Allow creating zet in editor

zet.dpi.c

@@ -94,7 +94,7 @@ static int count_lines_in(const char *str) {
 
 static int count_lines(int fd) {
 	int count = 1;
-	do {
+	if (fd >= 0) do {
 		unsigned char buf[4096];
 		size_t len = sizeof(buf)-1;
 		int rc = read_some(fd, buf, &len);
@@ -189,7 +189,7 @@ static int write_topbar(int fd, enum page page, const char *id, const char *titl
 
 static int passthrough_note_html(int fd, int note_fd) {
 	int rc;
-	do {
+	if (note_fd >= 0) do {
 		unsigned char buf[4096];
 		size_t len = sizeof(buf)-1;
 		rc = read_some(note_fd, buf, &len);
@@ -219,6 +219,7 @@ static int dpi_respond_err(int fd, const char *fmt, ...) {
 }
 
 static char *zet_get_title_fd(int fd, char *buf, size_t len) {
+	if (fd < 0) return NULL;
 	int rc = read_some(fd, (unsigned char *)buf, &len);
 	if (rc < 0) return NULL;
 	buf[len] = '\0';
@@ -745,7 +746,7 @@ md_rndr_autolink(struct buf *ob, const struct buf *link, enum mkd_autolink type,
 }
 
 static int dpi_serve_zet(int fd, char *path) {
-	int rc;
+	int rc = 0;
 	char *hash, *query;
 	parse_req_uri(path, &hash, &query);
 
@@ -761,21 +762,20 @@ static int dpi_serve_zet(int fd, char *path) {
 	if (sz < 0 || (size_t)sz >= sizeof(path_buf)) return dpi_respond_err(fd, "read_file");
 
 	int note_fd = open(path_buf, O_RDONLY);
-	if (note_fd < 0 && errno == ENOENT) return dpi_serve_not_found(fd);
+	if (note_fd < 0 && errno != ENOENT) return dpi_respond_err(fd, "open");
-	if (note_fd < 0) return dpi_respond_err(fd, "open");
 
 	int rows = count_lines(note_fd);
 	if (rows < 0) return dpi_respond_err(fd, "count_lines"); 
 	static const int max_rows = 57, min_rows = 8;
 	if (rows > max_rows) rows = max_rows;
 	else if (rows < min_rows) rows = min_rows;
-	rc = lseek(note_fd, 0, SEEK_SET);
+	if (note_fd >= 0) rc = lseek(note_fd, 0, SEEK_SET);
 	if (rc < 0) return dpi_respond_err(fd, "lseek");
 
 	char buf[128];
 	char *title = zet_get_title_fd(note_fd, buf, sizeof(buf));
 	if (title == NULL) title = id;
-	rc = lseek(note_fd, 0, SEEK_SET);
+	if (note_fd >= 0) rc = lseek(note_fd, 0, SEEK_SET);
 	if (rc < 0) return dpi_respond_err(fd, "lseek");
 
 	rc = dpi_send_header(fd, "text/html");
@@ -803,13 +803,13 @@ static int dpi_serve_zet(int fd, char *path) {
 		"<td>"
 		);
 	if (rc < 0) { warn("dpi_send_header"); close(fd); return 0; }
-	rc = lseek(note_fd, 0, SEEK_SET);
+	if (note_fd >= 0) rc = lseek(note_fd, 0, SEEK_SET);
 	if (rc < 0) {
 		rc = dprintf(fd, "\n<strong>Error</strong>: %s", strerror(errno));
 		if (rc < 0) warnx("dprintf");
 		close(fd);
 	}
-	char *text = read_full(note_fd);
+	char *text = note_fd >= 0 ? read_full(note_fd) : NULL;
 	if (text == NULL) {
 		rc = dprintf(fd, "\n<strong>Error</strong>: %s", strerror(errno));
 		if (rc < 0) warnx("dprintf");