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
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
/*++
/* NAME
/* sane_basename 3
/* SUMMARY
/* split pathname into last component and parent directory
/* SYNOPSIS
/* #include <stringops.h>
/*
/* char *sane_basename(buf, path)
/* VSTRING *buf;
/* const char *path;
/*
/* char *sane_dirname(buf, path)
/* VSTRING *buf;
/* const char *path;
/* DESCRIPTION
/* These functions split a pathname into its last component
/* and its parent directory, excluding any trailing "/"
/* characters from the input. The result is a pointer to "/"
/* when the input is all "/" characters, or a pointer to "."
/* when the input is a null pointer or zero-length string.
/*
/* sane_basename() and sane_dirname() differ as follows
/* from standard basename() and dirname() implementations:
/* .IP \(bu
/* They can use caller-provided storage or private storage.
/* .IP \(bu
/* They never modify their input.
/* .PP
/* sane_basename() returns a pointer to string with the last
/* pathname component.
/*
/* sane_dirname() returns a pointer to string with the parent
/* directory. The result is a pointer to "." when the input
/* contains no '/' character.
/*
/* Arguments:
/* .IP buf
/* Result storage. If a null pointer is specified, each function
/* uses its own private memory that is overwritten upon each call.
/* .IP path
/* The input pathname.
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this
/* software.
/* AUTHOR(S)
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*--*/
/* System library. */
#include <sys_defs.h>
#include <string.h>
/* Utility library. */
#include <vstring.h>
#include <stringops.h>
#define STR(x) vstring_str(x)
/* sane_basename - skip directory prefix */
char *sane_basename(VSTRING *bp, const char *path)
{
static VSTRING *buf;
const char *first;
const char *last;
/*
* Your buffer or mine?
*/
if (bp == 0) {
bp = buf;
if (bp == 0)
bp = buf = vstring_alloc(10);
}
/*
* Special case: return "." for null or zero-length input.
*/
if (path == 0 || *path == 0)
return (STR(vstring_strcpy(bp, ".")));
/*
* Remove trailing '/' characters from input. Return "/" if input is all
* '/' characters.
*/
last = path + strlen(path) - 1;
while (*last == '/') {
if (last == path)
return (STR(vstring_strcpy(bp, "/")));
last--;
}
/*
* The pathname does not end in '/'. Skip to last '/' character if any.
*/
first = last - 1;
while (first >= path && *first != '/')
first--;
return (STR(vstring_strncpy(bp, first + 1, last - first)));
}
/* sane_dirname - keep directory prefix */
char *sane_dirname(VSTRING *bp, const char *path)
{
static VSTRING *buf;
const char *last;
/*
* Your buffer or mine?
*/
if (bp == 0) {
bp = buf;
if (bp == 0)
bp = buf = vstring_alloc(10);
}
/*
* Special case: return "." for null or zero-length input.
*/
if (path == 0 || *path == 0)
return (STR(vstring_strcpy(bp, ".")));
/*
* Remove trailing '/' characters from input. Return "/" if input is all
* '/' characters.
*/
last = path + strlen(path) - 1;
while (*last == '/') {
if (last == path)
return (STR(vstring_strcpy(bp, "/")));
last--;
}
/*
* This pathname does not end in '/'. Skip to last '/' character if any.
*/
while (last >= path && *last != '/')
last--;
if (last < path) /* no '/' */
return (STR(vstring_strcpy(bp, ".")));
/*
* Strip trailing '/' characters from dirname (not strictly needed).
*/
while (last > path && *last == '/')
last--;
return (STR(vstring_strncpy(bp, path, last - path + 1)));
}
#ifdef TEST
#include <vstring_vstream.h>
int main(int argc, char **argv)
{
VSTRING *buf = vstring_alloc(10);
char *dir;
char *base;
while (vstring_get_nonl(buf, VSTREAM_IN) > 0) {
dir = sane_dirname((VSTRING *) 0, STR(buf));
base = sane_basename((VSTRING *) 0, STR(buf));
vstream_printf("input=\"%s\" dir=\"%s\" base=\"%s\"\n",
STR(buf), dir, base);
}
vstream_fflush(VSTREAM_OUT);
vstring_free(buf);
return (0);
}
#endif
|
