1 files changed, 174 insertions, 0 deletions
diff --git a/src/shared/helpers.h b/src/shared/helpers.h
new file mode 100644
index 00000000..44d76552
--- /dev/null
+++ b/src/shared/helpers.h
@@ -0,0 +1,174 @@
+/*
+ * helpers.h
+ * This is private to us and not for user consumption
+ */
+
+/*
+ * Copyright (c) 2007-2015 The OpenRC Authors.
+ * See the Authors file at the top-level directory of this distribution and
+ * https://github.com/OpenRC/openrc/blob/HEAD/AUTHORS
+ *
+ * This file is part of OpenRC. It is subject to the license terms in
+ * the LICENSE file found in the top-level directory of this
+ * distribution and at https://github.com/OpenRC/openrc/blob/HEAD/LICENSE
+ * This file may not be copied, modified, propagated, or distributed
+ *    except according to the terms contained in the LICENSE file.
+ */
+
+#ifndef __HELPERS_H__
+#define __HELPERS_H__
+
+#define ERRX fprintf (stderr, "out of memory\n"); exit (1)
+
+#define UNCONST(a)		((void *)(unsigned long)(const void *)(a))
+
+#ifdef lint
+# define _unused
+#endif
+#if __GNUC__ > 2 || defined(__INTEL_COMPILER)
+# define _dead __attribute__((__noreturn__))
+# define _unused __attribute__((__unused__))
+# define _xasprintf(a, b)  __attribute__((__format__(__printf__, a, b)))
+#else
+# define _dead
+# define _unused
+# define _xasprintf(a, b)
+#endif
+
+#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
+
+#ifdef __GLIBC__
+#  if !defined (__UCLIBC__) && !defined (__dietlibc__)
+#    define strlcpy(dst, src, size) snprintf(dst, size, "%s", src)
+#  endif
+#endif
+
+#ifndef timespecsub
+#define	timespecsub(tsp, usp, vsp)					      \
+	do {								      \
+		(vsp)->tv_sec = (tsp)->tv_sec - (usp)->tv_sec;		      \
+		(vsp)->tv_nsec = (tsp)->tv_nsec - (usp)->tv_nsec;	      \
+		if ((vsp)->tv_nsec < 0) {				      \
+			(vsp)->tv_sec--;				      \
+			(vsp)->tv_nsec += 1000000000L;			      \
+		}							      \
+	} while (/* CONSTCOND */ 0)
+#endif
+
+#include <stdarg.h>
+#include <stdbool.h>
+#include <sys/stat.h>
+
+_unused static void *xmalloc (size_t size)
+{
+	void *value = malloc(size);
+
+	if (value)
+		return (value);
+
+	ERRX;
+	/* NOTREACHED */
+}
+
+_unused static void *xrealloc(void *ptr, size_t size)
+{
+	void *value = realloc(ptr, size);
+
+	if (value)
+		return (value);
+
+	ERRX;
+	/* NOTREACHED */
+}
+
+_unused static char *xstrdup(const char *str)
+{
+	char *value;
+
+	if (!str)
+		return (NULL);
+
+	value = strdup(str);
+
+	if (value)
+		return (value);
+
+	ERRX;
+	/* NOTREACHED */
+}
+
+#undef ERRX
+
+/*
+ * basename_c never modifies the argument. As such, if there is a trailing
+ * slash then an empty string is returned.
+ */
+_unused static const char *basename_c(const char *path)
+{
+	const char *slash = strrchr(path, '/');
+
+	if (slash)
+		return (++slash);
+	return (path);
+}
+
+_unused static bool exists(const char *pathname)
+{
+	struct stat buf;
+
+	return (stat(pathname, &buf) == 0);
+}
+
+_unused static bool existss(const char *pathname)
+{
+	struct stat buf;
+
+	return (stat(pathname, &buf) == 0 && buf.st_size != 0);
+}
+
+/*
+ * This is an OpenRC specific version of the asprintf() function.
+ * We do this to avoid defining the _GNU_SOURCE feature test macro on
+ * glibc systems and to insure that we have a consistent function across
+ * platforms. This also allows us to call our xmalloc and xrealloc
+ * functions to handle memory allocation.
+ * this function was originally written by Mike Frysinger.
+ */
+_unused _xasprintf(2,3) static int xasprintf(char **strp, const char *fmt, ...)
+{
+	va_list ap;
+	int len;
+	int memlen;
+	char *ret;
+
+	/*
+	 * Start with a buffer size that should cover the vast majority of uses
+	 * (path construction).
+	 */
+	memlen = 4096;
+	ret = xmalloc(memlen);
+
+	va_start(ap, fmt);
+	len = vsnprintf(ret, memlen, fmt, ap);
+	va_end(ap);
+	if (len >= memlen) {
+		/*
+		 * Output was truncated, so increase buffer to exactly what we need.
+		 */
+		memlen = len + 1;
+		ret = xrealloc(ret, memlen);
+		va_start(ap, fmt);
+		len = vsnprintf(ret, len + 1, fmt, ap);
+		va_end(ap);
+	}
+	if (len < 0 || len >= memlen) {
+		/* Give up! */
+		fprintf(stderr, "xasprintf: unable to format a buffer\n");
+		free(ret);
+		exit(1);
+	}
+	*strp = ret;
+	return len;
+}
+
+#endif