test helpers: move test-* to t/helper/ subdirectory

This keeps top dir a bit less crowded. And because these programs are
for testing purposes, it makes sense that they stay somewhere in t/

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/helper/test-line-buffer.c

@@ -0,0 +1,91 @@
+/*
+ * test-line-buffer.c: code to exercise the svn importer's input helper
+ */
+
+#include "git-compat-util.h"
+#include "strbuf.h"
+#include "vcs-svn/line_buffer.h"
+
+static uint32_t strtouint32(const char *s)
+{
+	char *end;
+	uintmax_t n = strtoumax(s, &end, 10);
+	if (*s == '\0' || *end != '\0')
+		die("invalid count: %s", s);
+	return (uint32_t) n;
+}
+
+static void handle_command(const char *command, const char *arg, struct line_buffer *buf)
+{
+	switch (*command) {
+	case 'b':
+		if (starts_with(command, "binary ")) {
+			struct strbuf sb = STRBUF_INIT;
+			strbuf_addch(&sb, '>');
+			buffer_read_binary(buf, &sb, strtouint32(arg));
+			fwrite(sb.buf, 1, sb.len, stdout);
+			strbuf_release(&sb);
+			return;
+		}
+	case 'c':
+		if (starts_with(command, "copy ")) {
+			buffer_copy_bytes(buf, strtouint32(arg));
+			return;
+		}
+	case 's':
+		if (starts_with(command, "skip ")) {
+			buffer_skip_bytes(buf, strtouint32(arg));
+			return;
+		}
+	default:
+		die("unrecognized command: %s", command);
+	}
+}
+
+static void handle_line(const char *line, struct line_buffer *stdin_buf)
+{
+	const char *arg = strchr(line, ' ');
+	if (!arg)
+		die("no argument in line: %s", line);
+	handle_command(line, arg + 1, stdin_buf);
+}
+
+int main(int argc, char *argv[])
+{
+	struct line_buffer stdin_buf = LINE_BUFFER_INIT;
+	struct line_buffer file_buf = LINE_BUFFER_INIT;
+	struct line_buffer *input = &stdin_buf;
+	const char *filename;
+	char *s;
+
+	if (argc == 1)
+		filename = NULL;
+	else if (argc == 2)
+		filename = argv[1];
+	else
+		usage("test-line-buffer [file | &fd] < script");
+
+	if (buffer_init(&stdin_buf, NULL))
+		die_errno("open error");
+	if (filename) {
+		if (*filename == '&') {
+			if (buffer_fdinit(&file_buf, strtouint32(filename + 1)))
+				die_errno("error opening fd %s", filename + 1);
+		} else {
+			if (buffer_init(&file_buf, filename))
+				die_errno("error opening %s", filename);
+		}
+		input = &file_buf;
+	}
+
+	while ((s = buffer_read_line(&stdin_buf)))
+		handle_line(s, input);
+
+	if (filename && buffer_deinit(&file_buf))
+		die("error reading from %s", filename);
+	if (buffer_deinit(&stdin_buf))
+		die("input error");
+	if (ferror(stdout))
+		die("output error");
+	return 0;
+}