1 files changed, 82 insertions, 0 deletions
diff --git a/ext/libelf/elf_errmsg.c b/ext/libelf/elf_errmsg.c
new file mode 100644
index 000000000..88607ebf4
--- /dev/null
+++ b/ext/libelf/elf_errmsg.c
@@ -0,0 +1,82 @@
+/*-
+ * Copyright (c) 2006 Joseph Koshy
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+
+#include <string.h>
+
+#include "_libelf.h"
+#include "libelf.h"
+
+/*
+ * Retrieve a human readable translation for an error message.
+ */
+
+const char *_libelf_errors[] = {
+#define	DEFINE_ERROR(N,S)	[ELF_E_##N] = S
+        DEFINE_ERROR(NONE,	"No Error"),
+        DEFINE_ERROR(ARCHIVE,	"Malformed ar(1) archive"),
+        DEFINE_ERROR(ARGUMENT,	"Invalid argument"),
+        DEFINE_ERROR(CLASS,	"ELF class mismatch"),
+        DEFINE_ERROR(DATA,	"Invalid data buffer descriptor"),
+        DEFINE_ERROR(HEADER,	"Missing or malformed ELF header"),
+        DEFINE_ERROR(IO,	"I/O error"),
+        DEFINE_ERROR(LAYOUT,	"Layout constraint violation"),
+        DEFINE_ERROR(MODE,	"Incorrect ELF descriptor mode"),
+        DEFINE_ERROR(RANGE,	"Value out of range of target"),
+        DEFINE_ERROR(RESOURCE,	"Resource exhaustion"),
+        DEFINE_ERROR(SECTION,	"Invalid section descriptor"),
+        DEFINE_ERROR(SEQUENCE,	"API calls out of sequence"),
+        DEFINE_ERROR(UNIMPL,	"Unimplemented feature"),
+        DEFINE_ERROR(VERSION,	"Unknown ELF API version"),
+        DEFINE_ERROR(NUM,	"Unknown error")
+#undef	DEFINE_ERROR
+};
+
+const char *
+elf_errmsg(int error)
+{
+        int oserr;
+
+        if (error == 0 && (error = LIBELF_PRIVATE(error)) == 0)
+            return NULL;
+        else if (error == -1)
+            error = LIBELF_PRIVATE(error);
+
+        oserr = error >> LIBELF_OS_ERROR_SHIFT;
+        error &= LIBELF_ELF_ERROR_MASK;
+
+        if (error < 0 || error >= ELF_E_NUM)
+                return _libelf_errors[ELF_E_NUM];
+        if (oserr) {
+                strlcpy(LIBELF_PRIVATE(msg), _libelf_errors[error],
+                    sizeof(LIBELF_PRIVATE(msg)));
+                strlcat(LIBELF_PRIVATE(msg), ": ", sizeof(LIBELF_PRIVATE(msg)));
+                strlcat(LIBELF_PRIVATE(msg), strerror(oserr),
+                    sizeof(LIBELF_PRIVATE(msg)));
+                return (const char *)&LIBELF_PRIVATE(msg);
+        }
+        return _libelf_errors[error];
+}