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| //===-- Windows.cpp ---------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// This file provides Windows support functions
#include "lldb/Host/PosixApi.h"
#include "lldb/Host/windows/windows.h"
#include "llvm/Support/ConvertUTF.h"
#include <assert.h>
#include <cerrno>
#include <ctype.h>
#include <io.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
namespace {
bool utf8ToWide(const char *utf8, wchar_t *buf, size_t bufSize) {
const llvm::UTF8 *sourceStart = reinterpret_cast<const llvm::UTF8 *>(utf8);
size_t sourceLen = strlen(utf8) + 1 /* convert null too */;
llvm::UTF16 *target = reinterpret_cast<llvm::UTF16 *>(buf);
llvm::ConversionFlags flags = llvm::strictConversion;
return llvm::ConvertUTF8toUTF16(&sourceStart, sourceStart + sourceLen, &target,
target + bufSize, flags) == llvm::conversionOK;
}
bool wideToUtf8(const wchar_t *wide, char *buf, size_t bufSize) {
const llvm::UTF16 *sourceStart = reinterpret_cast<const llvm::UTF16 *>(wide);
size_t sourceLen = wcslen(wide) + 1 /* convert null too */;
llvm::UTF8 *target = reinterpret_cast<llvm::UTF8 *>(buf);
llvm::ConversionFlags flags = llvm::strictConversion;
return llvm::ConvertUTF16toUTF8(&sourceStart, sourceStart + sourceLen, &target,
target + bufSize, flags) == llvm::conversionOK;
}
}
int vasprintf(char **ret, const char *fmt, va_list ap) {
char *buf;
int len;
size_t buflen;
va_list ap2;
va_copy(ap2, ap);
len = vsnprintf(NULL, 0, fmt, ap2);
if (len >= 0 &&
(buf = (char *)malloc((buflen = (size_t)(len + 1)))) != NULL) {
len = vsnprintf(buf, buflen, fmt, ap);
*ret = buf;
} else {
*ret = NULL;
len = -1;
}
va_end(ap2);
return len;
}
char *strcasestr(const char *s, const char *find) {
char c, sc;
size_t len;
if ((c = *find++) != 0) {
c = tolower((unsigned char)c);
len = strlen(find);
do {
do {
if ((sc = *s++) == 0)
return 0;
} while ((char)tolower((unsigned char)sc) != c);
} while (strncasecmp(s, find, len) != 0);
s--;
}
return const_cast<char *>(s);
}
char *realpath(const char *name, char *resolved) {
char *retname = NULL;
/* SUSv3 says we must set `errno = EINVAL', and return NULL,
* if `name' is passed as a NULL pointer.
*/
if (name == NULL) {
errno = EINVAL;
return NULL;
}
/* Otherwise, `name' must refer to a readable filesystem object,
* if we are going to resolve its absolute path name.
*/
wchar_t wideNameBuffer[PATH_MAX];
wchar_t *wideName = wideNameBuffer;
if (!utf8ToWide(name, wideName, PATH_MAX)) {
errno = EINVAL;
return NULL;
}
if (_waccess(wideName, 4) != 0)
return NULL;
/* If `name' didn't point to an existing entity,
* then we don't get to here; we simply fall past this block,
* returning NULL, with `errno' appropriately set by `access'.
*
* When we _do_ get to here, then we can use `_fullpath' to
* resolve the full path for `name' into `resolved', but first,
* check that we have a suitable buffer, in which to return it.
*/
if ((retname = resolved) == NULL) {
/* Caller didn't give us a buffer, so we'll exercise the
* option granted by SUSv3, and allocate one.
*
* `_fullpath' would do this for us, but it uses `malloc', and
* Microsoft's implementation doesn't set `errno' on failure.
* If we don't do this explicitly ourselves, then we will not
* know if `_fullpath' fails on `malloc' failure, or for some
* other reason, and we want to set `errno = ENOMEM' for the
* `malloc' failure case.
*/
retname = (char *)malloc(PATH_MAX);
if (retname == NULL) {
errno = ENOMEM;
return NULL;
}
}
/* Otherwise, when we do have a valid buffer,
* `_fullpath' should only fail if the path name is too long.
*/
wchar_t wideFullPathBuffer[PATH_MAX];
wchar_t *wideFullPath;
if ((wideFullPath = _wfullpath(wideFullPathBuffer, wideName, PATH_MAX)) ==
NULL) {
errno = ENAMETOOLONG;
return NULL;
}
// Do a LongPath<->ShortPath roundtrip so that case is resolved by OS
// FIXME: Check for failure
size_t initialLength = wcslen(wideFullPath);
GetShortPathNameW(wideFullPath, wideNameBuffer, PATH_MAX);
GetLongPathNameW(wideNameBuffer, wideFullPathBuffer, initialLength + 1);
// Convert back to UTF-8
if (!wideToUtf8(wideFullPathBuffer, retname, PATH_MAX)) {
errno = EINVAL;
return NULL;
}
// Force drive to be upper case
if (retname[1] == ':')
retname[0] = toupper(retname[0]);
return retname;
}
#ifdef _MSC_VER
char *basename(char *path) {
char *l1 = strrchr(path, '\\');
char *l2 = strrchr(path, '/');
if (l2 > l1)
l1 = l2;
if (!l1)
return path; // no base name
return &l1[1];
}
char *dirname(char *path) {
char *l1 = strrchr(path, '\\');
char *l2 = strrchr(path, '/');
if (l2 > l1)
l1 = l2;
if (!l1)
return NULL; // no dir name
*l1 = 0;
return path;
}
int strcasecmp(const char *s1, const char *s2) { return stricmp(s1, s2); }
int strncasecmp(const char *s1, const char *s2, size_t n) {
return strnicmp(s1, s2, n);
}
#if _MSC_VER < 1900
namespace lldb_private {
int vsnprintf(char *buffer, size_t count, const char *format, va_list argptr) {
int old_errno = errno;
int r = ::vsnprintf(buffer, count, format, argptr);
int new_errno = errno;
buffer[count - 1] = '\0';
if (r == -1 || r == count) {
FILE *nul = fopen("nul", "w");
int bytes_written = ::vfprintf(nul, format, argptr);
fclose(nul);
if (bytes_written < count)
errno = new_errno;
else {
errno = old_errno;
r = bytes_written;
}
}
return r;
}
} // namespace lldb_private
#endif
#endif // _MSC_VER
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