diff options
Diffstat (limited to 'lib/sh/tmpfile.c')
| -rw-r--r-- | lib/sh/tmpfile.c | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/lib/sh/tmpfile.c b/lib/sh/tmpfile.c new file mode 100644 index 0000000..a87c254 --- /dev/null +++ b/lib/sh/tmpfile.c @@ -0,0 +1,220 @@ +/* + * tmpfile.c - functions to create and safely open temp files for the shell. + */ + +/* Copyright (C) 2000 Free Software Foundation, Inc. + + This file is part of GNU Bash, the Bourne Again SHell. + + Bash is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + Bash 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with Bash. If not, see <http://www.gnu.org/licenses/>. +*/ + +#include <config.h> + +#include <bashtypes.h> +#include <posixstat.h> +#include <posixtime.h> +#include <filecntl.h> + +#if defined (HAVE_UNISTD_H) +# include <unistd.h> +#endif + +#include <stdio.h> +#include <errno.h> + +#include <shell.h> + +#ifndef errno +extern int errno; +#endif + +#define BASEOPENFLAGS (O_CREAT | O_TRUNC | O_EXCL) + +#define DEFAULT_TMPDIR "." /* bogus default, should be changed */ +#define DEFAULT_NAMEROOT "shtmp" + +extern pid_t dollar_dollar_pid; + +static char *get_sys_tmpdir __P((void)); +static char *get_tmpdir __P((int)); + +static char *sys_tmpdir = (char *)NULL; +static int ntmpfiles; +static int tmpnamelen = -1; +static unsigned long filenum = 1L; + +static char * +get_sys_tmpdir () +{ + if (sys_tmpdir) + return sys_tmpdir; + +#ifdef P_tmpdir + sys_tmpdir = P_tmpdir; + if (file_iswdir (sys_tmpdir)) + return sys_tmpdir; +#endif + + sys_tmpdir = "/tmp"; + if (file_iswdir (sys_tmpdir)) + return sys_tmpdir; + + sys_tmpdir = "/var/tmp"; + if (file_iswdir (sys_tmpdir)) + return sys_tmpdir; + + sys_tmpdir = "/usr/tmp"; + if (file_iswdir (sys_tmpdir)) + return sys_tmpdir; + + sys_tmpdir = DEFAULT_TMPDIR; + + return sys_tmpdir; +} + +static char * +get_tmpdir (flags) + int flags; +{ + char *tdir; + + tdir = (flags & MT_USETMPDIR) ? get_string_value ("TMPDIR") : (char *)NULL; + if (tdir && (file_iswdir (tdir) == 0 || strlen (tdir) > PATH_MAX)) + tdir = 0; + + if (tdir == 0) + tdir = get_sys_tmpdir (); + +#if defined (HAVE_PATHCONF) && defined (_PC_NAME_MAX) + if (tmpnamelen == -1) + tmpnamelen = pathconf (tdir, _PC_NAME_MAX); +#else + tmpnamelen = 0; +#endif + + return tdir; +} + +char * +sh_mktmpname (nameroot, flags) + char *nameroot; + int flags; +{ + char *filename, *tdir, *lroot; + struct stat sb; + int r, tdlen; + + filename = (char *)xmalloc (PATH_MAX + 1); + tdir = get_tmpdir (flags); + tdlen = strlen (tdir); + + lroot = nameroot ? nameroot : DEFAULT_NAMEROOT; + +#ifdef USE_MKTEMP + sprintf (filename, "%s/%s.XXXXXX", tdir, lroot); + if (mktemp (filename) == 0) + { + free (filename); + filename = NULL; + } +#else /* !USE_MKTEMP */ + while (1) + { + filenum = (filenum << 1) ^ + (unsigned long) time ((time_t *)0) ^ + (unsigned long) dollar_dollar_pid ^ + (unsigned long) ((flags & MT_USERANDOM) ? get_random_number () : ntmpfiles++); + sprintf (filename, "%s/%s-%lu", tdir, lroot, filenum); + if (tmpnamelen > 0 && tmpnamelen < 32) + filename[tdlen + 1 + tmpnamelen] = '\0'; +# ifdef HAVE_LSTAT + r = lstat (filename, &sb); +# else + r = stat (filename, &sb); +# endif + if (r < 0 && errno == ENOENT) + break; + } +#endif /* !USE_MKTEMP */ + + return filename; +} + +int +sh_mktmpfd (nameroot, flags, namep) + char *nameroot; + int flags; + char **namep; +{ + char *filename, *tdir, *lroot; + int fd, tdlen; + + filename = (char *)xmalloc (PATH_MAX + 1); + tdir = get_tmpdir (flags); + tdlen = strlen (tdir); + + lroot = nameroot ? nameroot : DEFAULT_NAMEROOT; + +#ifdef USE_MKSTEMP + sprintf (filename, "%s/%s.XXXXXX", tdir, lroot); + fd = mkstemp (filename); + if (fd < 0 || namep == 0) + { + free (filename); + filename = NULL; + } + if (namep) + *namep = filename; + return fd; +#else /* !USE_MKSTEMP */ + do + { + filenum = (filenum << 1) ^ + (unsigned long) time ((time_t *)0) ^ + (unsigned long) dollar_dollar_pid ^ + (unsigned long) ((flags & MT_USERANDOM) ? get_random_number () : ntmpfiles++); + sprintf (filename, "%s/%s-%lu", tdir, lroot, filenum); + if (tmpnamelen > 0 && tmpnamelen < 32) + filename[tdlen + 1 + tmpnamelen] = '\0'; + fd = open (filename, BASEOPENFLAGS | ((flags & MT_READWRITE) ? O_RDWR : O_WRONLY), 0600); + } + while (fd < 0 && errno == EEXIST); + + if (namep) + *namep = filename; + else + free (filename); + + return fd; +#endif /* !USE_MKSTEMP */ +} + +FILE * +sh_mktmpfp (nameroot, flags, namep) + char *nameroot; + int flags; + char **namep; +{ + int fd; + FILE *fp; + + fd = sh_mktmpfd (nameroot, flags, namep); + if (fd < 0) + return ((FILE *)NULL); + fp = fdopen (fd, (flags & MT_READWRITE) ? "w+" : "w"); + if (fp == 0) + close (fd); + return fp; +} |