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/* sxiv: util.c
* Copyright (c) 2011 Bert Muennich <muennich at informatik.hu-berlin.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include "options.h"
#include "util.h"
#define DNAME_CNT 512
#define FNAME_LEN 1024
void cleanup();
void* s_malloc(size_t size) {
void *ptr;
if (!(ptr = malloc(size)))
die("could not allocate memory");
return ptr;
}
void* s_realloc(void *ptr, size_t size) {
if (!(ptr = realloc(ptr, size)))
die("could not allocate memory");
return ptr;
}
void warn(const char* fmt, ...) {
va_list args;
if (!fmt || options->quiet)
return;
va_start(args, fmt);
fprintf(stderr, "sxiv: warning: ");
vfprintf(stderr, fmt, args);
fprintf(stderr, "\n");
va_end(args);
}
void die(const char* fmt, ...) {
va_list args;
if (!fmt)
return;
va_start(args, fmt);
fprintf(stderr, "sxiv: error: ");
vfprintf(stderr, fmt, args);
fprintf(stderr, "\n");
va_end(args);
cleanup();
exit(1);
}
void size_readable(float *size, const char **unit) {
const char *units[] = { "", "K", "M", "G" };
int i;
for (i = 0; i < LEN(units) && *size > 1024; ++i)
*size /= 1024;
*unit = units[MIN(i, LEN(units) - 1)];
}
char* absolute_path(const char *filename) {
size_t len;
char *path = NULL;
const char *basename;
char *dirname = NULL;
char *cwd = NULL;
char *twd = NULL;
char *dir;
char *s;
if (!filename || *filename == '\0' || *filename == '/')
return NULL;
len = FNAME_LEN;
cwd = (char*) s_malloc(len);
while (!(s = getcwd(cwd, len)) && errno == ERANGE) {
len *= 2;
cwd = (char*) s_realloc(cwd, len);
}
if (!s)
goto error;
s = strrchr(filename, '/');
if (s) {
len = s - filename;
dirname = (char*) s_malloc(len + 1);
strncpy(dirname, filename, len);
dirname[len] = '\0';
basename = s + 1;
if (chdir(cwd))
/* we're not able to come back afterwards */
goto error;
if (chdir(dirname))
goto error;
len = FNAME_LEN;
twd = (char*) s_malloc(len);
while (!(s = getcwd(twd, len)) && errno == ERANGE) {
len *= 2;
twd = (char*) s_realloc(twd, len);
}
if (chdir(cwd))
die("could not revert to prior working directory");
if (!s)
goto error;
dir = twd;
} else {
/* only a single filename given */
basename = filename;
dir = cwd;
}
len = strlen(dir) + strlen(basename) + 2;
path = (char*) s_malloc(len);
snprintf(path, len, "%s/%s", dir, basename);
goto end;
error:
if (path) {
free(path);
path = NULL;
}
end:
if (dirname)
free(dirname);
if (cwd)
free(cwd);
if (twd)
free(twd);
return path;
}
int r_opendir(r_dir_t *rdir, const char *dirname) {
if (!rdir || !dirname || !*dirname)
return -1;
if (!(rdir->dir = opendir(dirname))) {
rdir->name = NULL;
rdir->stack = NULL;
return -1;
}
rdir->stcap = DNAME_CNT;
rdir->stack = (char**) s_malloc(rdir->stcap * sizeof(char*));
rdir->stlen = 0;
rdir->name = (char*) dirname;
rdir->d = 0;
return 0;
}
int r_closedir(r_dir_t *rdir) {
int ret = 0;
if (!rdir)
return -1;
if (rdir->stack) {
while (rdir->stlen > 0)
free(rdir->stack[--rdir->stlen]);
free(rdir->stack);
rdir->stack = NULL;
}
if (rdir->dir) {
if (!(ret = closedir(rdir->dir)))
rdir->dir = NULL;
}
if (rdir->d && rdir->name) {
free(rdir->name);
rdir->name = NULL;
}
return ret;
}
char* r_readdir(r_dir_t *rdir) {
size_t len;
char *filename;
struct dirent *dentry;
struct stat fstats;
if (!rdir || !rdir->dir || !rdir->name)
return NULL;
while (1) {
if (rdir->dir && (dentry = readdir(rdir->dir))) {
if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
continue;
len = strlen(rdir->name) + strlen(dentry->d_name) + 2;
filename = (char*) s_malloc(len);
snprintf(filename, len, "%s%s%s", rdir->name,
rdir->name[strlen(rdir->name)-1] == '/' ? "" : "/",
dentry->d_name);
if (!stat(filename, &fstats) && S_ISDIR(fstats.st_mode)) {
/* put subdirectory on the stack */
if (rdir->stlen == rdir->stcap) {
rdir->stcap *= 2;
rdir->stack = (char**) s_realloc(rdir->stack,
rdir->stcap * sizeof(char*));
}
rdir->stack[rdir->stlen++] = filename;
continue;
}
return filename;
}
if (rdir->stlen > 0) {
/* open next subdirectory */
closedir(rdir->dir);
if (rdir->d)
free(rdir->name);
rdir->name = rdir->stack[--rdir->stlen];
rdir->d = 1;
if (!(rdir->dir = opendir(rdir->name)))
warn("could not open directory: %s", rdir->name);
continue;
}
/* no more entries */
break;
}
return NULL;
}
int r_mkdir(const char *path) {
char *dir, *d;
struct stat stats;
int err = 0;
if (!path || !*path)
return -1;
if (!stat(path, &stats)) {
if (S_ISDIR(stats.st_mode)) {
return 0;
} else {
warn("not a directory: %s", path);
return -1;
}
}
d = dir = (char*) s_malloc(strlen(path) + 1);
strcpy(dir, path);
while (d != NULL && !err) {
d = strchr(d + 1, '/');
if (d != NULL)
*d = '\0';
if (access(dir, F_OK) && errno == ENOENT) {
if (mkdir(dir, 0755)) {
warn("could not create directory: %s", dir);
err = -1;
}
} else if (stat(dir, &stats) || !S_ISDIR(stats.st_mode)) {
warn("not a directory: %s", dir);
err = -1;
}
if (d != NULL)
*d = '/';
}
free(dir);
return err;
}
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