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1.10 ! christos 1: /* $NetBSD: strfmon.c,v 1.9 2012/03/13 21:13:48 christos Exp $ */
1.1 christos 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 $");
34: #else
1.10 ! christos 35: __RCSID("$NetBSD: strfmon.c,v 1.9 2012/03/13 21:13:48 christos Exp $");
1.1 christos 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>
1.9 christos 45: #include <assert.h>
1.1 christos 46: #include <ctype.h>
47: #include <errno.h>
48: #include <limits.h>
49: #include <locale.h>
50: #include <stdarg.h>
51: #include <stdio.h>
52: #include <stdlib.h>
53: #include <string.h>
1.6 christos 54: #include <stddef.h>
1.1 christos 55:
56: /* internal flags */
57: #define NEED_GROUPING 0x01 /* print digits grouped (default) */
58: #define SIGN_POSN_USED 0x02 /* '+' or '(' usage flag */
59: #define LOCALE_POSN 0x04 /* use locale defined +/- (default) */
60: #define PARENTH_POSN 0x08 /* enclose negative amount in () */
61: #define SUPRESS_CURR_SYMBOL 0x10 /* supress the currency from output */
62: #define LEFT_JUSTIFY 0x20 /* left justify */
63: #define USE_INTL_CURRENCY 0x40 /* use international currency symbol */
64: #define IS_NEGATIVE 0x80 /* is argument value negative ? */
65:
1.10 ! christos 66: #ifndef NBCHAR_MAX
! 67: #define NBCHAR_MAX ((unsigned char)CHAR_MAX)
! 68: #endif
! 69:
1.1 christos 70: /* internal macros */
71: #define PRINT(CH) do { \
72: if (dst >= s + maxsize) \
73: goto e2big_error; \
74: *dst++ = CH; \
75: } while (/* CONSTCOND */ 0)
76:
77: #define PRINTS(STR) do { \
1.3 yamt 78: const char *tmps = STR; \
1.1 christos 79: while (*tmps != '\0') \
80: PRINT(*tmps++); \
81: } while (/* CONSTCOND */ 0)
82:
83: #define GET_NUMBER(VAR) do { \
1.6 christos 84: VAR = 0; \
1.1 christos 85: while (isdigit((unsigned char)*fmt)) { \
86: VAR *= 10; \
87: VAR += *fmt - '0'; \
1.6 christos 88: if (VAR > 0x00ffffff) \
1.5 christos 89: goto e2big_error; \
1.1 christos 90: fmt++; \
91: } \
92: } while (/* CONSTCOND */ 0)
93:
94: #define GRPCPY(howmany) do { \
95: int i = howmany; \
96: while (i-- > 0) { \
97: avalue_size--; \
98: *--bufend = *(avalue+avalue_size+padded); \
99: } \
100: } while (/* CONSTCOND */ 0)
101:
102: #define GRPSEP do { \
103: *--bufend = thousands_sep; \
104: groups++; \
105: } while (/* CONSTCOND */ 0)
106:
1.3 yamt 107: static void __setup_vars(int, char *, char *, char *, const char **);
1.1 christos 108: static int __calc_left_pad(int, char *);
109: static char *__format_grouped_double(double, int *, int, int, int);
110:
111: ssize_t
112: strfmon(char * __restrict s, size_t maxsize, const char * __restrict format,
113: ...)
114: {
115: va_list ap;
116: char *dst; /* output destination pointer */
117: const char *fmt; /* current format poistion pointer */
118: struct lconv *lc; /* pointer to lconv structure */
119: char *asciivalue; /* formatted double pointer */
120:
121: int flags; /* formatting options */
122: int pad_char; /* padding character */
123: int pad_size; /* pad size */
124: int width; /* field width */
125: int left_prec; /* left precision */
126: int right_prec; /* right precision */
127: double value; /* just value */
128: char space_char = ' '; /* space after currency */
129:
130: char cs_precedes, /* values gathered from struct lconv */
131: sep_by_space,
132: sign_posn,
133: *currency_symbol;
1.3 yamt 134: const char *signstr;
1.1 christos 135:
136: char *tmpptr; /* temporary vars */
137: int sverrno;
138:
139: va_start(ap, format);
140:
141: lc = localeconv();
142: dst = s;
143: fmt = format;
144: asciivalue = NULL;
145: currency_symbol = NULL;
146: pad_size = 0;
147:
148: while (*fmt) {
149: /* pass nonformating characters AS IS */
150: if (*fmt != '%')
151: goto literal;
152:
153: /* '%' found ! */
154:
155: /* "%%" mean just '%' */
156: if (*(fmt+1) == '%') {
157: fmt++;
158: literal:
159: PRINT(*fmt++);
160: continue;
161: }
162:
163: /* set up initial values */
164: flags = (NEED_GROUPING|LOCALE_POSN);
165: pad_char = ' '; /* padding character is "space" */
166: left_prec = -1; /* no left precision specified */
167: right_prec = -1; /* no right precision specified */
168: width = -1; /* no width specified */
169: value = 0; /* we have no value to print now */
170:
171: /* Flags */
172: while (/* CONSTCOND */ 1) {
173: switch (*++fmt) {
174: case '=': /* fill character */
175: pad_char = *++fmt;
176: if (pad_char == '\0')
177: goto format_error;
178: continue;
179: case '^': /* not group currency */
180: flags &= ~(NEED_GROUPING);
181: continue;
182: case '+': /* use locale defined signs */
183: if (flags & SIGN_POSN_USED)
184: goto format_error;
185: flags |= (SIGN_POSN_USED|LOCALE_POSN);
186: continue;
187: case '(': /* enclose negatives with () */
188: if (flags & SIGN_POSN_USED)
189: goto format_error;
190: flags |= (SIGN_POSN_USED|PARENTH_POSN);
191: continue;
192: case '!': /* suppress currency symbol */
193: flags |= SUPRESS_CURR_SYMBOL;
194: continue;
195: case '-': /* alignment (left) */
196: flags |= LEFT_JUSTIFY;
197: continue;
198: default:
199: break;
200: }
201: break;
202: }
203:
204: /* field Width */
205: if (isdigit((unsigned char)*fmt)) {
1.6 christos 206: ptrdiff_t d = dst - s;
1.1 christos 207: GET_NUMBER(width);
208: /* Do we have enough space to put number with
209: * required width ?
210: */
1.6 christos 211:
1.7 lukem 212: if ((size_t)(d + width) >= maxsize)
1.1 christos 213: goto e2big_error;
214: }
215:
216: /* Left precision */
217: if (*fmt == '#') {
218: if (!isdigit((unsigned char)*++fmt))
219: goto format_error;
220: GET_NUMBER(left_prec);
221: }
222:
223: /* Right precision */
224: if (*fmt == '.') {
225: if (!isdigit((unsigned char)*++fmt))
226: goto format_error;
227: GET_NUMBER(right_prec);
228: }
229:
230: /* Conversion Characters */
231: switch (*fmt++) {
232: case 'i': /* use internaltion currency format */
233: flags |= USE_INTL_CURRENCY;
234: break;
235: case 'n': /* use national currency format */
236: flags &= ~(USE_INTL_CURRENCY);
237: break;
238: default: /* required character is missing or
239: premature EOS */
240: goto format_error;
241: }
242:
1.4 christos 243: if (currency_symbol)
244: free(currency_symbol);
1.1 christos 245: if (flags & USE_INTL_CURRENCY) {
246: currency_symbol = strdup(lc->int_curr_symbol);
247: if (currency_symbol != NULL)
248: space_char = *(currency_symbol+3);
249: } else
250: currency_symbol = strdup(lc->currency_symbol);
251:
252: if (currency_symbol == NULL)
253: goto end_error; /* ENOMEM. */
254:
255: /* value itself */
256: value = va_arg(ap, double);
257:
258: /* detect sign */
259: if (value < 0) {
260: flags |= IS_NEGATIVE;
261: value = -value;
262: }
263:
264: /* fill left_prec with amount of padding chars */
265: if (left_prec >= 0) {
266: pad_size = __calc_left_pad((flags ^ IS_NEGATIVE),
267: currency_symbol) -
268: __calc_left_pad(flags, currency_symbol);
269: if (pad_size < 0)
270: pad_size = 0;
271: }
272:
273: asciivalue = __format_grouped_double(value, &flags,
274: left_prec, right_prec, pad_char);
275: if (asciivalue == NULL)
276: goto end_error; /* errno already set */
277: /* to ENOMEM by malloc() */
278:
279: /* set some variables for later use */
280: __setup_vars(flags, &cs_precedes, &sep_by_space,
281: &sign_posn, &signstr);
282:
283: /*
284: * Description of some LC_MONETARY's values:
285: *
286: * p_cs_precedes & n_cs_precedes
287: *
288: * = 1 - $currency_symbol precedes the value
289: * for a monetary quantity with a non-negative value
290: * = 0 - symbol succeeds the value
291: *
292: * p_sep_by_space & n_sep_by_space
293: *
294: * = 0 - no space separates $currency_symbol
295: * from the value for a monetary quantity with a
296: * non-negative value
297: * = 1 - space separates the symbol from the value
298: * = 2 - space separates the symbol and the sign string,
299: * if adjacent.
300: *
301: * p_sign_posn & n_sign_posn
302: *
303: * = 0 - parentheses enclose the quantity and the
304: * $currency_symbol
305: * = 1 - the sign string precedes the quantity and the
306: * $currency_symbol
307: * = 2 - the sign string succeeds the quantity and the
308: * $currency_symbol
309: * = 3 - the sign string precedes the $currency_symbol
310: * = 4 - the sign string succeeds the $currency_symbol
311: *
312: */
313:
314: tmpptr = dst;
315:
316: while (pad_size-- > 0)
317: PRINT(' ');
318:
319: if (sign_posn == 0 && (flags & IS_NEGATIVE))
320: PRINT('(');
321:
322: if (cs_precedes == 1) {
323: if (sign_posn == 1 || sign_posn == 3) {
324: PRINTS(signstr);
325: if (sep_by_space == 2) /* XXX: ? */
326: PRINT(' ');
327: }
328:
329: if (!(flags & SUPRESS_CURR_SYMBOL)) {
330: PRINTS(currency_symbol);
331:
332: if (sign_posn == 4) {
333: if (sep_by_space == 2)
334: PRINT(space_char);
335: PRINTS(signstr);
336: if (sep_by_space == 1)
337: PRINT(' ');
338: } else if (sep_by_space == 1)
339: PRINT(space_char);
340: }
341: } else if (sign_posn == 1)
342: PRINTS(signstr);
343:
344: PRINTS(asciivalue);
345:
346: if (cs_precedes == 0) {
347: if (sign_posn == 3) {
348: if (sep_by_space == 1)
349: PRINT(' ');
350: PRINTS(signstr);
351: }
352:
353: if (!(flags & SUPRESS_CURR_SYMBOL)) {
354: if ((sign_posn == 3 && sep_by_space == 2)
355: || (sep_by_space == 1
356: && (sign_posn == 0
357: || sign_posn == 1
358: || sign_posn == 2
359: || sign_posn == 4)))
360: PRINT(space_char);
361: PRINTS(currency_symbol); /* XXX: len */
362: if (sign_posn == 4) {
363: if (sep_by_space == 2)
364: PRINT(' ');
365: PRINTS(signstr);
366: }
367: }
368: }
369:
370: if (sign_posn == 2) {
371: if (sep_by_space == 2)
372: PRINT(' ');
373: PRINTS(signstr);
374: }
375:
376: if (sign_posn == 0 && (flags & IS_NEGATIVE))
377: PRINT(')');
378:
379: if (dst - tmpptr < width) {
380: if (flags & LEFT_JUSTIFY) {
381: while (dst - tmpptr < width)
382: PRINT(' ');
383: } else {
1.9 christos 384: _DIAGASSERT(__type_fit(int, dst - tmpptr));
385: pad_size = dst - tmpptr;
1.1 christos 386: memmove(tmpptr + width-pad_size, tmpptr,
387: (size_t) pad_size);
388: memset(tmpptr, ' ', (size_t) width-pad_size);
389: dst += width-pad_size;
390: }
391: }
392: }
393:
394: PRINT('\0');
395: va_end(ap);
396: free(asciivalue);
397: free(currency_symbol);
398: return (dst - s - 1); /* return size of put data except trailing '\0' */
399:
400: e2big_error:
401: errno = E2BIG;
402: goto end_error;
403:
404: format_error:
405: errno = EINVAL;
406:
407: end_error:
408: sverrno = errno;
409: if (asciivalue != NULL)
410: free(asciivalue);
411: if (currency_symbol != NULL)
412: free(currency_symbol);
413: errno = sverrno;
414: va_end(ap);
415: return (-1);
416: }
417:
418: static void
419: __setup_vars(int flags, char *cs_precedes, char *sep_by_space,
1.3 yamt 420: char *sign_posn, const char **signstr) {
1.1 christos 421: struct lconv *lc = localeconv();
422:
423: if ((flags & IS_NEGATIVE) && (flags & USE_INTL_CURRENCY)) {
424: *cs_precedes = lc->int_n_cs_precedes;
425: *sep_by_space = lc->int_n_sep_by_space;
426: *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->int_n_sign_posn;
1.3 yamt 427: *signstr = (lc->negative_sign == '\0') ? "-"
1.1 christos 428: : lc->negative_sign;
429: } else if (flags & USE_INTL_CURRENCY) {
430: *cs_precedes = lc->int_p_cs_precedes;
431: *sep_by_space = lc->int_p_sep_by_space;
432: *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->int_p_sign_posn;
433: *signstr = lc->positive_sign;
434: } else if (flags & IS_NEGATIVE) {
435: *cs_precedes = lc->n_cs_precedes;
436: *sep_by_space = lc->n_sep_by_space;
437: *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->n_sign_posn;
1.3 yamt 438: *signstr = (lc->negative_sign == '\0') ? "-"
1.1 christos 439: : lc->negative_sign;
440: } else {
441: *cs_precedes = lc->p_cs_precedes;
442: *sep_by_space = lc->p_sep_by_space;
443: *sign_posn = (flags & PARENTH_POSN) ? 0 : lc->p_sign_posn;
444: *signstr = lc->positive_sign;
445: }
446:
447: /* Set defult values for unspecified information. */
448: if (*cs_precedes != 0)
449: *cs_precedes = 1;
1.10 ! christos 450: if ((unsigned char)*sep_by_space == NBCHAR_MAX)
1.1 christos 451: *sep_by_space = 0;
1.10 ! christos 452: if ((unsigned char)*sign_posn == NBCHAR_MAX)
1.1 christos 453: *sign_posn = 0;
454: }
455:
456: static int
457: __calc_left_pad(int flags, char *cur_symb) {
458:
1.3 yamt 459: char cs_precedes, sep_by_space, sign_posn;
460: const char *signstr;
1.9 christos 461: size_t left_chars = 0;
1.1 christos 462:
463: __setup_vars(flags, &cs_precedes, &sep_by_space, &sign_posn, &signstr);
464:
465: if (cs_precedes != 0) {
466: left_chars += strlen(cur_symb);
467: if (sep_by_space != 0)
468: left_chars++;
469: }
470:
471: switch (sign_posn) {
472: case 1:
473: left_chars += strlen(signstr);
474: break;
475: case 3:
476: case 4:
477: if (cs_precedes != 0)
478: left_chars += strlen(signstr);
479: }
1.9 christos 480: _DIAGASSERT(__type_fit(int, left_chars));
481: return (int)left_chars;
1.1 christos 482: }
483:
484: static int
485: get_groups(int size, char *grouping) {
486:
487: int chars = 0;
488:
1.10 ! christos 489: if ((unsigned char)*grouping == NBCHAR_MAX || *grouping <= 0) /* no grouping ? */
1.1 christos 490: return (0);
491:
492: while (size > (int)*grouping) {
493: chars++;
494: size -= (int)*grouping++;
495: /* no more grouping ? */
1.10 ! christos 496: if ((unsigned char)*grouping == NBCHAR_MAX)
1.1 christos 497: break;
498: /* rest grouping with same value ? */
499: if (*grouping == 0) {
500: chars += (size - 1) / *(grouping - 1);
501: break;
502: }
503: }
504: return (chars);
505: }
506:
507: /* convert double to ASCII */
508: static char *
509: __format_grouped_double(double value, int *flags,
510: int left_prec, int right_prec, int pad_char) {
511:
512: char *rslt;
513: char *avalue;
514: int avalue_size;
515:
516: size_t bufsize;
517: char *bufend;
518:
519: int padded;
520:
521: struct lconv *lc = localeconv();
522: char *grouping;
523: char decimal_point;
524: char thousands_sep;
525:
526: int groups = 0;
527:
528: grouping = lc->mon_grouping;
529: decimal_point = *lc->mon_decimal_point;
530: if (decimal_point == '\0')
531: decimal_point = *lc->decimal_point;
532: thousands_sep = *lc->mon_thousands_sep;
533: if (thousands_sep == '\0')
534: thousands_sep = *lc->thousands_sep;
535:
536: /* fill left_prec with default value */
537: if (left_prec == -1)
538: left_prec = 0;
539:
540: /* fill right_prec with default value */
541: if (right_prec == -1) {
542: if (*flags & USE_INTL_CURRENCY)
543: right_prec = lc->int_frac_digits;
544: else
545: right_prec = lc->frac_digits;
546:
547: if (right_prec == CHAR_MAX) /* POSIX locale ? */
548: right_prec = 2;
549: }
550:
551: if (*flags & NEED_GROUPING)
552: left_prec += get_groups(left_prec, grouping);
553:
554: /* convert to string */
1.8 christos 555: avalue_size = asprintf(&avalue, "%*.*f", left_prec + right_prec + 1,
556: right_prec, value);
1.1 christos 557: if (avalue_size < 0)
558: return (NULL);
559:
560: /* make sure that we've enough space for result string */
1.8 christos 561: bufsize = avalue_size * 2 + 1;
1.1 christos 562: rslt = malloc(bufsize);
563: if (rslt == NULL) {
564: free(avalue);
565: return (NULL);
566: }
567: memset(rslt, 0, bufsize);
568: bufend = rslt + bufsize - 1; /* reserve space for trailing '\0' */
569:
570: /* skip spaces at beggining */
571: padded = 0;
572: while (avalue[padded] == ' ') {
573: padded++;
574: avalue_size--;
575: }
576:
577: if (right_prec > 0) {
578: bufend -= right_prec;
579: memcpy(bufend, avalue + avalue_size+padded-right_prec,
580: (size_t) right_prec);
581: *--bufend = decimal_point;
582: avalue_size -= (right_prec + 1);
583: }
584:
1.8 christos 585: /* XXX: Why not use %' instead? */
1.1 christos 586: if ((*flags & NEED_GROUPING) &&
587: thousands_sep != '\0' && /* XXX: need investigation */
1.10 ! christos 588: (unsigned char)*grouping != NBCHAR_MAX &&
1.1 christos 589: *grouping > 0) {
590: while (avalue_size > (int)*grouping) {
591: GRPCPY(*grouping);
592: GRPSEP;
593: grouping++;
594:
595: /* no more grouping ? */
1.10 ! christos 596: if ((unsigned char)*grouping == NBCHAR_MAX)
1.1 christos 597: break;
598:
599: /* rest grouping with same value ? */
600: if (*grouping == 0) {
601: grouping--;
602: while (avalue_size > *grouping) {
603: GRPCPY(*grouping);
604: GRPSEP;
605: }
606: }
607: }
608: if (avalue_size != 0)
609: GRPCPY(avalue_size);
610: padded -= groups;
611:
612: } else {
613: bufend -= avalue_size;
614: memcpy(bufend, avalue+padded, (size_t) avalue_size);
615: if (right_prec == 0)
616: padded--; /* decrease assumed $decimal_point */
617: }
618:
619: /* do padding with pad_char */
620: if (padded > 0) {
621: bufend -= padded;
622: memset(bufend, pad_char, (size_t) padded);
623: }
624:
625: bufsize = bufsize - (bufend - rslt) + 1;
626: memmove(rslt, bufend, bufsize);
627: free(avalue);
628: return (rslt);
629: }