[PATCH 1/2] Introduce xasprintf

Dmitry V. Levin ldv@altlinux.org
Mon Sep 6 10:00:00 GMT 2021


Similar to other x* functions, xasprintf is like asprintf except that
it dies in case of an error.

Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
---
 lib/ChangeLog   |  6 ++++++
 lib/Makefile.am |  2 +-
 lib/libeu.h     |  2 ++
 lib/xasprintf.c | 52 +++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 61 insertions(+), 1 deletion(-)
 create mode 100644 lib/xasprintf.c

diff --git a/lib/ChangeLog b/lib/ChangeLog
index 60d32082..59d1d51c 100644
--- a/lib/ChangeLog
+++ b/lib/ChangeLog
@@ -1,3 +1,9 @@
+2021-09-06  Dmitry V. Levin  <ldv@altlinux.org>
+
+	* xasprintf.c: New file.
+	* Makefile.am (libeu_a_SOURCES): Add it.
+	* libeu.h (xasprintf): New prototype.
+
 2021-08-23  Saleem Abdulrasool  <abdulras@google.com>
 
 	* system.h: Remove inline definition for error and error_message_count
diff --git a/lib/Makefile.am b/lib/Makefile.am
index 766fbcd7..42ddf5ae 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -33,7 +33,7 @@ AM_CPPFLAGS += -I$(srcdir)/../libelf
 
 noinst_LIBRARIES = libeu.a
 
-libeu_a_SOURCES = xstrdup.c xstrndup.c xmalloc.c next_prime.c \
+libeu_a_SOURCES = xasprintf.c xstrdup.c xstrndup.c xmalloc.c next_prime.c \
 		  crc32.c crc32_file.c \
 		  color.c error.c printversion.c
 
diff --git a/lib/libeu.h b/lib/libeu.h
index ecb4d011..e849a79e 100644
--- a/lib/libeu.h
+++ b/lib/libeu.h
@@ -39,6 +39,8 @@ extern void *xrealloc (void *, size_t) __attribute__ ((__malloc__));
 extern char *xstrdup (const char *) __attribute__ ((__malloc__));
 extern char *xstrndup (const char *, size_t) __attribute__ ((__malloc__));
 
+extern char *xasprintf(const char *fmt, ...)
+	__attribute__ ((format (printf, 1, 2))) __attribute__ ((__malloc__));
 
 extern uint32_t crc32 (uint32_t crc, unsigned char *buf, size_t len);
 extern int crc32_file (int fd, uint32_t *resp);
diff --git a/lib/xasprintf.c b/lib/xasprintf.c
new file mode 100644
index 00000000..179ea2e8
--- /dev/null
+++ b/lib/xasprintf.c
@@ -0,0 +1,52 @@
+/* A wrapper around vasprintf that dies in case of an error.
+   Copyright (c) 2021 Dmitry V. Levin <ldv@altlinux.org>
+   This file is part of elfutils.
+
+   This file is free software; you can redistribute it and/or modify
+   it under the terms of either
+
+     * the GNU Lesser General Public License as published by the Free
+       Software Foundation; either version 3 of the License, or (at
+       your option) any later version
+
+   or
+
+     * the GNU General Public License as published by the Free
+       Software Foundation; either version 2 of the License, or (at
+       your option) any later version
+
+   or both in parallel, as here.
+
+   elfutils 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 copies of the GNU General Public License and
+   the GNU Lesser General Public License along with this program.  If
+   not, see <http://www.gnu.org/licenses/>.  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <libintl.h>
+#include "libeu.h"
+#include "system.h"
+
+char *
+xasprintf (const char *fmt, ...)
+{
+  char *res;
+  va_list ap;
+
+  va_start (ap, fmt);
+  if (unlikely (vasprintf (&res, fmt, ap) < 0))
+    error (EXIT_FAILURE, 0, _("memory exhausted"));
+  va_end(ap);
+
+  return res;
+}
-- 
ldv


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