OpenCores
URL https://opencores.org/ocsvn/openrisc_me/openrisc_me/trunk

Subversion Repositories openrisc_me

[/] [openrisc/] [trunk/] [gnu-src/] [binutils-2.18.50/] [libiberty/] [make-temp-file.c] - Blame information for rev 156

Details | Compare with Previous | View Log

Line No. Rev Author Line
1 38 julius
/* Utility to pick a temporary filename prefix.
2
   Copyright (C) 1996, 1997, 1998, 2001 Free Software Foundation, Inc.
3
 
4
This file is part of the libiberty library.
5
Libiberty is free software; you can redistribute it and/or
6
modify it under the terms of the GNU Library General Public
7
License as published by the Free Software Foundation; either
8
version 2 of the License, or (at your option) any later version.
9
 
10
Libiberty is distributed in the hope that it will be useful,
11
but WITHOUT ANY WARRANTY; without even the implied warranty of
12
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13
Library General Public License for more details.
14
 
15
You should have received a copy of the GNU Library General Public
16
License along with libiberty; see the file COPYING.LIB.  If not,
17
write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
18
Boston, MA 02110-1301, USA.  */
19
 
20
#ifdef HAVE_CONFIG_H
21
#include "config.h"
22
#endif
23
 
24
#include <stdio.h>      /* May get P_tmpdir.  */
25
#include <sys/types.h>
26
#ifdef HAVE_UNISTD_H
27
#include <unistd.h>
28
#endif
29
#ifdef HAVE_STDLIB_H
30
#include <stdlib.h>
31
#endif
32
#ifdef HAVE_STRING_H
33
#include <string.h>
34
#endif
35
#ifdef HAVE_SYS_FILE_H
36
#include <sys/file.h>   /* May get R_OK, etc. on some systems.  */
37
#endif
38
 
39
#ifndef R_OK
40
#define R_OK 4
41
#define W_OK 2
42
#define X_OK 1
43
#endif
44
 
45
#include "libiberty.h"
46
extern int mkstemps (char *, int);
47
 
48
/* '/' works just fine on MS-DOS based systems.  */
49
#ifndef DIR_SEPARATOR
50
#define DIR_SEPARATOR '/'
51
#endif
52
 
53
/* Name of temporary file.
54
   mktemp requires 6 trailing X's.  */
55
#define TEMP_FILE "ccXXXXXX"
56
#define TEMP_FILE_LEN (sizeof(TEMP_FILE) - 1)
57
 
58
/* Subroutine of choose_tmpdir.
59
   If BASE is non-NULL, return it.
60
   Otherwise it checks if DIR is a usable directory.
61
   If success, DIR is returned.
62
   Otherwise NULL is returned.  */
63
 
64
static inline const char *try_dir (const char *, const char *);
65
 
66
static inline const char *
67
try_dir (const char *dir, const char *base)
68
{
69
  if (base != 0)
70
    return base;
71
  if (dir != 0
72
      && access (dir, R_OK | W_OK | X_OK) == 0)
73
    return dir;
74
  return 0;
75
}
76
 
77
static const char tmp[] = { DIR_SEPARATOR, 't', 'm', 'p', 0 };
78
static const char usrtmp[] =
79
{ DIR_SEPARATOR, 'u', 's', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 };
80
static const char vartmp[] =
81
{ DIR_SEPARATOR, 'v', 'a', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 };
82
 
83
static char *memoized_tmpdir;
84
 
85
/*
86
 
87
@deftypefn Replacement char* choose_tmpdir ()
88
 
89
Returns a pointer to a directory path suitable for creating temporary
90
files in.
91
 
92
@end deftypefn
93
 
94
*/
95
 
96
char *
97
choose_tmpdir (void)
98
{
99
  const char *base = 0;
100
  char *tmpdir;
101
  unsigned int len;
102
 
103
  if (memoized_tmpdir)
104
    return memoized_tmpdir;
105
 
106
  base = try_dir (getenv ("TMPDIR"), base);
107
  base = try_dir (getenv ("TMP"), base);
108
  base = try_dir (getenv ("TEMP"), base);
109
 
110
#ifdef P_tmpdir
111
  base = try_dir (P_tmpdir, base);
112
#endif
113
 
114
  /* Try /var/tmp, /usr/tmp, then /tmp.  */
115
  base = try_dir (vartmp, base);
116
  base = try_dir (usrtmp, base);
117
  base = try_dir (tmp, base);
118
 
119
  /* If all else fails, use the current directory!  */
120
  if (base == 0)
121
    base = ".";
122
 
123
  /* Append DIR_SEPARATOR to the directory we've chosen
124
     and return it.  */
125
  len = strlen (base);
126
  tmpdir = XNEWVEC (char, len + 2);
127
  strcpy (tmpdir, base);
128
  tmpdir[len] = DIR_SEPARATOR;
129
  tmpdir[len+1] = '\0';
130
 
131
  memoized_tmpdir = tmpdir;
132
  return tmpdir;
133
}
134
 
135
/*
136
 
137
@deftypefn Replacement char* make_temp_file (const char *@var{suffix})
138
 
139
Return a temporary file name (as a string) or @code{NULL} if unable to
140
create one.  @var{suffix} is a suffix to append to the file name.  The
141
string is @code{malloc}ed, and the temporary file has been created.
142
 
143
@end deftypefn
144
 
145
*/
146
 
147
char *
148
make_temp_file (const char *suffix)
149
{
150
  const char *base = choose_tmpdir ();
151
  char *temp_filename;
152
  int base_len, suffix_len;
153
  int fd;
154
 
155
  if (suffix == 0)
156
    suffix = "";
157
 
158
  base_len = strlen (base);
159
  suffix_len = strlen (suffix);
160
 
161
  temp_filename = XNEWVEC (char, base_len
162
                           + TEMP_FILE_LEN
163
                           + suffix_len + 1);
164
  strcpy (temp_filename, base);
165
  strcpy (temp_filename + base_len, TEMP_FILE);
166
  strcpy (temp_filename + base_len + TEMP_FILE_LEN, suffix);
167
 
168
  fd = mkstemps (temp_filename, suffix_len);
169
  /* If mkstemps failed, then something bad is happening.  Maybe we should
170
     issue a message about a possible security attack in progress?  */
171
  if (fd == -1)
172
    abort ();
173
  /* Similarly if we can not close the file.  */
174
  if (close (fd))
175
    abort ();
176
  return temp_filename;
177
}

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.