diff options
Diffstat (limited to 'sysdeps/posix/tempname.c')
| -rw-r--r-- | sysdeps/posix/tempname.c | 90 |
1 files changed, 35 insertions, 55 deletions
diff --git a/sysdeps/posix/tempname.c b/sysdeps/posix/tempname.c index 291817c9ef..82e0243132 100644 --- a/sysdeps/posix/tempname.c +++ b/sysdeps/posix/tempname.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1991, 92, 93, 94, 95, 96, 97 Free Software Foundation, Inc. +/* Copyright (C) 1991,92,93,94,95,96,97,98 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -16,15 +16,17 @@ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ -#include <errno.h> #include <stddef.h> +#include <stdint.h> #include <stdio.h> #include <stdlib.h> #include <string.h> +#include <errno.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <unistd.h> +#include <sys/time.h> #ifdef USE_IN_LIBIO # include "libioP.h" @@ -87,14 +89,11 @@ __stdio_gen_tempname (char *buf, size_t bufsize, const char *dir, { int saverrno = errno; static const char tmpdir[] = P_tmpdir; - static size_t indices[2]; - size_t *idx; -#if 0 - static pid_t oldpid = (pid_t) 0; -#endif - pid_t pid = __getpid(); - register size_t len, plen, dlen; - int wrapped; + size_t plen, dlen, len; + char *XXXXXX; + static uint64_t value; + struct timeval tv; + int count; if (dir_search) { @@ -132,56 +131,37 @@ __stdio_gen_tempname (char *buf, size_t bufsize, const char *dir, else plen = 0; - if (dir != tmpdir && !strcmp (dir, tmpdir)) - dir = tmpdir; - idx = &indices[(plen == 0 && dir == tmpdir) ? 1 : 0]; - -#if 0 - /* XXX Is this ever useful??? At least when using a thread package - which uses different PIDs for the threads it is not helpful. */ - if (pid != oldpid) - { - oldpid = pid; - indices[0] = indices[1] = 0; - } -#endif - - wrapped = 0; /* We have not yet wrapped around the index counter. */ - len = dlen + 1 + plen + 5 + 3; - while (1) - { - size_t i; + len = __snprintf (buf, bufsize, "%.*s/%.*sXXXXXX", + (int) dlen, dir, (int) plen, pfx); - if (*idx >= ((sizeof (letters) - 1) * (sizeof (letters) - 1) * - (sizeof (letters) - 1))) - { - if (wrapped) - /* We really wrapped around this call. Can't believe it - but nevertheless stop the endless loop. */ - break; + if (len < dlen + plen + 7) + { + __set_errno (EINVAL); + return NULL; + } - indices[0] = indices[1] = 0; - wrapped = 1; - } - - i = (*idx)++; + XXXXXX = &buf[dlen + plen + 1]; - /* Construct a file name and see if it already exists. + /* Get some more or less random data. */ + __gettimeofday (&tv, NULL); + value += ((uint64_t) tv.tv_usec << 16) ^ tv.tv_sec ^ __getpid (); - We use a single counter in *IDX to cycle each of three - character positions through each of 62 possible letters. */ + for (count = 0; count < TMP_MAX; value += 7777, ++count) + { + uint64_t v = value; - if (__snprintf (buf, bufsize, "%.*s/%.*s%.5d%c%c%c", - (int) dlen, dir, (int) plen, - pfx, pid % 100000, - letters[i % (sizeof (letters) - 1)], - letters[(i / (sizeof (letters) - 1)) - % (sizeof (letters) - 1)], - letters[(i / ((sizeof (letters) - 1) * - (sizeof (letters) - 1))) - % (sizeof (letters) - 1)] - ) != (int) len) - return NULL; + /* 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]; if (streamptr != NULL) { |