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/* Copyright 2011 Bert Muennich
*
* This file is part of sxiv.
*
* sxiv 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.
*
* sxiv 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 sxiv. If not, see <http://www.gnu.org/licenses/>.
*/
#define _POSIX_C_SOURCE 200112L
#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"
enum {
BUF_SIZE = 1024,
DNAME_CNT = 512,
FNAME_LEN = 1024
};
void cleanup(void);
void* s_malloc(size_t size)
{
void *ptr;
ptr = malloc(size);
if (ptr == NULL)
die("could not allocate memory");
return ptr;
}
void* s_realloc(void *ptr, size_t size)
{
ptr = realloc(ptr, size);
if (ptr == NULL)
die("could not allocate memory");
return ptr;
}
char* s_strdup(char *s)
{
char *d = NULL;
if (s != NULL) {
d = malloc(strlen(s) + 1);
if (d == NULL)
die("could not allocate memory");
strcpy(d, s);
}
return d;
}
void warn(const char* fmt, ...)
{
va_list args;
if (fmt == NULL || 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 == NULL)
return;
va_start(args, fmt);
fprintf(stderr, "sxiv: error: ");
vfprintf(stderr, fmt, args);
fprintf(stderr, "\n");
va_end(args);
cleanup();
exit(EXIT_FAILURE);
}
ssize_t get_line(char **buf, size_t *n, FILE *stream)
{
size_t len;
char *s;
if (stream == NULL || feof(stream) || ferror(stream))
return -1;
if (*buf == NULL || *n == 0) {
*n = BUF_SIZE;
*buf = (char*) s_malloc(*n);
}
s = *buf;
while (true) {
if (fgets(s, *n - (s - *buf), stream) == NULL)
return -1;
len = strlen(s);
if (feof(stream))
break;
if (len > 0 && s[len-1] == '\n')
break;
if (len + 1 == *n - (s - *buf)) {
*buf = (char*) s_realloc(*buf, 2 * *n);
s = *buf + *n - 1;
*n *= 2;
} else {
s += len;
}
}
return s - *buf + len;
}
void size_readable(float *size, const char **unit)
{
const char *units[] = { "", "K", "M", "G" };
int i;
for (i = 0; i < ARRLEN(units) && *size > 1024.0; i++)
*size /= 1024.0;
*unit = units[MIN(i, ARRLEN(units) - 1)];
}
char* absolute_path(const char *filename)
{
size_t len;
const char *basename;
char *dir, *dirname = NULL, *path = NULL, *s;
char *cwd = NULL, *twd = NULL;
if (filename == NULL || *filename == '\0' || *filename == '/')
return NULL;
len = FNAME_LEN;
cwd = (char*) s_malloc(len);
while ((s = getcwd(cwd, len)) == NULL && errno == ERANGE) {
len *= 2;
cwd = (char*) s_realloc(cwd, len);
}
if (s == NULL)
goto error;
s = strrchr(filename, '/');
if (s != NULL) {
len = s - filename;
dirname = (char*) s_malloc(len + 1);
strncpy(dirname, filename, len);
dirname[len] = '\0';
basename = s + 1;
if (chdir(cwd) < 0)
/* we're not able to come back afterwards */
goto error;
if (chdir(dirname) < 0)
goto error;
len = FNAME_LEN;
twd = (char*) s_malloc(len);
while ((s = getcwd(twd, len)) == NULL && errno == ERANGE) {
len *= 2;
twd = (char*) s_realloc(twd, len);
}
if (chdir(cwd) < 0)
die("could not revert to prior working directory");
if (s == NULL)
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 != NULL) {
free(path);
path = NULL;
}
end:
if (dirname != NULL)
free(dirname);
if (cwd != NULL)
free(cwd);
if (twd != NULL)
free(twd);
return path;
}
int r_opendir(r_dir_t *rdir, const char *dirname)
{
if (rdir == NULL || dirname == NULL || *dirname == '\0')
return -1;
if ((rdir->dir = opendir(dirname)) == NULL) {
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 == NULL)
return -1;
if (rdir->stack != NULL) {
while (rdir->stlen > 0)
free(rdir->stack[--rdir->stlen]);
free(rdir->stack);
rdir->stack = NULL;
}
if (rdir->dir != NULL) {
if ((ret = closedir(rdir->dir)) == 0)
rdir->dir = NULL;
}
if (rdir->d != 0 && rdir->name != NULL) {
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 == NULL || rdir->dir == NULL || rdir->name == NULL)
return NULL;
while (true) {
if (rdir->dir != NULL && (dentry = readdir(rdir->dir)) != NULL) {
if (dentry->d_name[0] == '.')
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) < 0)
continue;
if (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 != 0)
free(rdir->name);
rdir->name = rdir->stack[--rdir->stlen];
rdir->d = 1;
if ((rdir->dir = opendir(rdir->name)) == NULL)
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 == NULL || *path == '\0')
return -1;
if (stat(path, &stats) == 0) {
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 == 0) {
d = strchr(d + 1, '/');
if (d != NULL)
*d = '\0';
if (access(dir, F_OK) < 0 && errno == ENOENT) {
if (mkdir(dir, 0755) < 0) {
warn("could not create directory: %s", dir);
err = -1;
}
} else if (stat(dir, &stats) < 0 || !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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