static int parse_hunk_body()

in src/patch_parse.c [565:709]

• 105 lines of code
• 22 McCabe index (conditional complexity)

static int parse_hunk_body(
	git_patch_parsed *patch,
	git_patch_hunk *hunk,
	git_patch_parse_ctx *ctx)
{
	git_diff_line *line;
	int error = 0;

	int oldlines = hunk->hunk.old_lines;
	int newlines = hunk->hunk.new_lines;
	int last_origin = 0;

	for (;
		ctx->parse_ctx.remain_len > 1 &&
		(oldlines || newlines) &&
		!git_parse_ctx_contains_s(&ctx->parse_ctx, "@@ -");
		git_parse_advance_line(&ctx->parse_ctx)) {

		int old_lineno, new_lineno, origin, prefix = 1;
		char c;

		if (git__add_int_overflow(&old_lineno, hunk->hunk.old_start, hunk->hunk.old_lines) ||
		    git__sub_int_overflow(&old_lineno, old_lineno, oldlines) ||
		    git__add_int_overflow(&new_lineno, hunk->hunk.new_start, hunk->hunk.new_lines) ||
		    git__sub_int_overflow(&new_lineno, new_lineno, newlines)) {
			error = git_parse_err("unrepresentable line count at line %"PRIuZ,
					      ctx->parse_ctx.line_num);
			goto done;
		}

		if (ctx->parse_ctx.line_len == 0 || ctx->parse_ctx.line[ctx->parse_ctx.line_len - 1] != '\n') {
			error = git_parse_err("invalid patch instruction at line %"PRIuZ,
				ctx->parse_ctx.line_num);
			goto done;
		}

		git_parse_peek(&c, &ctx->parse_ctx, 0);

		switch (c) {
		case '\n':
			prefix = 0;
			/* fall through */

		case ' ':
			origin = GIT_DIFF_LINE_CONTEXT;
			oldlines--;
			newlines--;
			break;

		case '-':
			origin = GIT_DIFF_LINE_DELETION;
			oldlines--;
			new_lineno = -1;
			break;

		case '+':
			origin = GIT_DIFF_LINE_ADDITION;
			newlines--;
			old_lineno = -1;
			break;

		case '\\':
			/*
			 * If there are no oldlines left, then this is probably
			 * the "\ No newline at end of file" marker. Do not
			 * verify its format, as it may be localized.
			 */
			if (!oldlines) {
				prefix = 0;
				origin = eof_for_origin(last_origin);
				old_lineno = -1;
				new_lineno = -1;
				break;
			}
			/* fall through */

		default:
			error = git_parse_err("invalid patch hunk at line %"PRIuZ, ctx->parse_ctx.line_num);
			goto done;
		}

		line = git_array_alloc(patch->base.lines);
		GIT_ERROR_CHECK_ALLOC(line);

		memset(line, 0x0, sizeof(git_diff_line));

		line->content_len = ctx->parse_ctx.line_len - prefix;
		line->content = git__strndup(ctx->parse_ctx.line + prefix, line->content_len);
		GIT_ERROR_CHECK_ALLOC(line->content);
		line->content_offset = ctx->parse_ctx.content_len - ctx->parse_ctx.remain_len;
		line->origin = origin;
		line->num_lines = 1;
		line->old_lineno = old_lineno;
		line->new_lineno = new_lineno;

		hunk->line_count++;

		last_origin = origin;
	}

	if (oldlines || newlines) {
		error = git_parse_err(
			"invalid patch hunk, expected %d old lines and %d new lines",
			hunk->hunk.old_lines, hunk->hunk.new_lines);
		goto done;
	}

	/*
	 * Handle "\ No newline at end of file". Only expect the leading
	 * backslash, though, because the rest of the string could be
	 * localized.  Because `diff` optimizes for the case where you
	 * want to apply the patch by hand.
	 */
	if (git_parse_ctx_contains_s(&ctx->parse_ctx, "\\ ") &&
		git_array_size(patch->base.lines) > 0) {

		line = git_array_get(patch->base.lines, git_array_size(patch->base.lines) - 1);

		if (line->content_len < 1) {
			error = git_parse_err("last line has no trailing newline");
			goto done;
		}

		line = git_array_alloc(patch->base.lines);
		GIT_ERROR_CHECK_ALLOC(line);

		memset(line, 0x0, sizeof(git_diff_line));

		line->content_len = ctx->parse_ctx.line_len;
		line->content = git__strndup(ctx->parse_ctx.line, line->content_len);
		GIT_ERROR_CHECK_ALLOC(line->content);
		line->content_offset = ctx->parse_ctx.content_len - ctx->parse_ctx.remain_len;
		line->origin = eof_for_origin(last_origin);
		line->num_lines = 1;
		line->old_lineno = -1;
		line->new_lineno = -1;

		hunk->line_count++;

		git_parse_advance_line(&ctx->parse_ctx);
	}

done:
	return error;
}