1 files changed, 54 insertions, 0 deletions
diff --git a/lib/src/rdline.c b/lib/src/rdline.c
new file mode 100644
index 0000000..591c713
--- /dev/null
+++ b/lib/src/rdline.c
@@ -0,0 +1,54 @@
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <ctype.h>
+
+#include "util.h"
+
+char *rdline(int fd)
+{
+	size_t i = 0, bufsiz = 0, newsz;
+	char c, *new, *buffer = NULL;
+	int ret;
+
+	for (;;) {
+		switch (read(fd, &c, 1)) {
+		case 0:
+			if (i == 0) {
+				errno = 0;
+				return NULL;
+			}
+			c = '\0';
+			break;
+		case 1:
+			if (c == '\n')
+				c = '\0';
+			break;
+		default:
+			if (errno == EINTR)
+				continue;
+			goto fail;
+		}
+
+		if (i == bufsiz) {
+			newsz = bufsiz ? bufsiz * 2 : 16;
+			new = realloc(buffer, newsz);
+
+			if (new == NULL)
+				goto fail;
+
+			buffer = new;
+			bufsiz = newsz;
+		}
+
+		buffer[i++] = c;
+		if (c == '\0')
+			break;
+	}
+	return buffer;
+fail:
+	ret = errno;
+	free(buffer);
+	errno = ret;
+	return NULL;
+}