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/types.h> 29 #include <ctype.h> 30 #include <errno.h> 31 #include <limits.h> 32 #include <locale.h> 33 #include <monetary.h> 34 #include <stdarg.h> 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <string.h> 38 39 #include <errno_private.h> 40 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 if (VAR > INT_MAX / 10) \ 69 goto e2big_error; \ 70 VAR *= 10; \ 71 VAR += *fmt - '0'; \ 72 if (VAR < 0) \ 73 goto e2big_error; \ 74 fmt++; \ 75 } \ 76 } while (0) 77 78 #define GRPCPY(howmany) do { \ 79 int i = howmany; \ 80 while (i-- > 0) { \ 81 avalue_size--; \ 82 *--bufend = *(avalue+avalue_size+padded); \ 83 } \ 84 } while (0) 85 86 #define GRPSEP do { \ 87 *--bufend = thousands_sep; \ 88 groups++; \ 89 } while (0) 90 91 92 static void __setup_vars(int, char *, char *, char *, char **); 93 static int __calc_left_pad(int, char *); 94 static char *__format_grouped_double(double, int *, int, int, int); 95 96 97 ssize_t 98 strfmon(char *s, size_t maxsize, const char *format, 99 ...) 100 { 101 va_list ap; 102 char *dst; /* output destination pointer */ 103 const char *fmt; /* current format poistion pointer */ 104 struct lconv *lc; /* pointer to lconv structure */ 105 char *asciivalue; /* formatted double pointer */ 106 107 int flags; /* formatting options */ 108 int pad_char; /* padding character */ 109 int pad_size; /* pad size */ 110 int width; /* field width */ 111 int left_prec; /* left precision */ 112 int right_prec; /* right precision */ 113 double value; /* just value */ 114 char space_char = ' '; /* space after currency */ 115 116 char cs_precedes, /* values gathered from struct lconv */ 117 sep_by_space, 118 sign_posn, 119 *signstr, 120 *currency_symbol; 121 122 char *tmpptr; /* temporary vars */ 123 int sverrno; 124 125 va_start(ap, format); 126 127 lc = localeconv(); 128 dst = s; 129 fmt = format; 130 asciivalue = NULL; 131 currency_symbol = NULL; 132 pad_size = 0; 133 134 while (*fmt) { 135 /* pass nonformating characters AS IS */ 136 if (*fmt != '%') 137 goto literal; 138 139 /* '%' found ! */ 140 141 /* "%%" mean just '%' */ 142 if (*(fmt+1) == '%') { 143 fmt++; 144 literal: 145 PRINT(*fmt++); 146 continue; 147 } 148 149 /* set up initial values */ 150 flags = (NEED_GROUPING|LOCALE_POSN); 151 pad_char = ' '; /* padding character is "space" */ 152 left_prec = -1; /* no left precision specified */ 153 right_prec = -1; /* no right precision specified */ 154 width = -1; /* no width specified */ 155 value = 0; /* we have no value to print now */ 156 157 /* Flags */ 158 while (1) { 159 switch (*++fmt) { 160 case '=': /* fill character */ 161 pad_char = *++fmt; 162 if (pad_char == '\0') 163 goto format_error; 164 continue; 165 case '^': /* not group currency */ 166 flags &= ~(NEED_GROUPING); 167 continue; 168 case '+': /* use locale defined signs */ 169 if (flags & SIGN_POSN_USED) 170 goto format_error; 171 flags |= (SIGN_POSN_USED|LOCALE_POSN); 172 continue; 173 case '(': /* enclose negatives with () */ 174 if (flags & SIGN_POSN_USED) 175 goto format_error; 176 flags |= (SIGN_POSN_USED|PARENTH_POSN); 177 continue; 178 case '!': /* suppress currency symbol */ 179 flags |= SUPRESS_CURR_SYMBOL; 180 continue; 181 case '-': /* alignment (left) */ 182 flags |= LEFT_JUSTIFY; 183 continue; 184 default: 185 break; 186 } 187 break; 188 } 189 190 /* field Width */ 191 if (isdigit((unsigned char)*fmt)) { 192 GET_NUMBER(width); 193 /* Do we have enough space to put number with 194 * required width ? 195 */ 196 if ((unsigned int)width >= maxsize - (dst - s)) 197 goto e2big_error; 198 } 199 200 /* Left precision */ 201 if (*fmt == '#') { 202 if (!isdigit((unsigned char)*++fmt)) 203 goto format_error; 204 GET_NUMBER(left_prec); 205 if ((unsigned int)left_prec >= maxsize - (dst - s)) 206 goto e2big_error; 207 } 208 209 /* Right precision */ 210 if (*fmt == '.') { 211 if (!isdigit((unsigned char)*++fmt)) 212 goto format_error; 213 GET_NUMBER(right_prec); 214 if ((unsigned int)right_prec >= maxsize - (dst - s) - left_prec) 215 goto e2big_error; 216 } 217 218 /* Conversion Characters */ 219 switch (*fmt++) { 220 case 'i': /* use internaltion currency format */ 221 flags |= USE_INTL_CURRENCY; 222 break; 223 case 'n': /* use national currency format */ 224 flags &= ~(USE_INTL_CURRENCY); 225 break; 226 default: /* required character is missing or 227 premature EOS */ 228 goto format_error; 229 } 230 231 if (currency_symbol != NULL) 232 free(currency_symbol); 233 if (flags & USE_INTL_CURRENCY) { 234 currency_symbol = strdup(lc->int_curr_symbol); 235 if (currency_symbol != NULL) { 236 space_char = currency_symbol[3]; 237 currency_symbol[3] = '\0'; 238 } 239 } else 240 currency_symbol = strdup(lc->currency_symbol); 241 242 if (currency_symbol == NULL) 243 goto end_error; /* ENOMEM. */ 244 245 /* value itself */ 246 value = va_arg(ap, double); 247 248 /* detect sign */ 249 if (value < 0) { 250 flags |= IS_NEGATIVE; 251 value = -value; 252 } 253 254 /* fill left_prec with amount of padding chars */ 255 if (left_prec >= 0) { 256 pad_size = __calc_left_pad((flags ^ IS_NEGATIVE), 257 currency_symbol) - __calc_left_pad(flags, currency_symbol); 258 if (pad_size < 0) 259 pad_size = 0; 260 } 261 262 if (asciivalue != NULL) 263 free(asciivalue); 264 asciivalue = __format_grouped_double(value, &flags, left_prec, 265 right_prec, pad_char); 266 if (asciivalue == NULL) 267 goto end_error; /* errno already set */ 268 /* to ENOMEM by malloc() */ 269 270 /* set some variables for later use */ 271 __setup_vars(flags, &cs_precedes, &sep_by_space, &sign_posn, &signstr); 272 273 /* 274 * Description of some LC_MONETARY's values: 275 * 276 * p_cs_precedes & n_cs_precedes 277 * 278 * = 1 - $currency_symbol precedes the value 279 * for a monetary quantity with a non-negative value 280 * = 0 - symbol succeeds the value 281 * 282 * p_sep_by_space & n_sep_by_space 283 * 284 * = 0 - no space separates $currency_symbol 285 * from the value for a monetary quantity with a 286 * non-negative value 287 * = 1 - space separates the symbol from the value 288 * = 2 - space separates the symbol and the sign string, 289 * if adjacent. 290 * 291 * p_sign_posn & n_sign_posn 292 * 293 * = 0 - parentheses enclose the quantity and the 294 * $currency_symbol 295 * = 1 - the sign string precedes the quantity and the 296 * $currency_symbol 297 * = 2 - the sign string succeeds the quantity and the 298 * $currency_symbol 299 * = 3 - the sign string precedes the $currency_symbol 300 * = 4 - the sign string succeeds the $currency_symbol 301 * 302 */ 303 304 tmpptr = dst; 305 306 while (pad_size-- > 0) 307 PRINT(' '); 308 309 if (sign_posn == 0 && (flags & IS_NEGATIVE)) 310 PRINT('('); 311 312 if (cs_precedes == 1) { 313 if (sign_posn == 1 || sign_posn == 3) { 314 PRINTS(signstr); 315 if (sep_by_space == 2) /* XXX: ? */ 316 PRINT(' '); 317 } 318 319 if (!(flags & SUPRESS_CURR_SYMBOL)) { 320 PRINTS(currency_symbol); 321 322 if (sign_posn == 4) { 323 if (sep_by_space == 2) 324 PRINT(space_char); 325 PRINTS(signstr); 326 if (sep_by_space == 1) 327 PRINT(' '); 328 } else if (sep_by_space == 1) 329 PRINT(space_char); 330 } 331 } else if (sign_posn == 1) 332 PRINTS(signstr); 333 334 PRINTS(asciivalue); 335 336 if (cs_precedes == 0) { 337 if (sign_posn == 3) { 338 if (sep_by_space == 1) 339 PRINT(' '); 340 PRINTS(signstr); 341 } 342 343 if (!(flags & SUPRESS_CURR_SYMBOL)) { 344 if ((sign_posn == 3 && sep_by_space == 2) 345 || (sep_by_space == 1 346 && (sign_posn == 0 347 || sign_posn == 1 348 || sign_posn == 2 349 || sign_posn == 4))) 350 PRINT(space_char); 351 PRINTS(currency_symbol); /* XXX: len */ 352 if (sign_posn == 4) { 353 if (sep_by_space == 2) 354 PRINT(' '); 355 PRINTS(signstr); 356 } 357 } 358 } 359 360 if (sign_posn == 2) { 361 if (sep_by_space == 2) 362 PRINT(' '); 363 PRINTS(signstr); 364 } 365 366 if (sign_posn == 0 && (flags & IS_NEGATIVE)) 367 PRINT(')'); 368 369 if (dst - tmpptr < width) { 370 if (flags & LEFT_JUSTIFY) { 371 while (dst - tmpptr < width) 372 PRINT(' '); 373 } else { 374 pad_size = dst - tmpptr; 375 memmove(tmpptr + width - pad_size, tmpptr, pad_size); 376 memset(tmpptr, ' ', width - pad_size); 377 dst += width - pad_size; 378 } 379 } 380 } 381 382 PRINT('\0'); 383 va_end(ap); 384 free(asciivalue); 385 free(currency_symbol); 386 return dst - s - 1; /* return size of put data except trailing '\0' */ 387 388 e2big_error: 389 __set_errno(E2BIG); 390 goto end_error; 391 392 format_error: 393 __set_errno(EINVAL); 394 395 end_error: 396 sverrno = errno; 397 if (asciivalue != NULL) 398 free(asciivalue); 399 if (currency_symbol != NULL) 400 free(currency_symbol); 401 __set_errno(sverrno); 402 va_end(ap); 403 return -1; 404 } 405 406 407 static void 408 __setup_vars(int flags, char *cs_precedes, char *sep_by_space, char *sign_posn, 409 char **signstr) 410 { 411 struct lconv *lc = localeconv(); 412 413 if ((flags & IS_NEGATIVE) && (flags & USE_INTL_CURRENCY)) { 414 *cs_precedes = lc->int_n_cs_precedes; 415 *sep_by_space = lc->int_n_sep_by_space; 416 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->int_n_sign_posn; 417 *signstr = (lc->negative_sign[0] == '\0') ? "-" : lc->negative_sign; 418 } else if (flags & USE_INTL_CURRENCY) { 419 *cs_precedes = lc->int_p_cs_precedes; 420 *sep_by_space = lc->int_p_sep_by_space; 421 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->int_p_sign_posn; 422 *signstr = lc->positive_sign; 423 } else if (flags & IS_NEGATIVE) { 424 *cs_precedes = lc->n_cs_precedes; 425 *sep_by_space = lc->n_sep_by_space; 426 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->n_sign_posn; 427 *signstr = (lc->negative_sign[0] == '\0') ? "-" : lc->negative_sign; 428 } else { 429 *cs_precedes = lc->p_cs_precedes; 430 *sep_by_space = lc->p_sep_by_space; 431 *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->p_sign_posn; 432 *signstr = lc->positive_sign; 433 } 434 435 /* Set defult values for unspecified information. */ 436 if (*cs_precedes != 0) 437 *cs_precedes = 1; 438 if (*sep_by_space == CHAR_MAX) 439 *sep_by_space = 0; 440 if (*sign_posn == CHAR_MAX) 441 *sign_posn = 0; 442 } 443 444 445 static int 446 __calc_left_pad(int flags, char *cur_symb) 447 { 448 char cs_precedes, sep_by_space, sign_posn, *signstr; 449 int left_chars = 0; 450 451 __setup_vars(flags, &cs_precedes, &sep_by_space, &sign_posn, &signstr); 452 453 if (cs_precedes != 0) { 454 left_chars += strlen(cur_symb); 455 if (sep_by_space != 0) 456 left_chars++; 457 } 458 459 switch (sign_posn) { 460 case 1: 461 left_chars += strlen(signstr); 462 break; 463 case 3: 464 case 4: 465 if (cs_precedes != 0) 466 left_chars += strlen(signstr); 467 } 468 return left_chars; 469 } 470 471 472 static int 473 get_groups(int size, char *grouping) 474 { 475 int chars = 0; 476 477 if (*grouping == CHAR_MAX || *grouping <= 0) /* no grouping ? */ 478 return 0; 479 480 while (size > (int)*grouping) { 481 chars++; 482 size -= (int)*grouping++; 483 /* no more grouping ? */ 484 if (*grouping == CHAR_MAX) 485 break; 486 /* rest grouping with same value ? */ 487 if (*grouping == 0) { 488 chars += (size - 1) / *(grouping - 1); 489 break; 490 } 491 } 492 return chars; 493 } 494 495 496 /* convert double to ASCII */ 497 static char * 498 __format_grouped_double(double value, int *flags, int left_prec, int right_prec, 499 int pad_char) 500 { 501 char *rslt; 502 char *avalue; 503 int avalue_size; 504 char fmt[32]; 505 506 size_t bufsize; 507 char *bufend; 508 509 int padded; 510 511 struct lconv *lc = localeconv(); 512 char *grouping; 513 char decimal_point; 514 char thousands_sep; 515 516 int groups = 0; 517 518 grouping = lc->mon_grouping; 519 decimal_point = *lc->mon_decimal_point; 520 if (decimal_point == '\0') 521 decimal_point = *lc->decimal_point; 522 thousands_sep = *lc->mon_thousands_sep; 523 if (thousands_sep == '\0') 524 thousands_sep = *lc->thousands_sep; 525 526 /* fill left_prec with default value */ 527 if (left_prec == -1) 528 left_prec = 0; 529 530 /* fill right_prec with default value */ 531 if (right_prec == -1) { 532 if (*flags & USE_INTL_CURRENCY) 533 right_prec = lc->int_frac_digits; 534 else 535 right_prec = lc->frac_digits; 536 537 if (right_prec == CHAR_MAX) /* POSIX locale ? */ 538 right_prec = 2; 539 } 540 541 if (*flags & NEED_GROUPING) 542 left_prec += get_groups(left_prec, grouping); 543 544 /* convert to string */ 545 snprintf(fmt, sizeof(fmt), "%%%d.%df", left_prec + right_prec + 1, 546 right_prec); 547 avalue_size = asprintf(&avalue, fmt, value); 548 if (avalue_size < 0) 549 return NULL; 550 551 /* make sure that we've enough space for result string */ 552 bufsize = strlen(avalue) * 2 + 1; 553 rslt = calloc(1, bufsize); 554 if (rslt == NULL) { 555 free(avalue); 556 return NULL; 557 } 558 bufend = rslt + bufsize - 1; /* reserve space for trailing '\0' */ 559 560 /* skip spaces at beggining */ 561 padded = 0; 562 while (avalue[padded] == ' ') { 563 padded++; 564 avalue_size--; 565 } 566 567 if (right_prec > 0) { 568 bufend -= right_prec; 569 memcpy(bufend, avalue + avalue_size + padded - right_prec, right_prec); 570 *--bufend = decimal_point; 571 avalue_size -= right_prec + 1; 572 } 573 574 if ((*flags & NEED_GROUPING) && *grouping != CHAR_MAX && *grouping > 0 575 && thousands_sep != '\0') { 576 while (avalue_size > (int)*grouping) { 577 GRPCPY(*grouping); 578 GRPSEP; 579 grouping++; 580 581 /* no more grouping ? */ 582 if (*grouping == CHAR_MAX) 583 break; 584 585 /* rest grouping with same value ? */ 586 if (*grouping == 0) { 587 grouping--; 588 while (avalue_size > *grouping) { 589 GRPCPY(*grouping); 590 GRPSEP; 591 } 592 } 593 } 594 if (avalue_size != 0) 595 GRPCPY(avalue_size); 596 padded -= groups; 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); 613 614 return rslt; 615 } 616