1 files changed, 87 insertions, 0 deletions
diff --git a/lib/dpkg/deb-version.c b/lib/dpkg/deb-version.c
new file mode 100644
index 0000000..cee5ddd
--- /dev/null
+++ b/lib/dpkg/deb-version.c
@@ -0,0 +1,87 @@
+/*
+ * libdpkg - Debian packaging suite library routines
+ * deb-version.c - deb format version handling routines
+ *
+ * Copyright © 2012-2013 Guillem Jover <guillem@debian.org>
+ *
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+#include <compat.h>
+
+#include <limits.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include <dpkg/i18n.h>
+#include <dpkg/c-ctype.h>
+#include <dpkg/dpkg.h>
+#include <dpkg/deb-version.h>
+
+/**
+ * Parse a .deb format version.
+ *
+ * It takes a string and parses a .deb archive format version in the form
+ * of "X.Y", without any leading whitespace, and ending in either a newline
+ * or a NUL. If there is any syntax error a descriptive error string is
+ * returned.
+ *
+ * @param version The version to return.
+ * @param str     The string to parse.
+ *
+ * @return        An error string, or NULL if there was no error.
+ */
+const char *
+deb_version_parse(struct deb_version *version, const char *str)
+{
+	const char *str_minor, *end;
+	unsigned int major = 0;
+	unsigned int minor = 0;
+	unsigned int divlimit = INT_MAX / 10;
+	int modlimit = INT_MAX % 10;
+
+	for (end = str; *end && c_isdigit(*end); end++) {
+		int ord = *end - '0';
+
+		if (major > divlimit || (major == divlimit && ord > modlimit))
+			return _("format version with too big major component");
+
+		major = major * 10  + ord;
+	}
+
+	if (end == str)
+		return _("format version with empty major component");
+	if (*end != '.')
+		return _("format version has no dot");
+
+	for (end = str_minor = end + 1; *end && c_isdigit(*end); end++) {
+		int ord = *end - '0';
+
+		if (minor > divlimit || (minor == divlimit && ord > modlimit))
+			return _("format version with too big minor component");
+
+		minor = minor * 10 + ord;
+	}
+
+	if (end == str_minor)
+		return _("format version with empty minor component");
+	if (*end != '\n' && *end != '\0')
+		return _("format version followed by junk");
+
+	version->major = major;
+	version->minor = minor;
+
+	return NULL;
+}