text: /* Adapted from NetBSB libc by Dieter Baron */
  
  /*	NetBSD: gettemp.c,v 1.13 2003/12/05 00:57:36 uebayasi Exp 	*/
  
  /*
   * Copyright (c) 1987, 1993
   *	The Regents of the University of California.  All rights reserved.
   *
   * 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. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
   */
  
  #include <sys/types.h>
  #include <sys/stat.h>
  
  #include <assert.h>
  #include <ctype.h>
  #include <errno.h>
  #include <fcntl.h>
  #ifdef _WIN32
  #include <io.h>
  #endif
  #include <stdio.h>
  #include <stdlib.h>
  #ifndef _WIN32
  #include <unistd.h>
  #endif
  
  #ifndef O_BINARY
  #define O_BINARY 0
  #endif
  
  
  int
  _zip_mkstemp(char *path)
  {
  #ifdef _WIN32
  	int ret;
  	ret = _creat(_mktemp(path), _S_IREAD|_S_IWRITE);
  	if (ret == -1) {
  		return 0;
  	} else {
  		return ret;
  	}
  #else
  	int fd;   
  	char *start, *trv;
  	struct stat sbuf;
  	pid_t pid;
  
  	/* To guarantee multiple calls generate unique names even if
  	   the file is not created. 676 different possibilities with 7
  	   or more X's, 26 with 6 or less. */
  	static char xtra[2] = "aa";
  	int xcnt = 0;
  
  	pid = getpid();
  
  	/* Move to end of path and count trailing X's. */
  	for (trv = path; *trv; ++trv)
  		if (*trv == 'X')
  			xcnt++;
  		else
  			xcnt = 0;	
  
  	/* Use at least one from xtra.  Use 2 if more than 6 X's. */
  	if (*(trv - 1) == 'X')
  		*--trv = xtra[0];
  	if (xcnt > 6 && *(trv - 1) == 'X')
  		*--trv = xtra[1];
  
  	/* Set remaining X's to pid digits with 0's to the left. */
  	while (*--trv == 'X') {
  		*trv = (pid % 10) + '0';
  		pid /= 10;
  	}
  
  	/* update xtra for next call. */
  	if (xtra[0] != 'z')
  		xtra[0]++;
  	else {
  		xtra[0] = 'a';
  		if (xtra[1] != 'z')
  			xtra[1]++;
  		else
  			xtra[1] = 'a';
  	}
  
  	/*
  	 * check the target directory; if you have six X's and it
  	 * doesn't exist this runs for a *very* long time.
  	 */
  	for (start = trv + 1;; --trv) {
  		if (trv <= path)
  			break;
  		if (*trv == '/') {
  			*trv = '\0';
  			if (stat(path, &sbuf))
  				return (0);
  			if (!S_ISDIR(sbuf.st_mode)) {
  				errno = ENOTDIR;
  				return (0);
  			}
  			*trv = '/';
  			break;
  		}
  	}
  
  	for (;;) {
  		if ((fd=open(path, O_CREAT|O_EXCL|O_RDWR|O_BINARY, 0600)) >= 0)
  			return (fd);
  		if (errno != EEXIST)
  			return (0);
  
  		/* tricky little algorithm for backward compatibility */
  		for (trv = start;;) {
  			if (!*trv)
  				return (0);
  			if (*trv == 'z')
  				*trv++ = 'a';
  			else {
  				if (isdigit((unsigned char)*trv))
  					*trv = 'a';
  				else
  					++*trv;
  				break;
  			}
  		}
  	}
  	/*NOTREACHED*/
  #endif
  }
  