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1 /* Program name management.
2    Copyright (C) 2001-2003, 2005-2012 Free Software Foundation, Inc.
3    Written by Bruno Haible <bruno@clisp.org>, 2001.
4 
5    This program is free software: you can redistribute it and/or modify
6    it under the terms of the GNU General Public License as published by
7    the Free Software Foundation; either version 3 of the License, or
8    (at your option) any later version.
9 
10    This program 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
13    GNU General Public License for more details.
14 
15    You should have received a copy of the GNU General Public License
16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
17 
18 
19 #include <config.h>
20 
21 /* Specification.  */
22 #undef ENABLE_RELOCATABLE /* avoid defining set_program_name as a macro */
23 #include "progname.h"
24 
25 #include <errno.h> /* get program_invocation_name declaration */
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 
30 
31 /* String containing name the program is called with.
32    To be initialized by main().  */
33 const char *program_name = NULL;
34 
35 /* Set program_name, based on argv[0].
36    argv0 must be a string allocated with indefinite extent, and must not be
37    modified after this call.  */
38 void
set_program_name(const char * argv0)39 set_program_name (const char *argv0)
40 {
41   /* libtool creates a temporary executable whose name is sometimes prefixed
42      with "lt-" (depends on the platform).  It also makes argv[0] absolute.
43      But the name of the temporary executable is a detail that should not be
44      visible to the end user and to the test suite.
45      Remove this "<dirname>/.libs/" or "<dirname>/.libs/lt-" prefix here.  */
46   const char *slash;
47   const char *base;
48 
49   /* Sanity check.  POSIX requires the invoking process to pass a non-NULL
50      argv[0].  */
51   if (argv0 == NULL)
52     {
53       /* It's a bug in the invoking program.  Help diagnosing it.  */
54       fputs ("A NULL argv[0] was passed through an exec system call.\n",
55              stderr);
56       abort ();
57     }
58 
59   slash = strrchr (argv0, '/');
60   base = (slash != NULL ? slash + 1 : argv0);
61   if (base - argv0 >= 7 && strncmp (base - 7, "/.libs/", 7) == 0)
62     {
63       argv0 = base;
64       if (strncmp (base, "lt-", 3) == 0)
65         {
66           argv0 = base + 3;
67           /* On glibc systems, remove the "lt-" prefix from the variable
68              program_invocation_short_name.  */
69 #if HAVE_DECL_PROGRAM_INVOCATION_SHORT_NAME
70           program_invocation_short_name = (char *) argv0;
71 #endif
72         }
73     }
74 
75   /* But don't strip off a leading <dirname>/ in general, because when the user
76      runs
77          /some/hidden/place/bin/cp foo foo
78      he should get the error message
79          /some/hidden/place/bin/cp: `foo' and `foo' are the same file
80      not
81          cp: `foo' and `foo' are the same file
82    */
83 
84   program_name = argv0;
85 
86   /* On glibc systems, the error() function comes from libc and uses the
87      variable program_invocation_name, not program_name.  So set this variable
88      as well.  */
89 #if HAVE_DECL_PROGRAM_INVOCATION_NAME
90   program_invocation_name = (char *) argv0;
91 #endif
92 }
93