1 files changed, 77 insertions, 0 deletions
diff --git a/rdline.c b/rdline.c
new file mode 100644
index 0000000..99b4f4e
--- /dev/null
+++ b/rdline.c
@@ -0,0 +1,77 @@
+/* SPDX-License-Identifier: ISC */
+#include "gcrond.h"
+
+int rdline(rdline_t *t)
+{
+	size_t i, len;
+
+	do {
+		free(t->line);
+		t->line = NULL;
+		errno = 0;
+		len = 0;
+
+		if (getline(&t->line, &len, t->fp) < 0) {
+			if (errno) {
+				rdline_complain(t, strerror(errno));
+				return -1;
+			}
+			return 1;
+		}
+
+		t->lineno += 1;
+
+		for (i = 0; isspace(t->line[i]); ++i)
+			;
+
+		if (t->line[i] == '\0' || t->line[i] == '#') {
+			t->line[0] = '\0';
+		} else if (i) {
+			memmove(t->line, t->line + i, len - i + 1);
+		}
+	} while (t->line[0] == '\0');
+
+	return 0;
+}
+
+void rdline_complain(rdline_t *t, const char *msg, ...)
+{
+	va_list ap;
+
+	fprintf(stderr, "%s: %zu: ", t->filename, t->lineno);
+
+	va_start(ap, msg);
+	vfprintf(stderr, msg, ap);
+	va_end(ap);
+
+	fputc('\n', stderr);
+}
+
+int rdline_init(rdline_t *t, int dirfd, const char *filename)
+{
+	int fd;
+
+	memset(t, 0, sizeof(*t));
+
+	fd = openat(dirfd, filename, O_RDONLY);
+	if (fd == -1) {
+		perror(filename);
+		return -1;
+	}
+
+	t->fp = fdopen(fd, "r");
+	if (t->fp == NULL) {
+		perror("fdopen");
+		close(fd);
+		return -1;
+	}
+
+	t->filename = filename;
+	return 0;
+}
+
+void rdline_cleanup(rdline_t *t)
+{
+	free(t->line);
+	fclose(t->fp);
+}