2 * general implementation of scanf used by scanf, sscanf, fscanf,
3 * _cscanf, wscanf, swscanf and fwscanf
5 * Copyright 1996,1998 Marcus Meissner
6 * Copyright 1996 Jukka Iivonen
7 * Copyright 1997,2000, 2003 Uwe Bonnes
8 * Copyright 2000 Jon Griffiths
9 * Copyright 2002 Daniel Gudbjartsson
11 * This library is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU Lesser General Public
13 * License as published by the Free Software Foundation; either
14 * version 2.1 of the License, or (at your option) any later version.
16 * This library is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * Lesser General Public License for more details.
21 * You should have received a copy of the GNU Lesser General Public
22 * License along with this library; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
27 #define _CHAR_ MSVCRT_wchar_t
28 #define _EOF_ MSVCRT_WEOF
29 #define _EOF_RET MSVCRT_WEOF
30 #define _ISSPACE_(c) MSVCRT_iswspace(c)
31 #define _ISDIGIT_(c) MSVCRT_iswdigit(c)
32 #define _WIDE2SUPPORTED_(c) c /* No conversion needed (wide to wide) */
33 #define _CHAR2SUPPORTED_(c) c /* FIXME: convert char to wide char */
34 #define _CHAR2DIGIT_(c, base) wchar2digit((c), (base))
35 #define _BITMAPSIZE_ 256*256
36 #else /* WIDE_SCANF */
38 #define _EOF_ MSVCRT_EOF
39 #define _EOF_RET MSVCRT_EOF
40 #define _ISSPACE_(c) isspace(c)
41 #define _ISDIGIT_(c) isdigit(c)
42 #define _WIDE2SUPPORTED_(c) c /* FIXME: convert wide char to char */
43 #define _CHAR2SUPPORTED_(c) c /* No conversion needed (char to char) */
44 #define _CHAR2DIGIT_(c, base) char2digit((c), (base))
45 #define _BITMAPSIZE_ 256
46 #endif /* WIDE_SCANF */
49 #define _GETC_(file) (consumed++, _getch())
50 #define _UNGETC_(nch, file) do { _ungetch(nch); consumed--; } while(0)
51 #define _LOCK_FILE_(file) MSVCRT__lock_file(MSVCRT_stdin)
52 #define _UNLOCK_FILE_(file) MSVCRT__unlock_file(MSVCRT_stdin)
55 #define _FUNCTION_ static int MSVCRT_vcwscanf_s_l(const char *format, MSVCRT__locale_t locale, __ms_va_list ap)
57 #define _FUNCTION_ static int MSVCRT_vcwscanf_l(const char *format, MSVCRT__locale_t locale, __ms_va_list ap)
59 #else /* WIDE_SCANF */
61 #define _FUNCTION_ static int MSVCRT_vcscanf_s_l(const char *format, MSVCRT__locale_t locale, __ms_va_list ap)
63 #define _FUNCTION_ static int MSVCRT_vcscanf_l(const char *format, MSVCRT__locale_t locale, __ms_va_list ap)
65 #endif /* WIDE_SCANF */
71 #define _GETC_(file) (consumed==length ? '\0' : (consumed++, *file++))
72 #define _UNGETC_(nch, file) do { file--; consumed--; } while(0)
73 #define _LOCK_FILE_(file) do {} while(0)
74 #define _UNLOCK_FILE_(file) do {} while(0)
77 #define _FUNCTION_ static int MSVCRT_vsnwscanf_s_l(const MSVCRT_wchar_t *file, MSVCRT_size_t length, const MSVCRT_wchar_t *format, MSVCRT__locale_t locale, __ms_va_list ap)
79 #define _FUNCTION_ static int MSVCRT_vsnwscanf_l(const MSVCRT_wchar_t *file, MSVCRT_size_t length, const MSVCRT_wchar_t *format, MSVCRT__locale_t locale, __ms_va_list ap)
81 #else /* WIDE_SCANF */
83 #define _FUNCTION_ static int MSVCRT_vsnscanf_s_l(const char *file, MSVCRT_size_t length, const char *format, MSVCRT__locale_t locale, __ms_va_list ap)
85 #define _FUNCTION_ static int MSVCRT_vsnscanf_l(const char *file, MSVCRT_size_t length, const char *format, MSVCRT__locale_t locale, __ms_va_list ap)
87 #endif /* WIDE_SCANF */
88 #else /* STRING_LEN */
89 #define _GETC_(file) (consumed++, *file++)
90 #define _UNGETC_(nch, file) do { file--; consumed--; } while(0)
91 #define _LOCK_FILE_(file) do {} while(0)
92 #define _UNLOCK_FILE_(file) do {} while(0)
95 #define _FUNCTION_ static int MSVCRT_vswscanf_s_l(const MSVCRT_wchar_t *file, const MSVCRT_wchar_t *format, MSVCRT__locale_t locale, __ms_va_list ap)
97 #define _FUNCTION_ static int MSVCRT_vswscanf_l(const MSVCRT_wchar_t *file, const MSVCRT_wchar_t *format, MSVCRT__locale_t locale, __ms_va_list ap)
99 #else /* WIDE_SCANF */
101 #define _FUNCTION_ static int MSVCRT_vsscanf_s_l(const char *file, const char *format, MSVCRT__locale_t locale, __ms_va_list ap)
103 #define _FUNCTION_ static int MSVCRT_vsscanf_l(const char *file, const char *format, MSVCRT__locale_t locale, __ms_va_list ap)
105 #endif /* WIDE_SCANF */
106 #endif /* STRING_LEN */
109 #define _GETC_(file) (consumed++, MSVCRT_fgetwc(file))
110 #define _UNGETC_(nch, file) do { MSVCRT_ungetwc(nch, file); consumed--; } while(0)
111 #define _LOCK_FILE_(file) MSVCRT__lock_file(file)
112 #define _UNLOCK_FILE_(file) MSVCRT__unlock_file(file)
114 #define _FUNCTION_ static int MSVCRT_vfwscanf_s_l(MSVCRT_FILE* file, const MSVCRT_wchar_t *format, MSVCRT__locale_t locale, __ms_va_list ap)
116 #define _FUNCTION_ static int MSVCRT_vfwscanf_l(MSVCRT_FILE* file, const MSVCRT_wchar_t *format, MSVCRT__locale_t locale, __ms_va_list ap)
118 #else /* WIDE_SCANF */
119 #define _GETC_(file) (consumed++, MSVCRT_fgetc(file))
120 #define _UNGETC_(nch, file) do { MSVCRT_ungetc(nch, file); consumed--; } while(0)
121 #define _LOCK_FILE_(file) MSVCRT__lock_file(file)
122 #define _UNLOCK_FILE_(file) MSVCRT__unlock_file(file)
124 #define _FUNCTION_ static int MSVCRT_vfscanf_s_l(MSVCRT_FILE* file, const char *format, MSVCRT__locale_t locale, __ms_va_list ap)
126 #define _FUNCTION_ static int MSVCRT_vfscanf_l(MSVCRT_FILE* file, const char *format, MSVCRT__locale_t locale, __ms_va_list ap)
128 #endif /* WIDE_SCANF */
133 MSVCRT_pthreadlocinfo locinfo;
134 int rd = 0, consumed = 0;
136 if (!*format) return 0;
139 TRACE("(%s):\n", debugstr_a(format));
142 TRACE("%s (%s)\n", debugstr_a(file), debugstr_a(format));
144 TRACE("%p (%s)\n", file, debugstr_a(format));
147 #endif /* WIDE_SCANF */
157 locinfo = get_locinfo();
159 locinfo = locale->locinfo;
162 /* a whitespace character in the format string causes scanf to read,
163 * but not store, all consecutive white-space characters in the input
164 * up to the next non-white-space character. One white space character
165 * in the input matches any number (including zero) and combination of
166 * white-space characters in the input. */
167 if (_ISSPACE_(*format)) {
168 /* skip whitespace */
169 while ((nch!=_EOF_) && _ISSPACE_(nch))
172 /* a format specification causes scanf to read and convert characters
173 * in the input into values of a specified type. The value is assigned
174 * to an argument in the argument list. Format specifications have
175 * the form %[*][width][{h | l | I64 | L}]type */
176 else if (*format == '%') {
177 int st = 0; int suppress = 0; int width = 0;
183 int prefix_finished = 0;
186 /* look for leading asterisk, which means 'suppress assignment of
192 /* look for width specification */
193 while (_ISDIGIT_(*format)) {
195 width+=*format++ - '0';
197 if (width==0) width=-1; /* no width spec seen */
198 /* read prefix (if any) */
199 while (!prefix_finished) {
201 case 'h': h_prefix = 1; break;
202 case 'l': l_prefix = 1; break;
203 case 'w': w_prefix = 1; break;
204 case 'L': L_prefix = 1; break;
206 if (*(format + 1) == '6' &&
207 *(format + 2) == '4') {
215 if (!prefix_finished) format++;
220 case 'P': /* pointer. */
221 if (sizeof(void *) == sizeof(LONGLONG)) I64_prefix = 1;
224 case 'X': /* hexadecimal integer. */
227 case 'o': /* octal integer */
230 case 'u': /* unsigned decimal integer */
233 case 'd': /* signed decimal integer */
236 case 'i': /* generic integer */
239 /* read an integer */
243 /* skip initial whitespace */
244 while ((nch!=_EOF_) && _ISSPACE_(nch))
247 if (nch == '-' || nch == '+') {
248 negative = (nch=='-');
250 if (width>0) width--;
252 /* look for leading indication of base */
253 if (width!=0 && nch == '0' && *format != 'p' && *format != 'P') {
255 if (width>0) width--;
257 if (width!=0 && (nch=='x' || nch=='X')) {
262 if (width>0) width--;
268 /* format %i without indication of base */
271 /* throw away leading zeros */
272 while (width!=0 && nch=='0') {
274 if (width>0) width--;
277 if (width!=0 && _CHAR2DIGIT_(nch, base)!=-1) {
278 cur = _CHAR2DIGIT_(nch, base);
280 if (width>0) width--;
283 /* read until no more digits */
284 while (width!=0 && (nch!=_EOF_) && _CHAR2DIGIT_(nch, base)!=-1) {
285 cur = cur*base + _CHAR2DIGIT_(nch, base);
287 if (width>0) width--;
291 if (!seendigit) break; /* not a valid number */
294 #define _SET_NUMBER_(type) *va_arg(ap, type*) = negative ? -cur : cur
295 if (I64_prefix) _SET_NUMBER_(LONGLONG);
296 else if (l_prefix) _SET_NUMBER_(LONG);
297 else if (h_prefix) _SET_NUMBER_(short int);
298 else _SET_NUMBER_(int);
306 case 'G': { /* read a float */
309 /* skip initial whitespace */
310 while ((nch!=_EOF_) && _ISSPACE_(nch))
313 if (nch == '-' || nch == '+') {
314 negative = (nch=='-');
315 if (width>0) width--;
319 /* get first digit. */
320 if (*locinfo->lconv->decimal_point != nch) {
321 if (!_ISDIGIT_(nch)) break;
324 if (width>0) width--;
325 /* read until no more digits */
326 while (width!=0 && (nch!=_EOF_) && _ISDIGIT_(nch)) {
327 cur = cur*10 + (nch - '0');
329 if (width>0) width--;
332 cur = 0; /* Fix: .8 -> 0.8 */
334 /* handle decimals */
335 if (width!=0 && nch == *locinfo->lconv->decimal_point) {
338 if (width>0) width--;
339 while (width!=0 && (nch!=_EOF_) && _ISDIGIT_(nch)) {
341 cur += dec * (nch - '0');
343 if (width>0) width--;
346 /* handle exponent */
347 if (width!=0 && (nch == 'e' || nch == 'E')) {
348 int exponent = 0, negexp = 0;
351 if (width>0) width--;
352 /* possible sign on the exponent */
353 if (width!=0 && (nch=='+' || nch=='-')) {
356 if (width>0) width--;
358 /* exponent digits */
359 while (width!=0 && (nch!=_EOF_) && _ISDIGIT_(nch)) {
361 exponent += (nch - '0');
363 if (width>0) width--;
365 /* update 'cur' with this exponent. */
366 expcnt = negexp ? .1 : 10;
367 while (exponent!=0) {
371 expcnt=expcnt*expcnt;
376 if (L_prefix) _SET_NUMBER_(long double);
377 else if (l_prefix) _SET_NUMBER_(double);
378 else _SET_NUMBER_(float);
382 /* According to msdn,
383 * 's' reads a character string in a call to fscanf
384 * and 'S' a wide character string and vice versa in a
385 * call to fwscanf. The 'h', 'w' and 'l' prefixes override
386 * this behaviour. 'h' forces reading char * but 'l' and 'w'
387 * force reading WCHAR. */
389 if (w_prefix || l_prefix) goto widecharstring;
390 else if (h_prefix) goto charstring;
392 else goto widecharstring;
393 #else /* WIDE_SCANF */
394 else goto charstring;
395 #endif /* WIDE_SCANF */
397 if (w_prefix || l_prefix) goto widecharstring;
398 else if (h_prefix) goto charstring;
400 else goto charstring;
401 #else /* WIDE_SCANF */
402 else goto widecharstring;
403 #endif /* WIDE_SCANF */
404 charstring: { /* read a word into a char */
405 char *sptr = suppress ? NULL : va_arg(ap, char*);
406 char *sptr_beg = sptr;
408 unsigned size = suppress ? UINT_MAX : va_arg(ap, unsigned);
410 unsigned size = UINT_MAX;
412 /* skip initial whitespace */
413 while ((nch!=_EOF_) && _ISSPACE_(nch))
415 /* read until whitespace */
416 while (width!=0 && (nch!=_EOF_) && !_ISSPACE_(nch)) {
418 *sptr++ = _CHAR2SUPPORTED_(nch);
428 if (width>0) width--;
431 if (!suppress) *sptr = 0;
434 widecharstring: { /* read a word into a wchar_t* */
435 MSVCRT_wchar_t *sptr = suppress ? NULL : va_arg(ap, MSVCRT_wchar_t*);
436 MSVCRT_wchar_t *sptr_beg = sptr;
438 unsigned size = suppress ? UINT_MAX : va_arg(ap, unsigned);
440 unsigned size = UINT_MAX;
442 /* skip initial whitespace */
443 while ((nch!=_EOF_) && _ISSPACE_(nch))
445 /* read until whitespace */
446 while (width!=0 && (nch!=_EOF_) && !_ISSPACE_(nch)) {
448 *sptr++ = _WIDE2SUPPORTED_(nch);
458 if (width>0) width--;
461 if (!suppress) *sptr = 0;
464 /* 'c' and 'C work analogously to 's' and 'S' as described
467 if (w_prefix || l_prefix) goto widecharacter;
468 else if (h_prefix) goto character;
470 else goto widecharacter;
471 #else /* WIDE_SCANF */
473 #endif /* WIDE_SCANF */
475 if (w_prefix || l_prefix) goto widecharacter;
476 else if (h_prefix) goto character;
479 #else /* WIDE_SCANF */
480 else goto widecharacter;
481 #endif /* WIDE_SCANF */
482 character: { /* read single character into char */
483 char *str = suppress ? NULL : va_arg(ap, char*);
486 unsigned size = suppress ? UINT_MAX : va_arg(ap, unsigned)/sizeof(char);
488 unsigned size = UINT_MAX;
490 if (width == -1) width = 1;
491 while (width && (nch != _EOF_))
494 *str++ = _CHAR2SUPPORTED_(nch);
508 widecharacter: { /* read single character into a wchar_t */
509 MSVCRT_wchar_t *str = suppress ? NULL : va_arg(ap, MSVCRT_wchar_t*);
510 MSVCRT_wchar_t *pstr = str;
512 unsigned size = suppress ? UINT_MAX : va_arg(ap, unsigned)/sizeof(MSVCRT_wchar_t);
514 unsigned size = UINT_MAX;
516 if (width == -1) width = 1;
517 while (width && (nch != _EOF_))
520 *str++ = _WIDE2SUPPORTED_(nch);
536 int*n = va_arg(ap, int*);
539 /* This is an odd one: according to the standard,
540 * "Execution of a %n directive does not increment the
541 * assignment count returned at the completion of
542 * execution" even if it wasn't suppressed with the
543 * '*' flag. The Corrigendum to the standard seems
544 * to contradict this (comment out the assignment to
545 * suppress below if you want to implement these
546 * alternate semantics) but the windows program I'm
547 * looking at expects the behavior I've coded here
548 * (which happens to be what glibc does as well).
555 _CHAR_ *str = suppress ? NULL : va_arg(ap, _CHAR_*);
559 int invert = 0; /* Set if we are NOT to find the chars */
561 unsigned size = suppress ? UINT_MAX : va_arg(ap, unsigned)/sizeof(_CHAR_);
563 unsigned size = UINT_MAX;
566 /* Init our bitmap */
567 Mask = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, _BITMAPSIZE_/8);
568 RtlInitializeBitMap(&bitMask, Mask, _BITMAPSIZE_);
570 /* Read the format */
577 RtlSetBits(&bitMask, ']', 1);
580 while(*format && (*format != ']')) {
581 /* According to msdn:
582 * "Note that %[a-z] and %[z-a] are interpreted as equivalent to %[abcde...z]." */
583 if((*format == '-') && (*(format + 1) != ']')) {
584 if ((*(format - 1)) < *(format + 1))
585 RtlSetBits(&bitMask, *(format - 1) +1 , *(format + 1) - *(format - 1));
587 RtlSetBits(&bitMask, *(format + 1) , *(format - 1) - *(format + 1));
590 RtlSetBits(&bitMask, *format, 1);
593 /* read until char is not suitable */
594 while ((width != 0) && (nch != _EOF_)) {
596 if(RtlAreBitsSet(&bitMask, nch, 1)) {
597 if (!suppress) *sptr++ = _CHAR2SUPPORTED_(nch);
601 if(RtlAreBitsClear(&bitMask, nch, 1)) {
602 if (!suppress) *sptr++ = _CHAR2SUPPORTED_(nch);
608 if (width>0) width--;
617 if (!suppress) *sptr = 0;
618 HeapFree(GetProcessHeap(), 0, Mask);
622 /* From spec: "if a percent sign is followed by a character
623 * that has no meaning as a format-control character, that
624 * character and the following characters are treated as
625 * an ordinary sequence of characters, that is, a sequence
626 * of characters that must match the input. For example,
627 * to specify that a percent-sign character is to be input,
629 while ((nch!=_EOF_) && _ISSPACE_(nch))
632 suppress = 1; /* whoops no field to be read */
633 st = 1; /* but we got what we expected */
638 if (st && !suppress) rd++;
641 /* a non-white-space character causes scanf to read, but not store,
642 * a matching non-white-space character. */
644 /* check for character match */
645 if (nch == *format) {
655 TRACE("returning %d\n", rd);
665 #undef _CHAR2SUPPORTED_
666 #undef _WIDE2SUPPORTED_