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|
/* $Id: nocrt-vsscanf.cpp $ */
/** @file
* IPRT - No-CRT - Simplistic vsscanf().
*/
/*
* Copyright (C) 2022-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* 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, in version 3 of the
* License.
*
* 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 <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#define IPRT_NO_CRT_FOR_3RD_PARTY
#include "internal/nocrt.h"
#include <iprt/nocrt/stdio.h>
#include <iprt/ctype.h>
#include <iprt/err.h>
#include <iprt/stdarg.h>
#include <iprt/string.h>
static const char *rtNoCrtScanString(const char *pszString, size_t cchWidth, char *pszDst, int *pcMatches)
{
if (pszDst)
*pcMatches += 1;
while (cchWidth-- > 0)
{
char ch = *pszString;
if (pszDst)
*pszDst++ = ch;
if (ch != '\0')
pszString++;
else
return pszString;
}
if (pszDst)
*pszDst = '\0';
return pszString;
}
static const char *rtNoCrtScanChars(const char *pszString, unsigned cchWidth, char *pchDst, int *pcMatches)
{
if (pchDst)
*pcMatches += 1;
while (cchWidth-- > 0)
{
char ch = *pszString;
if (pchDst)
*pchDst++ = ch;
if (ch != '\0')
pszString++;
else
{
/** @todo how do we handle a too short strings? memset the remainder and
* count it as a match? */
if (pchDst && cchWidth > 0)
RT_BZERO(pchDst, cchWidth);
return pszString;
}
}
return pszString;
}
static void rtNoCrtStorInt(void *pvDst, char chPrefix, uint64_t uValue)
{
switch (chPrefix)
{
default:
AssertFailed();
RT_FALL_THRU();
case '\0': *(unsigned int *)pvDst = (unsigned int)uValue; break;
case 'H': *(unsigned char *)pvDst = (unsigned char)uValue; break;
case 'h': *(unsigned short *)pvDst = (unsigned short)uValue; break;
case 'j': *(uint64_t *)pvDst = uValue; break;
case 'l': *(unsigned long *)pvDst = (unsigned long)uValue; break;
case 'L': *(unsigned long long *)pvDst = (unsigned long long)uValue; break;
case 't': *(ptrdiff_t *)pvDst = (ptrdiff_t)uValue; break;
case 'Z':
case 'z': *(size_t *)pvDst = (size_t)uValue; break;
}
}
static const char *rtNoCrtScanInt(const char *pszString, unsigned uBase, bool fSigned, char chPrefix, int cchWidth,
void *pvDst, int *pcMatches)
{
if (cchWidth >= 0 && cchWidth < _16M)
uBase |= (unsigned)cchWidth << 8;
int rc;
if (fSigned)
{
int64_t iVal = 0;
rc = RTStrToInt64Ex(pszString, (char **)&pszString, uBase, &iVal);
if (RT_SUCCESS(rc))
{
if (pvDst)
{
rtNoCrtStorInt(pvDst, chPrefix, (uint64_t)iVal);
*pcMatches += 1;
}
}
else
pszString = NULL;
}
else
{
uint64_t uVal = 0;
rc = RTStrToUInt64Ex(pszString, (char **)&pszString, uBase, &uVal);
if (RT_SUCCESS(rc))
{
if (pvDst)
{
rtNoCrtStorInt(pvDst, chPrefix, uVal);
*pcMatches += 1;
}
}
else
pszString = NULL;
}
return pszString;
}
static const char *rtNoCrtScanFloat(const char *pszString, char chPrefix, int cchWidth, void *pvDst, int *pcMatches)
{
size_t const cchMax = cchWidth > 0 ? (unsigned)cchWidth : 0;
int rc;
switch (chPrefix)
{
default:
case '\0':
#ifndef RT_OS_WINDOWS /* Windows doesn't do float, only double and "long" double (same as double). */
rc = RTStrToFloatEx(pszString, (char **)&pszString, cchMax, (float *)pvDst);
break;
#else
RT_FALL_THRU();
#endif
case 'l':
rc = RTStrToDoubleEx(pszString, (char **)&pszString, cchMax, (double *)pvDst);
break;
case 'L':
rc = RTStrToLongDoubleEx(pszString, (char **)&pszString, cchMax, (long double *)pvDst);
break;
}
if (rc != VERR_NO_DIGITS)
*pcMatches += pvDst != NULL;
else
pszString = NULL;
return pszString;
}
#undef vsscanf
int RT_NOCRT(vsscanf)(const char *pszString, const char *pszFormat, va_list va)
{
#ifdef RT_STRICT
const char * const pszFormatStart = pszFormat;
#endif
const char * const pszStart = pszString;
int cMatches = 0;
char chFmt;
while ((chFmt = *pszFormat++) != '\0')
{
switch (chFmt)
{
default:
if (chFmt == *pszString)
pszString++;
else
return cMatches;
break;
/*
* White space will match zero or more whitespace character in the
* source string, no specific type. So, we advance to the next no-space
* character in each of the string.
*/
case ' ': /* See RT_C_IS_SPACE */
case '\t':
case '\n':
case '\r':
case '\v':
case '\f':
while (RT_C_IS_SPACE(*pszFormat))
pszFormat++;
while (RT_C_IS_SPACE(*pszString))
pszFormat++;
break;
/*
* %[*][width][h|l|ll|L|q|t|z|Z|]type
*/
case '%':
{
chFmt = *pszFormat++;
/* Escaped '%s'? */
if (chFmt == '%')
{
if (*pszString == '%')
pszString++;
else
return cMatches;
break;
}
/* Assigning or non-assigning argument? */
bool const fAssign = chFmt != '*';
if (chFmt == '*')
chFmt = *pszFormat++;
/* Width specifier? */
int cchWidth = -1;
if (RT_C_IS_DIGIT(chFmt))
{
cchWidth = chFmt - '0';
for (;;)
{
chFmt = *pszFormat++;
if (!RT_C_IS_DIGIT(chFmt))
break;
cchWidth *= 10;
cchWidth += chFmt - '0';
}
}
/* Size prefix?
We convert 'hh' to 'H', 'll' to 'L', and 'I64' to 'L'. The
latter is for MSC compatibility, of course. */
char chPrefix = '\0';
switch (chFmt)
{
case 'q':
chPrefix = 'L';
RT_FALL_THRU();
case 'L':
case 'j':
case 'z':
case 'Z':
case 't':
chPrefix = chFmt;
chFmt = *pszFormat++;
break;
case 'l':
case 'h':
chPrefix = chFmt;
chFmt = *pszFormat++;
if (chPrefix != 'L' && chFmt == chPrefix)
{
chPrefix = chPrefix == 'l' ? 'L' : 'H';
chFmt = *pszFormat++;
}
break;
case 'I':
if (pszFormat[0] == '6' && pszFormat[1] == '4')
{
chPrefix = 'L';
pszFormat += 2;
}
break;
}
/* Now for the type. */
switch (chFmt)
{
case 'p':
chPrefix = 'j';
RT_FALL_THRU();
case 'd':
case 'i':
case 'o':
case 'u':
case 'x':
case 'X':
{
while (RT_C_IS_SPACE(*pszString))
pszString++;
void *pvDst = NULL;
if (fAssign)
pvDst = va_arg(va, void *); /* This ought to work most place... Probably not standard conforming. */
pszString = rtNoCrtScanInt(pszString,
chFmt == 'i' ? 0 : chFmt == 'd' || chFmt == 'u' ? 10 : chFmt == 'o' ? 8 : 16,
chFmt == 'd' || chFmt == 'i' /* fSigned */,
chPrefix, cchWidth, pvDst, &cMatches);
if (!pszString)
return cMatches;
break;
}
case 'a':
case 'A':
case 'e':
case 'E':
case 'f':
case 'F':
case 'g':
case 'G':
{
while (RT_C_IS_SPACE(*pszString))
pszString++;
/* Note! We don't really give a hoot what input format type we're given,
we keep and open mind and acceept whatever we find that looks like
floating point. This is doubtfully standard compliant. */
void *pvDst = NULL;
if (fAssign)
pvDst = va_arg(va, void *); /* This ought to work most place... Probably not standard conforming. */
pszString = rtNoCrtScanFloat(pszString, chPrefix, cchWidth, pvDst, &cMatches);
if (!pszString)
return cMatches;
break;
}
case 'n':
{
if (fAssign)
{
void *pvDst = va_arg(va, void *);
rtNoCrtStorInt(pvDst, chPrefix, (size_t)(pszString - pszStart));
}
break;
}
case 'c':
if (chPrefix != 'l' && chPrefix != 'L')
{
/* no whitespace skipped for %c */
char *pchDst = NULL;
if (fAssign)
pchDst = va_arg(va, char *);
pszString = rtNoCrtScanChars(pszString, cchWidth < 0 ? 1U : (unsigned)cchWidth, pchDst, &cMatches);
break;
}
RT_FALL_THRU();
case 'C':
AssertMsgFailedReturn(("Unsupported sscanf type: C/Lc (%s)\n", pszFormatStart), cMatches);
break;
case 's':
if (chPrefix != 'l' && chPrefix != 'L')
{
while (RT_C_IS_SPACE(*pszString))
pszString++;
char *pszDst = NULL;
if (fAssign)
pszDst = va_arg(va, char *);
pszString = rtNoCrtScanString(pszString, cchWidth < 0 ? RTSTR_MAX : (unsigned)cchWidth,
pszDst, &cMatches);
}
RT_FALL_THRU();
case 'S':
while (RT_C_IS_SPACE(*pszString))
pszString++;
AssertMsgFailedReturn(("Unsupported sscanf type: S/Ls (%s)\n", pszFormatStart), cMatches);
break;
default:
AssertMsgFailedReturn(("Unsupported sscanf type: %c (%s)\n", chFmt, pszFormatStart), cMatches);
}
break;
}
}
}
return cMatches;
}
RT_ALIAS_AND_EXPORT_NOCRT_SYMBOL(vsscanf);
|
