nsxiv/util.c

316 lines
6.3 KiB
C

/* 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 <dirent.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_CNT 1024
#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 create_dir_rec(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;
}
int fncmp(const void *a, const void *b) {
return strcoll(*((char* const*) a), *((char* const*) b));
}
char** read_dir_rec(const char *dirname) {
int dcnt, didx, fcnt, fidx;
char **dnames, **fnames, *filename;
unsigned char first;
size_t len;
DIR *dir;
struct dirent *dentry;
struct stat fstats;
if (!dirname)
return NULL;
dcnt = DNAME_CNT;
didx = first = 1;
dnames = (char**) s_malloc(dcnt * sizeof(char*));
dnames[0] = (char*) dirname;
fcnt = FNAME_CNT;
fidx = 0;
fnames = (char**) s_malloc(fcnt * sizeof(char*));
while (didx > 0) {
dirname = dnames[--didx];
if (!(dir = opendir(dirname))) {
warn("could not open directory: %s", dirname);
} else {
while ((dentry = readdir(dir))) {
if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
continue;
len = strlen(dirname) + strlen(dentry->d_name) + 2;
filename = (char*) s_malloc(len * sizeof(char));
snprintf(filename, len, "%s%s%s", dirname,
dirname[strlen(dirname)-1] == '/' ? "" : "/", dentry->d_name);
if (!stat(filename, &fstats) && S_ISDIR(fstats.st_mode)) {
if (didx == dcnt) {
dcnt *= 2;
dnames = (char**) s_realloc(dnames, dcnt * sizeof(char*));
}
dnames[didx++] = filename;
} else {
if (fidx + 1 == fcnt) {
fcnt *= 2;
fnames = (char**) s_realloc(fnames, fcnt * sizeof(char*));
}
fnames[fidx++] = filename;
}
}
closedir(dir);
}
if (!first)
free((void*) dirname);
else
first = 0;
}
if (!fidx) {
free(fnames);
fnames = NULL;
} else {
if (fidx > 1)
qsort(fnames, fidx, sizeof(char*), fncmp);
fnames[fidx] = NULL;
}
free(dnames);
return fnames;
}
char* readline(FILE *stream) {
size_t len;
char *buf, *s, *end;
if (!stream || feof(stream) || ferror(stream))
return NULL;
len = FNAME_LEN;
s = buf = (char*) s_malloc(len * sizeof(char));
do {
*s = '\0';
fgets(s, len - (s - buf), stream);
if ((end = strchr(s, '\n'))) {
*end = '\0';
} else if (strlen(s) + 1 == len - (s - buf)) {
buf = (char*) s_realloc(buf, 2 * len * sizeof(char));
s = buf + len - 1;
len *= 2;
} else {
s += strlen(s);
}
} while (!end && !feof(stream) && !ferror(stream));
if (ferror(stream)) {
s = NULL;
} else {
s = (char*) s_malloc((strlen(buf) + 1) * sizeof(char));
strcpy(s, buf);
}
free(buf);
return s;
}