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wine/dlls/msvcrt/scanf.h

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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
* 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_
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