zeniba-nsxiv/util.c
Bert Münnich d3a70a285d Revised error handling
- Functions warn() and die() replaced by GNU-like error(3) function
- Register cleanup() with atexit(3)
- Functions called by cleanup() are marked with CLEANUP and are not allowed to
  call exit(3)
2015-10-28 23:03:37 +01:00

218 lines
4.3 KiB
C

/* 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/>.
*/
#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"
const char *progname;
void* emalloc(size_t size)
{
void *ptr;
ptr = malloc(size);
if (ptr == NULL)
error(EXIT_FAILURE, errno, NULL);
return ptr;
}
void* erealloc(void *ptr, size_t size)
{
ptr = realloc(ptr, size);
if (ptr == NULL)
error(EXIT_FAILURE, errno, NULL);
return ptr;
}
char* estrdup(const char *s)
{
char *d;
size_t n = strlen(s) + 1;
d = malloc(n);
if (d == NULL)
error(EXIT_FAILURE, errno, NULL);
memcpy(d, s, n);
return d;
}
void error(int eval, int err, const char* fmt, ...)
{
va_list ap;
fflush(stdout);
fprintf(stderr, "%s: ", progname);
va_start(ap, fmt);
if (fmt != NULL)
vfprintf(stderr, fmt, ap);
va_end(ap);
if (err != 0)
fprintf(stderr, "%s%s", fmt != NULL ? ": " : "", strerror(err));
fputc('\n', stderr);
if (eval != 0)
exit(eval);
}
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)];
}
int r_opendir(r_dir_t *rdir, const char *dirname)
{
if (*dirname == '\0')
return -1;
if ((rdir->dir = opendir(dirname)) == NULL) {
rdir->name = NULL;
rdir->stack = NULL;
return -1;
}
rdir->stcap = 512;
rdir->stack = (char**) emalloc(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->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) {
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;
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*) emalloc(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**) erealloc(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)
error(0, errno, "%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 == '\0')
return -1;
if (stat(path, &stats) == 0)
return S_ISDIR(stats.st_mode) ? 0 : -1;
d = dir = (char*) emalloc(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) {
error(0, errno, "%s", dir);
err = -1;
}
} else if (stat(dir, &stats) < 0 || !S_ISDIR(stats.st_mode)) {
err = -1;
}
if (d != NULL)
*d = '/';
}
free(dir);
return err;
}