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/*
* 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
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Rejected in glibc
* <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
#ifdef _WIN32
#define LIBBSD_IS_PATHNAME_SEPARATOR(c) ((c) == '/' || (c) == '\\')
#else
#define LIBBSD_IS_PATHNAME_SEPARATOR(c) ((c) == '/')
#endif
#ifdef HAVE___PROGNAME
extern const char *__progname;
#else
static const char *__progname = NULL;
#endif
const char *
getprogname(void)
{
#if defined(HAVE_PROGRAM_INVOCATION_SHORT_NAME)
if (__progname == NULL)
__progname = program_invocation_short_name;
#elif defined(HAVE_GETEXECNAME)
/* 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;
}
void
setprogname(const char *progname)
{
size_t i;
for (i = strlen(progname); i > 0; i--) {
if (LIBBSD_IS_PATHNAME_SEPARATOR(progname[i - 1])) {
__progname = progname + i;
return;
}
}
__progname = progname;
}
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