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nsxivutil.c

236 lines · 4.6 KB · C

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1/* sxiv: util.c
2 * Copyright (c) 2011 Bert Muennich <muennich at informatik.hu-berlin.de>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19#include <stdlib.h>
20#include <string.h>
21#include <sys/types.h>
22#include <sys/stat.h>
23#include <unistd.h>
24#include <errno.h>
25
26#include "options.h"
27#include "util.h"
28
29#define FNAME_LEN 1024
30
31void cleanup();
32
33void* s_malloc(size_t size) {
34 void *ptr;
35
36 if (!(ptr = malloc(size)))
37 die("could not allocate memory");
38 return ptr;
39}
40
41void* s_realloc(void *ptr, size_t size) {
42 if (!(ptr = realloc(ptr, size)))
43 die("could not allocate memory");
44 return ptr;
45}
46
47void warn(const char* fmt, ...) {
48 va_list args;
49
50 if (!fmt || options->quiet)
51 return;
52
53 va_start(args, fmt);
54 fprintf(stderr, "sxiv: warning: ");
55 vfprintf(stderr, fmt, args);
56 fprintf(stderr, "\n");
57 va_end(args);
58}
59
60void die(const char* fmt, ...) {
61 va_list args;
62
63 if (!fmt)
64 return;
65
66 va_start(args, fmt);
67 fprintf(stderr, "sxiv: error: ");
68 vfprintf(stderr, fmt, args);
69 fprintf(stderr, "\n");
70 va_end(args);
71
72 cleanup();
73 exit(1);
74}
75
76void size_readable(float *size, const char **unit) {
77 const char *units[] = { "", "K", "M", "G" };
78 int i;
79
80 for (i = 0; i < LEN(units) && *size > 1024; ++i)
81 *size /= 1024;
82 *unit = units[MIN(i, LEN(units) - 1)];
83}
84
85char* absolute_path(const char *filename) {
86 size_t len;
87 char *path = NULL;
88 const char *basename;
89 char *dirname = NULL;
90 char *cwd = NULL;
91 char *twd = NULL;
92 char *dir;
93 char *s;
94
95 if (!filename || *filename == '\0' || *filename == '/')
96 return NULL;
97
98 len = FNAME_LEN;
99 cwd = (char*) s_malloc(len);
100 while (!(s = getcwd(cwd, len)) && errno == ERANGE) {
101 len *= 2;
102 cwd = (char*) s_realloc(cwd, len);
103 }
104 if (!s)
105 goto error;
106
107 s = strrchr(filename, '/');
108 if (s) {
109 len = s - filename;
110 dirname = (char*) s_malloc(len + 1);
111 strncpy(dirname, filename, len);
112 dirname[len] = '\0';
113 basename = s + 1;
114
115 if (chdir(cwd))
116 /* we're not able to come back afterwards */
117 goto error;
118 if (chdir(dirname))
119 goto error;
120
121 len = FNAME_LEN;
122 twd = (char*) s_malloc(len);
123 while (!(s = getcwd(twd, len)) && errno == ERANGE) {
124 len *= 2;
125 twd = (char*) s_realloc(twd, len);
126 }
127 if (chdir(cwd))
128 die("could not revert to prior working directory");
129 if (!s)
130 goto error;
131 dir = twd;
132 } else {
133 /* only a single filename given */
134 basename = filename;
135 dir = cwd;
136 }
137
138 len = strlen(dir) + strlen(basename) + 2;
139 path = (char*) s_malloc(len);
140 snprintf(path, len, "%s/%s", dir, basename);
141
142goto end;
143
144error:
145 if (path) {
146 free(path);
147 path = NULL;
148 }
149
150end:
151 if (dirname)
152 free(dirname);
153 if (cwd)
154 free(cwd);
155 if (twd)
156 free(twd);
157
158 return path;
159}
160
161int create_dir_rec(const char *path) {
162 char *dir, *d;
163 struct stat stats;
164 int err = 0;
165
166 if (!path || !*path)
167 return -1;
168
169 if (!stat(path, &stats)) {
170 if (S_ISDIR(stats.st_mode)) {
171 return 0;
172 } else {
173 warn("not a directory: %s", path);
174 return -1;
175 }
176 }
177
178 d = dir = (char*) s_malloc(strlen(path) + 1);
179 strcpy(dir, path);
180
181 while (d != NULL && !err) {
182 d = strchr(d + 1, '/');
183 if (d != NULL)
184 *d = '\0';
185 if (access(dir, F_OK) && errno == ENOENT) {
186 if (mkdir(dir, 0755)) {
187 warn("could not create directory: %s", dir);
188 err = -1;
189 }
190 } else if (stat(dir, &stats) || !S_ISDIR(stats.st_mode)) {
191 warn("not a directory: %s", dir);
192 err = -1;
193 }
194 if (d != NULL)
195 *d = '/';
196 }
197 free(dir);
198
199 return err;
200}
201
202char* readline(FILE *stream) {
203 size_t len;
204 char *buf, *s, *end;
205
206 if (!stream || feof(stream) || ferror(stream))
207 return NULL;
208
209 len = FNAME_LEN;
210 s = buf = (char*) s_malloc(len * sizeof(char));
211
212 do {
213 *s = '\0';
214 fgets(s, len - (s - buf), stream);
215 if ((end = strchr(s, '\n'))) {
216 *end = '\0';
217 } else if (strlen(s) + 1 == len - (s - buf)) {
218 buf = (char*) s_realloc(buf, 2 * len * sizeof(char));
219 s = buf + len - 1;
220 len *= 2;
221 } else {
222 s += strlen(s);
223 }
224 } while (!end && !feof(stream) && !ferror(stream));
225
226 if (ferror(stream)) {
227 s = NULL;
228 } else {
229 s = (char*) s_malloc((strlen(buf) + 1) * sizeof(char));
230 strcpy(s, buf);
231 }
232
233 free(buf);
234
235 return s;
236}