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