316 lines
6.3 KiB
C
316 lines
6.3 KiB
C
/* 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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <dirent.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <errno.h>
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#include "options.h"
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#include "util.h"
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#define DNAME_CNT 512
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#define FNAME_CNT 1024
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#define FNAME_LEN 1024
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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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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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vfprintf(stderr, fmt, args);
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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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vfprintf(stderr, fmt, args);
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fprintf(stderr, "\n");
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va_end(args);
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cleanup();
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exit(1);
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}
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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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for (i = 0; i < LEN(units) && *size > 1024; ++i)
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*size /= 1024;
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*unit = units[MIN(i, LEN(units) - 1)];
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}
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char* absolute_path(const char *filename) {
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size_t len;
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char *path = NULL;
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const char *basename;
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char *dirname = NULL;
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char *cwd = NULL;
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char *twd = NULL;
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char *dir;
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char *s;
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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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die("could not revert to prior working directory");
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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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goto end;
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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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int create_dir_rec(const char *path) {
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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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int fncmp(const void *a, const void *b) {
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return strcoll(*((char* const*) a), *((char* const*) b));
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}
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char** read_dir_rec(const char *dirname) {
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int dcnt, didx, fcnt, fidx;
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char **dnames, **fnames, *filename;
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unsigned char first;
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size_t len;
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DIR *dir;
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struct dirent *dentry;
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struct stat fstats;
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if (!dirname)
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return NULL;
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dcnt = DNAME_CNT;
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didx = first = 1;
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dnames = (char**) s_malloc(dcnt * sizeof(char*));
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dnames[0] = (char*) dirname;
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fcnt = FNAME_CNT;
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fidx = 0;
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fnames = (char**) s_malloc(fcnt * sizeof(char*));
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while (didx > 0) {
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dirname = dnames[--didx];
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if (!(dir = opendir(dirname))) {
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warn("could not open directory: %s", dirname);
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} else {
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while ((dentry = readdir(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(dirname) + strlen(dentry->d_name) + 2;
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filename = (char*) s_malloc(len * sizeof(char));
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snprintf(filename, len, "%s%s%s", dirname,
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dirname[strlen(dirname)-1] == '/' ? "" : "/", dentry->d_name);
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if (!stat(filename, &fstats) && S_ISDIR(fstats.st_mode)) {
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if (didx == dcnt) {
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dcnt *= 2;
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dnames = (char**) s_realloc(dnames, dcnt * sizeof(char*));
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}
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dnames[didx++] = filename;
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} else {
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if (fidx + 1 == fcnt) {
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fcnt *= 2;
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fnames = (char**) s_realloc(fnames, fcnt * sizeof(char*));
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}
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fnames[fidx++] = filename;
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}
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}
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closedir(dir);
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}
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if (!first)
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free((void*) dirname);
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else
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first = 0;
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}
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if (!fidx) {
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free(fnames);
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fnames = NULL;
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} else {
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if (fidx > 1)
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qsort(fnames, fidx, sizeof(char*), fncmp);
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fnames[fidx] = NULL;
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}
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free(dnames);
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return fnames;
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}
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char* readline(FILE *stream) {
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size_t len;
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char *buf, *s, *end;
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if (!stream || feof(stream) || ferror(stream))
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return NULL;
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len = FNAME_LEN;
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s = buf = (char*) s_malloc(len * sizeof(char));
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do {
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*s = '\0';
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fgets(s, len - (s - buf), stream);
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if ((end = strchr(s, '\n'))) {
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*end = '\0';
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} else if (strlen(s) + 1 == len - (s - buf)) {
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buf = (char*) s_realloc(buf, 2 * len * sizeof(char));
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s = buf + len - 1;
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len *= 2;
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} else {
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s += strlen(s);
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}
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} while (!end && !feof(stream) && !ferror(stream));
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if (ferror(stream)) {
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s = NULL;
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} else {
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s = (char*) s_malloc((strlen(buf) + 1) * sizeof(char));
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strcpy(s, buf);
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}
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free(buf);
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return s;
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}
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