1 files changed, 84 insertions, 18 deletions

diff --git a/convert.c b/convert.c
index 3bb5a4dd5..12868ed7b 100644
--- a/convert.c
+++ b/convert.c
@@ -641,7 +641,7 @@ static int ident_to_worktree(const char *path, const char *src, size_t len,
 	return 1;
 }
 
-static int git_path_check_crlf(const char *path, struct git_attr_check *check)
+static enum crlf_action git_path_check_crlf(const char *path, struct git_attr_check *check)
 {
 	const char *value = check->value;
 
@@ -658,7 +658,7 @@ static int git_path_check_crlf(const char *path, struct git_attr_check *check)
 	return CRLF_GUESS;
 }
 
-static int git_path_check_eol(const char *path, struct git_attr_check *check)
+static enum eol git_path_check_eol(const char *path, struct git_attr_check *check)
 {
 	const char *value = check->value;
 
@@ -811,7 +811,7 @@ int renormalize_buffer(const char *path, const char *src, size_t len, struct str
 		src = dst->buf;
 		len = dst->len;
 	}
-	return ret | convert_to_git(path, src, len, dst, 0);
+	return ret | convert_to_git(path, src, len, dst, SAFE_CRLF_FALSE);
 }
 
 /*****************************************************************
@@ -876,43 +876,109 @@ int is_null_stream_filter(struct stream_filter *filter)
 /*
  * LF-to-CRLF filter
  */
+
+struct lf_to_crlf_filter {
+	struct stream_filter filter;
+	unsigned has_held:1;
+	char held;
+};
+
 static int lf_to_crlf_filter_fn(struct stream_filter *filter,
 				const char *input, size_t *isize_p,
 				char *output, size_t *osize_p)
 {
-	size_t count;
+	size_t count, o = 0;
+	struct lf_to_crlf_filter *lf_to_crlf = (struct lf_to_crlf_filter *)filter;
+
+	/*
+	 * We may be holding onto the CR to see if it is followed by a
+	 * LF, in which case we would need to go to the main loop.
+	 * Otherwise, just emit it to the output stream.
+	 */
+	if (lf_to_crlf->has_held && (lf_to_crlf->held != '\r' || !input)) {
+		output[o++] = lf_to_crlf->held;
+		lf_to_crlf->has_held = 0;
+	}
+
+	/* We are told to drain */
+	if (!input) {
+		*osize_p -= o;
+		return 0;
+	}
 
-	if (!input)
-		return 0; /* we do not keep any states */
 	count = *isize_p;
-	if (count) {
-		size_t i, o;
-		for (i = o = 0; o < *osize_p && i < count; i++) {
+	if (count || lf_to_crlf->has_held) {
+		size_t i;
+		int was_cr = 0;
+
+		if (lf_to_crlf->has_held) {
+			was_cr = 1;
+			lf_to_crlf->has_held = 0;
+		}
+
+		for (i = 0; o < *osize_p && i < count; i++) {
 			char ch = input[i];
+
 			if (ch == '\n') {
-				if (o + 1 < *osize_p)
-					output[o++] = '\r';
-				else
-					break;
+				output[o++] = '\r';
+			} else if (was_cr) {
+				/*
+				 * Previous round saw CR and it is not followed
+				 * by a LF; emit the CR before processing the
+				 * current character.
+				 */
+				output[o++] = '\r';
+			}
+
+			/*
+			 * We may have consumed the last output slot,
+			 * in which case we need to break out of this
+			 * loop; hold the current character before
+			 * returning.
+			 */
+			if (*osize_p <= o) {
+				lf_to_crlf->has_held = 1;
+				lf_to_crlf->held = ch;
+				continue; /* break but increment i */
 			}
+
+			if (ch == '\r') {
+				was_cr = 1;
+				continue;
+			}
+
+			was_cr = 0;
 			output[o++] = ch;
 		}
 
 		*osize_p -= o;
 		*isize_p -= i;
+
+		if (!lf_to_crlf->has_held && was_cr) {
+			lf_to_crlf->has_held = 1;
+			lf_to_crlf->held = '\r';
+		}
 	}
 	return 0;
 }
 
+static void lf_to_crlf_free_fn(struct stream_filter *filter)
+{
+	free(filter);
+}
+
 static struct stream_filter_vtbl lf_to_crlf_vtbl = {
 	lf_to_crlf_filter_fn,
-	null_free_fn,
+	lf_to_crlf_free_fn,
 };
 
-static struct stream_filter lf_to_crlf_filter_singleton = {
-	&lf_to_crlf_vtbl,
-};
+static struct stream_filter *lf_to_crlf_filter(void)
+{
+	struct lf_to_crlf_filter *lf_to_crlf = xcalloc(1, sizeof(*lf_to_crlf));
 
+	lf_to_crlf->filter.vtbl = &lf_to_crlf_vtbl;
+	return (struct stream_filter *)lf_to_crlf;
+}
 
 /*
  * Cascade filter
@@ -1194,7 +1260,7 @@ struct stream_filter *get_stream_filter(const char *path, const unsigned char *s
 
 	else if (output_eol(crlf_action) == EOL_CRLF &&
 		 !(crlf_action == CRLF_AUTO || crlf_action == CRLF_GUESS))
-		filter = cascade_filter(filter, &lf_to_crlf_filter_singleton);
+		filter = cascade_filter(filter, lf_to_crlf_filter());
 
 	return filter;
 }