nsxiv/util.c

194 lines
3.9 KiB
C
Raw Normal View History

2011-02-03 10:15:01 +01:00
/* 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>
2011-02-14 17:51:04 +01:00
#include <string.h>
2011-04-07 14:33:57 +02:00
#include <unistd.h>
#include <errno.h>
2011-02-03 10:15:01 +01:00
#include "options.h"
#include "util.h"
2011-04-07 14:33:57 +02:00
#define FNAME_LEN 1024
2011-02-14 17:51:04 +01:00
2011-02-03 10:15:01 +01:00
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: ");
2011-02-03 10:54:31 +01:00
vfprintf(stderr, fmt, args);
2011-02-03 10:15:01 +01:00
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: ");
2011-02-03 10:54:31 +01:00
vfprintf(stderr, fmt, args);
2011-02-03 10:15:01 +01:00
fprintf(stderr, "\n");
va_end(args);
cleanup();
exit(1);
}
2011-02-03 14:32:02 +01:00
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)];
}
2011-02-14 17:51:04 +01:00
2011-04-07 14:33:57 +02:00
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");
2011-04-07 14:33:57 +02:00
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;
}
2011-02-14 17:51:04 +01:00
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));
2011-02-15 15:30:37 +01:00
if (ferror(stream)) {
s = NULL;
} else {
2011-02-14 17:51:04 +01:00
s = (char*) s_malloc((strlen(buf) + 1) * sizeof(char));
strcpy(s, buf);
}
free(buf);
return s;
}