1 files changed, 28 insertions, 0 deletions
diff --git a/drain.c b/drain.c
new file mode 100644
index 0000000..40c049e
--- /dev/null
+++ b/drain.c
@@ -0,0 +1,28 @@
+#include "drain.h"
+#include <stdlib.h>
+#include <string.h>
+
+char *drain(FILE *fp)
+{
+	size_t size = 1025;
+	char *buf = calloc(1025, 1);
+	if (buf == NULL) {
+		perror("drain");
+		return NULL;
+	}
+	/* Read until end of file. */
+	for (;;) {
+		if (fread(buf + size - 1025, 1024, 1, fp) != 1)
+			return buf;
+		/* Line is longer than 1024 bytes, realloc to make space. */
+		size += 1024;
+		char *new_buf = realloc(buf, size);
+		if (new_buf == NULL) {
+			perror("drain");
+			free(buf);
+			return NULL;
+		}
+		buf = new_buf;
+		memset(buf + size - 1024, 0, 1024);
+	}
+}