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Diffstat (limited to 'src/VBox/Runtime/common/string/nocrt-vsscanf.cpp')
-rw-r--r--src/VBox/Runtime/common/string/nocrt-vsscanf.cpp403
1 files changed, 403 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/string/nocrt-vsscanf.cpp b/src/VBox/Runtime/common/string/nocrt-vsscanf.cpp
new file mode 100644
index 00000000..4f75cde7
--- /dev/null
+++ b/src/VBox/Runtime/common/string/nocrt-vsscanf.cpp
@@ -0,0 +1,403 @@
+/* $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);
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-05 19:21:04 +0000