kc3-lang/libbsd/src/progname.c

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• Hash : 68f980c9
  Author :
  Date : 2018-07-05T14:47:47
  

  Provide a default progname on Windows [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>

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• src/progname.c

• /*
   * 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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