Modernize the build system.

[tinc] / src / xmalloc.c

diff --git a/src/xmalloc.c b/src/xmalloc.c
new file mode 100644 (file)
index 0000000..1e40017
--- /dev/null
+++ b/src/xmalloc.c
@@ -0,0 +1,164 @@
+/* xmalloc.c -- malloc with out of memory checking
+   Copyright (C) 1990, 91, 92, 93, 94, 95, 96, 97 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License along
+   with this program; if not, write to the Free Software Foundation, Inc., Foundation,
+   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.  */
+
+#if HAVE_CONFIG_H
+# include "../config.h"
+#endif
+
+#include <sys/types.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdarg.h>
+#include <errno.h>
+
+#if STDC_HEADERS
+# include <stdlib.h>
+#else
+void *calloc ();
+void *malloc ();
+void *realloc ();
+void free ();
+#endif
+
+#include "dropin.h"
+#include "xalloc.h"
+
+#ifndef EXIT_FAILURE
+# define EXIT_FAILURE 1
+#endif
+
+/* Prototypes for functions defined here.  */
+#if defined (__STDC__) && __STDC__
+void *xmalloc (size_t n);
+void *xcalloc (size_t n, size_t s);
+void *xrealloc (void *p, size_t n);
+#endif
+
+/* Exit value when the requested amount of memory is not available.
+   The caller may set it to some other value.  */
+int xalloc_exit_failure = EXIT_FAILURE;
+
+/* FIXME: describe */
+char *const xalloc_msg_memory_exhausted = "Memory exhausted";
+
+/* FIXME: describe */
+void (*xalloc_fail_func) (int) = NULL;
+
+static void
+xalloc_fail (int size)
+{
+  if (xalloc_fail_func)
+    (*xalloc_fail_func) (size);
+  fprintf(stderr, "%s\n", xalloc_msg_memory_exhausted);
+  exit(xalloc_exit_failure);
+}
+
+/* Allocate N bytes of memory dynamically, with error checking.  */
+
+void *
+xmalloc (size_t n)
+{
+  void *p;
+
+  p = malloc (n);
+  if (p == NULL)
+    xalloc_fail ((int)n);
+  return p;
+}
+
+/* Allocate N bytes of memory dynamically, and set it all to zero. */
+
+void *
+xmalloc_and_zero (size_t n)
+{
+  void *p;
+
+  p = malloc (n);
+  if (p == NULL)
+    xalloc_fail ((int)n);
+  memset (p, '\0', n);
+  return p;
+}
+
+/* Change the size of an allocated block of memory P to N bytes,
+   with error checking.
+   If P is NULL, run xmalloc.  */
+
+void *
+xrealloc (void *p, size_t n)
+{
+  p = realloc (p, n);
+  if (p == NULL)
+    xalloc_fail (n);
+  return p;
+}
+
+/* Duplicate a string */
+
+char *xstrdup(const char *s)
+{
+  char *p;
+  
+  p = strdup(s);
+  if(!p)
+    xalloc_fail ((int)strlen(s));
+  return p;
+}
+
+#ifdef NOT_USED
+
+/* Allocate memory for N elements of S bytes, with error checking.  */
+
+void *
+xcalloc (n, s)
+     size_t n, s;
+{
+  void *p;
+
+  p = calloc (n, s);
+  if (p == NULL)
+    xalloc_fail ();
+  return p;
+}
+
+#endif /* NOT_USED */
+
+int xasprintf(char **strp, const char *fmt, ...) {
+       int result;
+       va_list ap;
+       va_start(ap, fmt);
+       result = xvasprintf(strp, fmt, ap);
+       va_end(ap);
+       return result;
+}
+
+int xvasprintf(char **strp, const char *fmt, va_list ap) {
+#ifdef HAVE_MINGW
+       char buf[1024];
+       int result = vsnprintf(buf, sizeof buf, fmt, ap);
+       if(result < 0)
+               exit(xalloc_exit_failure);
+       *strp = xstrdup(buf);
+#else
+       int result = vasprintf(strp, fmt, ap);
+       if(result < 0) {
+               fprintf(stderr, "vasprintf() failed: %s\n", strerror(errno));
+               exit(xalloc_exit_failure);
+       }
+#endif
+       return result;
+}