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Provide a default progname on Windows

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[guillem@hadrons.org:
 - Remove .exe extension from default program name.
 - Call reallocarray() once by switching to a «do {} while» loop.
 - Minor coding style fixes. ]

Signed-off-by: Guillem Jover <guillem@hadrons.org>
This commit is contained in:
Aaron Dierking 2018-07-05 14:47:47 -07:00 committed by Guillem Jover
parent 37a9b56c05
commit 68f980c90d
1 changed files with 71 additions and 1 deletions
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72
src/progname.c
View File

@ -1,6 +1,7 @@
/*
* Copyright © 2006 Robert Millan
* Copyright © 2010-2012 Guillem Jover <guillem@hadrons.org>
* Copyright © 2018 Facebook, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@ -30,11 +31,16 @@
* <https://sourceware.org/ml/libc-alpha/2006-03/msg00125.html>.
*/
#include <sys/param.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#ifdef _WIN32
#include <Windows.h>
#include <shlwapi.h>
#endif
#if defined(_WIN32) || defined(__WIN32__) || defined(__WINDOWS__)
#ifdef _WIN32
#define LIBBSD_IS_PATHNAME_SEPARATOR(c) ((c) == '/' || (c) == '\\')
#else
#define LIBBSD_IS_PATHNAME_SEPARATOR(c) ((c) == '/')
@ -56,6 +62,70 @@ getprogname(void)
/* getexecname(3) returns an absolute pathname, normalize it. */
if (__progname == NULL)
setprogname(getexecname());
#elif defined(_WIN32)
if (__progname == NULL) {
WCHAR *wpath = NULL;
WCHAR *wname = NULL;
WCHAR *wext = NULL;
DWORD wpathsiz = MAX_PATH / 2;
DWORD len, i;
char *mbname = NULL;
int mbnamesiz;
/* Use the Unicode version of this function to support long
* paths. MAX_PATH isn't actually the maximum length of a
* path in this case. */
do {
WCHAR *wpathnew;
wpathsiz *= 2;
wpathsiz = MIN(wpathsiz, UNICODE_STRING_MAX_CHARS);
wpathnew = reallocarray(wpath, wpathsiz, sizeof(*wpath));
if (wpathnew == NULL)
goto done;
wpath = wpathnew;
len = GetModuleFileNameW(NULL, wpath, wpathsiz);
if (wpathsiz == UNICODE_STRING_MAX_CHARS)
goto done;
} while (wpathsiz == len);
if (len == 0)
goto done;
/* GetModuleFileNameW() retrieves an absolute path. Locate the
* filename now to only convert necessary characters and save
* memory. */
wname = wpath;
for (i = len; i > 0; i--) {
if (LIBBSD_IS_PATHNAME_SEPARATOR(wpath[i - 1])) {
wname = wpath + i;
break;
}
}
/* Remove any trailing extension, such as '.exe', to make the
* behavior mach the non-Windows systems. */
wext = PathFindExtensionW(wname);
wext[0] = '\0';
mbnamesiz = WideCharToMultiByte(CP_UTF8, 0, wname, -1, NULL,
0, NULL, NULL);
if (mbnamesiz == 0)
goto done;
mbname = malloc(mbnamesiz);
if (mbname == NULL)
goto done;
mbnamesiz = WideCharToMultiByte(CP_UTF8, 0, wname, -1, mbname,
mbnamesiz, NULL, NULL);
if (mbnamesiz == 0)
goto done;
__progname = mbname;
mbname = NULL;
done:
free(wpath);
free(mbname);
}
#endif
return __progname;