diff options
| -rw-r--r-- | miscutils/dc.c | 38 |
1 files changed, 32 insertions, 6 deletions
diff --git a/miscutils/dc.c b/miscutils/dc.c index 7d5886e..6d4efa9 100644 --- a/miscutils/dc.c +++ b/miscutils/dc.c @@ -98,19 +98,45 @@ static void not(void) static void set_output_base(void) { - base = (unsigned)pop(); - if ((base != 10) && (base != 16)) { - bb_error_msg("error, base %d is not supported", base); + static const char bases[] ALIGN1 = { 2, 8, 10, 16, 0 }; + unsigned b = (unsigned)pop(); + + base = *strchrnul(bases, b); + if (base == 0) { + bb_error_msg("error, base %u is not supported", b); base = 10; } } static void print_base(double print) { - if (base == 16) - printf("%x\n", (unsigned)print); - else + unsigned x, i; + + if (base == 10) { 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) |