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 _FUNCTION_ static int MSVCRT_vcscanf(const char *format, va_list ap)
56 #define _GETC_(file) (consumed++, *file++)
57 #define _UNGETC_(nch, file) do { file--; consumed--; } while(0)
59 #define _FUNCTION_ static int MSVCRT_vswscanf(const MSVCRT_wchar_t *file, const MSVCRT_wchar_t *format, va_list ap)
60 #else /* WIDE_SCANF */
61 #define _FUNCTION_ static int MSVCRT_vsscanf(const char *file, const char *format, va_list ap)
62 #endif /* WIDE_SCANF */
65 #define _GETC_(file) (consumed++, MSVCRT_fgetwc(file))
66 #define _UNGETC_(nch, file) do { MSVCRT_ungetwc(nch, file); consumed--; } while(0)
67 #define _FUNCTION_ static int MSVCRT_vfwscanf(MSVCRT_FILE* file, const MSVCRT_wchar_t *format, va_list ap)
68 #else /* WIDE_SCANF */
69 #define _GETC_(file) (consumed++, MSVCRT_fgetc(file))
70 #define _UNGETC_(nch, file) do { MSVCRT_ungetc(nch, file); consumed--; } while(0)
71 #define _FUNCTION_ static int MSVCRT_vfscanf(MSVCRT_FILE* file, const char *format, va_list ap)
72 #endif /* WIDE_SCANF */
76 /*********************************************************************
77 * Implemented based on
78 * http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccore98/html/_crt_format_specification_fields_.2d_.scanf_and_wscanf_functions.asp
79 * Extended by C. Scott Ananian <cananian@alumni.princeton.edu> to handle
80 * more types of format spec.
83 int rd = 0, consumed = 0;
85 if (!*format) return 0;
88 TRACE("(%s): \n", debugstr_a(format));
91 TRACE("%s (%s)\n", file, debugstr_a(format));
93 TRACE("%p (%s)\n", file, debugstr_a(format));
96 #endif /* WIDE_SCANF */
98 if (nch == _EOF_) return _EOF_RET;
101 /* a whitespace character in the format string causes scanf to read,
102 * but not store, all consecutive white-space characters in the input
103 * up to the next non-white-space character. One white space character
104 * in the input matches any number (including zero) and combination of
105 * white-space characters in the input. */
106 if (_ISSPACE_(*format)) {
107 /* skip whitespace */
108 while ((nch!=_EOF_) && _ISSPACE_(nch))
111 /* a format specification causes scanf to read and convert characters
112 * in the input into values of a specified type. The value is assigned
113 * to an argument in the argument list. Format specifications have
114 * the form %[*][width][{h | l | I64 | L}]type */
115 else if (*format == '%') {
116 int st = 0; int suppress = 0; int width = 0;
122 int prefix_finished = 0;
125 /* look for leading asterisk, which means 'suppress assignment of
131 /* look for width specification */
132 while (_ISDIGIT_(*format)) {
134 width+=*format++ - '0';
136 if (width==0) width=-1; /* no width spec seen */
137 /* read prefix (if any) */
138 while (!prefix_finished) {
140 case 'h': h_prefix = 1; break;
141 case 'l': l_prefix = 1; break;
142 case 'w': w_prefix = 1; break;
143 case 'L': L_prefix = 1; break;
145 if (*(format + 1) == '6' &&
146 *(format + 2) == '4') {
154 if (!prefix_finished) format++;
159 case 'X': /* hexadecimal integer. */
162 case 'o': /* octal integer */
165 case 'u': /* unsigned decimal integer */
168 case 'd': /* signed decimal integer */
171 case 'i': /* generic integer */
174 /* read an integer */
178 /* skip initial whitespace */
179 while ((nch!=_EOF_) && _ISSPACE_(nch))
182 if (nch == '-' || nch == '+') {
183 negative = (nch=='-');
185 if (width>0) width--;
187 /* look for leading indication of base */
188 if (width!=0 && nch == '0') {
190 if (width>0) width--;
192 if (width!=0 && (nch=='x' || nch=='X')) {
197 if (width>0) width--;
203 /* format %i without indication of base */
206 /* throw away leading zeros */
207 while (width!=0 && nch=='0') {
209 if (width>0) width--;
212 if (width!=0 && _CHAR2DIGIT_(nch, base)!=-1) {
213 cur = _CHAR2DIGIT_(nch, base);
215 if (width>0) width--;
218 /* read until no more digits */
219 while (width!=0 && (nch!=_EOF_) && _CHAR2DIGIT_(nch, base)!=-1) {
220 cur = cur*base + _CHAR2DIGIT_(nch, base);
222 if (width>0) width--;
226 if (!seendigit) break; /* not a valid number */
229 #define _SET_NUMBER_(type) *va_arg(ap, type*) = negative ? -cur : cur
230 if (I64_prefix) _SET_NUMBER_(LONGLONG);
231 else if (l_prefix) _SET_NUMBER_(long int);
232 else if (h_prefix) _SET_NUMBER_(short int);
233 else _SET_NUMBER_(int);
241 case 'G': { /* read a float */
244 /* skip initial whitespace */
245 while ((nch!=_EOF_) && _ISSPACE_(nch))
248 if (nch == '-' || nch == '+') {
249 negative = (nch=='-');
250 if (width>0) width--;
254 /* get first digit. */
256 if (!_ISDIGIT_(nch)) break;
259 if (width>0) width--;
260 /* read until no more digits */
261 while (width!=0 && (nch!=_EOF_) && _ISDIGIT_(nch)) {
262 cur = cur*10 + (nch - '0');
264 if (width>0) width--;
267 cur = 0; /* MaxPayneDemo Fix: .8 -> 0.8 */
269 /* handle decimals */
270 if (width!=0 && nch == '.') {
273 if (width>0) width--;
274 while (width!=0 && (nch!=_EOF_) && _ISDIGIT_(nch)) {
276 cur += dec * (nch - '0');
278 if (width>0) width--;
281 /* handle exponent */
282 if (width!=0 && (nch == 'e' || nch == 'E')) {
283 int exponent = 0, negexp = 0;
286 if (width>0) width--;
287 /* possible sign on the exponent */
288 if (width!=0 && (nch=='+' || nch=='-')) {
291 if (width>0) width--;
293 /* exponent digits */
294 while (width!=0 && (nch!=_EOF_) && _ISDIGIT_(nch)) {
296 exponent += (nch - '0');
298 if (width>0) width--;
300 /* update 'cur' with this exponent. */
301 expcnt = negexp ? .1 : 10;
302 while (exponent!=0) {
306 expcnt=expcnt*expcnt;
311 if (L_prefix) _SET_NUMBER_(long double);
312 else if (l_prefix) _SET_NUMBER_(double);
313 else _SET_NUMBER_(float);
318 * http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclib/html/_crt_scanf_type_field_characters.asp
319 * 's' reads a character string in a call to fscanf
320 * and 'S' a wide character string and vice versa in a
321 * call to fwscanf. The 'h', 'w' and 'l' prefixes override
322 * this behaviour. 'h' forces reading char * but 'l' and 'w'
323 * force reading WCHAR. */
325 if (w_prefix || l_prefix) goto widecharstring;
326 else if (h_prefix) goto charstring;
328 else goto widecharstring;
329 #else /* WIDE_SCANF */
330 else goto charstring;
331 #endif /* WIDE_SCANF */
333 if (w_prefix || l_prefix) goto widecharstring;
334 else if (h_prefix) goto charstring;
336 else goto charstring;
337 #else /* WIDE_SCANF */
338 else goto widecharstring;
339 #endif /* WIDE_SCANF */
340 charstring: { /* read a word into a char */
341 char*str = suppress ? NULL : va_arg(ap, char*);
343 /* skip initial whitespace */
344 while ((nch!=_EOF_) && _ISSPACE_(nch))
346 /* read until whitespace */
347 while (width!=0 && (nch!=_EOF_) && !_ISSPACE_(nch)) {
348 if (!suppress) *sptr++ = _CHAR2SUPPORTED_(nch);
351 if (width>0) width--;
354 if (!suppress) *sptr = 0;
357 widecharstring: { /* read a word into a wchar_t* */
359 suppress ? NULL : va_arg(ap, MSVCRT_wchar_t*);
360 MSVCRT_wchar_t*sptr = str;
361 /* skip initial whitespace */
362 while ((nch!=_EOF_) && _ISSPACE_(nch))
364 /* read until whitespace */
365 while (width!=0 && (nch!=_EOF_) && !_ISSPACE_(nch)) {
366 if (!suppress) *sptr++ = _WIDE2SUPPORTED_(nch);
369 if (width>0) width--;
372 if (!suppress) *sptr = 0;
375 /* 'c' and 'C work analogously to 's' and 'S' as described
378 if (w_prefix || l_prefix) goto widecharacter;
379 else if (h_prefix) goto character;
381 else goto widecharacter;
382 #else /* WIDE_SCANF */
384 #endif /* WIDE_SCANF */
386 if (w_prefix || l_prefix) goto widecharacter;
387 else if (h_prefix) goto character;
390 #else /* WIDE_SCANF */
391 else goto widecharacter;
392 #endif /* WIDE_SCANF */
393 character: { /* read single character into char */
396 char*c = va_arg(ap, char*);
397 *c = _CHAR2SUPPORTED_(nch);
404 widecharacter: { /* read single character into a wchar_t */
407 MSVCRT_wchar_t*c = va_arg(ap, MSVCRT_wchar_t*);
408 *c = _WIDE2SUPPORTED_(nch);
417 int*n = va_arg(ap, int*);
418 *n = consumed - (nch!=_EOF_);
420 /* This is an odd one: according to the standard,
421 * "Execution of a %n directive does not increment the
422 * assignment count returned at the completion of
423 * execution" even if it wasn't suppressed with the
424 * '*' flag. The Corrigendum to the standard seems
425 * to contradict this (comment out the assignment to
426 * suppress below if you want to implement these
427 * alternate semantics) but the windows program I'm
428 * looking at expects the behavior I've coded here
429 * (which happens to be what glibc does as well).
436 _CHAR_ *str = suppress ? NULL : va_arg(ap, _CHAR_*);
440 int invert = 0; /* Set if we are NOT to find the chars */
442 /* Init our bitmap */
443 Mask = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, _BITMAPSIZE_/8);
444 RtlInitializeBitMap(&bitMask, Mask, _BITMAPSIZE_);
446 /* Read the format */
453 RtlSetBits(&bitMask, ']', 1);
456 while(*format && (*format != ']')) {
458 * http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccore98/html/_crt_scanf_width_specification.asp
459 * "Note that %[a-z] and %[z-a] are interpreted as equivalent to %[abcde...z]." */
460 if((*format == '-') && (*(format + 1) != ']')) {
461 if ((*(format - 1)) < *(format + 1))
462 RtlSetBits(&bitMask, *(format - 1) +1 , *(format + 1) - *(format - 1));
464 RtlSetBits(&bitMask, *(format + 1) , *(format - 1) - *(format + 1));
467 RtlSetBits(&bitMask, *format, 1);
470 /* read until char is not suitable */
471 while ((width != 0) && (nch != _EOF_)) {
473 if(RtlAreBitsSet(&bitMask, nch, 1)) {
474 if (!suppress) *sptr++ = _CHAR2SUPPORTED_(nch);
478 if(RtlAreBitsClear(&bitMask, nch, 1)) {
479 if (!suppress) *sptr++ = _CHAR2SUPPORTED_(nch);
485 if (width>0) width--;
488 if (!suppress) *sptr = 0;
489 HeapFree(GetProcessHeap(), 0, Mask);
493 /* From spec: "if a percent sign is followed by a character
494 * that has no meaning as a format-control character, that
495 * character and the following characters are treated as
496 * an ordinary sequence of characters, that is, a sequence
497 * of characters that must match the input. For example,
498 * to specify that a percent-sign character is to be input,
500 while ((nch!=_EOF_) && _ISSPACE_(nch))
503 suppress = 1; /* whoops no field to be read */
504 st = 1; /* but we got what we expected */
509 if (st && !suppress) rd++;
512 /* a non-white-space character causes scanf to read, but not store,
513 * a matching non-white-space character. */
515 /* check for character match */
516 if (nch == *format) {
525 TRACE("returning %d\n", rd);
534 #undef _CHAR2SUPPORTED_
535 #undef _WIDE2SUPPORTED_