65 lines
1.9 KiB
C
65 lines
1.9 KiB
C
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/* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <string.h>
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#include <errno.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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/* Generate a unique temporary file name from TEMPLATE.
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The last six characters of TEMPLATE must be "XXXXXX";
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they are replaced with a string that makes the filename unique.
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Returns a file descriptor open on the file for reading and writing. */
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int
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DEFUN(mkstemp, (template), char *template)
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{
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static CONST char letters[]
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= "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
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size_t len;
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size_t i;
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len = strlen (template);
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if (len < 6 || strcmp (&template[len - 6], "XXXXXX"))
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{
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errno = EINVAL;
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return -1;
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}
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if (sprintf (&template[len - 5], "%.5u",
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(unsigned int) getpid () % 100000) != 5)
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/* Inconceivable lossage. */
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return -1;
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for (i = 0; i < sizeof (letters); ++i)
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{
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int fd;
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template[len - 6] = letters[i];
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fd = open (template, O_RDWR|O_CREAT|O_EXCL, 0666);
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if (fd >= 0)
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return fd;
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}
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/* We return the null string if we can't find a unique file name. */
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template[0] = '\0';
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return -1;
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}
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