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
|
/*
tildexpand.c
Author: Tatu Ylonen <ylo@cs.hut.fi>
Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
All rights reserved
Created: Wed Jul 12 01:07:36 1995 ylo
*/
/*
* $Id: tildexpand.c,v 1.2 1995/07/13 01:41:03 ylo Exp $
* $Log: tildexpand.c,v $
* Revision 1.2 1995/07/13 01:41:03 ylo
* Removed "Last modified" header.
* Added cvs log.
*
* $Endlog$
*/
#include <sys/types.h>
#include <string.h>
#include <pwd.h>
#include <assert.h>
#include <stdio.h>
void fatal(char *msg)
{
fprintf(stderr, "%s\n", msg);
exit(-1);
}
char *tilde_expand_filename(const char *filename, uid_t my_uid)
{
const char *cp;
unsigned int userlen;
char *expanded;
struct passwd *pw;
char user[100];
const char *homedir;
/* Return immediately if no tilde. */
if (filename[0] != '~')
return strdup(filename); /* x */
/* Skiop the tilde. */
filename++;
/* Find where the username ends. */
cp = strchr(filename, '/');
if (cp)
userlen = cp - filename; /* Have something after username. */
else
userlen = strlen(filename); /* Nothign after username. */
if (userlen == 0)
pw = getpwuid(my_uid); /* Own home directory. */
else
{
/* Tilde refers to someone elses home directory. */
if (userlen > sizeof(user) - 1)
fatal("User name after tilde too long.");
memcpy(user, filename, userlen);
user[userlen] = 0;
pw = getpwnam(user);
}
/* Check that we found the user. */
if (!pw)
fatal(strcat("Unknown user %100s.", user));
homedir = pw->pw_dir;
/* If referring to someones home directory, return it now. */
if (!cp)
{ /* Only home directory specified */
return strdup(homedir); /* x */
}
/* Build a path combining the specified directory and path. */
expanded = (char *)malloc(strlen(homedir) + strlen(cp + 1) + 2);
assert(expanded);
sprintf(expanded, "%s/%s", homedir, cp + 1);
return expanded;
}
|
