add a configure script and some compat

tested on openbsd, alpine and void

1 files changed, 84 insertions, 0 deletions

diff --git a/compat/err.c b/compat/err.c
new file mode 100644
index 0000000..840acd0
--- /dev/null
+++ b/compat/err.c
@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdarg.h>
+
+/* cheat: if we don't have getprogname in stdlib, will link against
+ * compat/getprogname.c anyway. */
+const char *getprogname(void);
+
+static void vwarn_impl(const char*, va_list);
+static void vwarnx_impl(const char*, va_list);
+
+static void
+vwarn_impl(const char *fmt, va_list ap)
+{
+	fprintf(stderr, "%s: ", getprogname());
+	vfprintf(stderr, fmt, ap);
+	fprintf(stderr, ": %s\n", strerror(errno));
+}
+
+static void
+vwarnx_impl(const char *fmt, va_list ap)
+{
+	fprintf(stderr, "%s: ", getprogname());
+	vfprintf(stderr, fmt, ap);
+	fprintf(stderr, "\n");
+}
+
+void
+err(int ret, const char *fmt, ...)
+{
+	va_list	ap;
+
+	va_start(ap, fmt);
+	vwarn_impl(fmt, va);
+	va_end(ap, fmt);
+	exit(ret);
+}
+
+void
+errx(int ret, const char *fmt, ...)
+{
+	va_list	ap;
+
+	va_start(ap, fmt);
+	vwarnx_impl(fmt, va);
+	va_end(ap, fmt);
+	exit(ret);
+}
+
+void
+warn(const char *fmt, ...)
+{
+	va_list	ap;
+
+	va_start(ap, fmt);
+	vwarn_impl(fmt, va);
+	va_end(ap, fmt);
+}
+
+void
+warnx(const char *fmt, ...)
+{
+	va_list	ap;
+
+	va_start(ap, fmt);
+	vwarnx_impl(fmt, va);
+	va_end(ap, fmt);
+}