io: prepartions for url handling

1 files changed, 75 insertions, 0 deletions

diff --git a/src/url.c b/src/url.c
new file mode 100644
index 0000000..0999399
--- /dev/null
+++ b/src/url.c
@@ -0,0 +1,75 @@
+/* url.c - Alpine Package Keeper (APK)
+ *
+ * Copyright (C) 2005-2008 Natanael Copa <n@tanael.org>
+ * Copyright (C) 2008 Timo Teräs <timo.teras@iki.fi>
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it 
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation. See http://www.gnu.org/ for details.
+ */
+
+#include <stdio.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "apk_io.h"
+
+static const char *url_is_file(const char *url)
+{
+	if (strncmp(url, "file:", 5) == 0)
+		return &url[5];
+
+	if (strncmp(url, "http:", 5) != 0 &&
+	    strncmp(url, "https:", 6) != 0 &&
+	    strncmp(url, "ftp:", 4) != 0)
+		return url;
+
+	return NULL;
+}
+
+static int fork_wget(const char *url)
+{
+	pid_t pid;
+	int fds[2];
+
+	if (pipe(fds) < 0)
+		return -1;
+
+	pid = fork();
+	if (pid == -1) {
+		close(fds[0]);
+		close(fds[1]);
+		return -1;
+	}
+
+	if (pid == 0) {
+		setsid();
+		close(fds[0]);
+		dup2(open("/dev/null", O_WRONLY), STDERR_FILENO);
+		dup2(open("/dev/null", O_RDONLY), STDIN_FILENO);
+		dup2(fds[1], STDOUT_FILENO);
+		execlp("wget", "wget", "-O", "-", url, NULL);
+		exit(0);
+	}
+
+	close(fds[1]);
+	return fds[0];
+}
+
+struct apk_istream *apk_istream_from_url(const char *url)
+{
+	if (url_is_file(url) != NULL)
+		return apk_istream_from_file(url_is_file(url));
+
+	return apk_istream_from_fd(fork_wget(url));
+}
+
+struct apk_bstream *apk_bstream_from_url(const char *url)
+{
+	if (url_is_file(url))
+		return apk_bstream_from_file(url);
+
+	return apk_bstream_from_fd(fork_wget(url));
+}