lib: Wrapper for retrieving info from a database directory

Currently provides list of segbits files saved in the database.

Signed-off-by: Rick Altherr <kc8apf@kc8apf.net>
Signed-off-by: Tim 'mithro' Ansell <mithro@mithis.com>

lib/CMakeLists.txt

@@ -1,4 +1,5 @@
 add_library(libprjxray
+	database.cc
 	memory_mapped_file.cc
 	segbits_file_reader.cc)
 target_include_directories(libprjxray PUBLIC "include")

lib/database.cc

@@ -0,0 +1,37 @@
+#include <prjxray/database.h>
+
+#include <glob.h>
+
+#include <memory>
+
+#include <absl/strings/str_cat.h>
+
+namespace prjxray {
+
+static constexpr const char kSegbitsGlobPattern[] = "segbits_*.db";
+
+std::vector<std::unique_ptr<prjxray::SegbitsFileReader>> Database::segbits() const {
+	std::vector<std::unique_ptr<prjxray::SegbitsFileReader>> segbits;
+
+	glob_t segbits_glob_results;
+	int ret = glob(absl::StrCat(db_path_, "/", kSegbitsGlobPattern).c_str(),
+		       GLOB_NOSORT | GLOB_TILDE,
+		       NULL, &segbits_glob_results);
+	if (ret < 0) {
+		return {};
+	}
+
+	for(size_t idx = 0; idx < segbits_glob_results.gl_pathc; idx++) {
+		auto this_segbit = SegbitsFileReader::InitWithFile(
+			segbits_glob_results.gl_pathv[idx]);
+		if (this_segbit) {
+			segbits.emplace_back(std::move(this_segbit));
+		}
+	}
+
+	globfree(&segbits_glob_results);
+
+	return segbits;
+}
+
+}  // namespace prjxray

lib/include/prjxray/database.h

@@ -0,0 +1,25 @@
+#ifndef PRJXRAY_LIB_DATABASE_H
+#define PRJXRAY_LIB_DATABASE_H
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include <prjxray/segbits_file_reader.h>
+
+namespace prjxray {
+
+class Database {
+ public:
+	Database(const std::string &path)
+		: db_path_(path) {}
+
+	std::vector<std::unique_ptr<SegbitsFileReader>> segbits() const;
+
+ private:
+	std::string db_path_;
+};
+
+}  // namespace prjxray
+
+#endif // PRJXRAY_LIB_DATABASE_H