[thirdparty/cups.git] / cups / tempfile.c

/*
 * "$Id: tempfile.c,v 1.3 2002/01/02 17:58:41 mike Exp $"
 *
 *   Temp file utilities for the Common UNIX Printing System (CUPS).
 *
 *   Copyright 1997-2002 by Easy Software Products.
 *
 *   These coded instructions, statements, and computer programs are the
 *   property of Easy Software Products and are protected by Federal
 *   copyright law.  Distribution and use rights are outlined in the file
 *   "LICENSE.txt" which should have been included with this file.  If this
 *   file is missing or damaged please contact Easy Software Products
 *   at:
 *
 *       Attn: CUPS Licensing Information
 *       Easy Software Products
 *       44141 Airport View Drive, Suite 204
 *       Hollywood, Maryland 20636-3111 USA
 *
 *       Voice: (301) 373-9603
 *       EMail: cups-info@cups.org
 *         WWW: http://www.cups.org
 *
 * Contents:
 *
 *   cupsTempFd()   - Create a temporary file.
 *   cupsTempFile() - Generate a temporary filename.
 */

/*
 * Include necessary headers...
 */

#include "cups.h"
#include "string.h"
#include "debug.h"
#include <stdlib.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/stat.h>
#if defined(WIN32) || defined(__EMX__)
#  include <io.h>
#else
#  include <unistd.h>
#endif /* WIN32 || __EMX__ */


/*
 * 'cupsTempFd()' - Create a temporary file.
 */

int					/* O - New file descriptor */
cupsTempFd(char *filename,		/* I - Pointer to buffer */
           int  len)			/* I - Size of buffer */
{
  int		fd;			/* File descriptor for temp file */
#ifdef WIN32
  char		tmpdir[1024];		/* Windows temporary directory */
  DWORD		curtime;		/* Current time */
#else
  char		*tmpdir;		/* TMPDIR environment var */
  struct timeval curtime;		/* Current time */
#endif /* WIN32 */
  static char	buf[1024] = "";		/* Buffer if you pass in NULL and 0 */


 /*
  * See if a filename was specified...
  */

  if (filename == NULL)
  {
    filename = buf;
    len      = sizeof(buf);
  }

 /*
  * See if TMPDIR is defined...
  */

#ifdef WIN32
  GetTempPath(sizeof(tmpdir), tmpdir);
#else
  if ((tmpdir = getenv("TMPDIR")) == NULL)
  {
   /*
    * Put root temp files in restricted temp directory...
    */

    if (getuid() == 0)
      tmpdir = CUPS_REQUESTS "/tmp";
    else
      tmpdir = "/var/tmp";
  }
#endif /* WIN32 */

 /*
  * Make the temporary name using the specified directory...
  */

  do
  {
#ifdef WIN32
   /*
    * Get the current time of day...
    */

    curtime = GetTickCount();

   /*
    * Format a string using the hex time values...
    */

    snprintf(filename, len - 1, "%s/%08lx", tmpdir, curtime);
#else
   /*
    * Get the current time of day...
    */

    gettimeofday(&curtime, NULL);

   /*
    * Format a string using the hex time values...
    */

    snprintf(filename, len - 1, "%s/%08lx%05lx", tmpdir,
             curtime.tv_sec, curtime.tv_usec);
#endif /* WIN32 */

   /*
    * Open the file in "exclusive" mode, making sure that we don't
    * stomp on an existing file or someone's symlink crack...
    */

#ifdef O_NOFOLLOW
    fd = open(filename, O_RDWR | O_CREAT | O_EXCL | O_NOFOLLOW, 0600);
#else
    fd = open(filename, O_RDWR | O_CREAT | O_EXCL, 0600);
#endif /* O_NOFOLLOW */

    if (fd < 0 && (errno == EPERM || errno == ENOENT))
      break; /* Stop immediately if permission denied or the dir doesn't exist! */
  }
  while (fd < 0);

 /*
  * Return the file descriptor...
  */

  return (fd);
}


/*
 * 'cupsTempFile()' - Generate a temporary filename.
 */

char *					/* O - Filename */
cupsTempFile(char *filename,		/* I - Pointer to buffer */
             int  len)			/* I - Size of buffer */
{
  int		fd;			/* File descriptor for temp file */
  static char	buf[1024] = "";		/* Buffer if you pass in NULL and 0 */


 /*
  * See if a filename was specified...
  */

  if (filename == NULL)
  {
    filename = buf;
    len      = sizeof(buf);
  }

 /*
  * Create the temporary file...
  */

  if ((fd = cupsTempFd(filename, len)) < 0)
    return (NULL);

 /*
  * Close the temp file - it'll be reopened later as needed...
  */

  close(fd);

 /*
  * Return the temp filename...
  */

  return (filename);
}


/*
 * End of "$Id: tempfile.c,v 1.3 2002/01/02 17:58:41 mike Exp $".
 */
Commit	Line	Data
b56e1a4c	1	/*
efb2f309	2	* "$Id: tempfile.c,v 1.3 2002/01/02 17:58:41 mike Exp $"
b56e1a4c	3	*
	4	* Temp file utilities for the Common UNIX Printing System (CUPS).
	5	*
efb2f309	6	* Copyright 1997-2002 by Easy Software Products.
b56e1a4c	7	*
	8	* These coded instructions, statements, and computer programs are the
	9	* property of Easy Software Products and are protected by Federal
	10	* copyright law. Distribution and use rights are outlined in the file
	11	* "LICENSE.txt" which should have been included with this file. If this
	12	* file is missing or damaged please contact Easy Software Products
	13	* at:
	14	*
	15	* Attn: CUPS Licensing Information
	16	* Easy Software Products
	17	* 44141 Airport View Drive, Suite 204
	18	* Hollywood, Maryland 20636-3111 USA
	19	*
	20	* Voice: (301) 373-9603
	21	* EMail: cups-info@cups.org
	22	* WWW: http://www.cups.org
	23	*
	24	* Contents:
	25	*
	26	* cupsTempFd() - Create a temporary file.
	27	* cupsTempFile() - Generate a temporary filename.
	28	*/
	29
	30	/*
	31	* Include necessary headers...
	32	*/
	33
	34	#include "cups.h"
	35	#include "string.h"
	36	#include "debug.h"
	37	#include <stdlib.h>
	38	#include <ctype.h>
	39	#include <errno.h>
	40	#include <fcntl.h>
	41	#include <sys/stat.h>
	42	#if defined(WIN32) \|\| defined(__EMX__)
	43	# include <io.h>
	44	#else
	45	# include <unistd.h>
	46	#endif /* WIN32 \|\| __EMX__ */
	47
	48
	49	/*
	50	* 'cupsTempFd()' - Create a temporary file.
	51	*/
	52
	53	int /* O - New file descriptor */
	54	cupsTempFd(char filename, / I - Pointer to buffer */
	55	int len) /* I - Size of buffer */
	56	{
	57	int fd; /* File descriptor for temp file */
	58	#ifdef WIN32
	59	char tmpdir[1024]; /* Windows temporary directory */
	60	DWORD curtime; /* Current time */
	61	#else
	62	char tmpdir; / TMPDIR environment var */
	63	struct timeval curtime; /* Current time */
	64	#endif /* WIN32 */
	65	static char buf[1024] = ""; /* Buffer if you pass in NULL and 0 */
	66
	67
	68	/*
	69	* See if a filename was specified...
	70	*/
71
72	if (filename == NULL)
73	{
74	filename = buf;
75	len = sizeof(buf);
76	}
77
78	/*
79	* See if TMPDIR is defined...
80	*/
81
82	#ifdef WIN32
83	GetTempPath(sizeof(tmpdir), tmpdir);
84	#else
85	if ((tmpdir = getenv("TMPDIR")) == NULL)
86	{
87	/*
88	* Put root temp files in restricted temp directory...
89	*/
90
91	if (getuid() == 0)
92	tmpdir = CUPS_REQUESTS "/tmp";
93	else
94	tmpdir = "/var/tmp";
95	}
96	#endif /* WIN32 */
97
98	/*
99	* Make the temporary name using the specified directory...
100	*/
101
102	do
103	{
104	#ifdef WIN32
105	/*
106	* Get the current time of day...
107	*/
108
109	curtime = GetTickCount();
110
111	/*
112	* Format a string using the hex time values...
113	*/
114
115	snprintf(filename, len - 1, "%s/%08lx", tmpdir, curtime);
116	#else
117	/*
118	* Get the current time of day...
119	*/
120
121	gettimeofday(&curtime, NULL);
122
123	/*
124	* Format a string using the hex time values...
125	*/
126
127	snprintf(filename, len - 1, "%s/%08lx%05lx", tmpdir,
128	curtime.tv_sec, curtime.tv_usec);
129	#endif /* WIN32 */
130
131	/*
132	* Open the file in "exclusive" mode, making sure that we don't
133	* stomp on an existing file or someone's symlink crack...
134	*/
135
136	#ifdef O_NOFOLLOW
137	fd = open(filename, O_RDWR \| O_CREAT \| O_EXCL \| O_NOFOLLOW, 0600);
138	#else
139	fd = open(filename, O_RDWR \| O_CREAT \| O_EXCL, 0600);
140	#endif /* O_NOFOLLOW */
141
5c5e0e3e	142	if (fd < 0 && (errno == EPERM \|\| errno == ENOENT))
5c5e0e3e	143	break; /* Stop immediately if permission denied or the dir doesn't exist! */
b56e1a4c	144	}
	145	while (fd < 0);
	146
	147	/*
	148	* Return the file descriptor...
	149	*/
	150
	151	return (fd);
	152	}
	153
	154
	155	/*
	156	* 'cupsTempFile()' - Generate a temporary filename.
	157	*/
	158
	159	char * /* O - Filename */
	160	cupsTempFile(char filename, / I - Pointer to buffer */
	161	int len) /* I - Size of buffer */
	162	{
	163	int fd; /* File descriptor for temp file */
	164	static char buf[1024] = ""; /* Buffer if you pass in NULL and 0 */
	165
	166
	167	/*
	168	* See if a filename was specified...
	169	*/
	170
	171	if (filename == NULL)
	172	{
	173	filename = buf;
	174	len = sizeof(buf);
	175	}
	176
	177	/*
	178	* Create the temporary file...
	179	*/
	180
	181	if ((fd = cupsTempFd(filename, len)) < 0)
	182	return (NULL);
	183
	184	/*
	185	* Close the temp file - it'll be reopened later as needed...
	186	*/
	187
	188	close(fd);
	189
	190	/*
	191	* Return the temp filename...
	192	*/
	193
	194	return (filename);
	195	}
	196
	197
	198	/*
efb2f309	199	* End of "$Id: tempfile.c,v 1.3 2002/01/02 17:58:41 mike Exp $".
b56e1a4c	200	*/