1 files changed, 29 insertions, 0 deletions
diff --git a/src/drain.h b/src/drain.h
new file mode 100644
index 0000000..d0f1111
--- /dev/null
+++ b/src/drain.h
@@ -0,0 +1,29 @@
+#pragma once
+#include <stdio.h>
+#include <stdlib.h>
+
+static char *
+drain(FILE *fp, long *size)
+{
+	if (fseek(fp, 0, SEEK_END) < 0) {
+		perror("drain:SEEK_END");
+		return NULL;
+	}
+	*size = ftell(fp);
+	if (fseek(fp, 0, SEEK_SET) < 0) {
+		perror("drain:SEEK_SET");
+		return NULL;
+	}
+	char *const s = malloc(*size + 1);
+	if (s == NULL) {
+		perror("drain:malloc");
+		return NULL;
+	}
+	if ((long)fread(s, 1, *size, fp) != *size) {
+		perror("drain:fread");
+		free(s);
+		return NULL;
+	}
+	s[*size] = '\0';
+	return s;
+}