scanf.h 17.8 KB
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/*
 * general implementation of scanf used by scanf, sscanf, fscanf,
 * _cscanf, wscanf, swscanf and fwscanf
 *
 * Copyright 1996,1998 Marcus Meissner
 * Copyright 1996 Jukka Iivonen
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 * Copyright 1997,2000, 2003 Uwe Bonnes
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 * 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
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 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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 */

#ifdef WIDE_SCANF
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#define _CHAR_ MSVCRT_wchar_t
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#define _EOF_ MSVCRT_WEOF
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#define _EOF_RET MSVCRT_WEOF
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#define _ISSPACE_(c) MSVCRT_iswspace(c)
#define _ISDIGIT_(c) MSVCRT_iswdigit(c)
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#define _WIDE2SUPPORTED_(c) c /* No conversion needed (wide to wide) */
#define _CHAR2SUPPORTED_(c) c /* FIXME: convert char to wide char */
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#define _CHAR2DIGIT_(c, base) wchar2digit((c), (base))
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#define _BITMAPSIZE_ 256*256
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#else /* WIDE_SCANF */
#define _CHAR_ char
#define _EOF_ MSVCRT_EOF
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#define _EOF_RET MSVCRT_EOF
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#define _ISSPACE_(c) isspace(c)
#define _ISDIGIT_(c) isdigit(c)
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#define _WIDE2SUPPORTED_(c) c /* FIXME: convert wide char to char */
#define _CHAR2SUPPORTED_(c) c /* No conversion needed (char to char) */
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#define _CHAR2DIGIT_(c, base) char2digit((c), (base))
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#define _BITMAPSIZE_ 256
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#endif /* WIDE_SCANF */

#ifdef CONSOLE
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#define _GETC_(file) (consumed++, _getch())
#define _UNGETC_(nch, file) do { _ungetch(nch); consumed--; } while(0)
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#define _FUNCTION_ static int MSVCRT_vcscanf(const char *format, __ms_va_list ap)
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#else
#ifdef STRING
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#undef _EOF_
#define _EOF_ 0
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#define _GETC_(file) (consumed++, *file++)
#define _UNGETC_(nch, file) do { file--; consumed--; } while(0)
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#ifdef WIDE_SCANF
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#define _FUNCTION_ static int MSVCRT_vswscanf(const MSVCRT_wchar_t *file, const MSVCRT_wchar_t *format, __ms_va_list ap)
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#else /* WIDE_SCANF */
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#define _FUNCTION_ static int MSVCRT_vsscanf(const char *file, const char *format, __ms_va_list ap)
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#endif /* WIDE_SCANF */
#else /* STRING */
#ifdef WIDE_SCANF
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#define _GETC_(file) (consumed++, MSVCRT_fgetwc(file))
#define _UNGETC_(nch, file) do { MSVCRT_ungetwc(nch, file); consumed--; } while(0)
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#define _FUNCTION_ static int MSVCRT_vfwscanf(MSVCRT_FILE* file, const MSVCRT_wchar_t *format, __ms_va_list ap)
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#else /* WIDE_SCANF */
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#define _GETC_(file) (consumed++, MSVCRT_fgetc(file))
#define _UNGETC_(nch, file) do { MSVCRT_ungetc(nch, file); consumed--; } while(0)
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#define _FUNCTION_ static int MSVCRT_vfscanf(MSVCRT_FILE* file, const char *format, __ms_va_list ap)
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#endif /* WIDE_SCANF */
#endif /* STRING */
#endif /* CONSOLE */

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_FUNCTION_ {
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    int rd = 0, consumed = 0;
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    int nch;
    if (!*format) return 0;
#ifndef WIDE_SCANF
#ifdef CONSOLE
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    TRACE("(%s):\n", debugstr_a(format));
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#else /* CONSOLE */
#ifdef STRING
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    TRACE("%s (%s)\n", file, debugstr_a(format));
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#else /* STRING */
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    TRACE("%p (%s)\n", file, debugstr_a(format));
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#endif /* STRING */
#endif /* CONSOLE */
#endif /* WIDE_SCANF */
    nch = _GETC_(file);
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    if (nch == _EOF_) return _EOF_RET;

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    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 */
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        else if (*format == '%') {
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            int st = 0; int suppress = 0; int width = 0;
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	    int base;
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	    int h_prefix = 0;
	    int l_prefix = 0;
	    int L_prefix = 0;
	    int w_prefix = 0;
	    int prefix_finished = 0;
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	    int I64_prefix = 0;
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            format++;
	    /* look for leading asterisk, which means 'suppress assignment of
	     * this field'. */
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	    if (*format=='*') {
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		format++;
		suppress=1;
	    }
	    /* look for width specification */
	    while (_ISDIGIT_(*format)) {
		width*=10;
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		width+=*format++ - '0';
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	    }
	    if (width==0) width=-1; /* no width spec seen */
	    /* read prefix (if any) */
	    while (!prefix_finished) {
		switch(*format) {
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		case 'h': h_prefix = 1; break;
		case 'l': l_prefix = 1; break;
		case 'w': w_prefix = 1; break;
		case 'L': L_prefix = 1; break;
		case 'I':
		    if (*(format + 1) == '6' &&
			*(format + 2) == '4') {
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			I64_prefix = 1;
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			format += 2;
		    }
		    break;
		default:
		    prefix_finished = 1;
		}
		if (!prefix_finished) format++;
	    }
	    /* read type */
            switch(*format) {
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	    case 'p':
	    case 'P': /* pointer. */
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                if (sizeof(void *) == sizeof(LONGLONG)) I64_prefix = 1;
                /* fall through */
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	    case 'x':
	    case 'X': /* hexadecimal integer. */
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		base = 16;
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		goto number;
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	    case 'o': /* octal integer */
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		base = 8;
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		goto number;
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	    case 'u': /* unsigned decimal integer */
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		base = 10;
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		goto number;
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	    case 'd': /* signed decimal integer */
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		base = 10;
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		goto number;
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	    case 'i': /* generic integer */
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		base = 0;
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	    number: {
		    /* read an integer */
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		    ULONGLONG cur = 0;
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		    int negative = 0;
		    int seendigit=0;
                    /* skip initial whitespace */
                    while ((nch!=_EOF_) && _ISSPACE_(nch))
                        nch = _GETC_(file);
                    /* get sign */
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                    if (nch == '-' || nch == '+') {
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			negative = (nch=='-');
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                        nch = _GETC_(file);
			if (width>0) width--;
                    }
		    /* look for leading indication of base */
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		    if (width!=0 && nch == '0' && *format != 'p' && *format != 'P') {
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                        nch = _GETC_(file);
			if (width>0) width--;
			seendigit=1;
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			if (width!=0 && (nch=='x' || nch=='X')) {
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			    if (base==0)
				base=16;
			    if (base==16) {
				nch = _GETC_(file);
				if (width>0) width--;
				seendigit=0;
			    }
			} else if (base==0)
			    base = 8;
		    }
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		    /* format %i without indication of base */
		    if (base==0)
			base = 10;
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		    /* throw away leading zeros */
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		    while (width!=0 && nch=='0') {
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                        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 */
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                    while (width!=0 && (nch!=_EOF_) && _CHAR2DIGIT_(nch, base)!=-1) {
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                        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
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			if (I64_prefix) _SET_NUMBER_(LONGLONG);
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			else if (l_prefix) _SET_NUMBER_(LONG);
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			else if (h_prefix) _SET_NUMBER_(short int);
			else _SET_NUMBER_(int);
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		    }
                }
                break;
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	    case 'e':
	    case 'E':
	    case 'f':
	    case 'g':
            case 'G': { /* read a float */
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                    long double cur = 0;
		    int negative = 0;
                    /* skip initial whitespace */
                    while ((nch!=_EOF_) && _ISSPACE_(nch))
                        nch = _GETC_(file);
		    /* get sign. */
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                    if (nch == '-' || nch == '+') {
			negative = (nch=='-');
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			if (width>0) width--;
			if (width==0) break;
                        nch = _GETC_(file);
                    }
		    /* get first digit. */
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		    if ('.' != nch) {
		      if (!_ISDIGIT_(nch)) break;
		      cur = (nch - '0');
		      nch = _GETC_(file);
		      if (width>0) width--;
		      /* read until no more digits */
		      while (width!=0 && (nch!=_EOF_) && _ISDIGIT_(nch)) {
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                        cur = cur*10 + (nch - '0');
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                        nch = _GETC_(file);
			if (width>0) width--;
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		      }
		    } else {
		      cur = 0; /* MaxPayneDemo Fix: .8 -> 0.8 */
		    }
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		    /* handle decimals */
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                    if (width!=0 && nch == '.') {
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                        long double dec = 1;
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                        nch = _GETC_(file);
			if (width>0) width--;
                        while (width!=0 && (nch!=_EOF_) && _ISDIGIT_(nch)) {
                            dec /= 10;
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                            cur += dec * (nch - '0');
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                            nch = _GETC_(file);
			    if (width>0) width--;
                        }
                    }
		    /* handle exponent */
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		    if (width!=0 && (nch == 'e' || nch == 'E')) {
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			int exponent = 0, negexp = 0;
			float expcnt;
                        nch = _GETC_(file);
			if (width>0) width--;
			/* possible sign on the exponent */
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			if (width!=0 && (nch=='+' || nch=='-')) {
			    negexp = (nch=='-');
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                            nch = _GETC_(file);
			    if (width>0) width--;
			}
			/* exponent digits */
			while (width!=0 && (nch!=_EOF_) && _ISDIGIT_(nch)) {
			    exponent *= 10;
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			    exponent += (nch - '0');
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                            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;
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		/* According to msdn,
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		 * '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. */
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	    case 's':
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		    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 */
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	    case 'S':
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		    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 */
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		    char *sptr = suppress ? NULL : va_arg(ap, char*);
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                    /* skip initial whitespace */
                    while ((nch!=_EOF_) && _ISSPACE_(nch))
                        nch = _GETC_(file);
                    /* read until whitespace */
                    while (width!=0 && (nch!=_EOF_) && !_ISSPACE_(nch)) {
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                        if (!suppress) *sptr++ = _CHAR2SUPPORTED_(nch);
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			st++;
                        nch = _GETC_(file);
			if (width>0) width--;
                    }
                    /* terminate */
                    if (!suppress) *sptr = 0;
                }
                break;
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	    widecharstring: { /* read a word into a wchar_t* */
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		    MSVCRT_wchar_t *sptr = suppress ? NULL : va_arg(ap, MSVCRT_wchar_t*);
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                    /* skip initial whitespace */
                    while ((nch!=_EOF_) && _ISSPACE_(nch))
                        nch = _GETC_(file);
                    /* read until whitespace */
                    while (width!=0 && (nch!=_EOF_) && !_ISSPACE_(nch)) {
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                        if (!suppress) *sptr++ = _WIDE2SUPPORTED_(nch);
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			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 */
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	    case 'c':
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		    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 */
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	    case 'C':
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		    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 */
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                    char *str = suppress ? NULL : va_arg(ap, char*);
                    if (width == -1) width = 1;
                    while ((width != 0) && (nch != _EOF_))
                    {
                        if (!suppress) *str++ = _CHAR2SUPPORTED_(nch);
                        st++;
                        width--;
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                        nch = _GETC_(file);
                    }
                }
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		break;
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	  widecharacter: { /* read single character into a wchar_t */
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                    MSVCRT_wchar_t *str = suppress ? NULL : va_arg(ap, MSVCRT_wchar_t*);
                    if (width == -1) width = 1;
                    while ((width != 0) && (nch != _EOF_))
                    {
                        if (!suppress) *str++ = _WIDE2SUPPORTED_(nch);
                        st++;
                        width--;
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                        nch = _GETC_(file);
                    }
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	        }
		break;
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	    case 'n': {
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 		    if (!suppress) {
			int*n = va_arg(ap, int*);
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			*n = consumed - 1;
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		    }
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		    /* This is an odd one: according to the standard,
		     * "Execution of a %n directive does not increment the
		     * assignment count returned at the completion of
		     * execution" even if it wasn't suppressed with the
		     * '*' flag.  The Corrigendum to the standard seems
		     * to contradict this (comment out the assignment to
		     * suppress below if you want to implement these
		     * alternate semantics) but the windows program I'm
		     * looking at expects the behavior I've coded here
		     * (which happens to be what glibc does as well).
		     */
		    suppress = 1;
		    st = 1;
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	        }
		break;
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	    case '[': {
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                    _CHAR_ *str = suppress ? NULL : va_arg(ap, _CHAR_*);
                    _CHAR_ *sptr = str;
		    RTL_BITMAP bitMask;
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                    ULONG *Mask;
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		    int invert = 0; /* Set if we are NOT to find the chars */

		    /* Init our bitmap */
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		    Mask = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, _BITMAPSIZE_/8);
		    RtlInitializeBitMap(&bitMask, Mask, _BITMAPSIZE_);
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		    /* Read the format */
		    format++;
		    if(*format == '^') {
			invert = 1;
			format++;
		    }
		    if(*format == ']') {
			RtlSetBits(&bitMask, ']', 1);
			format++;
		    }
                    while(*format && (*format != ']')) {
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			/* According to msdn:
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			 * "Note that %[a-z] and %[z-a] are interpreted as equivalent to %[abcde...z]." */
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			if((*format == '-') && (*(format + 1) != ']')) {
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			    if ((*(format - 1)) < *(format + 1))
				RtlSetBits(&bitMask, *(format - 1) +1 , *(format + 1) - *(format - 1));
			    else
				RtlSetBits(&bitMask, *(format + 1)    , *(format - 1) - *(format + 1));			      
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			    format++;
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			} else
			    RtlSetBits(&bitMask, *format, 1);
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			format++;
		    }
                    /* read until char is not suitable */
                    while ((width != 0) && (nch != _EOF_)) {
			if(!invert) {
			    if(RtlAreBitsSet(&bitMask, nch, 1)) {
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				if (!suppress) *sptr++ = _CHAR2SUPPORTED_(nch);
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			    } else
				break;
			} else {
			    if(RtlAreBitsClear(&bitMask, nch, 1)) {
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				if (!suppress) *sptr++ = _CHAR2SUPPORTED_(nch);
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			    } else
				break;
			}
                        st++;
                        nch = _GETC_(file);
                        if (width>0) width--;
                    }
                    /* terminate */
                    if (!suppress) *sptr = 0;
		    HeapFree(GetProcessHeap(), 0, Mask);
                }
                break;
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            default:
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		/* 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,
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		 * use %%." */
                while ((nch!=_EOF_) && _ISSPACE_(nch))
                    nch = _GETC_(file);
                if (nch==*format) {
                    suppress = 1; /* whoops no field to be read */
                    st = 1; /* but we got what we expected */
                    nch = _GETC_(file);
                }
                break;
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            }
            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);
    }
    TRACE("returning %d\n", rd);
    return rd;
}

#undef _CHAR_
#undef _EOF_
Alexandre Julliard's avatar
Alexandre Julliard committed
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#undef _EOF_RET
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#undef _ISSPACE_
#undef _ISDIGIT_
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#undef _CHAR2SUPPORTED_
#undef _WIDE2SUPPORTED_
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#undef _CHAR2DIGIT_
#undef _GETC_
#undef _UNGETC_
#undef _FUNCTION_
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#undef _BITMAPSIZE_