| /* |
| * general implementation of scanf used by scanf, sscanf, fscanf, |
| * _cscanf, wscanf, swscanf and fwscanf |
| * |
| * Copyright 1996,1998 Marcus Meissner |
| * Copyright 1996 Jukka Iivonen |
| * Copyright 1997,2000 Uwe Bonnes |
| * Copyright 2000 Jon Griffiths |
| * Copyright 2002 Daniel Gudbjartsson |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| |
| #ifdef WIDE_SCANF |
| #define _L_(x) L##x |
| #define _CHAR_ WCHAR |
| #define _EOF_ MSVCRT_WEOF |
| #define _ISSPACE_(c) MSVCRT_iswspace(c) |
| #define _ISDIGIT_(c) MSVCRT_iswdigit(c) |
| #define _CONVERT_(c) c /*** FIXME ***/ |
| #define _CHAR2DIGIT_(c, base) wchar2digit((c), (base)) |
| #else /* WIDE_SCANF */ |
| #define _L_(x) x |
| #define _CHAR_ char |
| #define _EOF_ MSVCRT_EOF |
| #define _ISSPACE_(c) isspace(c) |
| #define _ISDIGIT_(c) isdigit(c) |
| #define _CONVERT_(c) c /*** FIXME ***/ |
| #define _CHAR2DIGIT_(c, base) char2digit((c), (base)) |
| #endif /* WIDE_SCANF */ |
| |
| #ifdef CONSOLE |
| #define _GETC_(file) _getch() |
| #define _UNGETC_(nch, file) _ungetch(nch) |
| #define _FUNCTION_ _cscanf(const _CHAR_ *format, ...) |
| #else |
| #ifdef STRING |
| #define _GETC_(file) *file++ |
| #define _UNGETC_(nch, file) file-- |
| #ifdef WIDE_SCANF |
| #define _FUNCTION_ MSVCRT_swscanf(const WCHAR *file, const WCHAR *format, ...) |
| #else /* WIDE_SCANF */ |
| #define _FUNCTION_ MSVCRT_sscanf(const char *file, const char *format, ...) |
| #endif /* WIDE_SCANF */ |
| #else /* STRING */ |
| #ifdef WIDE_SCANF |
| #define _GETC_(file) MSVCRT_fgetwc(file) |
| #define _UNGETC_(nch, file) MSVCRT_ungetwc(nch, file) |
| #define _FUNCTION_ MSVCRT_fwscanf(MSVCRT_FILE* file, const WCHAR *format, ...) |
| #else /* WIDE_SCANF */ |
| #define _GETC_(file) MSVCRT_fgetc(file) |
| #define _UNGETC_(nch, file) MSVCRT_ungetc(nch, file) |
| #define _FUNCTION_ MSVCRT_fscanf(MSVCRT_FILE* file, const char *format, ...) |
| #endif /* WIDE_SCANF */ |
| #endif /* STRING */ |
| #endif /* CONSOLE */ |
| |
| /********************************************************************* |
| * Implemented based on |
| * http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccore98/html/_crt_format_specification_fields_.2d_.scanf_and_wscanf_functions.asp |
| * Extended by C. Scott Ananian <cananian@alumni.princeton.edu> to handle |
| * more types of format spec. |
| */ |
| int _FUNCTION_ { |
| int rd = 0; |
| int nch; |
| va_list ap; |
| if (!*format) return 0; |
| #ifndef WIDE_SCANF |
| #ifdef CONSOLE |
| WARN("(\"%s\"): semi-stub\n", format); |
| #else /* CONSOLE */ |
| #ifdef STRING |
| WARN("%s (\"%s\"): semi-stub\n", file, format); |
| #else /* STRING */ |
| WARN("%p (\"%s\"): semi-stub\n", file, format); |
| #endif /* STRING */ |
| #endif /* CONSOLE */ |
| #endif /* WIDE_SCANF */ |
| nch = _GETC_(file); |
| va_start(ap, format); |
| while (*format) { |
| /* a whitespace character in the format string causes scanf to read, |
| * but not store, all consecutive white-space characters in the input |
| * up to the next non-white-space character. One white space character |
| * in the input matches any number (including zero) and combination of |
| * white-space characters in the input. */ |
| if (_ISSPACE_(*format)) { |
| /* skip whitespace */ |
| while ((nch!=_EOF_) && _ISSPACE_(nch)) |
| nch = _GETC_(file); |
| } |
| /* a format specification causes scanf to read and convert characters |
| * in the input into values of a specified type. The value is assigned |
| * to an argument in the argument list. Format specifications have |
| * the form %[*][width][{h | l | I64 | L}]type */ |
| else if (*format == _L_('%')) { |
| int st = 0; int suppress = 0; int width = 0; |
| int base, number_signed; |
| int h_prefix = 0; |
| int l_prefix = 0; |
| int L_prefix = 0; |
| int w_prefix = 0; |
| int prefix_finished = 0; |
| /* int I64_prefix = 0; */ |
| format++; |
| /* look for leading asterisk, which means 'suppress assignment of |
| * this field'. */ |
| if (*format==_L_('*')) { |
| format++; |
| suppress=1; |
| } |
| /* look for width specification */ |
| while (_ISDIGIT_(*format)) { |
| width*=10; |
| width+=*format++ - _L_('0'); |
| } |
| if (width==0) width=-1; /* no width spec seen */ |
| /* read prefix (if any) */ |
| while (!prefix_finished) { |
| switch(*format) { |
| case _L_('h'): h_prefix = 1; break; |
| case _L_('l'): l_prefix = 1; break; |
| case _L_('w'): w_prefix = 1; break; |
| case _L_('L'): L_prefix = 1; break; |
| case _L_('I'): |
| if (*(format + 1) == _L_('6') && |
| *(format + 2) == _L_('4')) { |
| /* I64_prefix = 1; */ |
| format += 2; |
| FIXME("I64 prefix currently not implemented in fscanf/fwscanf"); |
| } |
| break; |
| default: |
| prefix_finished = 1; |
| } |
| if (!prefix_finished) format++; |
| } |
| /* read type */ |
| switch(*format) { |
| case _L_('%'): { /* read a percent symbol */ |
| while ((nch!=_EOF_) && _ISSPACE_(nch)) |
| nch = _GETC_(file); |
| if (nch==_L_('%')) { |
| suppress = 1; /* whoops no field to be read */ |
| st = 1; /* but we got what we expected */ |
| nch = _GETC_(file); |
| } |
| } |
| break; |
| case _L_('x'): |
| case _L_('X'): /* hexadecimal integer. */ |
| base = 16; number_signed = 0; |
| goto number; |
| case _L_('o'): /* octal integer */ |
| base = 8; number_signed = 0; |
| goto number; |
| case _L_('u'): /* unsigned decimal integer */ |
| base = 10; number_signed = 0; |
| goto number; |
| case _L_('d'): /* signed decimal integer */ |
| base = 10; number_signed = 1; |
| goto number; |
| case _L_('i'): /* generic integer */ |
| base = 0; number_signed = 1; |
| number: { |
| /* read an integer */ |
| long unsigned int cur = 0; |
| int negative = 0; |
| int seendigit=0; |
| /* skip initial whitespace */ |
| while ((nch!=_EOF_) && _ISSPACE_(nch)) |
| nch = _GETC_(file); |
| /* get sign */ |
| if (number_signed && (nch == _L_('-') || |
| nch == _L_('+'))) { |
| negative = (nch==_L_('-')); |
| nch = _GETC_(file); |
| if (width>0) width--; |
| } |
| /* look for leading indication of base */ |
| if (width!=0 && nch == _L_('0')) { |
| nch = _GETC_(file); |
| if (width>0) width--; |
| seendigit=1; |
| if (width!=0 && (nch==_L_('x') || nch==_L_('X'))) { |
| if (base==0) |
| base=16; |
| if (base==16) { |
| nch = _GETC_(file); |
| if (width>0) width--; |
| seendigit=0; |
| } |
| } else if (base==0) |
| base = 8; |
| } |
| /* throw away leading zeros */ |
| while (width!=0 && nch==_L_('0')) { |
| nch = _GETC_(file); |
| if (width>0) width--; |
| seendigit=1; |
| } |
| if (width!=0 && _CHAR2DIGIT_(nch, base)!=-1) { |
| cur = _CHAR2DIGIT_(nch, base); |
| nch = _GETC_(file); |
| if (width>0) width--; |
| seendigit=1; |
| } |
| /* read until no more digits */ |
| while (width!=0 && (nch!=_EOF_) && _CHAR2DIGIT_(nch, base)!=-1) { |
| cur = cur*base + _CHAR2DIGIT_(nch, base); |
| nch = _GETC_(file); |
| if (width>0) width--; |
| seendigit=1; |
| } |
| /* okay, done! */ |
| if (!seendigit) break; /* not a valid number */ |
| st = 1; |
| if (!suppress) { |
| #define _SET_NUMBER_(type) *va_arg(ap, type*) = negative ? -cur : cur |
| if (number_signed) { |
| if (l_prefix) _SET_NUMBER_(long int); |
| else if (h_prefix) _SET_NUMBER_(short int); |
| else _SET_NUMBER_(int); |
| } else { |
| if (negative) { |
| WARN("Dropping sign in reading a negative number into an unsigned value"); |
| negative = 0; |
| } |
| if (l_prefix) _SET_NUMBER_(unsigned long int); |
| else if (h_prefix) |
| _SET_NUMBER_(unsigned short int); |
| else _SET_NUMBER_(unsigned int); |
| } |
| } |
| } |
| break; |
| case _L_('e'): |
| case _L_('E'): |
| case _L_('f'): |
| case _L_('g'): |
| case _L_('G'): { /* read a float */ |
| long double cur = 0; |
| int negative = 0; |
| /* skip initial whitespace */ |
| while ((nch!=_EOF_) && _ISSPACE_(nch)) |
| nch = _GETC_(file); |
| /* get sign. */ |
| if (nch == _L_('-') || nch == _L_('+')) { |
| negative = (nch==_L_('-')); |
| if (width>0) width--; |
| if (width==0) break; |
| nch = _GETC_(file); |
| } |
| /* get first digit. */ |
| if (!_ISDIGIT_(nch)) break; |
| cur = (nch - _L_('0')) * (negative ? -1 : 1); |
| nch = _GETC_(file); |
| if (width>0) width--; |
| /* read until no more digits */ |
| while (width!=0 && (nch!=_EOF_) && _ISDIGIT_(nch)) { |
| cur = cur*10 + (nch - _L_('0')); |
| nch = _GETC_(file); |
| if (width>0) width--; |
| } |
| /* handle decimals */ |
| if (width!=0 && nch == _L_('.')) { |
| float dec = 1; |
| nch = _GETC_(file); |
| if (width>0) width--; |
| while (width!=0 && (nch!=_EOF_) && _ISDIGIT_(nch)) { |
| dec /= 10; |
| cur += dec * (nch - _L_('0')); |
| nch = _GETC_(file); |
| if (width>0) width--; |
| } |
| } |
| /* handle exponent */ |
| if (width!=0 && (nch == _L_('e') || nch == _L_('E'))) { |
| int exponent = 0, negexp = 0; |
| float expcnt; |
| nch = _GETC_(file); |
| if (width>0) width--; |
| /* possible sign on the exponent */ |
| if (width!=0 && (nch==_L_('+') || nch==_L_('-'))) { |
| negexp = (nch==_L_('-')); |
| nch = _GETC_(file); |
| if (width>0) width--; |
| } |
| /* exponent digits */ |
| while (width!=0 && (nch!=_EOF_) && _ISDIGIT_(nch)) { |
| exponent *= 10; |
| exponent += (nch - _L_('0')); |
| nch = _GETC_(file); |
| if (width>0) width--; |
| } |
| /* update 'cur' with this exponent. */ |
| expcnt = negexp ? .1 : 10; |
| while (exponent!=0) { |
| if (exponent&1) |
| cur*=expcnt; |
| exponent/=2; |
| expcnt=expcnt*expcnt; |
| } |
| } |
| st = 1; |
| if (!suppress) { |
| if (L_prefix) _SET_NUMBER_(long double); |
| else if (l_prefix) _SET_NUMBER_(double); |
| else _SET_NUMBER_(float); |
| } |
| } |
| break; |
| /* According to |
| * http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclib/html/_crt_scanf_type_field_characters.asp |
| * 's' reads a character string in a call to fscanf |
| * and 'S' a wide character string and vice versa in a |
| * call to fwscanf. The 'h', 'w' and 'l' prefixes override |
| * this behaviour. 'h' forces reading char * but 'l' and 'w' |
| * force reading WCHAR. */ |
| case _L_('s'): |
| if (w_prefix || l_prefix) goto widecharstring; |
| else if (h_prefix) goto charstring; |
| #ifdef WIDE_SCANF |
| else goto widecharstring; |
| #else /* WIDE_SCANF */ |
| else goto charstring; |
| #endif /* WIDE_SCANF */ |
| case _L_('S'): |
| if (w_prefix || l_prefix) goto widecharstring; |
| else if (h_prefix) goto charstring; |
| #ifdef WIDE_SCANF |
| else goto charstring; |
| #else /* WIDE_SCANF */ |
| else goto widecharstring; |
| #endif /* WIDE_SCANF */ |
| charstring: { /* read a word into a char */ |
| char*str = suppress ? NULL : va_arg(ap, char*); |
| char*sptr = str; |
| /* skip initial whitespace */ |
| while ((nch!=_EOF_) && _ISSPACE_(nch)) |
| nch = _GETC_(file); |
| /* read until whitespace */ |
| while (width!=0 && (nch!=_EOF_) && !_ISSPACE_(nch)) { |
| #ifdef WIDE_SCANF |
| if (!suppress) *sptr++ = _CONVERT_(nch); |
| #else /* WIDE_SCANF */ |
| if (!suppress) *sptr++ = nch; |
| #endif /* WIDE_SCANF */ |
| st++; |
| nch = _GETC_(file); |
| if (width>0) width--; |
| } |
| /* terminate */ |
| if (!suppress) *sptr = 0; |
| } |
| break; |
| widecharstring: { /* read a word into a WCHAR * */ |
| WCHAR*str = |
| suppress ? NULL : va_arg(ap, WCHAR*); |
| WCHAR*sptr = str; |
| /* skip initial whitespace */ |
| while ((nch!=_EOF_) && _ISSPACE_(nch)) |
| nch = _GETC_(file); |
| /* read until whitespace */ |
| while (width!=0 && (nch!=_EOF_) && !_ISSPACE_(nch)) { |
| #ifdef WIDE_SCANF |
| if (!suppress) *sptr++ = nch; |
| #else /* WIDE_SCANF */ |
| if (!suppress) *sptr++ = _CONVERT_(nch); |
| #endif /* WIDE_SCANF */ |
| st++; |
| nch = _GETC_(file); |
| if (width>0) width--; |
| } |
| /* terminate */ |
| if (!suppress) *sptr = 0; |
| } |
| break; |
| /* 'c' and 'C work analogously to 's' and 'S' as described |
| * above */ |
| case _L_('c'): |
| if (w_prefix || l_prefix) goto widecharacter; |
| else if (h_prefix) goto character; |
| #ifdef WIDE_SCANF |
| else goto widecharacter; |
| #else /* WIDE_SCANF */ |
| else goto character; |
| #endif /* WIDE_SCANF */ |
| case _L_('C'): |
| if (w_prefix || l_prefix) goto widecharacter; |
| else if (h_prefix) goto character; |
| #ifdef WIDE_SCANF |
| else goto character; |
| #else /* WIDE_SCANF */ |
| else goto widecharacter; |
| #endif /* WIDE_SCANF */ |
| character: { /* read single character into char */ |
| if (!suppress) { |
| char*c = va_arg(ap, char*); |
| #ifdef WIDE_SCANF |
| *c = _CONVERT_(nch); |
| #else /* WIDE_SCANF */ |
| *c = nch; |
| #endif /* WIDE_SCANF */ |
| st = 1; |
| } |
| nch = _GETC_(file); |
| } |
| break; |
| widecharacter: { |
| if (!suppress) { /* read single character into WCHAR */ |
| WCHAR*c = va_arg(ap, WCHAR*); |
| #ifdef WIDE_SCANF |
| *c = nch; |
| #else /* WIDE_SCANF */ |
| *c = _CONVERT_(nch); |
| #endif /* WIDE_SCANF */ |
| st = 1; |
| } |
| nch = _GETC_(file); |
| } |
| break; |
| case _L_('n'): { |
| if (!suppress) { |
| int*n = va_arg(ap, int*); |
| *n = rd; |
| } |
| } |
| break; |
| default: FIXME("unhandled: %%%c\n", *format); |
| /* From spec: "if a percent sign is followed by a character |
| * that has no meaning as a format-control character, that |
| * character and the following characters are treated as |
| * an ordinary sequence of characters, that is, a sequence |
| * of characters that must match the input. For example, |
| * to specify that a percent-sign character is to be input, |
| * use %%." |
| * LEAVING AS-IS because we catch bugs better that way. */ |
| } |
| if (st && !suppress) rd++; |
| else if (!st) break; |
| } |
| /* a non-white-space character causes scanf to read, but not store, |
| * a matching non-white-space character. */ |
| else { |
| /* check for character match */ |
| if (nch == *format) { |
| nch = _GETC_(file); |
| } else break; |
| } |
| format++; |
| } |
| if (nch!=_EOF_) { |
| _UNGETC_(nch, file); |
| } |
| va_end(ap); |
| TRACE("returning %d\n", rd); |
| return rd; |
| } |
| |
| #undef _L_ |
| #undef _CHAR_ |
| #undef _EOF_ |
| #undef _ISSPACE_ |
| #undef _ISDIGIT_ |
| #undef _CONVERT_ |
| #undef _CHAR2DIGIT_ |
| #undef _GETC_ |
| #undef _UNGETC_ |
| #undef _FUNCTION_ |
