release/src/router/busybox/debianutils/mktemp.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini mktemp implementation for busybox
   4  *
   5  *
   6  * Copyright (C) 2000 by Daniel Jacobowitz
   7  * Written by Daniel Jacobowitz <dan@debian.org>
   8  *
   9  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  10  */
  11
  12 /* Coreutils 6.12 man page says:
  13  *        mktemp [OPTION]... [TEMPLATE]
  14  * Create a temporary file or directory, safely, and print its name. If
  15  * TEMPLATE is not specified, use tmp.XXXXXXXXXX.
  16  * -d, --directory
  17  *        create a directory, not a file
  18  * -q, --quiet
  19  *        suppress diagnostics about file/dir-creation failure
  20  * -u, --dry-run
  21  *        do not create anything; merely print a name (unsafe)
  22  * --tmpdir[=DIR]
  23  *        interpret TEMPLATE relative to DIR. If DIR is not specified,
  24  *        use  $TMPDIR if set, else /tmp.  With this option, TEMPLATE must
  25  *        not be an absolute name. Unlike with -t, TEMPLATE may contain
  26  *        slashes, but even here, mktemp still creates only the final com-
  27  *        ponent.
  28  * -p DIR use DIR as a prefix; implies -t [deprecated]
  29  * -t     interpret TEMPLATE as a single file name component, relative  to
  30  *        a  directory:  $TMPDIR, if set; else the directory specified via
  31  *        -p; else /tmp [deprecated]
  32  */
  33 //config:config MKTEMP
  34 //config:       bool "mktemp"
  35 //config:       default y
  36 //config:       help
  37 //config:         mktemp is used to create unique temporary files
  38
  39 //applet:IF_MKTEMP(APPLET(mktemp, BB_DIR_BIN, BB_SUID_DROP))
  40
  41 //kbuild:lib-$(CONFIG_MKTEMP) += mktemp.o
  42
  43 //usage:#define mktemp_trivial_usage
  44 //usage:       "[-dt] [-p DIR] [TEMPLATE]"
  45 //usage:#define mktemp_full_usage "\n\n"
  46 //usage:       "Create a temporary file with name based on TEMPLATE and print its name.\n"
  47 //usage:       "TEMPLATE must end with XXXXXX (e.g. [/dir/]nameXXXXXX).\n"
  48 //usage:       "Without TEMPLATE, -t tmp.XXXXXX is assumed.\n"
  49 //usage:     "\n        -d      Make directory, not file"
  50 //usage:     "\n        -q      Fail silently on errors"
  51 //usage:     "\n        -t      Prepend base directory name to TEMPLATE"
  52 //usage:     "\n        -p DIR  Use DIR as a base directory (implies -t)"
  53 //usage:     "\n        -u      Do not create anything; print a name"
  54 //usage:     "\n"
  55 //usage:     "\nBase directory is: -p DIR, else $TMPDIR, else /tmp"
  56 //usage:
  57 //usage:#define mktemp_example_usage
  58 //usage:       "$ mktemp /tmp/temp.XXXXXX\n"
  59 //usage:       "/tmp/temp.mWiLjM\n"
  60 //usage:       "$ ls -la /tmp/temp.mWiLjM\n"
  61 //usage:       "-rw-------    1 andersen andersen        0 Apr 25 17:10 /tmp/temp.mWiLjM\n"
  62
  63 #include "libbb.h"
  64
  65 int mktemp_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  66 int mktemp_main(int argc UNUSED_PARAM, char **argv)
  67 {
  68         const char *path;
  69         char *chp;
  70         unsigned opts;
  71         enum {
  72                 OPT_d = 1 << 0,
  73                 OPT_q = 1 << 1,
  74                 OPT_t = 1 << 2,
  75                 OPT_p = 1 << 3,
  76                 OPT_u = 1 << 4,
  77         };
  78
  79         path = getenv("TMPDIR");
  80         if (!path || path[0] == '\0')
  81                 path = "/tmp";
  82
  83         opt_complementary = "?1"; /* 1 argument max */
  84         opts = getopt32(argv, "dqtp:u", &path);
  85
  86         chp = argv[optind];
  87         if (!chp) {
  88                 /* GNU coreutils 8.4:
  89                  * bare "mktemp" -> "mktemp -t tmp.XXXXXX"
  90                  */
  91                 chp = xstrdup("tmp.XXXXXX");
  92                 opts |= OPT_t;
  93         }
  94 #if 0
  95         /* Don't allow directory separator in template */
  96         if ((opts & OPT_t) && bb_basename(chp) != chp) {
  97                 errno = EINVAL;
  98                 goto error;
  99         }
 100 #endif
 101         if (opts & (OPT_t|OPT_p))
 102                 chp = concat_path_file(path, chp);
 103
 104         if (opts & OPT_u) {
 105                 chp = mktemp(chp);
 106                 if (chp[0] == '\0')
 107                         goto error;
 108         } else if (opts & OPT_d) {
 109                 if (mkdtemp(chp) == NULL)
 110                         goto error;
 111         } else {
 112                 if (mkstemp(chp) < 0)
 113                         goto error;
 114         }
 115         puts(chp);
 116         return EXIT_SUCCESS;
 117  error:
 118         if (opts & OPT_q)
 119                 return EXIT_FAILURE;
 120         /* don't use chp as it gets mangled in case of error */
 121         bb_perror_nomsg_and_die();
 122 }