1 /*- 2 * Copyright (c) 2001 Alexey Zelkin 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 #if defined(LIBC_RCS) && !defined(lint) 29 static char rcsid[] = "$FreeBSD$"; 30 #endif 31 32 #include <sys/types.h> 33 #include <ctype.h> 34 #include <errno.h> 35 #include <limits.h> 36 #include <locale.h> 37 #if __STDC__ 38 #include <stdarg.h> 39 #else 40 #include <varargs.h> 41 #endif 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 46 /* internal flags */ 47 #define NEED_GROUPING 0x01 /* print digits grouped (default) */ 48 #define SIGN_POSN_USED 0x02 /* '+' or '(' usage flag */ 49 #define LOCALE_POSN 0x04 /* use locale defined +/- (default) */ 50 #define PARENTH_POSN 0x08 /* enclose negative amount in () */ 51 #define SUPRESS_CURR_SYMBOL 0x10 /* supress the currency from output */ 52 #define LEFT_JUSTIFY 0x20 /* left justify */ 53 #define USE_INTL_CURRENCY 0x40 /* use international currency symbol */ 54 #define IS_NEGATIVE 0x80 /* is argument value negative ? */ 55 56 /* internal macros */ 57 #define PRINT(CH) { \ 58 if (dst >= s + maxsize) \ 59 goto e2big_error; \ 60 *dst++ = CH; \ 61 } 62 63 #define PRINTS(STR) { \ 64 char *tmps = STR; \ 65 while (*tmps != '\0') \ 66 PRINT(*tmps++); \ 67 } 68 69 #define GET_NUMBER(VAR) { \ 70 VAR = 0; \ 71 while (isdigit((unsigned char)*fmt)) { \ 72 VAR *= 10; \ 73 VAR += *fmt - '0'; \ 74 fmt++; \ 75 } \ 76 } 77 78 static void __setup_vars(int, char *, char *, char *, char **); 79 static int __calc_left_pad(int, char *); 80 static char *__format_grouped_double(double, int *, int, int, int); 81 82 #if __STDC__ 83 ssize_t 84 strfmon(char *s, size_t maxsize, const char *format, ...) 85 #else 86 ssize_t 87 strfmon(s, maxsize, format, va_alist) 88 char *s; 89 size_t maxsize; 90 const char *format; 91 va_dcl 92 #endif 93 { 94 va_list ap; 95 char *dst; /* output destination pointer */ 96 const char *fmt; /* current format poistion pointer */ 97 struct lconv *lc; /* pointer to lconv structure */ 98 char *asciivalue; /* formatted double pointer */ 99 100 int flags; /* formatting options */ 101 int pad_char; /* padding character */ 102 int pad_size; /* pad size */ 103 int width; /* field width */ 104 int left_prec; /* left precision */ 105 int right_prec; /* right precision */ 106 double value; /* just value */ 107 char space_char = ' '; /* space after currency */ 108 109 char cs_precedes, /* values gathered from struct lconv */ 110 sep_by_space, 111 sign_posn, 112 *signstr, 113 *currency_symbol; 114 115 char *tmpptr; /* temporary vars */ 116 int *ntmp; 117 118 #if __STDC__ 119 va_start(ap, format); 120 #else 121 va_start(ap); 122 #endif 123 124 lc = localeconv(); 125 dst = s; 126 fmt = format; 127 asciivalue = NULL; 128 currency_symbol = NULL; 129 pad_size = 0; 130 131 while (*fmt) { 132 133 /* pass nonformating characters AS IS */ 134 if (*fmt != '%') { 135 goto literal; 136 } 137 138 /* '%' found ! */ 139 140 /* "%%" mean just '%' */ 141 if (*(fmt+1) == '%') { 142 fmt++; 143 literal: 144 PRINT(*fmt++); 145 continue; 146 } 147 148 /* set up initial values */ 149 flags = (NEED_GROUPING|LOCALE_POSN); 150 pad_char = ' '; /* padding character is "space" */ 151 left_prec = -1; /* no left precision specified */ 152 right_prec = -1; /* no right precision specified */ 153 width = -1; /* no width specified */ 154 value = 0; /* we have no value to print now */ 155 156 /* Flags */ 157 while (1) { 158 switch (*++fmt) { 159 case '=': /* fill character */ 160 pad_char = *++fmt; 161 if (pad_char == '\0') 162 goto format_error; 163 continue; 164 case '^': /* not group currency */ 165 flags &= ~(NEED_GROUPING); 166 continue; 167 case '+': /* use locale defined signs */ 168 if (flags & SIGN_POSN_USED) 169 goto format_error; 170 flags |= (SIGN_POSN_USED|LOCALE_POSN); 171 continue; 172 case '(': /* enclose negatives with () */ 173 if (flags & SIGN_POSN_USED) 174 goto format_error; 175 flags |= (SIGN_POSN_USED|PARENTH_POSN); 176 continue; 177 case '!': /* suppress currency symbol */ 178 flags |= SUPRESS_CURR_SYMBOL; 179 continue; 180 case '-': /* alignment (left) */ 181 flags |= LEFT_JUSTIFY; 182 continue; 183 case '#': /* left || right precision */ 184 case '.': 185 if (*fmt == '#') 186 ntmp = &left_prec; 187 else 188 ntmp = &right_prec; 189 190 if (!isdigit((unsigned char)*++fmt)) 191 goto format_error; 192 GET_NUMBER(*ntmp); 193 fmt--; 194 continue; 195 default: 196 break; 197 } 198 break; 199 } 200 201 /* field Width */ 202 if (isdigit((unsigned char)*fmt)) { 203 GET_NUMBER(width); 204 /* Do we have enough space to put number with 205 * required width ? 206 */ 207 if (dst + width >= s + maxsize) 208 goto e2big_error; 209 } 210 211 /* Conversion Characters */ 212 switch (*fmt++) { 213 case 'i': /* use internaltion currency format */ 214 flags |= USE_INTL_CURRENCY; 215 break; 216 case 'n': /* use national currency format */ 217 flags &= ~(USE_INTL_CURRENCY); 218 break; 219 default: /* required character is missing or 220 premature EOS */ 221 goto format_error; 222 } 223 224 if (flags & USE_INTL_CURRENCY) { 225 currency_symbol = strdup(lc->int_curr_symbol); 226 if (currency_symbol != NULL) 227 space_char = *(currency_symbol+3); 228 } 229 else 230 currency_symbol = strdup(lc->currency_symbol); 231 232 if (currency_symbol == NULL) 233 goto end_error; /* ENOMEM. */ 234 235 /* value itself */ 236 value = va_arg(ap, double); 237 238 /* detect sign */ 239 if (value < 0) { 240 flags |= IS_NEGATIVE; 241 value = -value; 242 } 243 244 /* fill left_prec with amount of padding chars */ 245 if (left_prec >= 0) { 246 pad_size = __calc_left_pad((flags ^ IS_NEGATIVE), 247 currency_symbol) - 248 __calc_left_pad(flags, currency_symbol); 249 if (pad_size < 0) 250 pad_size = 0; 251 } 252 253 asciivalue = __format_grouped_double(value, &flags, 254 left_prec, right_prec, pad_char); 255 if (asciivalue == NULL) 256 goto end_error; /* errno already set */ 257 /* to ENOMEM by malloc() */ 258 259 /* set some variables for later use */ 260 __setup_vars(flags, &cs_precedes, &sep_by_space, 261 &sign_posn, &signstr); 262 263 /* 264 * Description of some LC_MONETARY's values: 265 * 266 * p_cs_precedes & n_cs_precedes 267 * 268 * = 1 - $currency_symbol precedes the value 269 * for a monetary quantity with a non-negative value 270 * = 0 - symbol succeeds the value 271 * 272 * p_sep_by_space & n_sep_by_space 273 * 274 * = 0 - no space separates $currency_symbol 275 * from the value for a monetary quantity with a 276 * non-negative value 277 * = 1 - space separates the symbol from the value 278 * = 2 - space separates the symbol and the sign string, 279 * if adjacent. 280 * 281 * p_sign_posn & n_sign_posn 282 * 283 * = 0 - parentheses enclose the quantity and the 284 * $currency_symbol 285 * = 1 - the sign string precedes the quantity and the 286 * $currency_symbol 287 * = 2 - the sign string succeeds the quantity and the 288 * $currency_symbol 289 * = 3 - the sign string precedes the $currency_symbol 290 * = 4 - the sign string succeeds the $currency_symbol 291 * 292 */ 293 294 tmpptr = dst; 295 296 while (pad_size-- > 0) 297 PRINT(' '); 298 299 if (sign_posn == 0) { 300 if (flags & IS_NEGATIVE) { 301 PRINT('('); 302 } else { 303 PRINT(' '); 304 } 305 } 306 307 if (cs_precedes == 1) { 308 if (sign_posn == 1 || sign_posn == 3) { 309 PRINTS(signstr); 310 if (sep_by_space == 2) /* XXX: ? */ 311 PRINT(' '); 312 } 313 314 if (!(flags & SUPRESS_CURR_SYMBOL)) { 315 PRINTS(currency_symbol); 316 317 if (sign_posn == 4) { 318 if (sep_by_space == 2) 319 PRINT(space_char); 320 PRINTS (signstr); 321 if (sep_by_space == 1) 322 PRINT(' '); 323 } 324 else 325 if (sep_by_space == 1) 326 PRINT(space_char); 327 } 328 } 329 else 330 if (sign_posn == 1) 331 PRINTS(signstr); 332 333 PRINTS(asciivalue); 334 335 if (cs_precedes == 0) { 336 if (sign_posn == 3) { 337 if (sep_by_space == 1) 338 PRINT(' '); 339 PRINTS(signstr); 340 } 341 342 if (!(flags & SUPRESS_CURR_SYMBOL)) { 343 if ((sign_posn == 3 && sep_by_space == 2) 344 || (sep_by_space == 1 345 && (sign_posn = 0 346 || sign_posn == 1 347 || sign_posn == 2 348 || sign_posn == 4))) 349 PRINT(space_char); 350 PRINTS(currency_symbol); /* XXX: len */ 351 if (sign_posn == 4) { 352 if (sep_by_space == 2) 353 PRINT(' '); 354 PRINTS(signstr); 355 } 356 } 357 } 358 359 if (sign_posn == 2) { 360 if (sep_by_space == 2) 361 PRINT(' '); 362 PRINTS(signstr); 363 } 364 365 if (sign_posn == 0 && (flags & IS_NEGATIVE)) 366 PRINT(')'); 367 368 if (dst - tmpptr < width) { 369 if (flags & LEFT_JUSTIFY) { 370 while (dst - tmpptr <= width) 371 PRINT(' '); 372 } else { 373 pad_size = dst-tmpptr; 374 memmove(tmpptr+width-pad_size, tmpptr, pad_size); 375 memset(tmpptr, ' ', width-pad_size); 376 dst += width-pad_size; 377 } 378 } 379 } 380 381 PRINT('\0'); 382 va_end(ap); 383 return (dst - s - 1); /* return size of put data except trailing '\0' */ 384 385 e2big_error: 386 errno = E2BIG; 387 goto end_error; 388 389 format_error: 390 errno = EINVAL; 391 392 end_error: 393 if (asciivalue != NULL) 394 free(asciivalue); 395 if (currency_symbol != NULL) 396 free(currency_symbol); 397 va_end(ap); 398 return (-1); 399 } 400 401 static void 402 __setup_vars(int flags, char *cs_precedes, char *sep_by_space, 403 char *sign_posn, char **signstr) { 404 405 struct lconv *lc = localeconv(); 406 407 if (flags & IS_NEGATIVE) { 408 *cs_precedes = lc->n_cs_precedes; 409 *sep_by_space = lc->n_sep_by_space; 410 *sign_posn = (flags & PARENTH_POSN)? 0 : lc->n_sign_posn; 411 *signstr = (lc->negative_sign == '\0')? "-" : lc->negative_sign; 412 } else { 413 *cs_precedes = lc->p_cs_precedes; 414 *sep_by_space = lc->p_sep_by_space; 415 *sign_posn = (flags & PARENTH_POSN)? 0 : lc->p_sign_posn; 416 *signstr = lc->positive_sign; 417 } 418 419 /* Set defult values for unspecified information. */ 420 if (*cs_precedes != 0) 421 *cs_precedes = 1; 422 if (*sep_by_space == CHAR_MAX) 423 *sep_by_space = 0; 424 if (*sign_posn == CHAR_MAX) 425 *sign_posn = 0; 426 } 427 428 static int 429 __calc_left_pad(int flags, char *cur_symb) { 430 431 char cs_precedes, sep_by_space, sign_posn, *signstr; 432 int left_chars = 0; 433 434 __setup_vars(flags, &cs_precedes, &sep_by_space, &sign_posn, &signstr); 435 436 if (cs_precedes != 0) { 437 left_chars += strlen(cur_symb); 438 if (sep_by_space != 0) 439 left_chars++; 440 } 441 442 switch (sign_posn) { 443 case 1: 444 left_chars += strlen(signstr); 445 break; 446 case 3: 447 case 4: 448 if (cs_precedes != 0) 449 left_chars += strlen(signstr); 450 } 451 return left_chars; 452 } 453 454 static int 455 get_groups(int size, char *grouping) { 456 457 int chars = 0; 458 459 if (*grouping == CHAR_MAX || *grouping <= 0) /* no grouping ? */ 460 return 0; 461 462 while (size > (int)*grouping) { 463 chars++; 464 size -= (int)*grouping++; 465 /* no more grouping ? */ 466 if (*grouping == CHAR_MAX) 467 break; 468 /* rest grouping with same value ? */ 469 if (*grouping == 0) { 470 chars += (size - 1) / *(grouping - 1); 471 break; 472 } 473 } 474 return chars; 475 } 476 477 /* convert double to ASCII */ 478 static char * 479 __format_grouped_double(double value, int *flags, 480 int left_prec, int right_prec, int pad_char) { 481 482 char *rslt; 483 char *avalue; 484 int avalue_size; 485 char fmt[32]; 486 487 size_t bufsize; 488 char *bufend; 489 490 int padded; 491 492 struct lconv *lc = localeconv(); 493 char *grouping; 494 char decimal_point; 495 char thousands_sep; 496 497 int groups = 0; 498 499 grouping = lc->mon_grouping; 500 decimal_point = *lc->mon_decimal_point; 501 if (decimal_point == '\0') { 502 decimal_point = *lc->decimal_point; 503 if (decimal_point == '\0') 504 decimal_point = '.'; 505 } 506 thousands_sep = *lc->mon_thousands_sep; 507 if (thousands_sep == '\0') { 508 thousands_sep = *lc->thousands_sep; 509 } 510 511 /* fill left_prec with default value */ 512 if (left_prec == -1) 513 left_prec = 0; 514 515 /* fill right_prec with default value */ 516 if (right_prec == -1) { 517 if (*flags & USE_INTL_CURRENCY) 518 right_prec = lc->int_frac_digits; 519 else 520 right_prec = lc->frac_digits; 521 522 if (right_prec == CHAR_MAX) /* POSIX locale ? */ 523 right_prec = 2; 524 } 525 526 if (*flags & NEED_GROUPING) 527 left_prec += get_groups(left_prec, grouping); 528 529 /* convert to string */ 530 snprintf(fmt, sizeof(fmt), "%%%d.%df", left_prec+right_prec+1, right_prec); 531 avalue_size = asprintf(&avalue, fmt, value); 532 if (avalue_size < 0) 533 return NULL; 534 535 /* make sure that we've enough space for result string */ 536 bufsize = strlen(avalue)*2+1; 537 rslt = malloc(bufsize); 538 if (rslt == NULL) { 539 free(avalue); 540 return NULL; 541 } 542 memset(rslt, 0, bufsize); 543 bufend = rslt + bufsize - 1; /* reserve space for trailing '\0' */ 544 545 /* skip spaces at beggining */ 546 padded = 0; 547 while (avalue[padded] == ' ') { 548 padded++; 549 avalue_size--; 550 } 551 552 if (right_prec > 0) { 553 bufend -= right_prec; 554 memcpy(bufend, avalue+avalue_size+padded-right_prec, right_prec); 555 *--bufend = decimal_point; 556 avalue_size -= (right_prec + 1); 557 } 558 559 if ((*flags & NEED_GROUPING) && 560 thousands_sep != '\0' && /* XXX: need investigation */ 561 *grouping != CHAR_MAX && 562 *grouping > 0) { 563 564 #define GRPCPY(howmany) { \ 565 int i = howmany; \ 566 while (i-- > 0) { \ 567 avalue_size--; \ 568 *--bufend = *(avalue+avalue_size+padded); \ 569 } \ 570 } 571 572 #define GRPSEP { \ 573 *--bufend = thousands_sep; \ 574 groups++; \ 575 } 576 577 while (avalue_size > (int)*grouping) { 578 GRPCPY(*grouping); 579 GRPSEP; 580 grouping++; 581 582 /* no more grouping ? */ 583 if (*grouping == CHAR_MAX) 584 break; 585 586 /* rest grouping with same value ? */ 587 if (*grouping == 0) { 588 grouping--; 589 while (avalue_size > *grouping) { 590 GRPCPY(*grouping); 591 GRPSEP; 592 } 593 } 594 } 595 if (avalue_size != 0) 596 GRPCPY(avalue_size); 597 padded -= groups; 598 599 } else { 600 bufend -= avalue_size; 601 memcpy(bufend, avalue+padded, avalue_size); 602 if (right_prec == 0) 603 padded--; /* decrease assumed $decimal_point */ 604 } 605 606 /* do padding with pad_char */ 607 if (padded > 0) { 608 bufend -= padded; 609 memset(bufend, pad_char, padded); 610 } 611 612 bufsize = bufsize-(rslt-bufend); 613 memmove(rslt, bufend, bufsize); 614 free(avalue); 615 return rslt; 616 } 617