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/* getmountlist.c - Get a linked list of mount points, with stat information.
*
* Copyright 2006 Rob Landley <rob@landley.net>
*/
#include "toys.h"
#include <mntent.h>
static void octal_deslash(char *s)
{
char *o = s;
while (*s) {
if (*s == '\\') {
int i, oct = 0;
for (i = 1; i < 4; i++) {
if (!isdigit(s[i])) break;
oct = (oct<<3)+s[i]-'0';
}
if (i == 4) {
*o++ = oct;
s += i;
continue;
}
}
*o++ = *s++;
}
*o = 0;
}
// Check if this type matches list.
// Odd syntax: typelist all yes = if any, typelist all no = if none.
int mountlist_istype(struct mtab_list *ml, char *typelist)
{
int len, skip;
char *t;
if (!typelist) return 1;
skip = strncmp(typelist, "no", 2);
for (;;) {
if (!(t = comma_iterate(&typelist, &len))) break;
if (!skip) {
// If one -t starts with "no", the rest must too
if (strncmp(t, "no", 2)) error_exit("bad typelist");
if (!strncmp(t+2, ml->type, len-2)) {
skip = 1;
break;
}
} else if (!strncmp(t, ml->type, len) && !ml->type[len]) {
skip = 0;
break;
}
}
return !skip;
}
// Get list of mounted filesystems, including stat and statvfs info.
// Returns a reversed list, which is good for finding overmounts and such.
struct mtab_list *xgetmountlist(char *path)
{
struct mtab_list *mtlist = 0, *mt;
struct mntent *me;
FILE *fp;
char *p = path ? path : "/proc/mounts";
if (!(fp = setmntent(p, "r"))) perror_exit("bad %s", p);
// The "test" part of the loop is done before the first time through and
// again after each "increment", so putting the actual load there avoids
// duplicating it. If the load was NULL, the loop stops.
while ((me = getmntent(fp))) {
mt = xzalloc(sizeof(struct mtab_list) + strlen(me->mnt_fsname) +
strlen(me->mnt_dir) + strlen(me->mnt_type) + strlen(me->mnt_opts) + 4);
dlist_add_nomalloc((void *)&mtlist, (void *)mt);
// Collect details about mounted filesystem
// Don't report errors, just leave data zeroed
if (!path) {
stat(me->mnt_dir, &(mt->stat));
statvfs(me->mnt_dir, &(mt->statvfs));
}
// Remember information from /proc/mounts
mt->dir = stpcpy(mt->type, me->mnt_type)+1;
mt->device = stpcpy(mt->dir, me->mnt_dir)+1;
mt->opts = stpcpy(mt->device, me->mnt_fsname)+1;
strcpy(mt->opts, me->mnt_opts);
octal_deslash(mt->dir);
octal_deslash(mt->device);
}
endmntent(fp);
return mtlist;
}
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