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/****************************************************************************
* Copyright (c) 1998-2007,2008 Free Software Foundation, Inc. *
* *
* Permission is hereby granted, free of charge, to any person obtaining a *
* copy of this software and associated documentation files (the *
* "Software"), to deal in the Software without restriction, including *
* without limitation the rights to use, copy, modify, merge, publish, *
* distribute, distribute with modifications, sublicense, and/or sell *
* copies of the Software, and to permit persons to whom the Software is *
* furnished to do so, subject to the following conditions: *
* *
* The above copyright notice and this permission notice shall be included *
* in all copies or substantial portions of the Software. *
* *
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
* IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
* THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
* *
* Except as contained in this notice, the name(s) of the above copyright *
* holders shall not be used in advertising or otherwise to promote the *
* sale, use or other dealings in this Software without prior written *
* authorization. *
****************************************************************************/
/****************************************************************************
* Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 *
* and: Eric S. Raymond <esr@snark.thyrsus.com> *
* and: Thomas E. Dickey, 1996 on *
****************************************************************************/
/*
* tparm.c
*
*/
#include <curses.priv.h>
#include <ctype.h>
#include <term.h>
#include <tic.h>
MODULE_ID("$Id: lib_tparm.c,v 1.76 2008/08/16 19:22:55 tom Exp $")
/*
* char *
* tparm(string, ...)
*
* Substitute the given parameters into the given string by the following
* rules (taken from terminfo(5)):
*
* Cursor addressing and other strings requiring parame-
* ters in the terminal are described by a parameterized string
* capability, with like escapes %x in it. For example, to
* address the cursor, the cup capability is given, using two
* parameters: the row and column to address to. (Rows and
* columns are numbered from zero and refer to the physical
* screen visible to the user, not to any unseen memory.) If
* the terminal has memory relative cursor addressing, that can
* be indicated by
*
* The parameter mechanism uses a stack and special %
* codes to manipulate it. Typically a sequence will push one
* of the parameters onto the stack and then print it in some
* format. Often more complex operations are necessary.
*
* The % encodings have the following meanings:
*
* %% outputs `%'
* %c print pop() like %c in printf()
* %s print pop() like %s in printf()
* %[[:]flags][width[.precision]][doxXs]
* as in printf, flags are [-+#] and space
* The ':' is used to avoid making %+ or %-
* patterns (see below).
*
* %p[1-9] push ith parm
* %P[a-z] set dynamic variable [a-z] to pop()
* %g[a-z] get dynamic variable [a-z] and push it
* %P[A-Z] set static variable [A-Z] to pop()
* %g[A-Z] get static variable [A-Z] and push it
* %l push strlen(pop)
* %'c' push char constant c
* %{nn} push integer constant nn
*
* %+ %- %* %/ %m
* arithmetic (%m is mod): push(pop() op pop())
* %& %| %^ bit operations: push(pop() op pop())
* %= %> %< logical operations: push(pop() op pop())
* %A %O logical and & or operations for conditionals
* %! %~ unary operations push(op pop())
* %i add 1 to first two parms (for ANSI terminals)
*
* %? expr %t thenpart %e elsepart %;
* if-then-else, %e elsepart is optional.
* else-if's are possible ala Algol 68:
* %? c1 %t b1 %e c2 %t b2 %e c3 %t b3 %e c4 %t b4 %e b5 %;
*
* For those of the above operators which are binary and not commutative,
* the stack works in the usual way, with
* %gx %gy %m
* resulting in x mod y, not the reverse.
*/
NCURSES_EXPORT_VAR(int) _nc_tparm_err = 0;
#define TPS(var) _nc_prescreen.tparm_state.var
#if NO_LEAKS
NCURSES_EXPORT(void)
_nc_free_tparm(void)
{
if (TPS(out_buff) != 0) {
FreeAndNull(TPS(out_buff));
TPS(out_size) = 0;
TPS(out_used) = 0;
FreeAndNull(TPS(fmt_buff));
TPS(fmt_size) = 0;
}
}
#endif
static NCURSES_INLINE void
get_space(size_t need)
{
need += TPS(out_used);
if (need > TPS(out_size)) {
TPS(out_size) = need * 2;
TPS(out_buff) = typeRealloc(char, TPS(out_size), TPS(out_buff));
if (TPS(out_buff) == 0)
_nc_err_abort(MSG_NO_MEMORY);
}
}
static NCURSES_INLINE void
save_text(const char *fmt, const char *s, int len)
{
size_t s_len = strlen(s);
if (len > (int) s_len)
s_len = len;
get_space(s_len + 1);
(void) sprintf(TPS(out_buff) + TPS(out_used), fmt, s);
TPS(out_used) += strlen(TPS(out_buff) + TPS(out_used));
}
static NCURSES_INLINE void
save_number(const char *fmt, int number, int len)
{
if (len < 30)
len = 30; /* actually log10(MAX_INT)+1 */
get_space((unsigned) len + 1);
(void) sprintf(TPS(out_buff) + TPS(out_used), fmt, number);
TPS(out_used) += strlen(TPS(out_buff) + TPS(out_used));
}
static NCURSES_INLINE void
save_char(int c)
{
if (c == 0)
c = 0200;
get_space(1);
TPS(out_buff)[TPS(out_used)++] = (char) c;
}
static NCURSES_INLINE void
npush(int x)
{
if (TPS(stack_ptr) < STACKSIZE) {
TPS(stack)[TPS(stack_ptr)].num_type = TRUE;
TPS(stack)[TPS(stack_ptr)].data.num = x;
TPS(stack_ptr)++;
} else {
DEBUG(2, ("npush: stack overflow: %s", _nc_visbuf(TPS(tparam_base))));
_nc_tparm_err++;
}
}
static NCURSES_INLINE int
npop(void)
{
int result = 0;
if (TPS(stack_ptr) > 0) {
TPS(stack_ptr)--;
if (TPS(stack)[TPS(stack_ptr)].num_type)
result = TPS(stack)[TPS(stack_ptr)].data.num;
} else {
DEBUG(2, ("npop: stack underflow: %s", _nc_visbuf(TPS(tparam_base))));
_nc_tparm_err++;
}
return result;
}
static NCURSES_INLINE void
spush(char *x)
{
if (TPS(stack_ptr) < STACKSIZE) {
TPS(stack)[TPS(stack_ptr)].num_type = FALSE;
TPS(stack)[TPS(stack_ptr)].data.str = x;
TPS(stack_ptr)++;
} else {
DEBUG(2, ("spush: stack overflow: %s", _nc_visbuf(TPS(tparam_base))));
_nc_tparm_err++;
}
}
static NCURSES_INLINE char *
spop(void)
{
static char dummy[] = ""; /* avoid const-cast */
char *result = dummy;
if (TPS(stack_ptr) > 0) {
TPS(stack_ptr)--;
if (!TPS(stack)[TPS(stack_ptr)].num_type
&& TPS(stack)[TPS(stack_ptr)].data.str != 0)
result = TPS(stack)[TPS(stack_ptr)].data.str;
} else {
DEBUG(2, ("spop: stack underflow: %s", _nc_visbuf(TPS(tparam_base))));
_nc_tparm_err++;
}
return result;
}
static NCURSES_INLINE const char *
parse_format(const char *s, char *format, int *len)
{
*len = 0;
if (format != 0) {
bool done = FALSE;
bool allowminus = FALSE;
bool dot = FALSE;
bool err = FALSE;
char *fmt = format;
int my_width = 0;
int my_prec = 0;
int value = 0;
*len = 0;
*format++ = '%';
while (*s != '\0' && !done) {
switch (*s) {
case 'c': /* FALLTHRU */
case 'd': /* FALLTHRU */
case 'o': /* FALLTHRU */
case 'x': /* FALLTHRU */
case 'X': /* FALLTHRU */
case 's':
*format++ = *s;
done = TRUE;
break;
case '.':
*format++ = *s++;
if (dot) {
err = TRUE;
} else { /* value before '.' is the width */
dot = TRUE;
my_width = value;
}
value = 0;
break;
case '#':
*format++ = *s++;
break;
case ' ':
*format++ = *s++;
break;
case ':':
s++;
allowminus = TRUE;
break;
case '-':
if (allowminus) {
*format++ = *s++;
} else {
done = TRUE;
}
break;
default:
if (isdigit(UChar(*s))) {
value = (value * 10) + (*s - '0');
if (value > 10000)
err = TRUE;
*format++ = *s++;
} else {
done = TRUE;
}
}
}
/*
* If we found an error, ignore (and remove) the flags.
*/
if (err) {
my_width = my_prec = value = 0;
format = fmt;
*format++ = '%';
*format++ = *s;
}
/*
* Any value after '.' is the precision. If we did not see '.', then
* the value is the width.
*/
if (dot)
my_prec = value;
else
my_width = value;
*format = '\0';
/* return maximum string length in print */
*len = (my_width > my_prec) ? my_width : my_prec;
}
return s;
}
#define isUPPER(c) ((c) >= 'A' && (c) <= 'Z')
#define isLOWER(c) ((c) >= 'a' && (c) <= 'z')
/*
* Analyze the string to see how many parameters we need from the varargs list,
* and what their types are. We will only accept string parameters if they
* appear as a %l or %s format following an explicit parameter reference (e.g.,
* %p2%s). All other parameters are numbers.
*
* 'number' counts coarsely the number of pop's we see in the string, and
* 'popcount' shows the highest parameter number in the string. We would like
* to simply use the latter count, but if we are reading termcap strings, there
* may be cases that we cannot see the explicit parameter numbers.
*/
NCURSES_EXPORT(int)
_nc_tparm_analyze(const char *string, char *p_is_s[NUM_PARM], int *popcount)
{
size_t len2;
int i;
int lastpop = -1;
int len;
int number = 0;
const char *cp = string;
static char dummy[] = "";
if (cp == 0)
return 0;
if ((len2 = strlen(cp)) > TPS(fmt_size)) {
TPS(fmt_size) = len2 + TPS(fmt_size) + 2;
TPS(fmt_buff) = typeRealloc(char, TPS(fmt_size), TPS(fmt_buff));
if (TPS(fmt_buff) == 0)
return 0;
}
memset(p_is_s, 0, sizeof(p_is_s[0]) * NUM_PARM);
*popcount = 0;
while ((cp - string) < (int) len2) {
if (*cp == '%') {
cp++;
cp = parse_format(cp, TPS(fmt_buff), &len);
switch (*cp) {
default:
break;
case 'd': /* FALLTHRU */
case 'o': /* FALLTHRU */
case 'x': /* FALLTHRU */
case 'X': /* FALLTHRU */
case 'c': /* FALLTHRU */
if (lastpop <= 0)
number++;
lastpop = -1;
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 NCURSES_INLINE char *
tparam_internal(const char *string, va_list ap)
{
char *p_is_s[NUM_PARM];
TPARM_ARG param[NUM_PARM];
int popcount;
int number;
int len;
int level;
int x, y;
int i;
const char *cp = string;
size_t len2;
if (cp == NULL)
return NULL;
TPS(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 (TPS(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, TPARM_ARG);
}
}
/*
* 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.
*/
TPS(stack_ptr) = 0;
if (popcount == 0) {
popcount = number;
for (i = number - 1; i >= 0; i--) {
if (p_is_s[i])
spush(p_is_s[i]);
else
npush(param[i]);
}
}
#ifdef TRACE
if (USE_TRACEF(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)"), TPS(tname), _nc_visbuf(cp), TPS(out_buff));
TPS(out_used) = 0;
_nc_unlock_global(tracef);
}
#endif /* TRACE */
while ((cp - string) < (int) len2) {
if (*cp != '%') {
save_char(UChar(*cp));
} else {
TPS(tparam_base) = cp++;
cp = parse_format(cp, TPS(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(TPS(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(TPS(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');
TPS(static_vars)[i] = npop();
} else if (isLOWER(*cp)) {
i = (UChar(*cp) - 'a');
TPS(dynamic_var)[i] = npop();
}
break;
case 'g':
cp++;
if (isUPPER(*cp)) {
i = (UChar(*cp) - 'A');
npush(TPS(static_vars)[i]);
} else if (isLOWER(*cp)) {
i = (UChar(*cp) - 'a');
npush(TPS(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);
TPS(out_buff)[TPS(out_used)] = '\0';
T((T_RETURN("%s"), _nc_visbuf(TPS(out_buff))));
return (TPS(out_buff));
}
#if NCURSES_TPARM_VARARGS
#define tparm_varargs tparm
#else
#define tparm_proto tparm
#endif
NCURSES_EXPORT(char *)
tparm_varargs(NCURSES_CONST char *string,...)
{
va_list ap;
char *result;
_nc_tparm_err = 0;
va_start(ap, string);
#ifdef TRACE
TPS(tname) = "tparm";
#endif /* TRACE */
result = tparam_internal(string, ap);
va_end(ap);
return result;
}
#if !NCURSES_TPARM_VARARGS
NCURSES_EXPORT(char *)
tparm_proto(NCURSES_CONST char *string,
TPARM_ARG a1,
TPARM_ARG a2,
TPARM_ARG a3,
TPARM_ARG a4,
TPARM_ARG a5,
TPARM_ARG a6,
TPARM_ARG a7,
TPARM_ARG a8,
TPARM_ARG a9)
{
return tparm_varargs(string, a1, a2, a3, a4, a5, a6, a7, a8, a9);
}
#endif /* NCURSES_TPARM_VARARGS */