From c098eb31d870aafd96ef055d725f2e127043f6ab Mon Sep 17 00:00:00 2001
From: "C. McEnroe" <june@causal.agency>
Date: Sun, 1 Dec 2019 19:22:38 -0500
Subject: Implement database file search

---
 .gitignore  |  3 +++
 Makefile    | 22 ++++++++++++++++++++
 litterbox.c | 28 +++++++++++++++++++++++++
 litterbox.h | 68 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 121 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100644 litterbox.c
 create mode 100644 litterbox.h

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..bea9ab7
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+*.o
+litterbox
+tags
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..573290a
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,22 @@
+LIBS_PREFIX = /usr/local
+
+CFLAGS += -std=c11 -Wall -Wextra -Wpedantic
+CFLAGS += ${LIBS_PREFIX:%=-I%/include}
+LDFLAGS += ${LIBS_PREFIX:%=-L%/lib}
+LDLIBS = -lsqlite3
+
+BINS = litterbox
+
+-include config.mk
+
+dev: tags all
+
+all: ${BINS}
+
+${BINS:=.o}: litterbox.h
+
+tags: *.c *.h
+	ctags -w *.c *.h
+
+clean:
+	rm -f tags ${BINS} ${BINS:=.o}
diff --git a/litterbox.c b/litterbox.c
new file mode 100644
index 0000000..bcfdd8f
--- /dev/null
+++ b/litterbox.c
@@ -0,0 +1,28 @@
+/* Copyright (C) 2019  C. McEnroe <june@causal.agency>
+ *
+ * This program 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 <err.h>
+#include <sqlite3.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sysexits.h>
+
+#include "litterbox.h"
+
+int main(void) {
+	sqlite3 *db = dbOpen(SQLITE_OPEN_READWRITE);
+	printf("%p\n", (void *)db);
+}
diff --git a/litterbox.h b/litterbox.h
new file mode 100644
index 0000000..48d707c
--- /dev/null
+++ b/litterbox.h
@@ -0,0 +1,68 @@
+/* Copyright (C) 2019  C. McEnroe <june@causal.agency>
+ *
+ * This program 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 <err.h>
+#include <errno.h>
+#include <limits.h>
+#include <sqlite3.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sysexits.h>
+
+#define DATABASE_PATH "litterbox/database.sqlite"
+
+static inline sqlite3 *dbOpenPath(char *path, int flags) {
+	char *base = strrchr(path, '/');
+	if (flags & SQLITE_OPEN_CREATE && base) {
+		*base = '\0';
+		int error = mkdir(path, 0700);
+		if (error && errno != EEXIST) err(EX_CANTCREAT, "%s", path);
+		*base = '/';
+	}
+	sqlite3 *db;
+	int error = sqlite3_open_v2(path, &db, flags, NULL);
+	if (!error) return db;
+	if (error == SQLITE_CANTOPEN) {
+		sqlite3_close(db);
+		return NULL;
+	}
+	errx(EX_NOINPUT, "%s: %s", path, sqlite3_errmsg(db));
+}
+
+static inline sqlite3 *dbOpen(int flags) {
+	const char *home = getenv("HOME");
+	const char *dataHome = getenv("XDG_DATA_HOME");
+	const char *dataDirs = getenv("XDG_DATA_DIRS");
+	char path[PATH_MAX];
+	if (dataHome) {
+		snprintf(path, sizeof(path), "%s/" DATABASE_PATH, dataHome);
+	} else {
+		snprintf(path, sizeof(path), "%s/.local/share/" DATABASE_PATH, home);
+	}
+	sqlite3 *db = dbOpenPath(path, flags);
+	if (db) return db;
+	while (dataDirs && *dataDirs) {
+		size_t len = strcspn(dataDirs, ":");
+		snprintf(path, sizeof(path), "%.*s/" DATABASE_PATH, (int)len, dataDirs);
+		db = dbOpenPath(path, flags);
+		if (db) return db;
+		dataDirs += len;
+		if (*dataDirs) dataDirs++;
+	}
+	return NULL;
+}
-- 
cgit 1.4.1