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/*
* Support functions. Exported functions are prototyped in sundries.h.
* sundries.c,v 1.1.1.1 1993/11/18 08:40:51 jrs Exp
*
* added fcntl locking by Kjetil T. (kjetilho@math.uio.no) - aeb, 950927
*/
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <mntent.h> /* for MNTTYPE_SWAP */
#include "fstab.h"
#include "sundries.h"
#include "nfsmount.h"
/* String list constructor. (car() and cdr() are defined in "sundries.h"). */
string_list
cons (char *a, const string_list b) {
string_list p;
p = xmalloc (sizeof *p);
car (p) = a;
cdr (p) = b;
return p;
}
void *
xmalloc (size_t size) {
void *t;
if (size == 0)
return NULL;
t = malloc (size);
if (t == NULL)
die (EX_SYSERR, "not enough memory");
return t;
}
char *
xstrdup (const char *s) {
char *t;
if (s == NULL)
return NULL;
t = strdup (s);
if (t == NULL)
die (EX_SYSERR, "not enough memory");
return t;
}
char *
xstrndup (const char *s, int n) {
char *t;
if (s == NULL)
die (EX_SOFTWARE, "bug in xstrndup call");
t = xmalloc(n+1);
strncpy(t,s,n);
t[n] = 0;
return t;
}
char *
xstrconcat2 (const char *s, const char *t) {
char *res;
if (!s) s = "";
if (!t) t = "";
res = xmalloc(strlen(s) + strlen(t) + 1);
strcpy(res, s);
strcat(res, t);
return res;
}
char *
xstrconcat3 (const char *s, const char *t, const char *u) {
char *res;
if (!s) s = "";
if (!t) t = "";
if (!u) u = "";
res = xmalloc(strlen(s) + strlen(t) + strlen(u) + 1);
strcpy(res, s);
strcat(res, t);
strcat(res, u);
return res;
}
char *
xstrconcat4 (const char *s, const char *t, const char *u, const char *v) {
char *res;
if (!s) s = "";
if (!t) t = "";
if (!u) u = "";
if (!v) v = "";
res = xmalloc(strlen(s) + strlen(t) + strlen(u) + strlen(v) + 1);
strcpy(res, s);
strcat(res, t);
strcat(res, u);
strcat(res, v);
return res;
}
/* Call this with SIG_BLOCK to block and SIG_UNBLOCK to unblock. */
void
block_signals (int how) {
sigset_t sigs;
sigfillset (&sigs);
sigdelset(&sigs, SIGTRAP);
sigdelset(&sigs, SIGSEGV);
sigprocmask (how, &sigs, (sigset_t *) 0);
}
/* Non-fatal error. Print message and return. */
/* (print the message in a single printf, in an attempt
to avoid mixing output of several threads) */
void
error (const char *fmt, ...) {
va_list args;
char *fmt2;
if (mount_quiet)
return;
fmt2 = xstrconcat2 (fmt, "\n");
va_start (args, fmt);
vfprintf (stderr, fmt2, args);
va_end (args);
free (fmt2);
}
/* Fatal error. Print message and exit. */
void
die (int err, const char *fmt, ...) {
va_list args;
va_start (args, fmt);
vfprintf (stderr, fmt, args);
fprintf (stderr, "\n");
va_end (args);
unlock_mtab ();
exit (err);
}
/* Parse a list of strings like str[,str]... into a string list. */
string_list
parse_list (char *strings) {
string_list list;
char *t;
if (strings == NULL)
return NULL;
list = cons (strtok (strings, ","), NULL);
while ((t = strtok (NULL, ",")) != NULL)
list = cons (t, list);
return list;
}
/* True if fstypes match. Null *TYPES means match anything,
except that swap types always return false.
This routine has some ugliness to deal with ``no'' types.
Fixed bug: the `no' part comes at the end - aeb, 970216 */
int
matching_type (const char *type, string_list types) {
char *notype;
int foundyes, foundno;
int no; /* true if a "no" type match, eg -t nominix */
if (streq (type, MNTTYPE_SWAP))
return 0;
if (types == NULL)
return 1;
if ((notype = alloca (strlen (type) + 3)) == NULL)
die (EX_SYSERR, "mount: out of memory");
sprintf (notype, "no%s", type);
foundyes = foundno = no = 0;
while (types != NULL) {
if (cdr (types) == NULL)
no = (car (types)[0] == 'n') && (car (types)[1] == 'o');
if (streq (type, car (types)))
foundyes = 1;
else if (streq (notype, car (types)))
foundno = 1;
types = cdr (types);
}
return (foundno ? 0 : (no ^ foundyes));
}
/* Make a canonical pathname from PATH. Returns a freshly malloced string.
It is up the *caller* to ensure that the PATH is sensible. i.e.
canonicalize ("/dev/fd0/.") returns "/dev/fd0" even though ``/dev/fd0/.''
is not a legal pathname for ``/dev/fd0''. Anything we cannot parse
we return unmodified. */
char *
canonicalize (const char *path) {
char *canonical;
if (path == NULL)
return NULL;
if (streq(path, "none") || streq(path, "proc"))
return xstrdup(path);
canonical = xmalloc (PATH_MAX + 1);
if (realpath (path, canonical))
return canonical;
free(canonical);
return xstrdup(path);
}
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