include err.h shim

Includes compatible replacements, or uses system err.h if available.

ok beck@ guenther@

2 files changed, 26 insertions, 1 deletions

diff --git a/include/Makefile.am b/include/Makefile.am
index 7f8cfbd..889f775 100644
--- a/include/Makefile.am
+++ b/include/Makefile.am
@@ -1,6 +1,7 @@
 SUBDIRS = openssl
 
-noinst_HEADERS = pqueue.h
+noinst_HEADERS = err.h
+noinst_HEADERS += pqueue.h
 noinst_HEADERS += stdlib.h
 noinst_HEADERS += string.h
 noinst_HEADERS += unistd.h
diff --git a/include/err.h b/include/err.h
new file mode 100644
index 0000000..0aba1db
--- /dev/null
+++ b/include/err.h
@@ -0,0 +1,24 @@
+#ifdef HAVE_ERR_H
+
+#include_next <err.h>
+
+#else
+
+#ifndef LIBCRYPTOCOMPAT_ERR_H
+#define LIBCRYPTOCOMPAT_ERR_H
+
+#define err(exitcode, format, args...) \
+  errx(exitcode, format ": %s", ## args, strerror(errno))
+
+#define errx(exitcode, format, args...) \
+  do { warnx(format, ## args); exit(exitcode); } while (0)
+
+#define warn(format, args...) \
+  warnx(format ": %s", ## args, strerror(errno))
+
+#define warnx(format, args...) \
+  fprintf(stderr, format "\n", ## args)
+
+#endif
+
+#endif