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dc: support for bases 2 and 8, by Nate Case (ncase AT xes-inc.com)

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function                                             old     new   delta
print_base                                            87     176     +89
set_output_base                                       81      95     +14
static.bases                                           -       5      +5
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 2/0 up/down: 108/0)             Total: 108 bytes
This commit is contained in:
Denis Vlasenko 2008-10-30 23:25:50 +00:00
parent 470dc1d7e2
commit 6b38e18247
1 changed files with 32 additions and 6 deletions
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38
miscutils/dc.c
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@ -98,19 +98,45 @@ static void not(void)
static void set_output_base(void) static void set_output_base(void)
{ {
base = (unsigned)pop(); static const char bases[] ALIGN1 = { 2, 8, 10, 16, 0 };
if ((base != 10) && (base != 16)) { unsigned b = (unsigned)pop();
bb_error_msg("error, base %d is not supported", base);
base = *strchrnul(bases, b);
if (base == 0) {
bb_error_msg("error, base %u is not supported", b);
base = 10; base = 10;
} }
} }
static void print_base(double print) static void print_base(double print)
{ {
if (base == 16) unsigned x, i;
printf("%x\n", (unsigned)print);
else if (base == 10) {
printf("%g\n", print); printf("%g\n", print);
return;
}
x = (unsigned)print;
switch (base) {
case 16:
printf("%x\n", x);
break;
case 8:
printf("%o\n", x);
break;
default: /* base 2 */
i = (unsigned)INT_MAX + 1;
do {
if (x & i) break;
i >>= 1;
} while (i > 1);
do {
bb_putchar('1' - !(x & i));
i >>= 1;
} while (i);
bb_putchar('\n');
}
} }
static void print_stack_no_pop(void) static void print_stack_no_pop(void)