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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
*
* 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@pld.ORG.PL>
* - added Native Language Support
*
*/
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <mntent.h> /* for MNTTYPE_SWAP */
#include "fstab.h"
#include "sundries.h"
#include "realpath.h"
#include "nfsmount.h"
#include "nls.h"
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;
}
/* frees its first arg - typical use: s = xstrconcat3(s,t,u); */
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);
free((void *) s);
return res;
}
/* frees its first arg - typical use: s = xstrconcat4(s,t,u,v); */
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);
free((void *) s);
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);
}
/* True if fstypes match. Null *TYPES means match anything,
except that swap types always return false. */
/* Accept nonfs,proc,devpts and nonfs,noproc,nodevpts
with the same meaning. */
int
matching_type (const char *type, const char *types) {
int no; /* negated types list */
int len;
const char *p;
if (streq (type, MNTTYPE_SWAP))
return 0;
if (types == NULL)
return 1;
no = 0;
if (!strncmp(types, "no", 2)) {
no = 1;
types += 2;
}
/* Does type occur in types, separated by commas? */
len = strlen(type);
p = types;
while(1) {
if (!strncmp(p, "no", 2) && !strncmp(p+2, type, len) &&
(p[len+2] == 0 || p[len+2] == ','))
return 0;
if (strncmp(p, type, len) == 0 &&
(p[len] == 0 || p[len] == ','))
return !no;
p = index(p,',');
if (!p)
break;
p++;
}
return no;
}
/* Returns 1 if needle found or noneedle not found in haystack
* Otherwise returns 0
*/
static int
check_option(const char *haystack, const char *needle) {
const char *p, *r;
int len, needle_len, this_len;
int no;
no = 0;
if (!strncmp(needle, "no", 2)) {
no = 1;
needle += 2;
}
needle_len = strlen(needle);
len = strlen(haystack);
for (p = haystack; p < haystack+len; p++) {
r = strchr(p, ',');
if (r) {
this_len = r-p;
} else {
this_len = strlen(p);
}
if (this_len != needle_len) {
p += this_len;
continue;
}
if (strncmp(p, needle, this_len) == 0)
return !no; /* foo or nofoo was found */
p += this_len;
}
return no; /* foo or nofoo was not found */
}
/* Returns 1 if each of the test_opts options agrees with the entire
* list of options.
* Returns 0 if any noopt is found in test_opts and opt is found in options.
* Returns 0 if any opt is found in test_opts but is not found in options.
* Unlike fs type matching, nonetdev,user and nonetdev,nouser have
* DIFFERENT meanings; each option is matched explicitly as specified.
*/
int
matching_opts (const char *options, const char *test_opts) {
const char *p, *r;
char *q;
int len, this_len;
if (test_opts == NULL)
return 1;
len = strlen(test_opts);
q = alloca(len+1);
if (q == NULL)
die (EX_SYSERR, _("not enough memory"));
for (p = test_opts; p < test_opts+len; p++) {
r = strchr(p, ',');
if (r) {
this_len = r-p;
} else {
this_len = strlen(p);
}
if (!this_len) continue; /* if two ',' appear in a row */
strncpy(q, p, this_len);
q[this_len] = '\0';
if (!check_option(options, q))
return 0; /* any match failure means failure */
p += this_len;
}
/* no match failures in list means success */
return 1;
}
/* 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[PATH_MAX+2];
if (path == NULL)
return NULL;
#if 1
if (streq(path, "none") ||
streq(path, "proc") ||
streq(path, "devpts"))
return xstrdup(path);
#endif
if (myrealpath (path, canonical, PATH_MAX+1))
return xstrdup(canonical);
return xstrdup(path);
}
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