git_buf_text_lf_to_crlf: allow mixed line endings

Allow files to have mixed line endings instead of skipping processing
on them.

src/buf_text.c

@@ -131,17 +131,15 @@ int git_buf_text_lf_to_crlf(git_buf *tgt, const git_buf *src)
 	for (; next; scan = next + 1, next = memchr(scan, '\n', end - scan)) {
 		size_t copylen = next - scan;
 
-		/* if we find mixed line endings, bail */
-		if (next > start && next[-1] == '\r') {
-			git_buf_free(tgt);
-			return GIT_PASSTHROUGH;
-		}
+		/* if we find mixed line endings, carry on */
+		if (copylen && next[-1] == '\r')
+			copylen--;
 
 		GITERR_CHECK_ALLOC_ADD(&alloclen, copylen, 3);
 		if (git_buf_grow_by(tgt, alloclen) < 0)
 			return -1;
 
-		if (next > scan) {
+		if (copylen) {
 			memcpy(tgt->ptr + tgt->size, scan, copylen);
 			tgt->size += copylen;
 		}

src/buf_text.h

@@ -58,8 +58,7 @@ extern void git_buf_text_unescape(git_buf *buf);
 /**
  * Replace all \r\n with \n.
  *
- * @return 0 on success, -1 on memory error, GIT_PASSTHROUGH if the
- * source buffer has mixed line endings.
+ * @return 0 on success, -1 on memory error
  */
 extern int git_buf_text_crlf_to_lf(git_buf *tgt, const git_buf *src);
 

tests/core/buffer.c

@@ -1054,14 +1054,20 @@ void test_core_buffer__lf_and_crlf_conversions(void)
 
 	git_buf_sets(&src, "crlf\r\ncrlf\r\ncrlf\r\ncrlf\r\n");
 
-	cl_git_fail_with(GIT_PASSTHROUGH, git_buf_text_lf_to_crlf(&tgt, &src));
+	cl_git_pass(git_buf_text_lf_to_crlf(&tgt, &src));
+	check_buf("crlf\r\ncrlf\r\ncrlf\r\ncrlf\r\n", tgt);
+
+	git_buf_sets(&src, "crlf\r\ncrlf\r\ncrlf\r\ncrlf\r\n");
 
 	cl_git_pass(git_buf_text_crlf_to_lf(&tgt, &src));
 	check_buf("crlf\ncrlf\ncrlf\ncrlf\n", tgt);
 
 	git_buf_sets(&src, "\r\ncrlf\r\ncrlf\r\ncrlf\r\ncrlf\r\ncrlf");
 
-	cl_git_fail_with(GIT_PASSTHROUGH, git_buf_text_lf_to_crlf(&tgt, &src));
+	cl_git_pass(git_buf_text_lf_to_crlf(&tgt, &src));
+	check_buf("\r\ncrlf\r\ncrlf\r\ncrlf\r\ncrlf\r\ncrlf", tgt);
+
+	git_buf_sets(&src, "\r\ncrlf\r\ncrlf\r\ncrlf\r\ncrlf\r\ncrlf");
 
 	cl_git_pass(git_buf_text_crlf_to_lf(&tgt, &src));
 	check_buf("\ncrlf\ncrlf\ncrlf\ncrlf\ncrlf", tgt);
@@ -1070,7 +1076,11 @@ void test_core_buffer__lf_and_crlf_conversions(void)
 
 	git_buf_sets(&src, "\nlf\nlf\ncrlf\r\nlf\nlf\ncrlf\r\n");
 
-	cl_git_fail_with(GIT_PASSTHROUGH, git_buf_text_lf_to_crlf(&tgt, &src));
+	cl_git_pass(git_buf_text_lf_to_crlf(&tgt, &src));
+	check_buf("\r\nlf\r\nlf\r\ncrlf\r\nlf\r\nlf\r\ncrlf\r\n", tgt);
+
+	git_buf_sets(&src, "\nlf\nlf\ncrlf\r\nlf\nlf\ncrlf\r\n");
+
 	cl_git_pass(git_buf_text_crlf_to_lf(&tgt, &src));
 	check_buf("\nlf\nlf\ncrlf\nlf\nlf\ncrlf\n", tgt);
 
@@ -1078,7 +1088,9 @@ void test_core_buffer__lf_and_crlf_conversions(void)
 
 	git_buf_sets(&src, "\ncrlf\r\ncrlf\r\nlf\ncrlf\r\ncrlf");
 
-	cl_git_fail_with(GIT_PASSTHROUGH, git_buf_text_lf_to_crlf(&tgt, &src));
+	cl_git_pass(git_buf_text_lf_to_crlf(&tgt, &src));
+	check_buf("\r\ncrlf\r\ncrlf\r\nlf\r\ncrlf\r\ncrlf", tgt);
+
 	cl_git_pass(git_buf_text_crlf_to_lf(&tgt, &src));
 	check_buf("\ncrlf\ncrlf\nlf\ncrlf\ncrlf", tgt);
 
@@ -1086,7 +1098,11 @@ void test_core_buffer__lf_and_crlf_conversions(void)
 
 	git_buf_sets(&src, "\rcrlf\r\nlf\nlf\ncr\rcrlf\r\nlf\ncr\r");
 
-	cl_git_fail_with(GIT_PASSTHROUGH, git_buf_text_lf_to_crlf(&tgt, &src));
+	cl_git_pass(git_buf_text_lf_to_crlf(&tgt, &src));
+	check_buf("\rcrlf\r\nlf\r\nlf\r\ncr\rcrlf\r\nlf\r\ncr\r", tgt);
+
+	git_buf_sets(&src, "\rcrlf\r\nlf\nlf\ncr\rcrlf\r\nlf\ncr\r");
+
 	cl_git_pass(git_buf_text_crlf_to_lf(&tgt, &src));
 	check_buf("\rcrlf\nlf\nlf\ncr\rcrlf\nlf\ncr\r", tgt);
 
@@ -1102,7 +1118,9 @@ void test_core_buffer__lf_and_crlf_conversions(void)
 	/* blob correspondence tests */
 
 	git_buf_sets(&src, ALL_CRLF_TEXT_RAW);
-	cl_git_fail_with(GIT_PASSTHROUGH, git_buf_text_lf_to_crlf(&tgt, &src));
+	cl_git_pass(git_buf_text_lf_to_crlf(&tgt, &src));
+	check_buf(ALL_CRLF_TEXT_AS_CRLF, tgt);
+	git_buf_sets(&src, ALL_CRLF_TEXT_RAW);
 	cl_git_pass(git_buf_text_crlf_to_lf(&tgt, &src));
 	check_buf(ALL_CRLF_TEXT_AS_LF, tgt);
 	git_buf_free(&src);
@@ -1111,20 +1129,25 @@ void test_core_buffer__lf_and_crlf_conversions(void)
 	git_buf_sets(&src, ALL_LF_TEXT_RAW);
 	cl_git_pass(git_buf_text_lf_to_crlf(&tgt, &src));
 	check_buf(ALL_LF_TEXT_AS_CRLF, tgt);
+	git_buf_sets(&src, ALL_LF_TEXT_RAW);
 	cl_git_pass(git_buf_text_crlf_to_lf(&tgt, &src));
 	check_buf(ALL_LF_TEXT_AS_LF, tgt);
 	git_buf_free(&src);
 	git_buf_free(&tgt);
 
 	git_buf_sets(&src, MORE_CRLF_TEXT_RAW);
-	cl_git_fail_with(GIT_PASSTHROUGH, git_buf_text_lf_to_crlf(&tgt, &src));
+	cl_git_pass(git_buf_text_lf_to_crlf(&tgt, &src));
+	check_buf(MORE_CRLF_TEXT_AS_CRLF, tgt);
+	git_buf_sets(&src, MORE_CRLF_TEXT_RAW);
 	cl_git_pass(git_buf_text_crlf_to_lf(&tgt, &src));
 	check_buf(MORE_CRLF_TEXT_AS_LF, tgt);
 	git_buf_free(&src);
 	git_buf_free(&tgt);
 
 	git_buf_sets(&src, MORE_LF_TEXT_RAW);
-	cl_git_fail_with(GIT_PASSTHROUGH, git_buf_text_lf_to_crlf(&tgt, &src));
+	cl_git_pass(git_buf_text_lf_to_crlf(&tgt, &src));
+	check_buf(MORE_LF_TEXT_AS_CRLF, tgt);
+	git_buf_sets(&src, MORE_LF_TEXT_RAW);
 	cl_git_pass(git_buf_text_crlf_to_lf(&tgt, &src));
 	check_buf(MORE_LF_TEXT_AS_LF, tgt);
 	git_buf_free(&src);