source: mainline/uspace/app/bdsh/cmds/modules/rm/rm.c@ 0328987

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 0328987 was 6afc9d7, checked in by Jiri Svoboda <jiri@…>, 10 years ago

UNIX-like I/O functions should use errno to return error code for many reasons.
  • Property mode set to 100644
File size: 7.4 KB
RevLine 
[36ab7c7]1/*
2 * Copyright (c) 2008 Tim Post
[216d6fc]3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
[36ab7c7]6 * modification, are permitted provided that the following conditions
7 * are met:
[216d6fc]8 *
[36ab7c7]9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
[216d6fc]16 *
[36ab7c7]17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
[216d6fc]27 */
28
[6afc9d7]29#include <errno.h>
[216d6fc]30#include <stdio.h>
31#include <stdlib.h>
32#include <unistd.h>
33#include <fcntl.h>
34#include <dirent.h>
35#include <getopt.h>
[3bf907a]36#include <mem.h>
[19f857a]37#include <str.h>
[216d6fc]38
39#include "config.h"
40#include "errors.h"
41#include "util.h"
42#include "entry.h"
43#include "rm.h"
44#include "cmds.h"
45
[a000878c]46static const char *cmdname = "rm";
[216d6fc]47#define RM_VERSION "0.0.1"
48
[3771a6e]49static struct option const long_options[] = {
[216d6fc]50 { "help", no_argument, 0, 'h' },
51 { "version", no_argument, 0, 'v' },
52 { "recursive", no_argument, 0, 'r' },
53 { "force", no_argument, 0, 'f' },
54 { "safe", no_argument, 0, 's' },
55 { 0, 0, 0, 0 }
56};
57
[081d60f]58/* Return values for rm_scope() */
59#define RM_BOGUS 0
60#define RM_FILE 1
61#define RM_DIR 2
62
63/* Flags for rm_update() */
64#define _RM_ENTRY 0
65#define _RM_ADVANCE 1
66#define _RM_REWIND 2
67#define _RM_EXIT 3
68
69/* A simple job structure */
70typedef struct {
71 /* Options set at run time */
72 unsigned int force; /* -f option */
73 unsigned int recursive; /* -r option */
74 unsigned int safe; /* -s option */
75
76 /* Keeps track of the job in progress */
77 int advance; /* How far deep we've gone since entering */
78 DIR *entry; /* Entry point to the tree being removed */
79 char *owd; /* Where we were when we invoked rm */
80 char *cwd; /* Current directory being transversed */
81 char *nwd; /* Next directory to be transversed */
82
83 /* Counters */
84 int f_removed; /* Number of files unlinked */
85 int d_removed; /* Number of directories unlinked */
86} rm_job_t;
87
88static rm_job_t rm;
89
90static unsigned int rm_recursive(const char *);
91
[b510d52]92static unsigned int rm_start(rm_job_t *rm)
[216d6fc]93{
94 rm->recursive = 0;
95 rm->force = 0;
96 rm->safe = 0;
97
98 /* Make sure we can allocate enough memory to store
99 * what is needed in the job structure */
100 if (NULL == (rm->nwd = (char *) malloc(PATH_MAX)))
101 return 0;
[445e7c0]102 memset(rm->nwd, 0, PATH_MAX);
[216d6fc]103
104 if (NULL == (rm->owd = (char *) malloc(PATH_MAX)))
105 return 0;
[445e7c0]106 memset(rm->owd, 0, PATH_MAX);
[216d6fc]107
108 if (NULL == (rm->cwd = (char *) malloc(PATH_MAX)))
109 return 0;
[445e7c0]110 memset(rm->cwd, 0, PATH_MAX);
[216d6fc]111
112 chdir(".");
113
114 if (NULL == (getcwd(rm->owd, PATH_MAX)))
115 return 0;
116
117 return 1;
118}
119
[b510d52]120static void rm_end(rm_job_t *rm)
[216d6fc]121{
122 if (NULL != rm->nwd)
123 free(rm->nwd);
124
125 if (NULL != rm->owd)
126 free(rm->owd);
127
128 if (NULL != rm->cwd)
129 free(rm->cwd);
130}
131
[081d60f]132static unsigned int rm_single(const char *path)
133{
[6afc9d7]134 if (unlink(path) != 0) {
[081d60f]135 cli_error(CL_EFAIL, "rm: could not remove file %s", path);
136 return 1;
137 }
138 return 0;
139}
140
141static unsigned int rm_scope(const char *path)
142{
143 int fd;
144 DIR *dirp;
145
146 dirp = opendir(path);
147 if (dirp) {
148 closedir(dirp);
149 return RM_DIR;
150 }
151
152 fd = open(path, O_RDONLY);
[6afc9d7]153 if (fd >= 0) {
[081d60f]154 close(fd);
155 return RM_FILE;
156 }
157
158 return RM_BOGUS;
159}
160
[ed2c8ff]161static unsigned int rm_recursive_not_empty_dirs(const char *path)
162{
163 DIR *dirp;
164 struct dirent *dp;
165 char buff[PATH_MAX];
166 unsigned int scope;
167 unsigned int ret = 0;
168
169 dirp = opendir(path);
170 if (!dirp) {
171 /* May have been deleted between scoping it and opening it */
172 cli_error(CL_EFAIL, "Could not open %s", path);
173 return ret;
174 }
175
176 memset(buff, 0, sizeof(buff));
177 while ((dp = readdir(dirp))) {
178 snprintf(buff, PATH_MAX - 1, "%s/%s", path, dp->d_name);
179 scope = rm_scope(buff);
180 switch (scope) {
181 case RM_BOGUS:
182 break;
183 case RM_FILE:
184 ret += rm_single(buff);
185 break;
186 case RM_DIR:
187 ret += rm_recursive(buff);
188 break;
189 }
190 }
[713ea96a]191
192 closedir(dirp);
[ed2c8ff]193
194 return ret;
195}
196
[b510d52]197static unsigned int rm_recursive(const char *path)
[216d6fc]198{
199 int rc;
[ed2c8ff]200 unsigned int ret = 0;
[216d6fc]201
202 /* First see if it will just go away */
203 rc = rmdir(path);
204 if (rc == 0)
205 return 0;
206
207 /* Its not empty, recursively scan it */
[ed2c8ff]208 ret = rm_recursive_not_empty_dirs(path);
209
210 /* Delete directory */
211 rc = rmdir(path);
212 if (rc == 0)
[6afc9d7]213 return errno;
[ed2c8ff]214
215 cli_error(CL_ENOTSUP, "Can not remove %s", path);
216
217 return ret + 1;
[216d6fc]218}
219
220/* Dispays help for rm in various levels */
[809813d]221void help_cmd_rm(unsigned int level)
[216d6fc]222{
223 if (level == HELP_SHORT) {
224 printf("`%s' removes files and directories.\n", cmdname);
225 } else {
226 help_cmd_rm(HELP_SHORT);
227 printf(
228 "Usage: %s [options] <path>\n"
229 "Options:\n"
230 " -h, --help A short option summary\n"
231 " -v, --version Print version information and exit\n"
232 " -r, --recursive Recursively remove sub directories\n"
233 " -f, --force Do not prompt prior to removing files\n"
234 " -s, --safe Stop if directories change during removal\n\n"
235 "Currently, %s is under development, some options don't work.\n",
236 cmdname, cmdname);
237 }
[809813d]238 return;
[216d6fc]239}
240
241/* Main entry point for rm, accepts an array of arguments */
[809813d]242int cmd_rm(char **argv)
[216d6fc]243{
244 unsigned int argc;
245 unsigned int i, scope, ret = 0;
246 int c, opt_ind;
247 size_t len;
248 char *buff = NULL;
249
[43e02a6]250 argc = cli_count_args(argv);
251
[216d6fc]252 if (argc < 2) {
253 cli_error(CL_EFAIL,
254 "%s: insufficient arguments. Try %s --help", cmdname, cmdname);
255 return CMD_FAILURE;
256 }
257
258 if (!rm_start(&rm)) {
259 cli_error(CL_ENOMEM, "%s: could not initialize", cmdname);
260 rm_end(&rm);
261 return CMD_FAILURE;
262 }
263
[86cf96d]264 for (c = 0, optreset = 1, optind = 0, opt_ind = 0; c != -1;) {
[216d6fc]265 c = getopt_long(argc, argv, "hvrfs", long_options, &opt_ind);
266 switch (c) {
267 case 'h':
268 help_cmd_rm(HELP_LONG);
269 return CMD_SUCCESS;
270 case 'v':
271 printf("%s\n", RM_VERSION);
272 return CMD_SUCCESS;
273 case 'r':
274 rm.recursive = 1;
275 break;
276 case 'f':
277 rm.force = 1;
278 break;
279 case 's':
280 rm.safe = 1;
281 break;
282 }
283 }
284
[5b3cf90]285 if ((unsigned) optind == argc) {
[216d6fc]286 cli_error(CL_EFAIL,
287 "%s: insufficient arguments. Try %s --help", cmdname, cmdname);
288 rm_end(&rm);
289 return CMD_FAILURE;
290 }
291
292 i = optind;
293 while (NULL != argv[i]) {
[92fd52d7]294 len = str_size(argv[i]) + 2;
[216d6fc]295 buff = (char *) realloc(buff, len);
[b7be230]296 if (buff == NULL) {
297 printf("rm: out of memory\n");
298 ret = 1;
299 break;
300 }
[445e7c0]301 memset(buff, 0, len);
[afe1d1e]302 snprintf(buff, len, "%s", argv[i]);
[216d6fc]303
304 scope = rm_scope(buff);
305 switch (scope) {
306 case RM_BOGUS: /* FIXME */
307 case RM_FILE:
308 ret += rm_single(buff);
309 break;
310 case RM_DIR:
311 if (! rm.recursive) {
312 printf("%s is a directory, use -r to remove it.\n", buff);
313 ret ++;
314 } else {
315 ret += rm_recursive(buff);
316 }
317 break;
318 }
319 i++;
320 }
321
322 if (NULL != buff)
323 free(buff);
324
325 rm_end(&rm);
326
327 if (ret)
328 return CMD_FAILURE;
329 else
330 return CMD_SUCCESS;
331}
332
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