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nsxivutil.c

293 lines · 5.9 KB · C

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1/* Copyright 2011-2020 Bert Muennich
2 * Copyright 2021-2022 nsxiv contributors
3 *
4 * This file is a part of nsxiv.
5 *
6 * nsxiv is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published
8 * by the Free Software Foundation; either version 2 of the License,
9 * or (at your option) any later version.
10 *
11 * nsxiv is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with nsxiv. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20#include "nsxiv.h"
21
22#include <assert.h>
23#include <errno.h>
24#include <stdarg.h>
25#include <stdio.h>
26#include <stdlib.h>
27#include <string.h>
28#include <sys/stat.h>
29#include <unistd.h>
30
31const char *progname;
32
33void* emalloc(size_t size)
34{
35 void *ptr;
36
37 ptr = malloc(size);
38 if (ptr == NULL)
39 error(EXIT_FAILURE, errno, NULL);
40 return ptr;
41}
42
43void* ecalloc(size_t nmemb, size_t size)
44{
45 void *ptr;
46
47 ptr = calloc(nmemb, size);
48 if (ptr == NULL)
49 error(EXIT_FAILURE, errno, NULL);
50 return ptr;
51}
52
53void* erealloc(void *ptr, size_t size)
54{
55 ptr = realloc(ptr, size);
56 if (ptr == NULL)
57 error(EXIT_FAILURE, errno, NULL);
58 return ptr;
59}
60
61char* estrdup(const char *s)
62{
63 char *d;
64 size_t n = strlen(s) + 1;
65
66 d = malloc(n);
67 if (d == NULL)
68 error(EXIT_FAILURE, errno, NULL);
69 memcpy(d, s, n);
70 return d;
71}
72
73void error(int eval, int err, const char* fmt, ...)
74{
75 va_list ap;
76
77 if (eval == 0 && options->quiet)
78 return;
79
80 fflush(stdout);
81 fprintf(stderr, "%s: ", progname);
82 va_start(ap, fmt);
83 if (fmt != NULL)
84 vfprintf(stderr, fmt, ap);
85 va_end(ap);
86 if (err != 0)
87 fprintf(stderr, "%s%s", fmt != NULL ? ": " : "", strerror(err));
88 fputc('\n', stderr);
89
90 if (eval != 0)
91 exit(eval);
92}
93
94int r_opendir(r_dir_t *rdir, const char *dirname, bool recursive)
95{
96 if (*dirname == '\0')
97 return -1;
98
99 if ((rdir->dir = opendir(dirname)) == NULL) {
100 rdir->name = NULL;
101 rdir->stack = NULL;
102 return -1;
103 }
104
105 rdir->stcap = 512;
106 rdir->stack = emalloc(rdir->stcap * sizeof(char*));
107 rdir->stlen = 0;
108
109 rdir->name = (char*) dirname;
110 rdir->d = 0;
111 rdir->recursive = recursive;
112
113 return 0;
114}
115
116int r_closedir(r_dir_t *rdir)
117{
118 int ret = 0;
119
120 if (rdir->stack != NULL) {
121 while (rdir->stlen > 0)
122 free(rdir->stack[--rdir->stlen]);
123 free(rdir->stack);
124 rdir->stack = NULL;
125 }
126
127 if (rdir->dir != NULL) {
128 if ((ret = closedir(rdir->dir)) == 0)
129 rdir->dir = NULL;
130 }
131
132 if (rdir->d != 0) {
133 free(rdir->name);
134 rdir->name = NULL;
135 }
136
137 return ret;
138}
139
140char* r_readdir(r_dir_t *rdir, bool skip_dotfiles)
141{
142 size_t len;
143 char *filename;
144 struct dirent *dentry;
145 struct stat fstats;
146
147 while (true) {
148 if (rdir->dir != NULL && (dentry = readdir(rdir->dir)) != NULL) {
149 if (dentry->d_name[0] == '.') {
150 if (skip_dotfiles)
151 continue;
152 if (dentry->d_name[1] == '\0')
153 continue;
154 if (dentry->d_name[1] == '.' && dentry->d_name[2] == '\0')
155 continue;
156 }
157
158 len = strlen(rdir->name) + strlen(dentry->d_name) + 2;
159 filename = emalloc(len);
160 snprintf(filename, len, "%s%s%s", rdir->name,
161 rdir->name[strlen(rdir->name)-1] == '/' ? "" : "/",
162 dentry->d_name);
163
164 if (stat(filename, &fstats) < 0) {
165 free(filename);
166 continue;
167 }
168 if (S_ISDIR(fstats.st_mode)) {
169 /* put subdirectory on the stack */
170 if (rdir->stlen == rdir->stcap) {
171 rdir->stcap *= 2;
172 rdir->stack = erealloc(rdir->stack,
173 rdir->stcap * sizeof(char*));
174 }
175 rdir->stack[rdir->stlen++] = filename;
176 continue;
177 }
178 return filename;
179 }
180
181 if (rdir->recursive && rdir->stlen > 0) {
182 /* open next subdirectory */
183 assert(rdir->dir != NULL);
184 closedir(rdir->dir);
185 if (rdir->d != 0)
186 free(rdir->name);
187 rdir->name = rdir->stack[--rdir->stlen];
188 rdir->d = 1;
189 if ((rdir->dir = opendir(rdir->name)) == NULL)
190 error(0, errno, "%s", rdir->name);
191 continue;
192 }
193 /* no more entries */
194 break;
195 }
196 return NULL;
197}
198
199int r_mkdir(char *path)
200{
201 int rc = 0;
202 char c, *s = path;
203 struct stat st;
204
205 while (*s != '\0' && rc == 0) {
206 if (*s == '/') {
207 s++;
208 continue;
209 }
210 for (; *s != '\0' && *s != '/'; s++);
211 c = *s;
212 *s = '\0';
213 if (mkdir(path, 0755) == -1) {
214 if (errno != EEXIST || stat(path, &st) == -1 || !S_ISDIR(st.st_mode)) {
215 error(0, errno, "%s", path);
216 rc = -1;
217 }
218 }
219 *s = c;
220 }
221 return rc;
222}
223
224void construct_argv(char **argv, unsigned int len, ...)
225{
226 unsigned int i;
227 va_list args;
228
229 va_start(args, len);
230 for (i = 0; i < len; ++i)
231 argv[i] = va_arg(args, char *);
232 va_end(args);
233 if (argv[len-1] != NULL)
234 error(EXIT_FAILURE, 0, "argv not NULL terminated");
235}
236
237spawn_t spawn(const char *cmd, char *const argv[], unsigned int flags)
238{
239 pid_t pid;
240 spawn_t status = { -1, -1, -1 };
241 int pfd_read[2] = { -1, -1 }, pfd_write[2] = { -1, -1 };
242 const bool r = flags & X_READ;
243 const bool w = flags & X_WRITE;
244
245 if (cmd == NULL || argv == NULL || flags == 0)
246 return status;
247
248 if (r && pipe(pfd_read) < 0) {
249 error(0, errno, "pipe: %s", cmd);
250 return status;
251 }
252
253 if (w && pipe(pfd_write) < 0) {
254 error(0, errno, "pipe: %s", cmd);
255 if (r) {
256 close(pfd_read[0]);
257 close(pfd_read[1]);
258 }
259 return status;
260 }
261
262 if ((pid = fork()) == 0) { /* in child */
263 if ((r && dup2(pfd_read[1], 1) < 0) || (w && dup2(pfd_write[0], 0) < 0))
264 error(EXIT_FAILURE, errno, "dup2: %s", cmd);
265
266 if (r) {
267 close(pfd_read[0]);
268 close(pfd_read[1]);
269 }
270 if (w) {
271 close(pfd_write[0]);
272 close(pfd_write[1]);
273 }
274 execv(cmd, argv);
275 error(EXIT_FAILURE, errno, "exec: %s", cmd);
276 } else if (pid < 0) { /* fork failed */
277 error(0, errno, "fork: %s", cmd);
278 if (r)
279 close(pfd_read[0]);
280 if (w)
281 close(pfd_write[1]);
282 } else { /* in parent */
283 status.pid = pid;
284 status.readfd = pfd_read[0];
285 status.writefd = pfd_write[1];
286 }
287
288 if (r)
289 close(pfd_read[1]);
290 if (w)
291 close(pfd_write[0]);
292 return status;
293}