Import guile-1.8 as multiple upstream tarball component

[lilypond.git] / guile18 / libguile / mkstemp.c

diff --git a/guile18/libguile/mkstemp.c b/guile18/libguile/mkstemp.c
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+++ b/guile18/libguile/mkstemp.c
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+/* Copyright (C) 1991, 1992, 1996, 1998, 2001, 2006 Free Software Foundation, Inc.
+   This file is derived from mkstemps.c from the GNU Libiberty Library
+   which in turn is derived from the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+   Boston, MA 02110-1301, USA. 
+*/
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include "libguile/__scm.h"
+
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
+#include <errno.h>
+#include <stdio.h>
+#include <fcntl.h>
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#ifdef HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+#ifdef __MINGW32__
+#include <process.h>
+#endif
+
+#ifndef TMP_MAX
+#define TMP_MAX 16384
+#endif
+
+/* We provide this prototype to avoid compiler warnings.  If this ever
+   conflicts with a declaration in a system header file, we'll find
+   out, because we should include that header file here.  */
+int mkstemp (char *);
+
+/* Generate a unique temporary file name from TEMPLATE.
+
+   TEMPLATE has the form:
+
+   <path>/ccXXXXXX
+
+   The last six characters of TEMPLATE must be "XXXXXX"; they are
+   replaced with a string that makes the filename unique.
+
+   Returns a file descriptor open on the file for reading and writing.  */
+int
+mkstemp (template)
+     char *template;
+{
+  static const char letters[]
+    = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
+  static scm_t_uint64 value;
+#ifdef HAVE_GETTIMEOFDAY
+  struct timeval tv;
+#endif
+  char *XXXXXX;
+  size_t len;
+  int count;
+
+  len = strlen (template);
+
+  if ((int) len < 6
+      || strncmp (&template[len - 6], "XXXXXX", 6))
+    {
+      return -1;
+    }
+
+  XXXXXX = &template[len - 6];
+
+#ifdef HAVE_GETTIMEOFDAY
+  /* Get some more or less random data.  */
+  gettimeofday (&tv, NULL);
+  value += ((scm_t_uint64) tv.tv_usec << 16) ^ tv.tv_sec ^ getpid ();
+#else
+  value += getpid ();
+#endif
+
+  for (count = 0; count < TMP_MAX; ++count)
+    {
+      scm_t_uint64 v = value;
+      int fd;
+
+      /* Fill in the random bits.  */
+      XXXXXX[0] = letters[v % 62];
+      v /= 62;
+      XXXXXX[1] = letters[v % 62];
+      v /= 62;
+      XXXXXX[2] = letters[v % 62];
+      v /= 62;
+      XXXXXX[3] = letters[v % 62];
+      v /= 62;
+      XXXXXX[4] = letters[v % 62];
+      v /= 62;
+      XXXXXX[5] = letters[v % 62];
+
+      fd = open (template, O_RDWR|O_CREAT|O_EXCL, 0600);
+      if (fd >= 0)
+       /* The file does not exist.  */
+       return fd;
+
+      /* This is a random value.  It is only necessary that the next
+        TMP_MAX values generated by adding 7777 to VALUE are different
+        with (module 2^32).  */
+      value += 7777;
+    }
+
+  /* We return the null string if we can't find a unique file name.  */
+  template[0] = '\0';
+  return -1;
+}