diff -r 000000000000 -r 66998d6a1765 util.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/util.c	Mon Feb 11 11:21:54 2008 -0500
@@ -0,0 +1,68 @@
+#include <limits.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+
+int
+razor_create_dir(const char *root, const char *path)
+{
+	char buffer[PATH_MAX], *p;
+	const char *slash, *next;
+	struct stat buf;
+
+	/* Create all sub-directories in dir and then create name. We
+	 * know root exists and is a dir, root does not end in a '/',
+	 * and path has a leading '/'. */
+
+	strcpy(buffer, root);
+	p = buffer + strlen(buffer);
+	slash = path;
+	for (slash = path; slash[1] != '\0'; slash = next) {
+		next = strchr(slash + 1, '/');
+		memcpy(p, slash, next - slash);
+		p += next - slash;
+		*p = '\0';
+
+		if (stat(buffer, &buf) == 0) {
+			if (!S_ISDIR(buf.st_mode)) {
+				fprintf(stderr,
+					"%s exists but is not a directory\n",
+					buffer);
+				return -1;
+			}
+		} else if (mkdir(buffer, 0777) < 0) {
+			fprintf(stderr, "failed to make directory %s: %m\n",
+				buffer);
+			return -1;
+		}
+
+		/* FIXME: What to do about permissions for dirs we
+		 * have to create but are not in the cpio archive? */
+	}
+
+	return 0;
+}
+
+int
+razor_write(int fd, const void *data, size_t size)
+{
+	size_t rest;
+	ssize_t written;
+	const unsigned char *p;
+
+	rest = size;
+	p = data;
+	while (rest > 0) {
+		written = write(fd, p, rest);
+		if (written < 0) {
+			fprintf(stderr, "write error: %m\n");
+			return -1;
+		}
+		rest -= written;
+		p += written;
+	}
+
+	return 0;
+}