Function read_old_data

apply.c:2401–2427

}

static int read_old_data(struct stat *st, struct patch *patch,
			 const char *path, struct strbuf *buf)
{
	int conv_flags = patch->crlf_in_old ?
		CONV_EOL_KEEP_CRLF : CONV_EOL_RENORMALIZE;
	switch (st->st_mode & S_IFMT) {
	case S_IFLNK:
		if (strbuf_readlink(buf, path, st->st_size) < 0)
			return error(_("unable to read symlink %s"), path);
		return 0;
	case S_IFREG:
		if (strbuf_read_file(buf, path, st->st_size) != st->st_size)
			return error(_("unable to open or read %s"), path);
		/*
		 * "git apply" without "--index/--cached" should never look
		 * at the index; the target file may not have been added to
		 * the index yet, and we may not even be in any Git repository.
		 * Pass NULL to convert_to_git() to stress this; the function
		 * should never look at the index when explicit crlf option
		 * is given.
		 */
		convert_to_git(NULL, path, buf->buf, buf->len, buf, conv_flags);
		return 0;
	default:
		return -1;
	}
}

/*
 * Update the preimage, and the common lines in postimage,