Move NFS mount code from util-linux to nfs-utils - part 2

[nfs-utils.git] / support / nfs / xcommon.c

diff --git a/support/nfs/xcommon.c b/support/nfs/xcommon.c
new file mode 100644 (file)
index 0000000..d862a07
--- /dev/null
+++ b/support/nfs/xcommon.c
@@ -0,0 +1,185 @@
+/*
+ * xcommon.c - various functions put together to avoid basic error checking.
+ *
+ * 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
+ *
+ * 2006-06-06 Amit Gud <agud@redhat.com>
+ * - Moved code snippets here from mount/sundries.c of util-linux
+ *   and merged code from support/nfs/xmalloc.c by Olaf Kirch <okir@monad.swb.de> here.
+ */
+
+#include <unistd.h>
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "xcommon.h"
+#include "nls.h"       /* _() */
+
+void (*at_die)(void ) = NULL;
+
+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;
+}
+
+/* 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
+nfs_error (const char *fmt, ...) {
+     va_list args;
+     char *fmt2;
+
+     fmt2 = xstrconcat2 (fmt, "\n");
+     va_start (args, fmt);
+     vfprintf (stderr, fmt2, args);
+     va_end (args);
+     free (fmt2);
+}
+
+/* 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 (realpath (path, canonical))
+               return xstrdup(canonical);
+
+       return xstrdup(path);
+}
+
+/* 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);
+
+       if (at_die)
+               (*at_die)();
+
+       exit(err);
+}
+
+static void
+die_if_null(void *t) {
+       if (t == NULL)
+               die(EX_SYSERR, _("not enough memory"));
+}
+
+void *
+xmalloc (size_t size) {
+       void *t;
+
+       if (size == 0)
+               return NULL;
+
+       t = malloc(size);
+       die_if_null(t);
+
+       return t;
+}
+
+void *
+xrealloc (void *p, size_t size) {
+       void *t;
+
+       t = realloc(p, size);
+       die_if_null(t);
+
+       return t;
+}
+
+void
+xfree(void *ptr)
+{
+       free(ptr);
+}
+
+char *
+xstrdup (const char *s) {
+       char *t;
+
+       if (s == NULL)
+               return NULL;
+
+       t = strdup(s);
+       die_if_null(t);
+
+       return t;
+}