lib: Split up huge src/guestfs.c into logical compilation units.

This file had grown by accretion to include:

 - code related to handles (now in src/handle.c)

 - safe allocation (src/alloc.c)

 - debug, errors, warnings (src/errors.c)

 - private data (src/private-data.c)

 - miscellaneous functions (src/canonical-name.c, src/utils.c)

This commit also removes about a dozen #include files which were
probably not really used.

This is just code motion.

1 files changed, 124 insertions, 0 deletions

diff --git a/src/alloc.c b/src/alloc.c
new file mode 100644
index 00000000..dc64bbd8
--- /dev/null
+++ b/src/alloc.c
@@ -0,0 +1,124 @@
+/* libguestfs
+ * Copyright (C) 2009-2012 Red Hat Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+
+#include "guestfs.h"
+#include "guestfs-internal.h"
+
+void *
+guestfs_safe_malloc (guestfs_h *g, size_t nbytes)
+{
+  void *ptr = malloc (nbytes);
+  if (nbytes > 0 && !ptr) g->abort_cb ();
+  return ptr;
+}
+
+/* Return 1 if an array of N objects, each of size S, cannot exist due
+   to size arithmetic overflow.  S must be positive and N must be
+   nonnegative.  This is a macro, not an inline function, so that it
+   works correctly even when SIZE_MAX < N.
+
+   By gnulib convention, SIZE_MAX represents overflow in size
+   calculations, so the conservative dividend to use here is
+   SIZE_MAX - 1, since SIZE_MAX might represent an overflowed value.
+   However, malloc (SIZE_MAX) fails on all known hosts where
+   sizeof (ptrdiff_t) <= sizeof (size_t), so do not bother to test for
+   exactly-SIZE_MAX allocations on such hosts; this avoids a test and
+   branch when S is known to be 1.  */
+# define xalloc_oversized(n, s) \
+    ((size_t) (sizeof (ptrdiff_t) <= sizeof (size_t) ? -1 : -2) / (s) < (n))
+
+/* Technically we should add an autoconf test for this, testing for the desired
+   functionality, like what's done in gnulib, but for now, this is fine.  */
+#if defined(__GLIBC__)
+#define HAVE_GNU_CALLOC (__GLIBC__ >= 2)
+#else
+#define HAVE_GNU_CALLOC 0
+#endif
+
+/* Allocate zeroed memory for N elements of S bytes, with error
+   checking.  S must be nonzero.  */
+void *
+guestfs_safe_calloc (guestfs_h *g, size_t n, size_t s)
+{
+  /* From gnulib's calloc function in xmalloc.c.  */
+  void *p;
+  /* Test for overflow, since some calloc implementations don't have
+     proper overflow checks.  But omit overflow and size-zero tests if
+     HAVE_GNU_CALLOC, since GNU calloc catches overflow and never
+     returns NULL if successful.  */
+  if ((! HAVE_GNU_CALLOC && xalloc_oversized (n, s))
+      || (! (p = calloc (n, s)) && (HAVE_GNU_CALLOC || n != 0)))
+    g->abort_cb ();
+  return p;
+}
+
+void *
+guestfs_safe_realloc (guestfs_h *g, void *ptr, size_t nbytes)
+{
+  void *p = realloc (ptr, nbytes);
+  if (nbytes > 0 && !p) g->abort_cb ();
+  return p;
+}
+
+char *
+guestfs_safe_strdup (guestfs_h *g, const char *str)
+{
+  char *s = strdup (str);
+  if (!s) g->abort_cb ();
+  return s;
+}
+
+char *
+guestfs_safe_strndup (guestfs_h *g, const char *str, size_t n)
+{
+  char *s = strndup (str, n);
+  if (!s) g->abort_cb ();
+  return s;
+}
+
+void *
+guestfs_safe_memdup (guestfs_h *g, const void *ptr, size_t size)
+{
+  void *p = malloc (size);
+  if (!p) g->abort_cb ();
+  memcpy (p, ptr, size);
+  return p;
+}
+
+char *
+guestfs_safe_asprintf (guestfs_h *g, const char *fs, ...)
+{
+  va_list args;
+  char *msg;
+
+  va_start (args, fs);
+  int err = vasprintf (&msg, fs, args);
+  va_end (args);
+
+  if (err == -1)
+    g->abort_cb ();
+
+  return msg;
+}