1 /****************************************************************************
2 * Copyright (c) 1998-2011,2012 Free Software Foundation, Inc. *
4 * Permission is hereby granted, free of charge, to any person obtaining a *
5 * copy of this software and associated documentation files (the *
6 * "Software"), to deal in the Software without restriction, including *
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8 * distribute, distribute with modifications, sublicense, and/or sell *
9 * copies of the Software, and to permit persons to whom the Software is *
10 * furnished to do so, subject to the following conditions: *
12 * The above copyright notice and this permission notice shall be included *
13 * in all copies or substantial portions of the Software. *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
18 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
21 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
23 * Except as contained in this notice, the name(s) of the above copyright *
24 * holders shall not be used in advertising or otherwise to promote the *
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27 ****************************************************************************/
29 /****************************************************************************
30 * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 *
31 * and: Eric S. Raymond <esr@snark.thyrsus.com> *
32 * and: Thomas E. Dickey, 1996 on *
33 ****************************************************************************/
40 #include <curses.priv.h>
45 MODULE_ID("$Id: lib_tparm.c,v 1.86 2012/02/22 22:40:24 tom Exp $")
51 * Substitute the given parameters into the given string by the following
52 * rules (taken from terminfo(5)):
54 * Cursor addressing and other strings requiring parame-
55 * ters in the terminal are described by a parameterized string
56 * capability, with like escapes %x in it. For example, to
57 * address the cursor, the cup capability is given, using two
58 * parameters: the row and column to address to. (Rows and
59 * columns are numbered from zero and refer to the physical
60 * screen visible to the user, not to any unseen memory.) If
61 * the terminal has memory relative cursor addressing, that can
64 * The parameter mechanism uses a stack and special %
65 * codes to manipulate it. Typically a sequence will push one
66 * of the parameters onto the stack and then print it in some
67 * format. Often more complex operations are necessary.
69 * The % encodings have the following meanings:
72 * %c print pop() like %c in printf()
73 * %s print pop() like %s in printf()
74 * %[[:]flags][width[.precision]][doxXs]
75 * as in printf, flags are [-+#] and space
76 * The ':' is used to avoid making %+ or %-
77 * patterns (see below).
79 * %p[1-9] push ith parm
80 * %P[a-z] set dynamic variable [a-z] to pop()
81 * %g[a-z] get dynamic variable [a-z] and push it
82 * %P[A-Z] set static variable [A-Z] to pop()
83 * %g[A-Z] get static variable [A-Z] and push it
85 * %'c' push char constant c
86 * %{nn} push integer constant nn
89 * arithmetic (%m is mod): push(pop() op pop())
90 * %& %| %^ bit operations: push(pop() op pop())
91 * %= %> %< logical operations: push(pop() op pop())
92 * %A %O logical and & or operations for conditionals
93 * %! %~ unary operations push(op pop())
94 * %i add 1 to first two parms (for ANSI terminals)
96 * %? expr %t thenpart %e elsepart %;
97 * if-then-else, %e elsepart is optional.
98 * else-if's are possible ala Algol 68:
99 * %? c1 %t b1 %e c2 %t b2 %e c3 %t b3 %e c4 %t b4 %e b5 %;
101 * For those of the above operators which are binary and not commutative,
102 * the stack works in the usual way, with
104 * resulting in x mod y, not the reverse.
107 NCURSES_EXPORT_VAR(int) _nc_tparm_err = 0;
109 #define TPS(var) _nc_prescreen.tparm_state.var
115 if (TPS(out_buff) != 0) {
116 FreeAndNull(TPS(out_buff));
119 FreeAndNull(TPS(fmt_buff));
125 static NCURSES_INLINE void
126 get_space(size_t need)
128 need += TPS(out_used);
129 if (need > TPS(out_size)) {
130 TPS(out_size) = need * 2;
131 TPS(out_buff) = typeRealloc(char, TPS(out_size), TPS(out_buff));
132 if (TPS(out_buff) == 0)
133 _nc_err_abort(MSG_NO_MEMORY);
137 static NCURSES_INLINE void
138 save_text(const char *fmt, const char *s, int len)
140 size_t s_len = strlen(s);
141 if (len > (int) s_len)
142 s_len = (size_t) len;
144 get_space(s_len + 1);
146 _nc_SPRINTF(TPS(out_buff) + TPS(out_used),
147 _nc_SLIMIT(TPS(out_size) - TPS(out_used))
149 TPS(out_used) += strlen(TPS(out_buff) + TPS(out_used));
152 static NCURSES_INLINE void
153 save_number(const char *fmt, int number, int len)
156 len = 30; /* actually log10(MAX_INT)+1 */
158 get_space((size_t) len + 1);
160 _nc_SPRINTF(TPS(out_buff) + TPS(out_used),
161 _nc_SLIMIT(TPS(out_size) - TPS(out_used))
163 TPS(out_used) += strlen(TPS(out_buff) + TPS(out_used));
166 static NCURSES_INLINE void
171 get_space((size_t) 1);
172 TPS(out_buff)[TPS(out_used)++] = (char) c;
175 static NCURSES_INLINE void
178 if (TPS(stack_ptr) < STACKSIZE) {
179 TPS(stack)[TPS(stack_ptr)].num_type = TRUE;
180 TPS(stack)[TPS(stack_ptr)].data.num = x;
183 DEBUG(2, ("npush: stack overflow: %s", _nc_visbuf(TPS(tparam_base))));
188 static NCURSES_INLINE int
192 if (TPS(stack_ptr) > 0) {
194 if (TPS(stack)[TPS(stack_ptr)].num_type)
195 result = TPS(stack)[TPS(stack_ptr)].data.num;
197 DEBUG(2, ("npop: stack underflow: %s", _nc_visbuf(TPS(tparam_base))));
203 static NCURSES_INLINE void
206 if (TPS(stack_ptr) < STACKSIZE) {
207 TPS(stack)[TPS(stack_ptr)].num_type = FALSE;
208 TPS(stack)[TPS(stack_ptr)].data.str = x;
211 DEBUG(2, ("spush: stack overflow: %s", _nc_visbuf(TPS(tparam_base))));
216 static NCURSES_INLINE char *
219 static char dummy[] = ""; /* avoid const-cast */
220 char *result = dummy;
221 if (TPS(stack_ptr) > 0) {
223 if (!TPS(stack)[TPS(stack_ptr)].num_type
224 && TPS(stack)[TPS(stack_ptr)].data.str != 0)
225 result = TPS(stack)[TPS(stack_ptr)].data.str;
227 DEBUG(2, ("spop: stack underflow: %s", _nc_visbuf(TPS(tparam_base))));
233 static NCURSES_INLINE const char *
234 parse_format(const char *s, char *format, int *len)
239 bool allowminus = FALSE;
249 while (*s != '\0' && !done) {
251 case 'c': /* FALLTHRU */
252 case 'd': /* FALLTHRU */
253 case 'o': /* FALLTHRU */
254 case 'x': /* FALLTHRU */
255 case 'X': /* FALLTHRU */
264 } else { /* value before '.' is the width */
288 if (isdigit(UChar(*s))) {
289 value = (value * 10) + (*s - '0');
300 * If we found an error, ignore (and remove) the flags.
303 my_width = my_prec = value = 0;
310 * Any value after '.' is the precision. If we did not see '.', then
311 * the value is the width.
319 /* return maximum string length in print */
320 *len = (my_width > my_prec) ? my_width : my_prec;
325 #define isUPPER(c) ((c) >= 'A' && (c) <= 'Z')
326 #define isLOWER(c) ((c) >= 'a' && (c) <= 'z')
329 * Analyze the string to see how many parameters we need from the varargs list,
330 * and what their types are. We will only accept string parameters if they
331 * appear as a %l or %s format following an explicit parameter reference (e.g.,
332 * %p2%s). All other parameters are numbers.
334 * 'number' counts coarsely the number of pop's we see in the string, and
335 * 'popcount' shows the highest parameter number in the string. We would like
336 * to simply use the latter count, but if we are reading termcap strings, there
337 * may be cases that we cannot see the explicit parameter numbers.
340 _nc_tparm_analyze(const char *string, char *p_is_s[NUM_PARM], int *popcount)
347 const char *cp = string;
348 static char dummy[] = "";
353 if ((len2 = strlen(cp)) > TPS(fmt_size)) {
354 TPS(fmt_size) = len2 + TPS(fmt_size) + 2;
355 TPS(fmt_buff) = typeRealloc(char, TPS(fmt_size), TPS(fmt_buff));
356 if (TPS(fmt_buff) == 0)
360 memset(p_is_s, 0, sizeof(p_is_s[0]) * NUM_PARM);
363 while ((cp - string) < (int) len2) {
366 cp = parse_format(cp, TPS(fmt_buff), &len);
371 case 'd': /* FALLTHRU */
372 case 'o': /* FALLTHRU */
373 case 'x': /* FALLTHRU */
374 case 'X': /* FALLTHRU */
375 case 'c': /* FALLTHRU */
384 p_is_s[lastpop - 1] = dummy;
390 i = (UChar(*cp) - '0');
391 if (i >= 0 && i <= NUM_PARM) {
393 if (lastpop > *popcount)
414 while (isdigit(UChar(*cp))) {
443 /* will add 1 to first (usually two) parameters */
451 if (number > NUM_PARM)
456 static NCURSES_INLINE char *
457 tparam_internal(int use_TPARM_ARG, const char *string, va_list ap)
459 char *p_is_s[NUM_PARM];
460 TPARM_ARG param[NUM_PARM];
468 const char *cp = string;
478 * Find the highest parameter-number referred to in the format string.
479 * Use this value to limit the number of arguments copied from the
480 * variable-length argument list.
482 number = _nc_tparm_analyze(cp, p_is_s, &popcount);
483 if (TPS(fmt_buff) == 0)
486 if (number > NUM_PARM)
488 if (popcount > NUM_PARM)
490 num_args = max(popcount, number);
492 for (i = 0; i < num_args; i++) {
494 * A few caps (such as plab_norm) have string-valued parms.
495 * We'll have to assume that the caller knows the difference, since
496 * a char* and an int may not be the same size on the stack. The
497 * normal prototype for this uses 9 long's, which is consistent with
498 * our va_arg() usage.
500 if (p_is_s[i] != 0) {
501 p_is_s[i] = va_arg(ap, char *);
503 } else if (use_TPARM_ARG) {
504 param[i] = va_arg(ap, TPARM_ARG);
506 param[i] = (TPARM_ARG) va_arg(ap, int);
511 * This is a termcap compatibility hack. If there are no explicit pop
512 * operations in the string, load the stack in such a way that
513 * successive pops will grab successive parameters. That will make
514 * the expansion of (for example) \E[%d;%dH work correctly in termcap
515 * style, which means tparam() will expand termcap strings OK.
520 for (i = number - 1; i >= 0; i--) {
524 npush((int) param[i]);
528 if (USE_TRACEF(TRACE_CALLS)) {
529 for (i = 0; i < num_args; i++) {
531 save_text(", %s", _nc_visbuf(p_is_s[i]), 0);
533 save_number(", %d", (int) param[i], 0);
535 _tracef(T_CALLED("%s(%s%s)"), TPS(tname), _nc_visbuf(cp), TPS(out_buff));
537 _nc_unlock_global(tracef);
541 while ((cp - string) < (int) len2) {
543 save_char(UChar(*cp));
545 TPS(tparam_base) = cp++;
546 cp = parse_format(cp, TPS(fmt_buff), &len);
554 case 'd': /* FALLTHRU */
555 case 'o': /* FALLTHRU */
556 case 'x': /* FALLTHRU */
557 case 'X': /* FALLTHRU */
558 save_number(TPS(fmt_buff), npop(), len);
561 case 'c': /* FALLTHRU */
566 save_number("%d", (int) strlen(spop()), 0);
570 save_text(TPS(fmt_buff), spop(), len);
575 i = (UChar(*cp) - '1');
576 if (i >= 0 && i < NUM_PARM) {
580 npush((int) param[i]);
587 i = (UChar(*cp) - 'A');
588 TPS(static_vars)[i] = npop();
589 } else if (isLOWER(*cp)) {
590 i = (UChar(*cp) - 'a');
591 TPS(dynamic_var)[i] = npop();
598 i = (UChar(*cp) - 'A');
599 npush(TPS(static_vars)[i]);
600 } else if (isLOWER(*cp)) {
601 i = (UChar(*cp) - 'a');
602 npush(TPS(dynamic_var)[i]);
615 while (isdigit(UChar(*cp))) {
616 number = (number * 10) + (UChar(*cp) - '0');
623 npush(npop() + npop());
633 npush(npop() * npop());
639 npush(y ? (x / y) : 0);
645 npush(y ? (x % y) : 0);
649 npush(npop() && npop());
653 npush(npop() || npop());
657 npush(npop() & npop());
661 npush(npop() | npop());
665 npush(npop() ^ npop());
707 /* scan forward for %e or %; at level zero */
715 else if (*cp == ';') {
720 } else if (*cp == 'e' && level == 0)
731 /* scan forward for a %; at level zero */
739 else if (*cp == ';') {
755 } /* endswitch (*cp) */
756 } /* endelse (*cp == '%') */
762 } /* endwhile (*cp) */
764 get_space((size_t) 1);
765 TPS(out_buff)[TPS(out_used)] = '\0';
767 T((T_RETURN("%s"), _nc_visbuf(TPS(out_buff))));
768 return (TPS(out_buff));
771 #if NCURSES_TPARM_VARARGS
772 #define tparm_varargs tparm
774 #define tparm_proto tparm
777 NCURSES_EXPORT(char *)
778 tparm_varargs(NCURSES_CONST char *string,...)
784 va_start(ap, string);
786 TPS(tname) = "tparm";
788 result = tparam_internal(TRUE, string, ap);
793 #if !NCURSES_TPARM_VARARGS
794 NCURSES_EXPORT(char *)
795 tparm_proto(NCURSES_CONST char *string,
806 return tparm_varargs(string, a1, a2, a3, a4, a5, a6, a7, a8, a9);
808 #endif /* NCURSES_TPARM_VARARGS */
810 NCURSES_EXPORT(char *)
811 tiparm(const char *string,...)
817 va_start(ap, string);
819 TPS(tname) = "tiparm";
821 result = tparam_internal(FALSE, string, ap);