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#define _GNU_SOURCE
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "paths.h"
static char *mount_base;
struct device_map {
char *dev, *mnt;
};
#define DEVICE_MAP_SIZE 32
static struct device_map device_map[DEVICE_MAP_SIZE];
char *encode_label(const char *label)
{
char *str, *c;
int i;
/* the label can be expanded by up to four times */
str = malloc(strlen(label) * 4 + 1);
c = str;
for (i = 0; i < strlen(label); i++) {
if (label[i] == '/' || label[i] == '\\') {
sprintf(c, "\\x%02x", label[i]);
c += 4;
continue;
}
*(c++) = label[i];
}
*c = '\0';
return str;
}
char *parse_device_path(const char *dev_str, const char *cur_dev)
{
char *dev, tmp[256], *enc;
if (!strncasecmp(dev_str, "uuid=", 5)) {
asprintf(&dev, "/dev/disk/by-uuid/%s", dev_str + 5);
return dev;
}
if (!strncasecmp(dev_str, "label=", 6)) {
enc = encode_label(dev_str + 6);
asprintf(&dev, "/dev/disk/by-label/%s", enc);
free(enc);
return dev;
}
/* normalise '/dev/foo' to 'foo' for easy comparisons, we'll expand
* back before returning.
*/
if (!strncmp(dev_str, "/dev/", 5))
dev_str += 5;
/* PS3 hack: if we're reading from a ps3dx device, and we refer to
* a sdx device, remap to ps3dx */
if (cur_dev && !strncmp(cur_dev, "/dev/ps3d", 9)
&& !strncmp(dev_str, "sd", 2)) {
snprintf(tmp, 255, "ps3d%s", dev_str + 2);
dev_str = tmp;
}
return join_paths("/dev", dev_str);
}
const char *mountpoint_for_device(const char *dev)
{
int i;
if (!strncmp(dev, "/dev/", 5))
dev += 5;
/* check existing entries in the map */
for (i = 0; (i < DEVICE_MAP_SIZE) && device_map[i].dev; i++)
if (!strcmp(device_map[i].dev, dev))
return device_map[i].mnt;
if (i == DEVICE_MAP_SIZE)
return NULL;
device_map[i].dev = strdup(dev);
device_map[i].mnt = join_paths(mount_base, dev);
return device_map[i].mnt;
}
char *resolve_path(const char *path, const char *current_dev)
{
char *ret;
const char *devpath, *sep;
sep = strchr(path, ':');
if (!sep) {
devpath = mountpoint_for_device(current_dev);
ret = join_paths(devpath, path);
} else {
/* parse just the device name into dev */
char *tmp, *dev;
tmp = strndup(path, sep - path);
dev = parse_device_path(tmp, current_dev);
devpath = mountpoint_for_device(dev);
ret = join_paths(devpath, sep + 1);
free(dev);
free(tmp);
}
return ret;
}
void set_mount_base(const char *path)
{
if (mount_base)
free(mount_base);
mount_base = strdup(path);
}
char *join_paths(const char *a, const char *b)
{
char *full_path;
full_path = malloc(strlen(a) + strlen(b) + 2);
strcpy(full_path, a);
if (b[0] != '/' && a[strlen(a) - 1] != '/')
strcat(full_path, "/");
strcat(full_path, b);
return full_path;
}
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