246 value = -value; 247 } 248 249 /* fill left_prec with amount of padding chars */ 250 if (left_prec >= 0) { 251 pad_size = __calc_left_pad((flags ^ IS_NEGATIVE), 252 currency_symbol) - 253 __calc_left_pad(flags, currency_symbol); 254 if (pad_size < 0) 255 pad_size = 0; 256 } 257 258 if (asciivalue != NULL) 259 free(asciivalue); 260 asciivalue = __format_grouped_double(value, &flags, 261 left_prec, right_prec, pad_char); 262 if (asciivalue == NULL) 263 goto end_error; /* errno already set */ 264 /* to ENOMEM by malloc() */ 265 266 /* set some variables for later use */ 267 __setup_vars(flags, &cs_precedes, &sep_by_space, 268 &sign_posn, &signstr); 269 270 /* 271 * Description of some LC_MONETARY's values: 272 * 273 * p_cs_precedes & n_cs_precedes 274 * 275 * = 1 - $currency_symbol precedes the value 276 * for a monetary quantity with a non-negative value 277 * = 0 - symbol succeeds the value 278 * 279 * p_sep_by_space & n_sep_by_space 280 * 281 * = 0 - no space separates $currency_symbol 282 * from the value for a monetary quantity with a 283 * non-negative value 284 * = 1 - space separates the symbol from the value 285 * = 2 - space separates the symbol and the sign string, 286 * if adjacent. 287 * 288 * p_sign_posn & n_sign_posn 289 * 290 * = 0 - parentheses enclose the quantity and the 291 * $currency_symbol 292 * = 1 - the sign string precedes the quantity and the 293 * $currency_symbol 294 * = 2 - the sign string succeeds the quantity and the 295 * $currency_symbol 296 * = 3 - the sign string precedes the $currency_symbol 297 * = 4 - the sign string succeeds the $currency_symbol 298 * 299 */ 300 301 tmpptr = dst; 302 303 while (pad_size-- > 0) 304 PRINT(' '); 305 306 if (sign_posn == 0 && (flags & IS_NEGATIVE)) 307 PRINT('('); 308 309 if (cs_precedes == 1) { 310 if (sign_posn == 1 || sign_posn == 3) { 311 PRINTS(signstr); 312 if (sep_by_space == 2) /* XXX: ? */ 313 PRINT(' '); 314 } 315 316 if (!(flags & SUPRESS_CURR_SYMBOL)) { 317 PRINTS(currency_symbol); 318 319 if (sign_posn == 4) { 320 if (sep_by_space == 2) 321 PRINT(space_char); 322 PRINTS(signstr); 323 if (sep_by_space == 1) 324 PRINT(' '); 325 } else if (sep_by_space == 1) 326 PRINT(space_char); 327 } 328 } else if (sign_posn == 1) 329 PRINTS(signstr); 330 331 PRINTS(asciivalue); 332 333 if (cs_precedes == 0) { 334 if (sign_posn == 3) { 335 if (sep_by_space == 1) 336 PRINT(' '); 337 PRINTS(signstr); 338 } 339 340 if (!(flags & SUPRESS_CURR_SYMBOL)) { 341 if ((sign_posn == 3 && sep_by_space == 2) 342 || (sep_by_space == 1 343 && (sign_posn == 0 344 || sign_posn == 1 345 || sign_posn == 2 346 || sign_posn == 4))) 347 PRINT(space_char); 348 PRINTS(currency_symbol); /* XXX: len */ 349 if (sign_posn == 4) { 350 if (sep_by_space == 2) 351 PRINT(' '); 352 PRINTS(signstr); 353 } 354 } 355 } 356 357 if (sign_posn == 2) { 358 if (sep_by_space == 2) 359 PRINT(' '); 360 PRINTS(signstr); 361 } 362 363 if (sign_posn == 0 && (flags & IS_NEGATIVE)) 364 PRINT(')'); 365 366 if (dst - tmpptr < width) { 367 if (flags & LEFT_JUSTIFY) { 368 while (dst - tmpptr < width) 369 PRINT(' '); 370 } else { 371 pad_size = dst-tmpptr; 372 memmove(tmpptr + width-pad_size, tmpptr, 373 pad_size); 374 memset(tmpptr, ' ', width-pad_size); 375 dst += width-pad_size; 376 } 377 } 378 } 379 380 PRINT('\0'); 381 va_end(ap); 382 free(asciivalue); 383 free(currency_symbol); 384 return (dst - s - 1); /* return size of put data except trailing '\0' */ 385 386 e2big_error: 387 errno = E2BIG; 388 goto end_error; 389 390 format_error: 391 errno = EINVAL; 392 393 end_error: 394 sverrno = errno; 395 if (asciivalue != NULL) 396 free(asciivalue); 397 if (currency_symbol != NULL) 398 free(currency_symbol); 399 errno = sverrno; 400 va_end(ap); 401 return (-1); 402 } 403 404 static void 405 __setup_vars(int flags, char *cs_precedes, char *sep_by_space, 406 char *sign_posn, char **signstr) { 407 408 struct lconv *lc = localeconv(); 409 410 if ((flags & IS_NEGATIVE) && (flags & USE_INTL_CURRENCY)) { 411 *cs_precedes = lc->int_n_cs_precedes; 412 *sep_by_space = lc->int_n_sep_by_space; 413 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->int_n_sign_posn; 414 *signstr = (lc->negative_sign == '\0') ? "-" 415 : lc->negative_sign; 416 } else if (flags & USE_INTL_CURRENCY) { 417 *cs_precedes = lc->int_p_cs_precedes; 418 *sep_by_space = lc->int_p_sep_by_space; 419 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->int_p_sign_posn; 420 *signstr = lc->positive_sign; 421 } else if (flags & IS_NEGATIVE) { 422 *cs_precedes = lc->n_cs_precedes; 423 *sep_by_space = lc->n_sep_by_space; 424 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->n_sign_posn; 425 *signstr = (lc->negative_sign == '\0') ? "-" 426 : lc->negative_sign; 427 } else { 428 *cs_precedes = lc->p_cs_precedes; 429 *sep_by_space = lc->p_sep_by_space; 430 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->p_sign_posn; 431 *signstr = lc->positive_sign; 432 } 433 434 /* Set defult values for unspecified information. */ 435 if (*cs_precedes != 0) 436 *cs_precedes = 1; 437 if (*sep_by_space == CHAR_MAX) 438 *sep_by_space = 0; 439 if (*sign_posn == CHAR_MAX) 440 *sign_posn = 0; 441 } 442 443 static int 444 __calc_left_pad(int flags, char *cur_symb) { 445 446 char cs_precedes, sep_by_space, sign_posn, *signstr; 447 int left_chars = 0; 448 449 __setup_vars(flags, &cs_precedes, &sep_by_space, &sign_posn, &signstr); 450 451 if (cs_precedes != 0) { 452 left_chars += strlen(cur_symb); 453 if (sep_by_space != 0) 454 left_chars++; 455 } 456 457 switch (sign_posn) { 458 case 1: 459 left_chars += strlen(signstr); 460 break; 461 case 3: 462 case 4: 463 if (cs_precedes != 0) 464 left_chars += strlen(signstr); 465 } 466 return (left_chars); 467 } 468 469 static int 470 get_groups(int size, char *grouping) { 471 472 int chars = 0; 473 474 if (*grouping == CHAR_MAX || *grouping <= 0) /* no grouping ? */ 475 return (0); 476 477 while (size > (int)*grouping) { 478 chars++; 479 size -= (int)*grouping++; 480 /* no more grouping ? */ 481 if (*grouping == CHAR_MAX) 482 break; 483 /* rest grouping with same value ? */ 484 if (*grouping == 0) { 485 chars += (size - 1) / *(grouping - 1); 486 break; 487 } 488 } 489 return (chars); 490 } 491 492 /* convert double to ASCII */ 493 static char * 494 __format_grouped_double(double value, int *flags, 495 int left_prec, int right_prec, int pad_char) { 496 497 char *rslt; 498 char *avalue; 499 int avalue_size; 500 char fmt[32]; 501 502 size_t bufsize; 503 char *bufend; 504 505 int padded; 506 507 struct lconv *lc = localeconv(); 508 char *grouping; 509 char decimal_point; 510 char thousands_sep; 511 512 int groups = 0; 513 514 grouping = lc->mon_grouping; 515 decimal_point = *lc->mon_decimal_point; 516 if (decimal_point == '\0') 517 decimal_point = *lc->decimal_point; 518 thousands_sep = *lc->mon_thousands_sep; 519 if (thousands_sep == '\0') 520 thousands_sep = *lc->thousands_sep; 521 522 /* fill left_prec with default value */ 523 if (left_prec == -1) 524 left_prec = 0; 525 526 /* fill right_prec with default value */ 527 if (right_prec == -1) { 528 if (*flags & USE_INTL_CURRENCY) 529 right_prec = lc->int_frac_digits; 530 else 531 right_prec = lc->frac_digits; 532 533 if (right_prec == CHAR_MAX) /* POSIX locale ? */ 534 right_prec = 2; 535 } 536 537 if (*flags & NEED_GROUPING) 538 left_prec += get_groups(left_prec, grouping); 539 540 /* convert to string */ 541 snprintf(fmt, sizeof(fmt), "%%%d.%df", left_prec + right_prec + 1, 542 right_prec); 543 avalue_size = asprintf(&avalue, fmt, value); 544 if (avalue_size < 0) 545 return (NULL); 546 547 /* make sure that we've enough space for result string */ 548 bufsize = strlen(avalue)*2+1; 549 rslt = calloc(1, bufsize); 550 if (rslt == NULL) { 551 free(avalue); 552 return (NULL); 553 } 554 bufend = rslt + bufsize - 1; /* reserve space for trailing '\0' */ 555 556 /* skip spaces at beggining */ 557 padded = 0; 558 while (avalue[padded] == ' ') { 559 padded++; 560 avalue_size--; 561 } 562 563 if (right_prec > 0) { 564 bufend -= right_prec; 565 memcpy(bufend, avalue + avalue_size+padded-right_prec, 566 right_prec); 567 *--bufend = decimal_point; 568 avalue_size -= (right_prec + 1); 569 } 570 571 if ((*flags & NEED_GROUPING) && 572 thousands_sep != '\0' && /* XXX: need investigation */ 573 *grouping != CHAR_MAX && 574 *grouping > 0) { 575 while (avalue_size > (int)*grouping) { 576 GRPCPY(*grouping); 577 GRPSEP; 578 grouping++; 579 580 /* no more grouping ? */ 581 if (*grouping == CHAR_MAX) 582 break; 583 584 /* rest grouping with same value ? */ 585 if (*grouping == 0) { 586 grouping--; 587 while (avalue_size > *grouping) { 588 GRPCPY(*grouping); 589 GRPSEP; 590 } 591 } 592 } 593 if (avalue_size != 0) 594 GRPCPY(avalue_size); 595 padded -= groups; 596 597 } else { 598 bufend -= avalue_size; 599 memcpy(bufend, avalue+padded, avalue_size); 600 if (right_prec == 0) 601 padded--; /* decrease assumed $decimal_point */ 602 } 603 604 /* do padding with pad_char */ 605 if (padded > 0) { 606 bufend -= padded; 607 memset(bufend, pad_char, padded); 608 } 609 610 bufsize = bufsize - (bufend - rslt) + 1; 611 memmove(rslt, bufend, bufsize); 612 free(avalue); 613 return (rslt); 614 } 615