1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
/*
* libexplain - Explain errno values returned by libc functions
* Copyright (C) 2008-2011 Peter Miller
* Written by Peter Miller <pmiller@opensource.org.au>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 3 of the
* License, or (at your option) any later version.
*
* This program 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libexplain/ac/limits.h> /* for PATH_MAX except Solaris */
#include <libexplain/ac/stdlib.h>
#include <libexplain/ac/string.h>
#include <libexplain/ac/sys/param.h> /* for PATH_MAX except Solaris */
#include <libexplain/fileinfo.h>
#include <libexplain/name_max.h>
#include <libexplain/program_name.h>
static char progname[NAME_MAX + 1];
static void
explain_program_name_set_real(const char *name)
{
const char *cp;
if (!name)
name = "";
progname[0] = '\0';
if (!name)
return;
cp = name;
for (;;)
{
char *pnp;
if (*cp == '/')
{
/*
* Weird but true: some Unix implementations allow trailing
* slahses on command names. Ugh. Not POSIX conforming, either.
*/
++cp;
continue;
}
if (*cp == '\0')
break;
/*
* GNU Libtool makes intermediate binaries with "lt-" prefixes,
* ignore them when we see them.
*/
if (0 == memcmp(cp, "lt-", 3))
cp += 3;
pnp = progname;
for (;;)
{
if (pnp < progname + sizeof(progname) - 1)
*pnp++ = *cp;
++cp;
if (*cp == '\0' || *cp == '/')
break;
}
*pnp = '\0';
}
}
const char *
explain_program_name_get(void)
{
/*
* Use the cached result, if possible.
*/
if (progname[0])
return progname;
/*
* See if /proc can help us.
*/
{
char path[PATH_MAX + 1];
if (explain_fileinfo_self_exe(path, sizeof(path)))
{
explain_program_name_set_real(path);
if (progname[0])
return progname;
}
}
/*
* bash(1) sets the "_" environment variable,
* use that if available.
*/
{
const char *path;
path = getenv("_");
if (path && *path)
{
explain_program_name_set_real(path);
if (progname[0])
return progname;
}
}
/*
* Sorry, can't help you.
*/
return "";
}
void
explain_program_name_set(const char *name)
{
explain_program_name_set_real(name);
if (!progname[0])
explain_program_name_assemble(0);
}
|
