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| Current File : //usr/src/contrib/ncurses/ncurses/base/vsscanf.c |
/****************************************************************************
* Copyright (c) 1998-2003,2004 Free Software Foundation, Inc. *
* *
* Permission is hereby granted, free of charge, to any person obtaining a *
* copy of this software and associated documentation files (the *
* "Software"), to deal in the Software without restriction, including *
* without limitation the rights to use, copy, modify, merge, publish, *
* distribute, distribute with modifications, sublicense, and/or sell *
* copies of the Software, and to permit persons to whom the Software is *
* furnished to do so, subject to the following conditions: *
* *
* The above copyright notice and this permission notice shall be included *
* in all copies or substantial portions of the Software. *
* *
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
* IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
* THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
* *
* Except as contained in this notice, the name(s) of the above copyright *
* holders shall not be used in advertising or otherwise to promote the *
* sale, use or other dealings in this Software without prior written *
* authorization. *
****************************************************************************/
/****************************************************************************
* State-machine fallback written by Thomas E. Dickey 2002 *
****************************************************************************/
/*
* This function is needed to support vwscanw
*/
#include <curses.priv.h>
#if !HAVE_VSSCANF
MODULE_ID("$Id: vsscanf.c,v 1.18 2004/04/03 20:27:02 tom Exp $")
#if !(HAVE_VFSCANF || HAVE__DOSCAN)
#include <ctype.h>
#define L_SQUARE '['
#define R_SQUARE ']'
typedef enum {
cUnknown
,cError /* anything that isn't ANSI */
,cAssigned
,cChar
,cInt
,cFloat
,cDouble
,cPointer
,cLong
,cShort
,cRange
,cString
} ChunkType;
typedef enum {
oUnknown
,oShort
,oLong
} OtherType;
typedef enum {
sUnknown
,sPercent /* last was '%' beginning a format */
,sNormal /* ...somewhere in the middle */
,sLeft /* last was left square bracket beginning a range */
,sRange /* ...somewhere in the middle */
,sFinal /* last finished a format */
} ScanState;
static ChunkType
final_ch(int ch, OtherType other)
{
ChunkType result = cUnknown;
switch (ch) {
case 'c':
if (other == oUnknown)
result = cChar;
else
result = cError;
break;
case 'd':
case 'i':
case 'X':
case 'x':
switch (other) {
case oUnknown:
result = cInt;
break;
case oShort:
result = cShort;
break;
case oLong:
result = cLong;
break;
}
break;
case 'E':
case 'e':
case 'f':
case 'g':
switch (other) {
case oUnknown:
result = cFloat;
break;
case oShort:
result = cError;
break;
case oLong:
result = cDouble;
break;
}
break;
case 'n':
if (other == oUnknown)
result = cAssigned;
else
result = cError;
break;
case 'p':
if (other == oUnknown)
result = cPointer;
else
result = cError;
break;
case 's':
if (other == oUnknown)
result = cString;
else
result = cError;
break;
}
return result;
}
static OtherType
other_ch(int ch)
{
OtherType result = oUnknown;
switch (ch) {
case 'h':
result = oShort;
break;
case 'l':
result = oLong;
break;
}
return result;
}
#endif
/*VARARGS2*/
NCURSES_EXPORT(int)
vsscanf(const char *str, const char *format, va_list ap)
{
#if HAVE_VFSCANF || HAVE__DOSCAN
/*
* This code should work on anything descended from AT&T SVr1.
*/
FILE strbuf;
strbuf._flag = _IOREAD;
strbuf._ptr = strbuf._base = (unsigned char *) str;
strbuf._cnt = strlen(str);
strbuf._file = _NFILE;
#if HAVE_VFSCANF
return (vfscanf(&strbuf, format, ap));
#else
return (_doscan(&strbuf, format, ap));
#endif
#else
static int can_convert = -1;
int assigned = 0;
int consumed = 0;
T((T_CALLED("vsscanf(%s,%s,...)"),
_nc_visbuf2(1, str),
_nc_visbuf2(2, format)));
/*
* This relies on having a working "%n" format conversion. Check if it
* works. Only very old C libraries do not support it.
*
* FIXME: move this check into the configure script.
*/
if (can_convert < 0) {
int check1;
int check2;
if (sscanf("123", "%d%n", &check1, &check2) > 0
&& check1 == 123
&& check2 == 3) {
can_convert = 1;
} else {
can_convert = 0;
}
}
if (can_convert) {
size_t len_fmt = strlen(format) + 32;
char *my_fmt = malloc(len_fmt);
ChunkType chunk, ctest;
OtherType other, otest;
ScanState state;
unsigned n;
int eaten;
void *pointer;
if (my_fmt != 0) {
/*
* Split the original format into chunks, adding a "%n" to the end
* of each (except of course if it used %n), and use that
* information to decide where to start scanning the next chunk.
*
* FIXME: does %n count bytes or characters? If the latter, this
* will require further work for multibyte strings.
*/
while (*format != '\0') {
/* find a chunk */
state = sUnknown;
chunk = cUnknown;
other = oUnknown;
pointer = 0;
for (n = 0; format[n] != 0 && state != sFinal; ++n) {
my_fmt[n] = format[n];
switch (state) {
case sUnknown:
if (format[n] == '%')
state = sPercent;
break;
case sPercent:
if (format[n] == '%') {
state = sUnknown;
} else if (format[n] == L_SQUARE) {
state = sLeft;
} else {
state = sNormal;
--n;
}
break;
case sLeft:
state = sRange;
if (format[n] == '^') {
++n;
my_fmt[n] = format[n];
}
break;
case sRange:
if (format[n] == R_SQUARE) {
state = sFinal;
chunk = cRange;
}
break;
case sNormal:
if (format[n] == '*') {
state = sUnknown;
} else {
if ((ctest = final_ch(format[n], other)) != cUnknown) {
state = sFinal;
chunk = ctest;
} else if ((otest = other_ch(format[n])) != oUnknown) {
other = otest;
} else if (isalpha(UChar(format[n]))) {
state = sFinal;
chunk = cError;
}
}
break;
case sFinal:
break;
}
}
my_fmt[n] = '\0';
format += n;
if (chunk == cUnknown
|| chunk == cError) {
if (assigned == 0)
assigned = EOF;
break;
}
/* add %n, if the format was not that */
if (chunk != cAssigned) {
strcat(my_fmt, "%n");
}
switch (chunk) {
case cAssigned:
strcat(my_fmt, "%n");
pointer = &eaten;
break;
case cInt:
pointer = va_arg(ap, int *);
break;
case cShort:
pointer = va_arg(ap, short *);
break;
case cFloat:
pointer = va_arg(ap, float *);
break;
case cDouble:
pointer = va_arg(ap, double *);
break;
case cLong:
pointer = va_arg(ap, long *);
break;
case cPointer:
pointer = va_arg(ap, void *);
break;
case cChar:
case cRange:
case cString:
pointer = va_arg(ap, char *);
break;
case cError:
case cUnknown:
break;
}
/* do the conversion */
T(("...converting chunk #%d type %d(%s,%s)",
assigned + 1, chunk,
_nc_visbuf2(1, str + consumed),
_nc_visbuf2(2, my_fmt)));
if (sscanf(str + consumed, my_fmt, pointer, &eaten) > 0)
consumed += eaten;
else
break;
++assigned;
}
free(my_fmt);
}
}
returnCode(assigned);
#endif
}
#else
extern
NCURSES_EXPORT(void)
_nc_vsscanf(void); /* quiet's gcc warning */
NCURSES_EXPORT(void)
_nc_vsscanf(void)
{
} /* nonempty for strict ANSI compilers */
#endif /* !HAVE_VSSCANF */