Read files in edi

1 files changed, 85 insertions, 0 deletions

diff --git a/bin/edi/file.c b/bin/edi/file.c
new file mode 100644
index 00000000..9f85d1da
--- /dev/null
+++ b/bin/edi/file.c
@@ -0,0 +1,85 @@
+/* Copyright (C) 2018  June McEnroe <june@causal.agency>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <assert.h>
+#include <err.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sysexits.h>
+#include <wchar.h>
+
+#include "edi.h"
+
+enum {
+	BufCap = 8192,
+	LogCap = 8,
+};
+
+struct File fileAlloc(char *path) {
+	struct File file = {
+		.path = path,
+		.buf = bufferAlloc(BufCap),
+		.log = logAlloc(LogCap),
+		.clean = 0,
+	};
+	if (!path) logPush(&file.log, TableEmpty);
+	return file;
+}
+
+void fileFree(struct File *file) {
+	logFree(&file->log);
+	bufferFree(&file->buf);
+	free(file->path);
+}
+
+static const mbstate_t MBStateInit;
+
+// TODO: Error handling.
+void fileRead(struct File *file) {
+	if (!file->path) return;
+
+	FILE *stream = fopen(file->path, "r");
+	if (!stream) {
+		if (errno != ENOENT) err(EX_NOINPUT, "%s", file->path);
+		logPush(&file->log, TableEmpty);
+		file->clean = file->log.state;
+		return;
+	}
+
+	struct Table table = tableAlloc(1);
+
+	char buf[BufCap];
+	mbstate_t mbState = MBStateInit;
+	while (!feof(stream)) {
+		size_t mbsLen = fread(buf, 1, sizeof(buf), stream);
+		if (ferror(stream)) err(EX_IOERR, "%s", file->path);
+
+		const char *mbs = buf;
+		mbstate_t mbLenState = mbState;
+		size_t wcsLen = mbsnrtowcs(NULL, &mbs, mbsLen, 0, &mbLenState);
+		if (wcsLen == (size_t)-1) err(EX_DATAERR, "%s", file->path);
+
+		wchar_t *wcs = bufferDest(&file->buf, wcsLen);
+		assert(wcsLen == mbsnrtowcs(wcs, &mbs, mbsLen, wcsLen, &mbState));
+
+		tablePush(&table, file->buf.slice);
+	}
+	logPush(&file->log, table);
+	file->clean = file->log.state;
+
+	fclose(stream);
+}