336 lines
6.4 KiB
C
336 lines
6.4 KiB
C
/* Copyright 2011 Bert Muennich
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*
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* This file is part of sxiv.
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*
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* sxiv 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
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* by the Free Software Foundation; either version 2 of the License,
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* or (at your option) any later version.
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*
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* sxiv 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 sxiv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <string.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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enum {
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BUF_SIZE = 1024,
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DNAME_CNT = 512,
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FNAME_LEN = 1024
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};
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void cleanup(void);
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void* s_malloc(size_t size)
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{
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void *ptr;
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ptr = malloc(size);
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if (ptr == NULL)
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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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{
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ptr = realloc(ptr, size);
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if (ptr == NULL)
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die("could not allocate memory");
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return ptr;
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}
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char* s_strdup(const char *s)
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{
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char *d = NULL;
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if (s != NULL) {
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d = malloc(strlen(s) + 1);
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if (d == NULL)
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die("could not allocate memory");
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strcpy(d, s);
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}
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return d;
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}
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void warn(const char* fmt, ...)
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{
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va_list args;
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if (fmt == NULL || 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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{
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va_list args;
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if (fmt == NULL)
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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(EXIT_FAILURE);
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}
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ssize_t get_line(char **buf, size_t *n, FILE *stream)
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{
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size_t len;
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char *s;
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if (*buf == NULL || *n == 0) {
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*n = BUF_SIZE;
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*buf = (char*) s_malloc(*n);
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}
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s = *buf;
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while (true) {
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if (fgets(s, *n - (s - *buf), stream) == NULL)
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return -1;
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len = strlen(s);
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if (feof(stream))
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break;
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if (len > 0 && s[len-1] == '\n')
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break;
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if (len + 1 == *n - (s - *buf)) {
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*buf = (char*) s_realloc(*buf, 2 * *n);
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s = *buf + *n - 1;
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*n *= 2;
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} else {
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s += len;
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}
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}
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return s - *buf + len;
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}
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void size_readable(float *size, const char **unit)
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{
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const char *units[] = { "", "K", "M", "G" };
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int i;
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for (i = 0; i < ARRLEN(units) && *size > 1024.0; i++)
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*size /= 1024.0;
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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)
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{
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size_t len;
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const char *basename;
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char *dir, *dirname = NULL, *path = NULL, *s;
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char *cwd = NULL, *twd = NULL;
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if (*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)) == NULL && 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 == NULL)
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goto error;
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s = strrchr(filename, '/');
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if (s != NULL) {
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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) < 0)
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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) < 0)
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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)) == NULL && 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) < 0)
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die("could not revert to prior working directory");
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if (s == NULL)
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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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free(path);
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path = NULL;
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end:
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free(dirname);
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free(cwd);
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free(twd);
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return path;
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}
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int r_opendir(r_dir_t *rdir, const char *dirname)
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{
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if (*dirname == '\0')
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return -1;
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if ((rdir->dir = opendir(dirname)) == NULL) {
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rdir->name = NULL;
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rdir->stack = NULL;
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return -1;
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}
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rdir->stcap = DNAME_CNT;
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rdir->stack = (char**) s_malloc(rdir->stcap * sizeof(char*));
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rdir->stlen = 0;
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rdir->name = (char*) dirname;
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rdir->d = 0;
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return 0;
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}
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int r_closedir(r_dir_t *rdir)
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{
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int ret = 0;
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if (rdir->stack != NULL) {
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while (rdir->stlen > 0)
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free(rdir->stack[--rdir->stlen]);
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free(rdir->stack);
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rdir->stack = NULL;
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}
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if (rdir->dir != NULL) {
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if ((ret = closedir(rdir->dir)) == 0)
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rdir->dir = NULL;
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}
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if (rdir->d != 0) {
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free(rdir->name);
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rdir->name = NULL;
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}
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return ret;
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}
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char* r_readdir(r_dir_t *rdir)
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{
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size_t len;
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char *filename;
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struct dirent *dentry;
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struct stat fstats;
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while (true) {
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if (rdir->dir != NULL && (dentry = readdir(rdir->dir)) != NULL) {
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if (dentry->d_name[0] == '.')
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continue;
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len = strlen(rdir->name) + strlen(dentry->d_name) + 2;
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filename = (char*) s_malloc(len);
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snprintf(filename, len, "%s%s%s", rdir->name,
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rdir->name[strlen(rdir->name)-1] == '/' ? "" : "/",
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dentry->d_name);
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if (stat(filename, &fstats) < 0)
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continue;
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if (S_ISDIR(fstats.st_mode)) {
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/* put subdirectory on the stack */
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if (rdir->stlen == rdir->stcap) {
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rdir->stcap *= 2;
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rdir->stack = (char**) s_realloc(rdir->stack,
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rdir->stcap * sizeof(char*));
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}
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rdir->stack[rdir->stlen++] = filename;
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continue;
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}
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return filename;
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}
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if (rdir->stlen > 0) {
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/* open next subdirectory */
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closedir(rdir->dir);
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if (rdir->d != 0)
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free(rdir->name);
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rdir->name = rdir->stack[--rdir->stlen];
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rdir->d = 1;
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if ((rdir->dir = opendir(rdir->name)) == NULL)
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warn("could not open directory: %s", rdir->name);
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continue;
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}
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/* no more entries */
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break;
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}
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return NULL;
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}
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int r_mkdir(const char *path)
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{
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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 == '\0')
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return -1;
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if (stat(path, &stats) == 0)
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return S_ISDIR(stats.st_mode) ? 0 : -1;
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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 == 0) {
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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) < 0 && errno == ENOENT) {
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if (mkdir(dir, 0755) < 0) {
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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) < 0 || !S_ISDIR(stats.st_mode)) {
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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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