lib_tparm.c

ncurses-5.4

		break;

	    case 'l':
	    case 's':
		if (lastpop > 0)
		    p_is_s[lastpop - 1] = dummy;
		++number;
		break;

	    case 'p':
		cp++;
		i = (UChar(*cp) - '0');
		if (i >= 0 && i <= NUM_PARM) {
		    lastpop = i;
		    if (lastpop > *popcount)
			*popcount = lastpop;
		}
		break;

	    case 'P':
		++number;
		++cp;
		break;

	    case 'g':
		cp++;
		break;

	    case S_QUOTE:
		cp += 2;
		lastpop = -1;
		break;

	    case L_BRACE:
		cp++;
		while (isdigit(UChar(*cp))) {
		    cp++;
		}
		break;

	    case '+':
	    case '-':
	    case '*':
	    case '/':
	    case 'm':
	    case 'A':
	    case 'O':
	    case '&':
	    case '|':
	    case '^':
	    case '=':
	    case '<':
	    case '>':
		lastpop = -1;
		number += 2;
		break;

	    case '!':
	    case '~':
		lastpop = -1;
		++number;
		break;

	    case 'i':
		/* will add 1 to first (usually two) parameters */
		break;
	    }
	}
	if (*cp != '\0')
	    cp++;
    }

    if (number > NUM_PARM)
	number = NUM_PARM;
    return number;
}

static inline char *
tparam_internal(const char *string, va_list ap)
{
#define NUM_VARS 26
    char *p_is_s[NUM_PARM];
    long param[NUM_PARM];
    int popcount;
    int number;
    int len;
    int level;
    int x, y;
    int i;
    const char *cp = string;
    size_t len2;
    static int dynamic_var[NUM_VARS];
    static int static_vars[NUM_VARS];

    if (cp == NULL)
	return NULL;

    out_used = 0;
    len2 = strlen(cp);

    /*
     * Find the highest parameter-number referred to in the format string.
     * Use this value to limit the number of arguments copied from the
     * variable-length argument list.
     */
    number = _nc_tparm_analyze(cp, p_is_s, &popcount);
    if (fmt_buff == 0)
	return NULL;

    for (i = 0; i < max(popcount, number); i++) {
	/*
	 * A few caps (such as plab_norm) have string-valued parms.
	 * We'll have to assume that the caller knows the difference, since
	 * a char* and an int may not be the same size on the stack.  The
	 * normal prototype for this uses 9 long's, which is consistent with
	 * our va_arg() usage.
	 */
	if (p_is_s[i] != 0) {
	    p_is_s[i] = va_arg(ap, char *);
	} else {
	    param[i] = va_arg(ap, long int);
	}
    }

    /*
     * This is a termcap compatibility hack.  If there are no explicit pop
     * operations in the string, load the stack in such a way that
     * successive pops will grab successive parameters.  That will make
     * the expansion of (for example) \E[%d;%dH work correctly in termcap
     * style, which means tparam() will expand termcap strings OK.
     */
    stack_ptr = 0;
    if (popcount == 0) {
	popcount = number;
	for (i = number - 1; i >= 0; i--)
	    npush(param[i]);
    }
#ifdef TRACE
    if (_nc_tracing & TRACE_CALLS) {
	for (i = 0; i < popcount; i++) {
	    if (p_is_s[i] != 0)
		save_text(", %s", _nc_visbuf(p_is_s[i]), 0);
	    else
		save_number(", %d", param[i], 0);
	}
	_tracef(T_CALLED("%s(%s%s)"), tname, _nc_visbuf(cp), out_buff);
	out_used = 0;
    }
#endif /* TRACE */

    while ((cp - string) < (int) len2) {
	if (*cp != '%') {
	    save_char(UChar(*cp));
	} else {
	    tparam_base = cp++;
	    cp = parse_format(cp, fmt_buff, &len);
	    switch (*cp) {
	    default:
		break;
	    case '%':
		save_char('%');
		break;

	    case 'd':		/* FALLTHRU */
	    case 'o':		/* FALLTHRU */
	    case 'x':		/* FALLTHRU */
	    case 'X':		/* FALLTHRU */
		save_number(fmt_buff, npop(), len);
		break;

	    case 'c':		/* FALLTHRU */
		save_char(npop());
		break;

	    case 'l':
		save_number("%d", (int) strlen(spop()), 0);
		break;

	    case 's':
		save_text(fmt_buff, spop(), len);
		break;

	    case 'p':
		cp++;
		i = (UChar(*cp) - '1');
		if (i >= 0 && i < NUM_PARM) {
		    if (p_is_s[i])
			spush(p_is_s[i]);
		    else
			npush(param[i]);
		}
		break;

	    case 'P':
		cp++;
		if (isUPPER(*cp)) {
		    i = (UChar(*cp) - 'A');
		    static_vars[i] = npop();
		} else if (isLOWER(*cp)) {
		    i = (UChar(*cp) - 'a');
		    dynamic_var[i] = npop();
		}
		break;

	    case 'g':
		cp++;
		if (isUPPER(*cp)) {
		    i = (UChar(*cp) - 'A');
		    npush(static_vars[i]);
		} else if (isLOWER(*cp)) {
		    i = (UChar(*cp) - 'a');
		    npush(dynamic_var[i]);
		}
		break;

	    case S_QUOTE:
		cp++;
		npush(UChar(*cp));
		cp++;
		break;

	    case L_BRACE:
		number = 0;
		cp++;
		while (isdigit(UChar(*cp))) {
		    number = (number * 10) + (UChar(*cp) - '0');
		    cp++;
		}
		npush(number);
		break;

	    case '+':
		npush(npop() + npop());
		break;

	    case '-':
		y = npop();
		x = npop();
		npush(x - y);
		break;

	    case '*':
		npush(npop() * npop());
		break;

	    case '/':
		y = npop();
		x = npop();
		npush(y ? (x / y) : 0);
		break;

	    case 'm':
		y = npop();
		x = npop();
		npush(y ? (x % y) : 0);
		break;

	    case 'A':
		npush(npop() && npop());
		break;

	    case 'O':
		npush(npop() || npop());
		break;

	    case '&':
		npush(npop() & npop());
		break;

	    case '|':
		npush(npop() | npop());
		break;

	    case '^':
		npush(npop() ^ npop());
		break;

	    case '=':
		y = npop();
		x = npop();
		npush(x == y);
		break;

	    case '<':
		y = npop();
		x = npop();
		npush(x < y);
		break;

	    case '>':
		y = npop();
		x = npop();
		npush(x > y);
		break;

	    case '!':
		npush(!npop());
		break;

	    case '~':
		npush(~npop());
		break;

	    case 'i':
		if (p_is_s[0] == 0)
		    param[0]++;
		if (p_is_s[1] == 0)
		    param[1]++;
		break;

	    case '?':
		break;

	    case 't':
		x = npop();
		if (!x) {
		    /* scan forward for %e or %; at level zero */
		    cp++;
		    level = 0;
		    while (*cp) {
			if (*cp == '%') {
			    cp++;
			    if (*cp == '?')
				level++;
			    else if (*cp == ';') {
				if (level > 0)
				    level--;
				else
				    break;
			    } else if (*cp == 'e' && level == 0)
				break;
			}

			if (*cp)
			    cp++;
		    }
		}
		break;

	    case 'e':
		/* scan forward for a %; at level zero */
		cp++;
		level = 0;
		while (*cp) {
		    if (*cp == '%') {
			cp++;
			if (*cp == '?')
			    level++;
			else if (*cp == ';') {
			    if (level > 0)
				level--;
			    else
				break;
			}
		    }

		    if (*cp)
			cp++;
		}
		break;

	    case ';':
		break;

	    }			/* endswitch (*cp) */
	}			/* endelse (*cp == '%') */

	if (*cp == '\0')
	    break;

	cp++;
    }				/* endwhile (*cp) */

    get_space(1);
    out_buff[out_used] = '\0';

    T((T_RETURN("%s"), _nc_visbuf(out_buff)));
    return (out_buff);
}

NCURSES_EXPORT(char *)
tparm(NCURSES_CONST char *string,...)
{
    va_list ap;
    char *result;

    _nc_tparm_err = 0;
    va_start(ap, string);
#ifdef TRACE
    tname = "tparm";
#endif /* TRACE */
    result = tparam_internal(string, ap);
    va_end(ap);
    return result;
}