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81b86775 DG |
1 | /* |
2 | * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License, version 2 only, as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
15 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | */ | |
17 | ||
18 | #define _GNU_SOURCE | |
19 | #include <ctype.h> | |
20 | #include <fcntl.h> | |
21 | #include <limits.h> | |
22 | #include <stdlib.h> | |
23 | #include <string.h> | |
24 | ||
25 | #include <common/common.h> | |
26 | ||
27 | #include "utils.h" | |
28 | ||
29 | /* | |
30 | * Return the realpath(3) of the path even if the last directory token does not | |
31 | * exist. For example, with /tmp/test1/test2, if test2/ does not exist but the | |
32 | * /tmp/test1 does, the real path is returned. In normal time, realpath(3) | |
33 | * fails if the end point directory does not exist. | |
34 | */ | |
35 | char *utils_expand_path(const char *path) | |
36 | { | |
37 | const char *end_path = path; | |
38 | char *next, *cut_path = NULL, *expanded_path = NULL; | |
39 | ||
40 | /* Safety net */ | |
41 | if (path == NULL) { | |
42 | goto error; | |
43 | } | |
44 | ||
45 | /* Find last token delimited by '/' */ | |
46 | while ((next = strpbrk(end_path + 1, "/"))) { | |
47 | end_path = next; | |
48 | } | |
49 | ||
50 | /* Cut last token from original path */ | |
51 | cut_path = strndup(path, end_path - path); | |
52 | ||
53 | expanded_path = zmalloc(PATH_MAX); | |
54 | if (expanded_path == NULL) { | |
55 | PERROR("zmalloc expand path"); | |
56 | goto error; | |
57 | } | |
58 | ||
59 | expanded_path = realpath((char *)cut_path, expanded_path); | |
60 | if (expanded_path == NULL) { | |
61 | switch (errno) { | |
62 | case ENOENT: | |
63 | ERR("%s: No such file or directory", cut_path); | |
64 | break; | |
65 | default: | |
66 | PERROR("realpath utils expand path"); | |
67 | break; | |
68 | } | |
69 | goto error; | |
70 | } | |
71 | ||
72 | /* Add end part to expanded path */ | |
73 | strncat(expanded_path, end_path, PATH_MAX); | |
74 | ||
75 | free(cut_path); | |
76 | return expanded_path; | |
77 | ||
78 | error: | |
79 | free(expanded_path); | |
80 | free(cut_path); | |
81 | return NULL; | |
82 | } | |
83 | ||
84 | /* | |
85 | * Create a pipe in dst. | |
86 | */ | |
87 | int utils_create_pipe(int *dst) | |
88 | { | |
89 | int ret; | |
90 | ||
91 | if (dst == NULL) { | |
92 | return -1; | |
93 | } | |
94 | ||
95 | ret = pipe(dst); | |
96 | if (ret < 0) { | |
97 | PERROR("create pipe"); | |
98 | } | |
99 | ||
100 | return ret; | |
101 | } | |
102 | ||
103 | /* | |
104 | * Create pipe and set CLOEXEC flag to both fd. | |
105 | * | |
106 | * Make sure the pipe opened by this function are closed at some point. Use | |
107 | * utils_close_pipe(). | |
108 | */ | |
109 | int utils_create_pipe_cloexec(int *dst) | |
110 | { | |
111 | int ret, i; | |
112 | ||
113 | if (dst == NULL) { | |
114 | return -1; | |
115 | } | |
116 | ||
117 | ret = utils_create_pipe(dst); | |
118 | if (ret < 0) { | |
119 | goto error; | |
120 | } | |
121 | ||
122 | for (i = 0; i < 2; i++) { | |
123 | ret = fcntl(dst[i], F_SETFD, FD_CLOEXEC); | |
124 | if (ret < 0) { | |
125 | PERROR("fcntl pipe cloexec"); | |
126 | goto error; | |
127 | } | |
128 | } | |
129 | ||
130 | error: | |
131 | return ret; | |
132 | } | |
133 | ||
134 | /* | |
135 | * Close both read and write side of the pipe. | |
136 | */ | |
137 | void utils_close_pipe(int *src) | |
138 | { | |
139 | int i, ret; | |
140 | ||
141 | if (src == NULL) { | |
142 | return; | |
143 | } | |
144 | ||
145 | for (i = 0; i < 2; i++) { | |
146 | /* Safety check */ | |
147 | if (src[i] < 0) { | |
148 | continue; | |
149 | } | |
150 | ||
151 | ret = close(src[i]); | |
152 | if (ret) { | |
153 | PERROR("close pipe"); | |
154 | } | |
155 | } | |
156 | } | |
a4b92340 DG |
157 | |
158 | /* | |
159 | * Create a new string using two strings range. | |
160 | */ | |
161 | char *utils_strdupdelim(const char *begin, const char *end) | |
162 | { | |
163 | char *str; | |
164 | ||
165 | str = zmalloc(end - begin + 1); | |
166 | if (str == NULL) { | |
167 | PERROR("zmalloc strdupdelim"); | |
168 | goto error; | |
169 | } | |
170 | ||
171 | memcpy(str, begin, end - begin); | |
172 | str[end - begin] = '\0'; | |
173 | ||
174 | error: | |
175 | return str; | |
176 | } |