62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
/* 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 <unistd.h>
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#include <stdio.h>
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#include <sys/types.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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char *
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DEFUN(mktemp, (template), char *template)
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{
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static CONST char letters[]
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= "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
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static pid_t oldpid = (pid_t) 0;
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pid_t pid = __getpid();
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static size_t count;
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size_t len;
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char c;
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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 template;
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}
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if (pid != oldpid)
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{
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oldpid = pid;
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count = 0;
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}
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c = letters[count++];
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count %= sizeof(letters) - 1;
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if (sprintf (&template[len - 6], "%c%.5u",
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c, (unsigned int) pid % 100000) != 6)
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return NULL;
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return template;
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}
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