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