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MiniGUI/src/libc/vfscanf.c
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///////////////////////////////////////////////////////////////////////////////
//
// IMPORTANT NOTICE
//
// The following open source license statement does not apply to any
// entity in the Exception List published by FMSoft.
//
// For more information, please visit:
//
// https://www.fmsoft.cn/exception-list
//
//////////////////////////////////////////////////////////////////////////////
/*
* This file is part of MiniGUI, a mature cross-platform windowing
* and Graphics User Interface (GUI) support system for embedded systems
* and smart IoT devices.
*
* Copyright (C) 2002~2018, Beijing FMSoft Technologies Co., Ltd.
* Copyright (C) 1998~2002, WEI Yongming
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Or,
*
* As this program is a library, any link to this program must follow
* GNU General Public License version 3 (GPLv3). If you cannot accept
* GPLv3, you need to be licensed from FMSoft.
*
* If you have got a commercial license of this program, please use it
* under the terms and conditions of the commercial license.
*
* For more information about the commercial license, please refer to
* <http://www.minigui.com/blog/minigui-licensing-policy/>.
*/
/*
** vfscanf.c: implementation of own_vfscanf function.
**
** Current maintainer: Wei Yongming
**
** Create date: 2004-02-02 by Wei yongming
*/
/*
** This code is based on original code with the following copyright:
*/
/*
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#include <stdlib.h>
#include <stdarg.h>
#include <ctype.h>
#include "common.h"
#if defined (_MGUSE_OWN_STDIO) && defined(_MGUSE_OWN_VFSCANF)
#include "endianrw.h"
#ifdef _SCANF_FLOATING_POINT
#include <float.h>
#define MAXFRACT DBL_DIG
#define MAXEXP DBL_MAX_10_EXP
#define BUF (MAXEXP+MAXFRACT+3) /* 3 = sign + decimal point + NUL */
#else
#define BUF 40
#endif /* _SCANF_FLOATING_POINT */
/*
* Flags used during conversion.
*/
#define LONG 0x01 /* l: long or double */
#define LONGDBL 0x02 /* L: long double; unimplemented */
#define SHORT 0x04 /* h: short */
#define SUPPRESS 0x08 /* suppress assignment */
#define POINTER 0x10 /* weird %p pointer (`fake hex') */
#define NOSKIP 0x20 /* do not skip blanks */
/*
* The following are used in numeric conversions only:
* SIGNOK, NDIGITS, DPTOK, and EXPOK are for floating point;
* SIGNOK, NDIGITS, PFXOK, and NZDIGITS are for integral.
*/
#define SIGNOK 0x40 /* +/- is (still) legal */
#define NDIGITS 0x80 /* no digits detected */
#define DPTOK 0x100 /* (float) decimal point is still legal */
#define EXPOK 0x200 /* (float) exponent (e+3, etc) still
legal */
#define PFXOK 0x100 /* 0x prefix is (still) legal */
#define NZDIGITS 0x200 /* no zero digits detected */
/*
* Conversion types.
*/
#define CT_CHAR 0 /* %c conversion */
#define CT_CCL 1 /* %[...] conversion */
#define CT_STRING 2 /* %s conversion */
#define CT_INT 3 /* integer, i.e., strtol or strtoul */
#define CT_FLOAT 4 /* floating, i.e., strtod */
#if 0
#define u_char unsigned char
#endif
#define u_char char
#define u_long unsigned long
typedef unsigned long (*strtoul_t)(const char *, char **endptr, int base);
static u_char *
__sccl (char *tab, u_char *fmt);
/*
* vfscanf
*/
inline static int peek_byte (MG_RWops* file, u_char* curr_byte)
{
if (file->read ( file, curr_byte, 1, 1 ) != 1) {
return EOF;
}
file->ungetc ( file, *curr_byte );
return 1;
}
#define UNGETC(c, file) (file->ungetc ( file, c))
#define CURR_POS (peek_byte ( file, (u_char *)&curr_byte), &curr_byte)
#define INC_CURR_POS ( file->read ( file, &curr_byte, 1, 1 ) )
#define MOVE_CURR_POS(x) (file->seek ( file, (x), SEEK_CUR ))
#define SPACE_LEFT (2)
#define BufferEmpty (file->eof (file))
#ifdef _I18N_MB_REQUIRED
typedef int (*mbtowc_fn_type)(wchar_t *, const char *, size_t, int *);
mbtowc_fn_type __get_current_locale_mbtowc_fn();
#endif
int own_vfscanf (FILE *fp, const char *fmt0, va_list ap)
{
u_char *fmt = (u_char *) fmt0;
int c; /* character from format, or conversion */
wchar_t wc; /* wide character from format */
size_t width; /* field width, or 0 */
char *p; /* points into all kinds of strings */
int n; /* handy integer */
int flags; /* flags as defined above */
char *p0; /* saves original value of p when necessary */
char *lptr; /* literal pointer */
int nassigned; /* number of fields assigned */
int nread; /* number of characters consumed from fp */
int base = 0; /* base argument to strtol/strtoul */
int nbytes = 1; /* number of bytes processed */
#ifdef _I18N_MB_REQUIRED
mbtowc_fn_type mbtowc_fn;
int state = 0; /* used for mbtowc_fn */
#endif
strtoul_t ccfn = NULL; /* conversion function (strtol/strtoul) */
char ccltab[256]; /* character class table for %[...] */
char buf[BUF]; /* buffer for numeric conversions */
MG_RWops *file = (MG_RWops *)fp;
Uint8 curr_byte;
short *sp;
int *ip;
float *flp;
long double *ldp;
double *dp;
long *lp;
/* `basefix' is used to avoid `if' tests in the integer scanner */
static const short basefix[17] =
{10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16};
#ifdef _I18N_MB_REQUIRED
mbtowc_fn = __get_current_locale_mbtowc_fn();
#endif
nassigned = 0;
nread = 0;
for (;;)
{
#ifndef _I18N_MB_REQUIRED
wc = *fmt;
#else
nbytes = mbtowc_fn (&wc, fmt, MB_CUR_MAX, &state);
#endif
fmt += nbytes;
if (wc == 0)
return nassigned;
if (nbytes == 1 && isspace (wc))
{
for (;;)
{
if (BufferEmpty)
return nassigned;
if (!isspace ((int)(*CURR_POS)))
break;
nread++, INC_CURR_POS;
}
continue;
}
if (wc != '%')
goto literal;
width = 0;
flags = 0;
/*
* switch on the format. continue if done; break once format
* type is derived.
*/
again:
c = *fmt++;
switch (c)
{
case '%':
literal:
lptr = fmt - nbytes;
for (n = 0; n < nbytes; ++n)
{
if (BufferEmpty)
goto input_failure;
if (*CURR_POS != *lptr)
goto match_failure;
INC_CURR_POS;
nread++;
++lptr;
}
continue;
case '*':
flags |= SUPPRESS;
goto again;
case 'l':
flags |= LONG;
goto again;
case 'L':
flags |= LONGDBL;
goto again;
case 'h':
flags |= SHORT;
goto again;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
width = width * 10 + c - '0';
goto again;
/*
* Conversions. Those marked `compat' are for
* 4.[123]BSD compatibility.
*
* (According to ANSI, E and X formats are supposed to
* the same as e and x. Sorry about that.)
*/
case 'D': /* compat */
flags |= LONG;
/* FALLTHROUGH */
case 'd':
c = CT_INT;
ccfn = (strtoul_t)strtol;
base = 10;
break;
case 'i':
c = CT_INT;
ccfn = (strtoul_t)strtol;
base = 0;
break;
case 'O': /* compat */
flags |= LONG;
/* FALLTHROUGH */
case 'o':
c = CT_INT;
ccfn = strtoul;
base = 8;
break;
case 'u':
c = CT_INT;
ccfn = strtoul;
base = 10;
break;
case 'X': /* compat XXX */
case 'x':
flags |= PFXOK; /* enable 0x prefixing */
c = CT_INT;
ccfn = strtoul;
base = 16;
break;
case 'E': /* compat XXX */
case 'G': /* compat XXX */
/* ANSI says that E,G and X behave the same way as e,g,x */
/* FALLTHROUGH */
case 'e':
case 'f':
case 'g':
c = CT_FLOAT;
break;
case 's':
c = CT_STRING;
break;
case '[':
fmt = __sccl (ccltab, fmt);
flags |= NOSKIP;
c = CT_CCL;
break;
case 'c':
flags |= NOSKIP;
c = CT_CHAR;
break;
case 'p': /* pointer format is like hex */
flags |= POINTER | PFXOK;
c = CT_INT;
ccfn = strtoul;
base = 16;
break;
case 'n':
if (flags & SUPPRESS) /* ??? */
continue;
if (flags & SHORT)
{
sp = va_arg (ap, short *);
*sp = nread;
}
else if (flags & LONG)
{
lp = va_arg (ap, long *);
*lp = nread;
}
else
{
ip = va_arg (ap, int *);
*ip = nread;
}
continue;
/*
* Disgusting backwards compatibility hacks. XXX
*/
case '\0': /* compat */
return EOF;
default: /* compat */
if (isupper (c))
flags |= LONG;
c = CT_INT;
ccfn = (strtoul_t)strtol;
base = 10;
break;
}
/*
* We have a conversion that requires input.
*/
if (BufferEmpty)
goto input_failure;
/*
* Consume leading white space, except for formats that
* suppress this.
*/
if ((flags & NOSKIP) == 0)
{
while (isspace (*CURR_POS))
{
nread++;
INC_CURR_POS;
if (SPACE_LEFT == 0)
goto input_failure;
}
/*
* Note that there is at least one character in the
* buffer, so conversions that do not set NOSKIP ca
* no longer result in an input failure.
*/
}
/*
* Do the conversion.
*/
switch (c)
{
case CT_CHAR:
/* scan arbitrary characters (sets NOSKIP) */
if (width == 0)
width = 1;
if (flags & SUPPRESS)
{
size_t sum = 0;
for (;;)
{
if ((n = SPACE_LEFT) < (signed)width)
{
sum += n;
width -= n;
MOVE_CURR_POS(n-1);
INC_CURR_POS;
if (sum == 0)
goto input_failure;
break;
}
else
{
sum += width;
MOVE_CURR_POS(width - 1);
INC_CURR_POS;
break;
}
}
nread += sum;
}
else
{
/* Kludge city for the moment */
char *dest = va_arg (ap, char *);
int n = width;
if (SPACE_LEFT == 0)
goto input_failure;
while (n && !BufferEmpty)
{
*dest++ = *CURR_POS;
INC_CURR_POS;
n--;
nread++;
}
nassigned++;
}
break;
case CT_CCL:
/* scan a (nonempty) character class (sets NOSKIP) */
if (width == 0)
width = ~0; /* `infinity' */
/* take only those things in the class */
if (flags & SUPPRESS)
{
n = 0;
while (ccltab[*CURR_POS])
{
n++, INC_CURR_POS;
if (--width == 0)
break;
if (BufferEmpty)
{
if (n == 0)
goto input_failure;
break;
}
}
if (n == 0)
goto match_failure;
}
else
{
p0 = p = va_arg (ap, char *);
while (ccltab[*CURR_POS])
{
*p++ = *CURR_POS;
INC_CURR_POS;
if (--width == 0)
break;
if (BufferEmpty)
{
if (p == p0)
goto input_failure;
break;
}
}
n = p - p0;
if (n == 0)
goto match_failure;
*p = 0;
nassigned++;
}
nread += n;
break;
case CT_STRING:
/* like CCL, but zero-length string OK, & no NOSKIP */
if (width == 0)
width = ~0;
if (flags & SUPPRESS)
{
n = 0;
while (!isspace (*CURR_POS))
{
n++, INC_CURR_POS;
if (--width == 0)
break;
if (BufferEmpty)
break;
}
nread += n;
}
else
{
p0 = p = va_arg (ap, char *);
while (!isspace (*CURR_POS))
{
*p++ = *CURR_POS;
INC_CURR_POS;
if (--width == 0)
break;
if (BufferEmpty)
break;
}
*p = 0;
nread += p - p0;
nassigned++;
}
continue;
case CT_INT:
/* scan an integer as if by strtol/strtoul */
#ifdef hardway
if (width == 0 || width > sizeof (buf) - 1)
width = sizeof (buf) - 1;
#else
/* size_t is unsigned, hence this optimisation */
if (--width > sizeof (buf) - 2)
width = sizeof (buf) - 2;
width++;
#endif
flags |= SIGNOK | NDIGITS | NZDIGITS;
for (p = buf; width; width--)
{
c = *CURR_POS;
/*
* Switch on the character; `goto ok' if we
* accept it as a part of number.
*/
switch (c)
{
/*
* The digit 0 is always legal, but is special.
* For %i conversions, if no digits (zero or nonzero)
* have been scanned (only signs), we will have base==0
* In that case, we should set it to 8 and enable 0x
* prefixing. Also, if we have not scanned zero digits
* before this, do not turn off prefixing (someone else
* will turn it off if we have scanned any nonzero
* digits).
*/
case '0':
if (base == 0)
{
base = 8;
flags |= PFXOK;
}
if (flags & NZDIGITS)
flags &= ~(SIGNOK | NZDIGITS | NDIGITS);
else
flags &= ~(SIGNOK | PFXOK | NDIGITS);
goto ok;
/* 1 through 7 always legal */
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
base = basefix[base];
flags &= ~(SIGNOK | PFXOK | NDIGITS);
goto ok;
/* digits 8 and 9 ok iff decimal or hex */
case '8':
case '9':
base = basefix[base];
if (base <= 8)
break; /* not legal here */
flags &= ~(SIGNOK | PFXOK | NDIGITS);
goto ok;
/* letters ok iff hex */
case 'A':
case 'B':
case 'C':
case 'D':
case 'E':
case 'F':
case 'a':
case 'b':
case 'c':
case 'd':
case 'e':
case 'f':
/* no need to fix base here */
if (base <= 10)
break; /* not legal here */
flags &= ~(SIGNOK | PFXOK | NDIGITS);
goto ok;
/* sign ok only as first character */
case '+':
case '-':
if (flags & SIGNOK)
{
flags &= ~SIGNOK;
goto ok;
}
break;
/* x ok iff flag still set & 2nd char */
case 'x':
case 'X':
if (flags & PFXOK && p == buf + 1)
{
base = 16;/* if %i */
flags &= ~PFXOK;
goto ok;
}
break;
}
/*
* If we got here, c is not a legal character
* for a number. Stop accumulating digits.
*/
break;
ok:
/*
* c is legal: store it and look at the next.
*/
*p++ = c;
INC_CURR_POS;
if (SPACE_LEFT == 0)
break; /* EOF */
}
/*
* If we had only a sign, it is no good; push back the sign.
* If the number ends in `x', it was [sign] '0' 'x', so push
* back the x and treat it as [sign] '0'.
*/
if (flags & NDIGITS)
{
if (p > buf)
UNGETC (*(u_char *)-- p, file);
goto match_failure;
}
c = ((u_char *) p)[-1];
if (c == 'x' || c == 'X')
{
--p;
UNGETC (c, file);
}
if ((flags & SUPPRESS) == 0)
{
u_long res;
*p = 0;
res = (*ccfn) (buf, (char **) NULL, base);
if (flags & POINTER)
*(va_arg (ap, char **)) = (char *) res;
else if (flags & SHORT)
{
sp = va_arg (ap, short *);
*sp = res;
}
else if (flags & LONG)
{
lp = va_arg (ap, long *);
*lp = res;
}
else
{
ip = va_arg (ap, int *);
*ip = res;
}
nassigned++;
}
nread += p - buf;
break;
case CT_FLOAT:
/* scan a floating point number as if by strtod */
#ifdef hardway
if (width == 0 || width > sizeof (buf) - 1)
width = sizeof (buf) - 1;
#else
/* size_t is unsigned, hence this optimisation */
if (--width > sizeof (buf) - 2)
width = sizeof (buf) - 2;
width++;
#endif // ifdef hardway
flags |= SIGNOK | NDIGITS | DPTOK | EXPOK;
for (p = buf; width; width--)
{
c = *CURR_POS;
/*
* This code mimicks the integer conversion
* code, but is much simpler.
*/
switch (c)
{
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
flags &= ~(SIGNOK | NDIGITS);
goto fok;
case '+':
case '-':
if (flags & SIGNOK)
{
flags &= ~SIGNOK;
goto fok;
}
break;
case '.':
if (flags & DPTOK)
{
flags &= ~(SIGNOK | DPTOK);
goto fok;
}
break;
case 'e':
case 'E':
/* no exponent without some digits */
if ((flags & (NDIGITS | EXPOK)) == EXPOK)
{
flags =
(flags & ~(EXPOK | DPTOK)) |
SIGNOK | NDIGITS;
goto fok;
}
break;
}
break;
fok:
*p++ = c;
INC_CURR_POS;
if (SPACE_LEFT == 0)
break; /* EOF */
}
/*
* If no digits, might be missing exponent digits
* (just give back the exponent) or might be missing
* regular digits, but had sign and/or decimal point.
*/
if (flags & NDIGITS)
{
if (flags & EXPOK)
{
/* no digits at all */
while (p > buf)
UNGETC (*(u_char *)-- p, file);
goto match_failure;
}
/* just a bad exponent (e and maybe sign) */
c = *(u_char *)-- p;
if (c != 'e' && c != 'E')
{
UNGETC (c, file); /* sign */
c = *(u_char *)-- p;
}
UNGETC (c, file);
}
if ((flags & SUPPRESS) == 0)
{
double res;
*p = 0;
#ifdef _SCANF_FLOATING_POINT
res = atof (buf);
#else
res = 0.0;
#endif
if (flags & LONG)
{
dp = va_arg (ap, double *);
*dp = res;
}
else if (flags & LONGDBL)
{
ldp = va_arg (ap, long double *);
*ldp = res;
}
else
{
flp = va_arg (ap, float *);
*flp = res;
}
nassigned++;
}
nread += p - buf;
break;
}
}
input_failure:
return nassigned ? nassigned : -1;
match_failure:
return nassigned;
} // vfscanf()
/*
* Fill in the given table from the scanset at the given format
* (just after `['). Return a pointer to the character past the
* closing `]'. The table has a 1 wherever characters should be
* considered part of the scanset.
*/
/*static*/
u_char *
__sccl (char *tab, u_char *fmt)
{
int c, n, v;
/* first `clear' the whole table */
c = *fmt++; /* first char hat => negated scanset */
if (c == '^')
{
v = 1; /* default => accept */
c = *fmt++; /* get new first char */
}
else
v = 0; /* default => reject */
/* should probably use memset here */
for (n = 0; n < 256; n++)
tab[n] = v;
if (c == 0)
return fmt - 1; /* format ended before closing ] */
/*
* Now set the entries corresponding to the actual scanset to the
* opposite of the above.
*
* The first character may be ']' (or '-') without being special; the
* last character may be '-'.
*/
v = 1 - v;
for (;;)
{
tab[c] = v; /* take character c */
doswitch:
n = *fmt++; /* and examine the next */
switch (n)
{
case 0: /* format ended too soon */
return fmt - 1;
case '-':
/*
* A scanset of the form [01+-] is defined as `the digit 0, the
* digit 1, the character +, the character -', but the effect
* of a scanset such as [a-zA-Z0-9] is implementation defined.
* The V7 Unix scanf treats `a-z' as `the letters a through z',
* but treats `a-a' as `the letter a, the character -, and the
* letter a'.
*
* For compatibility, the `-' is not considerd to define a
* range if the character following it is either a close
* bracket (required by ANSI) or is not numerically greater
* than the character we just stored in the table (c).
*/
n = *fmt;
if (n == ']' || n < c)
{
c = '-';
break; /* resume the for(;;) */
}
fmt++;
do
{ /* fill in the range */
tab[++c] = v;
}
while (c < n);
#if 1 /* XXX another disgusting compatibility hack */
/*
* Alas, the V7 Unix scanf also treats formats such
* as [a-c-e] as `the letters a through e'. This too
* is permitted by the standard....
*/
goto doswitch;
#else
c = *fmt++;
if (c == 0)
return fmt - 1;
if (c == ']')
return fmt;
#endif
break;
case ']': /* end of scanset */
return fmt;
default: /* just another character */
c = n;
break;
}
}
/* NOTREACHED */
}
#endif /* _MGUSE_OWN_STDIO */
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