2011-02-03 10:15:01 +01:00
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/* sxiv: util.c
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* Copyright (c) 2011 Bert Muennich <muennich at informatik.hu-berlin.de>
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*
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2011-09-03 23:11:45 +02:00
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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2011-08-18 01:18:26 +02:00
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*
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2011-09-03 23:11:45 +02:00
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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2011-08-18 01:18:26 +02:00
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*
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2011-09-03 23:11:45 +02:00
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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2011-02-03 10:15:01 +01:00
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*/
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2011-09-08 20:54:24 +02:00
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#define _POSIX_C_SOURCE 200112L
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2011-02-03 10:15:01 +01:00
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#include <stdlib.h>
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2011-02-14 17:51:04 +01:00
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#include <string.h>
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2011-04-07 17:29:59 +02:00
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#include <sys/types.h>
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#include <sys/stat.h>
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2011-04-07 14:33:57 +02:00
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#include <unistd.h>
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#include <errno.h>
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2011-02-03 10:15:01 +01:00
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#include "options.h"
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#include "util.h"
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2011-07-26 18:01:29 +02:00
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enum {
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2011-09-08 20:54:24 +02:00
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BUF_SIZE = 1024,
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2011-07-26 18:01:29 +02:00
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DNAME_CNT = 512,
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FNAME_LEN = 1024
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};
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2011-02-14 17:51:04 +01:00
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2011-02-03 10:15:01 +01:00
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void cleanup();
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void* s_malloc(size_t size) {
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void *ptr;
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if (!(ptr = malloc(size)))
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die("could not allocate memory");
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return ptr;
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}
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void* s_realloc(void *ptr, size_t size) {
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if (!(ptr = realloc(ptr, size)))
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die("could not allocate memory");
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return ptr;
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}
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2011-08-18 00:38:55 +02:00
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char* s_strdup(char *s) {
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char *d = NULL;
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if (s) {
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if (!(d = malloc(strlen(s) + 1)))
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die("could not allocate memory");
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strcpy(d, s);
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}
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return d;
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}
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2011-02-03 10:15:01 +01:00
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void warn(const char* fmt, ...) {
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va_list args;
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if (!fmt || options->quiet)
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return;
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va_start(args, fmt);
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fprintf(stderr, "sxiv: warning: ");
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2011-02-03 10:54:31 +01:00
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vfprintf(stderr, fmt, args);
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2011-02-03 10:15:01 +01:00
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fprintf(stderr, "\n");
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va_end(args);
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}
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void die(const char* fmt, ...) {
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va_list args;
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if (!fmt)
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return;
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va_start(args, fmt);
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fprintf(stderr, "sxiv: error: ");
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2011-02-03 10:54:31 +01:00
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vfprintf(stderr, fmt, args);
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2011-02-03 10:15:01 +01:00
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fprintf(stderr, "\n");
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va_end(args);
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cleanup();
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2011-09-26 15:40:07 +02:00
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exit(EXIT_FAILURE);
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2011-02-03 10:15:01 +01:00
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}
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2011-02-03 14:32:02 +01:00
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2011-09-08 20:54:24 +02:00
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ssize_t get_line(char **buf, size_t *n, FILE *stream) {
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size_t len;
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char *s;
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if (!stream || feof(stream) || ferror(stream))
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return -1;
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if (!*buf || !*n) {
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*n = BUF_SIZE;
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*buf = (char*) s_malloc(*n);
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}
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s = *buf;
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while (1) {
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if (!fgets(s, *n - (s - *buf), stream))
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return -1;
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len = strlen(s);
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if (feof(stream))
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break;
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if (len > 0 && s[len-1] == '\n')
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break;
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if (len + 1 == *n - (s - *buf)) {
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*buf = (char*) s_realloc(*buf, 2 * *n);
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s = *buf + *n - 1;
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*n *= 2;
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} else {
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s += len;
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}
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}
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return s - *buf + len;
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}
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2011-02-03 14:32:02 +01:00
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void size_readable(float *size, const char **unit) {
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const char *units[] = { "", "K", "M", "G" };
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int i;
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2011-09-10 18:41:20 +02:00
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for (i = 0; i < ARRLEN(units) && *size > 1024.0; i++)
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*size /= 1024.0;
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*unit = units[MIN(i, ARRLEN(units) - 1)];
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}
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void time_readable(float *time, const char **unit) {
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const char *units[] = { "s", "m", "h" };
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int i;
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for (i = 0; i < ARRLEN(units) && *time >= 60.0; i++)
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*time /= 60.0;
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2011-09-06 09:11:03 +02:00
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*unit = units[MIN(i, ARRLEN(units) - 1)];
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2011-02-03 14:32:02 +01:00
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}
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2011-02-14 17:51:04 +01:00
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2011-04-07 14:33:57 +02:00
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char* absolute_path(const char *filename) {
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size_t len;
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const char *basename;
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2011-09-08 20:54:24 +02:00
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char *dir, *dirname = NULL, *path = NULL, *s;
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char *cwd = NULL, *twd = NULL;
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2011-04-07 14:33:57 +02:00
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if (!filename || *filename == '\0' || *filename == '/')
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return NULL;
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len = FNAME_LEN;
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cwd = (char*) s_malloc(len);
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while (!(s = getcwd(cwd, len)) && errno == ERANGE) {
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len *= 2;
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cwd = (char*) s_realloc(cwd, len);
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}
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if (!s)
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goto error;
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s = strrchr(filename, '/');
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if (s) {
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len = s - filename;
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dirname = (char*) s_malloc(len + 1);
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strncpy(dirname, filename, len);
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dirname[len] = '\0';
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basename = s + 1;
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if (chdir(cwd))
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/* we're not able to come back afterwards */
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goto error;
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if (chdir(dirname))
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goto error;
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len = FNAME_LEN;
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twd = (char*) s_malloc(len);
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while (!(s = getcwd(twd, len)) && errno == ERANGE) {
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len *= 2;
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twd = (char*) s_realloc(twd, len);
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}
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if (chdir(cwd))
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2011-04-07 16:17:10 +02:00
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die("could not revert to prior working directory");
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2011-04-07 14:33:57 +02:00
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if (!s)
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goto error;
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dir = twd;
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} else {
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/* only a single filename given */
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basename = filename;
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dir = cwd;
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}
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len = strlen(dir) + strlen(basename) + 2;
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path = (char*) s_malloc(len);
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snprintf(path, len, "%s/%s", dir, basename);
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2011-05-29 11:45:58 +02:00
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goto end;
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2011-04-07 14:33:57 +02:00
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error:
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if (path) {
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free(path);
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path = NULL;
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}
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end:
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if (dirname)
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free(dirname);
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if (cwd)
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free(cwd);
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if (twd)
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free(twd);
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return path;
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}
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2011-04-08 10:23:42 +02:00
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int r_opendir(r_dir_t *rdir, const char *dirname) {
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if (!rdir || !dirname || !*dirname)
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return -1;
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if (!(rdir->dir = opendir(dirname))) {
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rdir->name = NULL;
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rdir->stack = NULL;
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return -1;
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}
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rdir->stcap = DNAME_CNT;
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rdir->stack = (char**) s_malloc(rdir->stcap * sizeof(char*));
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rdir->stlen = 0;
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rdir->name = (char*) dirname;
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rdir->d = 0;
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return 0;
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}
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int r_closedir(r_dir_t *rdir) {
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int ret = 0;
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if (!rdir)
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return -1;
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if (rdir->stack) {
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while (rdir->stlen > 0)
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free(rdir->stack[--rdir->stlen]);
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free(rdir->stack);
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rdir->stack = NULL;
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}
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if (rdir->dir) {
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if (!(ret = closedir(rdir->dir)))
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rdir->dir = NULL;
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}
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if (rdir->d && rdir->name) {
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free(rdir->name);
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rdir->name = NULL;
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}
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return ret;
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}
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char* r_readdir(r_dir_t *rdir) {
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size_t len;
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char *filename;
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struct dirent *dentry;
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struct stat fstats;
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if (!rdir || !rdir->dir || !rdir->name)
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return NULL;
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while (1) {
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if (rdir->dir && (dentry = readdir(rdir->dir))) {
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if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
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continue;
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len = strlen(rdir->name) + strlen(dentry->d_name) + 2;
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filename = (char*) s_malloc(len);
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snprintf(filename, len, "%s%s%s", rdir->name,
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rdir->name[strlen(rdir->name)-1] == '/' ? "" : "/",
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dentry->d_name);
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if (!stat(filename, &fstats) && S_ISDIR(fstats.st_mode)) {
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/* put subdirectory on the stack */
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if (rdir->stlen == rdir->stcap) {
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rdir->stcap *= 2;
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rdir->stack = (char**) s_realloc(rdir->stack,
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rdir->stcap * sizeof(char*));
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}
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rdir->stack[rdir->stlen++] = filename;
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continue;
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}
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return filename;
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}
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if (rdir->stlen > 0) {
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/* open next subdirectory */
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closedir(rdir->dir);
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if (rdir->d)
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free(rdir->name);
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rdir->name = rdir->stack[--rdir->stlen];
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rdir->d = 1;
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if (!(rdir->dir = opendir(rdir->name)))
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warn("could not open directory: %s", rdir->name);
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continue;
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}
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/* no more entries */
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break;
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}
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return NULL;
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}
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int r_mkdir(const char *path) {
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2011-04-07 17:29:59 +02:00
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char *dir, *d;
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struct stat stats;
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int err = 0;
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if (!path || !*path)
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return -1;
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if (!stat(path, &stats)) {
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if (S_ISDIR(stats.st_mode)) {
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return 0;
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} else {
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warn("not a directory: %s", path);
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return -1;
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}
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}
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d = dir = (char*) s_malloc(strlen(path) + 1);
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strcpy(dir, path);
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while (d != NULL && !err) {
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d = strchr(d + 1, '/');
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if (d != NULL)
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*d = '\0';
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if (access(dir, F_OK) && errno == ENOENT) {
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if (mkdir(dir, 0755)) {
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warn("could not create directory: %s", dir);
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err = -1;
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}
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} else if (stat(dir, &stats) || !S_ISDIR(stats.st_mode)) {
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warn("not a directory: %s", dir);
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err = -1;
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}
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if (d != NULL)
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*d = '/';
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}
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free(dir);
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return err;
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}
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