[PATCH 2/3] util: add xtalloc.[ch]

[david@tethera.net]

From: David Bremner <bremner@debian.org>

These are intended to be simple wrappers to provide slightly better
debugging information than what talloc currently provides natively.
---
 notmuch-client.h    |    2 +-
 util/Makefile.local |    2 +-
 util/xtalloc.c      |   15 +++++++++++++++
 util/xtalloc.h      |   18 ++++++++++++++++++
 4 files changed, 35 insertions(+), 2 deletions(-)
 create mode 100644 util/xtalloc.c
 create mode 100644 util/xtalloc.h

diff --git a/notmuch-client.h b/notmuch-client.h
index d7b352e..60be030 100644
--- a/notmuch-client.h
+++ b/notmuch-client.h
@@ -58,7 +58,7 @@ typedef GMimeCipherContext notmuch_crypto_context_t;
 #include <errno.h>
 #include <signal.h>
 
-#include <talloc.h>
+#include "xtalloc.h"
 
 #define unused(x) x __attribute__ ((unused))
 
diff --git a/util/Makefile.local b/util/Makefile.local
index a11e35b..8a62c00 100644
--- a/util/Makefile.local
+++ b/util/Makefile.local
@@ -4,7 +4,7 @@ dir := util
 extra_cflags += -I$(srcdir)/$(dir)
 
 libutil_c_srcs := $(dir)/xutil.c $(dir)/error_util.c $(dir)/hex-escape.c \
-		  $(dir)/string-util.c
+		  $(dir)/string-util.c $(dir)/xtalloc.c
 
 libutil_modules := $(libutil_c_srcs:.c=.o)
 
diff --git a/util/xtalloc.c b/util/xtalloc.c
new file mode 100644
index 0000000..22834bd
--- /dev/null
+++ b/util/xtalloc.c
@@ -0,0 +1,15 @@
+#include <string.h>
+#include "xtalloc.h"
+
+char *
+xtalloc_strndup_named_const (void *ctx, const char *str,
+			     size_t len, const char *name)
+{
+    char *ptr = talloc_named_const (ctx, len + 1, name);
+
+    if (ptr) {
+	memcpy (ptr, str, len);
+	*(ptr + len) = '\0';
+    }
+    return ptr;
+}
diff --git a/util/xtalloc.h b/util/xtalloc.h
new file mode 100644
index 0000000..3cc1179
--- /dev/null
+++ b/util/xtalloc.h
@@ -0,0 +1,18 @@
+#ifndef _XTALLOC_H
+#define _XTALLOC_H
+
+#include <talloc.h>
+
+/* Like talloc_strndup, but take an extra parameter for the internal talloc
+ * name (for debugging) */
+
+char *
+xtalloc_strndup_named_const (void *ctx, const char *str,
+			     size_t len, const char *name);
+
+/* use the __location__ macro from talloc.h to name a string according to its
+ * source location */
+
+#define xtalloc_strndup(ctx, str, len) xtalloc_strndup_named_const (ctx, str, len, __location__)
+
+#endif
-- 
1.7.10.4