1 files changed, 93 insertions, 0 deletions
diff --git a/lib/Utils/read_write.cpp b/lib/Utils/read_write.cpp
new file mode 100644
index 0000000..38907aa
--- /dev/null
+++ b/lib/Utils/read_write.cpp
@@ -0,0 +1,93 @@
+/*
+ * Utility routines.
+ *
+ * Licensed under GPLv2 or later, see file COPYING in this tarball for details.
+ */
+#include "abrtlib.h"
+
+ssize_t safe_read(int fd, void *buf, size_t count)
+{
+	ssize_t n;
+
+	do {
+		n = read(fd, buf, count);
+	} while (n < 0 && errno == EINTR);
+
+	return n;
+}
+
+ssize_t full_read(int fd, void *buf, size_t len)
+{
+	ssize_t cc;
+	ssize_t total;
+
+	total = 0;
+
+	while (len) {
+		cc = safe_read(fd, buf, len);
+
+		if (cc < 0) {
+			if (total) {
+				/* we already have some! */
+				/* user can do another read to know the error code */
+				return total;
+			}
+			return cc; /* read() returns -1 on failure. */
+		}
+		if (cc == 0)
+			break;
+		buf = ((char *)buf) + cc;
+		total += cc;
+		len -= cc;
+	}
+
+	return total;
+}
+
+/* Die with an error message if we can't read the entire buffer. */
+void xread(int fd, void *buf, size_t count)
+{
+	if (count) {
+		ssize_t size = full_read(fd, buf, count);
+		if ((size_t)size != count)
+			error_msg_and_die("short read");
+	}
+}
+
+ssize_t safe_write(int fd, const void *buf, size_t count)
+{
+	ssize_t n;
+
+	do {
+		n = write(fd, buf, count);
+	} while (n < 0 && errno == EINTR);
+
+	return n;
+}
+
+ssize_t full_write(int fd, const void *buf, size_t len)
+{
+	ssize_t cc;
+	ssize_t total;
+
+	total = 0;
+
+	while (len) {
+		cc = safe_write(fd, buf, len);
+
+		if (cc < 0) {
+			if (total) {
+				/* we already wrote some! */
+				/* user can do another write to know the error code */
+				return total;
+			}
+			return cc;	/* write() returns -1 on failure. */
+		}
+
+		total += cc;
+		buf = ((const char *)buf) + cc;
+		len -= cc;
+	}
+
+	return total;
+}