66     while (line[i] != NUL)  in get_leader_len()
83 	    *string++ = NUL;	    // isolate flags from string  in get_leader_len()
112 	    for (j = 0; string[j] != NUL && string[j] == line[i + j]; ++j)  in get_leader_len()
114 	    if (string[j] != NUL)  in get_leader_len()
120 			   && !VIM_ISWHITE(line[i + j]) && line[i + j] != NUL)  in get_leader_len()
222 	    *string++ = NUL;	// Isolate flags from string.  in get_last_leader_offset()
238 	    for (j = 0; string[j] != NUL && string[j] == line[i + j]; ++j)  in get_last_leader_offset()
240 	    if (string[j] != NUL)  in get_last_leader_offset()
248 		    && !VIM_ISWHITE(line[i + j]) && line[i + j] != NUL)  in get_last_leader_offset()
398     if (*s == NUL)		// empty line  in plines_win_nofold()
406     if (wp->w_p_list && wp->w_lcs_chars.eol != NUL)  in plines_win_nofold()
450     while (*s != NUL && --column >= 0)  in plines_win_col()
520 	return NUL;  in gchar_pos()
730 	buf[1] = NUL;  in f_mode()
895 	    buf[len >= buflen ? buflen - 1 : len] = NUL;  in get_keystroke()
1181     if (var == NULL || *var == NUL)  in init_homedir()
1187 	if (homepath == NULL || *homepath == NUL)  in init_homedir()
1193 	    if (NameBuff[0] != NUL)  in init_homedir()
1216 	    if (exp != NULL && *exp != NUL  in init_homedir()
1225     if (var != NULL && *var == NUL)	// empty is same as not set  in init_homedir()
1405 		    while (c-- > 0 && *tail != NUL && ((vim_isIDc(*tail))  in expand_env_esc()
1429 		    *var = NUL;  in expand_env_esc()
1436 	    else if (  src[1] == NUL  in expand_env_esc()
1457 		*var = NUL;  in expand_env_esc()
1469 		    struct passwd *pw = (*dst == NUL)  in expand_env_esc()
1503 			    *next_path++ = NUL;  in expand_env_esc()
1557 	    if (var != NULL && *var != NUL  in expand_env_esc()
1565 		if (*var != NUL && after_pathsep(dst, dst + c)  in expand_env_esc()
1587 	    if (src[0] == '\\' && src[1] != NUL)  in expand_env_esc()
1607     *dst = NUL;  in expand_env_esc()
1636     if (vimdir == NULL || *vimdir == NUL)  in vim_version_dir()
1677     if (wp != NULL && *wp == NUL)   // empty is the same as not set  in vim_getenv()
1691     if (p != NULL && *p == NUL)	    // empty is the same as not set  in vim_getenv()
1723 	    && *default_vimruntime_dir == NUL  in vim_getenv()
1730 	if (wp != NULL && *wp == NUL)	    // empty is the same as not set  in vim_getenv()
1745 	if (p != NULL && *p == NUL)	    // empty is the same as not set  in vim_getenv()
1850 	if (vimruntime && *default_vimruntime_dir != NUL)  in vim_getenv()
1855 	else if (*default_vim_dir != NUL)  in vim_getenv()
1944     if (*val != NUL && STRICMP(name, "VIMRUNTIME") == 0)  in vim_setenv()
1986 	if (str[n] == '=' || str[n] == NUL)  in get_env_name()
1990     name[n] = NUL;  in get_env_name()
2005     if (user_copy == NULL || *user_copy == NUL || ga_grow(&ga_users, 1) == FAIL)  in add_user()
2063 	if (user_env != NULL && *user_env != NUL)  in init_users()
2340 	    if (buffer[i] == NUL)  in get_cmd_output()
2343 	buffer[len] = NUL;	// make sure the buffer is terminated  in get_cmd_output()
2412 		for (p = ml_get_buf(buf, lnum, FALSE); *p != NUL; ++p)  in get_cmd_output_as_rettv()
2413 		    if (putc(*p == '\n' ? NUL : *p, fd) == EOF)  in get_cmd_output_as_rettv()
2488 		*p = *start == NUL ? NL : *start;  in get_cmd_output_as_rettv()
2489 	    *p = NUL;  in get_cmd_output_as_rettv()
2522 	    *d = NUL;  in get_cmd_output_as_rettv()
2592     if (*p == NUL)  in get_isolated_shell_name()