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/****************************************************************************
* Copyright (c) 1998,2000,2002 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. *
****************************************************************************/
/**********************************************************************
* This code is a modification of lib_tparm.c found in ncurses-5.2. The
* modification are for use in grub by replacing all libc function through
* special grub functions. This also meant to delete all dynamic memory
* allocation and replace it by a number of fixed buffers.
*
* Modifications by Tilmann Bubeck <t.bubeck@reinform.de> 2002
**********************************************************************/
/****************************************************************************
* Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 *
* and: Eric S. Raymond <esr@snark.thyrsus.com> *
****************************************************************************/
/*
* tparm.c
*
*/
#include "shared.h"
#include "tparm.h"
/*
* Common/troublesome character definitions
*/
typedef char grub_bool;
#define isdigit(c) ((c) >= '0' && (c) <= '9')
#ifndef FALSE
# define FALSE (0)
#endif
#ifndef TRUE
# define TRUE (!FALSE)
#endif
#define MAX_FORMAT_LEN 256
#define max(a,b) ((a) > (b) ? (a) : (b))
//MODULE_ID("$Id$")
/*
* 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.
*/
#define STACKSIZE 20
typedef struct {
union {
unsigned int num;
char *str;
} data;
grub_bool num_type;
} stack_frame;
static stack_frame stack[STACKSIZE];
static int stack_ptr;
static char out_buff[256];
static int out_size = 256;
static int out_used;
static inline void
get_space(int need)
{
need += out_used;
if (need > out_size) {
// FIX ME! buffer full, what now?
;
}
}
static inline void
save_text(const char *fmt, const char *s, int len)
{
int s_len = grub_strlen(s);
if (len > (int) s_len)
s_len = len;
get_space(s_len + 1);
(void) grub_sprintf(out_buff + out_used, fmt, s);
out_used += grub_strlen(out_buff + out_used);
}
static inline void
save_number(const char *fmt, int number, int len)
{
if (len < 30)
len = 30; /* actually log10(MAX_INT)+1 */
get_space(len + 1);
(void) grub_sprintf(out_buff + out_used, fmt, number);
out_used += grub_strlen(out_buff + out_used);
}
static inline void
save_char(int c)
{
if (c == 0)
c = 0200;
get_space(1);
out_buff[out_used++] = c;
}
static inline void
npush(int x)
{
if (stack_ptr < STACKSIZE) {
stack[stack_ptr].num_type = TRUE;
stack[stack_ptr].data.num = x;
stack_ptr++;
}
}
static inline int
npop(void)
{
int result = 0;
if (stack_ptr > 0) {
stack_ptr--;
if (stack[stack_ptr].num_type)
result = stack[stack_ptr].data.num;
}
return result;
}
static inline void
spush(char *x)
{
if (stack_ptr < STACKSIZE) {
stack[stack_ptr].num_type = FALSE;
stack[stack_ptr].data.str = x;
stack_ptr++;
}
}
static inline char *
spop(void)
{
static char dummy[] = ""; /* avoid const-cast */
char *result = dummy;
if (stack_ptr > 0) {
stack_ptr--;
if (!stack[stack_ptr].num_type && stack[stack_ptr].data.str != 0)
result = stack[stack_ptr].data.str;
}
return result;
}
static inline const char *
parse_format(const char *s, char *format, int *len)
{
grub_bool done = FALSE;
grub_bool allowminus = FALSE;
grub_bool dot = FALSE;
grub_bool err = FALSE;
char *fmt = format;
int prec = 0;
int width = 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 {
dot = TRUE;
prec = 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(*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) {
prec = width = value = 0;
format = fmt;
*format++ = '%';
*format++ = *s;
}
if (dot)
width = value;
else
prec = value;
*format = '\0';
/* return maximum string length in print */
*len = (prec > width) ? prec : width;
return s;
}
#define isUPPER(c) ((c) >= 'A' && (c) <= 'Z')
#define isLOWER(c) ((c) >= 'a' && (c) <= 'z')
static inline char *
tparam_internal(const char *string, int *dataptr)
{
#define NUM_VARS 26
char *p_is_s[9];
int param[9];
int lastpop;
int popcount;
int number;
int len;
int level;
int x, y;
int i;
int len2;
register const char *cp;
static int len_fmt = MAX_FORMAT_LEN;
static char dummy[] = "";
static char format[MAX_FORMAT_LEN];
static int dynamic_var[NUM_VARS];
static int static_vars[NUM_VARS];
out_used = 0;
if (string == NULL)
return NULL;
if ((len2 = grub_strlen(string)) > len_fmt) {
return NULL;
}
/*
* 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 = 0;
lastpop = -1;
popcount = 0;
grub_memset(p_is_s, 0, sizeof(p_is_s));
/*
* 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.
*/
for (cp = string; (cp - string) < (int) len2;) {
if (*cp == '%') {
cp++;
cp = parse_format(cp, format, &len);
switch (*cp) {
default:
break;
case 'd': /* FALLTHRU */
case 'o': /* FALLTHRU */
case 'x': /* FALLTHRU */
case 'X': /* FALLTHRU */
case 'c': /* FALLTHRU */
number++;
lastpop = -1;
break;
case 'l':
case 's':
if (lastpop > 0)
p_is_s[lastpop - 1] = dummy;
++number;
break;
case 'p':
cp++;
i = (*cp - '0');
if (i >= 0 && i <= 9) {
lastpop = i;
if (lastpop > popcount)
popcount = lastpop;
}
break;
case 'P':
case 'g':
cp++;
break;
case '\'':
cp += 2;
lastpop = -1;
break;
case '{':
cp++;
while (*cp >= '0' && *cp <= '9') {
cp++;
}
break;
case '+':
case '-':
case '*':
case '/':
case 'm':
case 'A':
case 'O':
case '&':
case '|':
case '^':
case '=':
case '<':
case '>':
case '!':
case '~':
lastpop = -1;
number += 2;
break;
case 'i':
lastpop = -1;
if (popcount < 2)
popcount = 2;
break;
}
}
if (*cp != '\0')
cp++;
}
if (number > 9)
number = 9;
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.
*/
if (p_is_s[i] != 0) {
p_is_s[i] = (char *)(*(dataptr++));
} else {
param[i] = (int)(*(dataptr++));
}
}
/*
* 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]);
}
while (*string) {
/* skip delay timings */
if (*string == '$' && *(string + 1) == '<') {
while( *string && *string != '>')
string++;
if ( *string == '>' ) string++;
} else if ( *string == '%') {
string++;
string = parse_format(string, format, &len);
switch (*string) {
default:
break;
case '%':
save_char('%');
break;
case 'd': /* FALLTHRU */
case 'o': /* FALLTHRU */
case 'x': /* FALLTHRU */
case 'X': /* FALLTHRU */
case 'c': /* FALLTHRU */
save_number(format, npop(), len);
break;
case 'l':
save_number("%d", strlen(spop()), 0);
break;
case 's':
save_text(format, spop(), len);
break;
case 'p':
string++;
i = (*string - '1');
if (i >= 0 && i < 9) {
if (p_is_s[i])
spush(p_is_s[i]);
else
npush(param[i]);
}
break;
case 'P':
string++;
if (isUPPER(*string)) {
i = (*string - 'A');
static_vars[i] = npop();
} else if (isLOWER(*string)) {
i = (*string - 'a');
dynamic_var[i] = npop();
}
break;
case 'g':
string++;
if (isUPPER(*string)) {
i = (*string - 'A');
npush(static_vars[i]);
} else if (isLOWER(*string)) {
i = (*string - 'a');
npush(dynamic_var[i]);
}
break;
case '\'':
string++;
npush(*string);
string++;
break;
case '{':
number = 0;
string++;
while (*string >= '0' && *string <= '9') {
number = number * 10 + *string - '0';
string++;
}
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 */
string++;
level = 0;
while (*string) {
if (*string == '%') {
string++;
if (*string == '?')
level++;
else if (*string == ';') {
if (level > 0)
level--;
else
break;
} else if (*string == 'e' && level == 0)
break;
}
if (*string)
string++;
}
}
break;
case 'e':
/* scan forward for a %; at level zero */
string++;
level = 0;
while (*string) {
if (*string == '%') {
string++;
if (*string == '?')
level++;
else if (*string == ';') {
if (level > 0)
level--;
else
break;
}
}
if (*string)
string++;
}
break;
case ';':
break;
} /* endswitch (*string) */
} else { /* endelse (*string == '%') */
save_char(*string);
}
if (*string == '\0')
break;
string++;
} /* endwhile (*string) */
get_space(1);
out_buff[out_used] = '\0';
return (out_buff);
}
char *
grub_tparm(const char *string,...)
{
char *result;
int *dataptr = (int *)(void *) &string;
dataptr++;
result = tparam_internal(string, dataptr);
return result;
}