-#ifndef HAVE_MKSTEMP
-static char *unique_filename (const char *path, const char *prefix)
-#else
-static char *unique_filename (const char *path, const char *prefix, int *pFd)
-#endif
+/* this is based on code taken from the GNU libc, distributed under the LGPL license */
+
+/* Generate a unique temporary file name from TEMPLATE.
+
+ TEMPLATE has the form:
+
+ <path>/ccXXXXXX<suffix>
+
+ SUFFIX_LEN tells us how long <suffix> is (it can be zero length).
+
+ The last six characters of TEMPLATE before <suffix> 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 mkstemps (char* _template, int suffix_len)
{
-#ifndef HAVE_MKSTEMP
-#ifndef X_NOT_POSIX
- return ((char *) tempnam (path, prefix));
-#else
- char tempFile[PATH_MAX];
- char *tmp;
+ static const char letters[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
+ char *XXXXXX;
+ int len;
+ int count;
+ int value;
+
+ len = strlen (_template);
+
+ if ((int) len < 6 + suffix_len || strncmp (&_template[len - 6 - suffix_len], "XXXXXX", 6))
+ return -1;
+
+ XXXXXX = &_template[len - 6 - suffix_len];
+
+ value = rand();
+ for (count = 0; count < 256; ++count)
+ {
+ int 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;
+}