nsxiv/util.c

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C
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/* sxiv: util.c
* Copyright (c) 2011 Bert Muennich <muennich at informatik.hu-berlin.de>
*
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* 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.
*
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* 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.
*
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* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
#define _POSIX_C_SOURCE 200112L
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
#include <sys/stat.h>
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#include <unistd.h>
#include <errno.h>
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#include "options.h"
#include "util.h"
enum {
BUF_SIZE = 1024,
DNAME_CNT = 512,
FNAME_LEN = 1024
};
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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;
}
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char* s_strdup(char *s) {
char *d = NULL;
if (s) {
if (!(d = malloc(strlen(s) + 1)))
die("could not allocate memory");
strcpy(d, s);
}
return d;
}
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void warn(const char* fmt, ...) {
va_list args;
if (!fmt || options->quiet)
return;
va_start(args, fmt);
fprintf(stderr, "sxiv: warning: ");
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vfprintf(stderr, fmt, args);
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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: ");
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vfprintf(stderr, fmt, args);
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fprintf(stderr, "\n");
va_end(args);
cleanup();
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exit(EXIT_FAILURE);
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}
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ssize_t get_line(char **buf, size_t *n, FILE *stream) {
size_t len;
char *s;
if (!stream || feof(stream) || ferror(stream))
return -1;
if (!*buf || !*n) {
*n = BUF_SIZE;
*buf = (char*) s_malloc(*n);
}
s = *buf;
while (1) {
if (!fgets(s, *n - (s - *buf), stream))
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;
}
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void size_readable(float *size, const char **unit) {
const char *units[] = { "", "K", "M", "G" };
int i;
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for (i = 0; i < ARRLEN(units) && *size > 1024.0; i++)
*size /= 1024.0;
*unit = units[MIN(i, ARRLEN(units) - 1)];
}
void time_readable(float *time, const char **unit) {
const char *units[] = { "s", "m", "h" };
int i;
for (i = 0; i < ARRLEN(units) && *time >= 60.0; i++)
*time /= 60.0;
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*unit = units[MIN(i, ARRLEN(units) - 1)];
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}
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char* absolute_path(const char *filename) {
size_t len;
const char *basename;
char *dir, *dirname = NULL, *path = NULL, *s;
char *cwd = NULL, *twd = NULL;
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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");
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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);
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goto end;
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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))) {
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if (STREQ(dentry->d_name, ".") || STREQ(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) {
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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;
}