From 2a26a37a475ef789e84d9b7c3cf2eb4461bad24a Mon Sep 17 00:00:00 2001
From: "K. Lange" <klange@toaruos.org>
Date: Sun, 14 Nov 2021 11:09:45 +0900
Subject: [PATCH] gunzip: Hidden option to print progress reports, for
 debugging

---
 apps/gunzip.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/apps/gunzip.c b/apps/gunzip.c
index 529f1ea9..db17f940 100644
--- a/apps/gunzip.c
+++ b/apps/gunzip.c
@@ -15,11 +15,23 @@
 
 static int to_stdout = 0;
 static int keep = 0;
+static int progress = 0;
+static off_t total_length = 0;
+static size_t count = 0;
 
 static uint8_t _get(struct inflate_context * ctx) {
 	return fgetc(ctx->input_priv);
 }
 
+static uint8_t _get_progress(struct inflate_context * ctx) {
+	count++;
+	if (!(count & 0x3FF)) {
+		fprintf(stderr, "\r%zu KiB / %zu KiB (%zu%%)", count / 1024, total_length / 1024, 100 * count / total_length);
+		fflush(stderr);
+	}
+	return fgetc(ctx->input_priv);
+}
+
 static void _write(struct inflate_context * ctx, unsigned int sym) {
 	fputc(sym, ctx->output_priv);
 }
@@ -73,6 +85,15 @@ int main(int argc, char * argv[]) {
 		return 1;
 	}
 
+	char * maybeProgress = getenv("GUNZIP_PROGRESS");
+
+	if (maybeProgress && !strcmp(maybeProgress, "1")) {
+		progress = 1;
+		fseek(f, 0, SEEK_END);
+		total_length = ftell(f);
+		fseek(f, 0, SEEK_SET);
+	}
+
 	struct inflate_context ctx;
 	ctx.input_priv = f;
 	if (to_stdout) {
@@ -83,7 +104,7 @@ int main(int argc, char * argv[]) {
 		ctx.output_priv = fopen(tmp,"w");
 		free(tmp);
 	}
-	ctx.get_input = _get;
+	ctx.get_input = progress ? _get_progress : _get;
 	ctx.write_output = _write;
 	ctx.ring = NULL; /* Use the global one */