https://sourceware.org/bugzilla/show_bug.cgi?id=25713
--- Comment #26 from Fred Eisele <fredrick.eisele at gmail dot com> ---
Some tweaks needed to me made to get the _fopen() to work properly.
#include <stdio.h>
#include <errno.h>
#include <conio.h>
#include <stdlib.h>
#include <windows.h>
/* Mark FILE as close-on-exec. Return FILE. FILE may be NULL, in
which case nothing is done. */
static FILE *
close_on_exec(FILE *file) {
#if defined (HAVE_FILENO) && defined (F_GETFD)
if (file)
{
int fd = fileno (file);
int old = fcntl (fd, F_GETFD, 0);
if (old >= 0)
fcntl (fd, F_SETFD, old | FD_CLOEXEC);
}
#endif
return file;
}
/**
*
https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-getfullpathnamew
*
https://docs.microsoft.com/en-us/windows/win32/api/stringapiset/nf-stringapiset-multibytetowidechar
* @return
*/
int main() {
wchar_t **lpFilePart = {NULL};
const wchar_t prefix[] = L"\\\\?\\";
const char *paths[] = {
"C:\\tools\\foo.o",
"C:\\tools\\.\\foo.o",
"C:\\tools\\msys64\\..\\foo.o",
".\\foo.o",
".\\increasepath\\increasepath\\increasepath\\increasepath\\"
"increasepath\\increasepath\\increasepath\\increasepath\\increasepath\\"
"increasepath\\increasepath\\increasepath\\increasepath\\increasepath\\"
"increasepath\\increasepath\\increasepath\\increasepath\\increasepath\\"
"increasepath\\increasepath\\test.o",
".\\increasepath\\increasepath\\.\\.\\increasepath\\increasepath\\"
"increasepath\\increasepath\\..\\..\\increasepath\\increasepath\\increasepath\\increasepath\\increasepath\\"
"increasepath\\increasepath\\increasepath\\increasepath\\increasepath\\"
"increasepath\\increasepath\\increasepath\\increasepath\\increasepath\\"
"increasepath\\increasepath\\test.o"
};
setbuf(stderr, NULL);
int loopLimit = sizeof(paths) / sizeof(*paths);
for (int ix = 0; ix < loopLimit; ix++) {
const char *filename = paths[ix];
const char modes[] = "w+b";
FILE *file;
fprintf(stderr, "====================================================\n");
/* PR 25713: Handle extra long path names possibly containing '..' and '.'.
*/
wchar_t **lpFilePart = {NULL};
const char ccs[] = ", ccs=UNICODE";
const int partPathLen = strlen(filename) + 1;
char *partPathOrig = calloc(partPathLen, sizeof(char));
/*
* Convert any UNIX style path separators into the DOS form.
*/
int ix;
for (ix = 0; ix < partPathLen; ix++)
switch (filename[ix]) {
case '/':
partPathOrig[ix] = '\\';
break;
default:
partPathOrig[ix] = filename[ix];
}
partPathOrig[ix] = 0;
fprintf(stderr, "part: path = %s\n", partPathOrig);
/*
* Converting from the partial path from ascii to unicode.
* Calling with lpWideCharStr set to null returns the length.
* Calling with cbMultiByte set to -1 includes the terminating null.
*/
int partPathWSize = MultiByteToWideChar(CP_UTF8, 0, partPathOrig, -1, NULL,
0);
wchar_t *partPath = calloc(partPathWSize, sizeof(wchar_t));
MultiByteToWideChar(CP_UTF8, 0, partPathOrig, -1, partPath, partPathWSize);
fprintf(stderr, "part: wpath = %ls\n", partPath);
/*
* Getting the full path from the provided partial path.
* Calling twice: 1) get the length; 2) resolve the path.
*/
long fullPathWSize = GetFullPathNameW(partPath, 0, NULL, lpFilePart);
wchar_t *fullPathTmp = calloc(fullPathWSize, sizeof(wchar_t));
long copiedPathLen = GetFullPathNameW(partPath, fullPathWSize, fullPathTmp,
lpFilePart);
fprintf(stderr, "full: errno = %d error = %s\n", errno, strerror(errno));
wchar_t *fullPath = calloc(fullPathWSize + sizeof(prefix),
sizeof(wchar_t));
wcscpy(fullPath, prefix);
wcscat(fullPath, fullPathTmp);
free(partPath);
int remodelSize = strlen(modes) + sizeof(ccs) + 1;
char *remode = calloc(remodelSize, sizeof(char));
strcpy(remode, modes);
strcat(remode, ccs);
wchar_t* remodel = calloc(remodelSize, sizeof(wchar_t));
MultiByteToWideChar(CP_UTF8, 0, remode, -1, remodel, remodelSize);
free(remode);
fprintf(stderr, "file: mode = %ls, fullPath = %ls\n", remodel, fullPath,
remodel);
file = _wfopen(fullPath, remodel);
fprintf(stderr, "file: errno = %d error = %s\n", errno, strerror(errno));
free(remodel);
file = close_on_exec(file);
free(fullPath);
}
return 0;
}
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