dc: make it use long longs for integer ops

function                                             old     new   delta
print_base                                           176     238     +62
or                                                    91     103     +12
eor                                                   91     103     +12
and                                                   91     103     +12
not                                                   60      64      +4
mod                                                  103     105      +2
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 6/0 up/down: 104/0)             Total: 104 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

2 files changed, 51 insertions, 36 deletions

diff --git a/include/usage.src.h b/include/usage.src.h
index 9b326eebb..0053a7c4b 100644
--- a/include/usage.src.h
+++ b/include/usage.src.h
@@ -736,28 +736,6 @@ INSERT
        "$ date\n" \
        "Wed Apr 12 18:52:41 MDT 2000\n"
 
-#define dc_trivial_usage \
-       "expression..."
-#define dc_full_usage "\n\n" \
-       "Tiny RPN calculator. Operations:\n" \
-       "+, add, -, sub, *, mul, /, div, %, mod, **, exp, and, or, not, eor,\n" \
-       "p - print top of the stack (without altering the stack),\n" \
-       "f - print entire stack, o - pop the value and set output radix\n" \
-       "(value must be 10 or 16).\n" \
-       "Examples: 'dc 2 2 add' -> 4, 'dc 8 8 * 2 2 + /' -> 16\n" \
-
-#define dc_example_usage \
-       "$ dc 2 2 + p\n" \
-       "4\n" \
-       "$ dc 8 8 \\* 2 2 + / p\n" \
-       "16\n" \
-       "$ dc 0 1 and p\n" \
-       "0\n" \
-       "$ dc 0 1 or p\n" \
-       "1\n" \
-       "$ echo 72 9 div 8 mul p | dc\n" \
-       "64\n"
-
 #define dd_trivial_usage \
        "[if=FILE] [of=FILE] " IF_FEATURE_DD_IBS_OBS("[ibs=N] [obs=N] ") "[bs=N] [count=N] [skip=N]\n" \
        "        [seek=N]" IF_FEATURE_DD_IBS_OBS(" [conv=notrunc|noerror|sync|fsync]")
diff --git a/miscutils/dc.c b/miscutils/dc.c
index cb4b1e9b1..ebf357281 100644
--- a/miscutils/dc.c
+++ b/miscutils/dc.c
@@ -6,7 +6,39 @@
 #include "libbb.h"
 #include <math.h>
 
-/* Tiny RPN calculator, because "expr" didn't give me bitwise operations. */
+//usage:#define dc_trivial_usage
+//usage:       "expression..."
+//usage:
+//usage:#define dc_full_usage "\n\n"
+//usage:       "Tiny RPN calculator. Operations:\n"
+//usage:       "+, add, -, sub, *, mul, /, div, %, mod, **, exp, and, or, not, eor,\n"
+//usage:       "p - print top of the stack (without popping),\n"
+//usage:       "f - print entire stack, o - pop the value and set output radix\n"
+//usage:       "(value must be 10, 16, 8 or 2).\n"
+//usage:       "Examples: 'dc 2 2 add' -> 4, 'dc 8 8 * 2 2 + /' -> 16\n"
+//usage:
+//usage:#define dc_example_usage
+//usage:       "$ dc 2 2 + p\n"
+//usage:       "4\n"
+//usage:       "$ dc 8 8 \\* 2 2 + / p\n"
+//usage:       "16\n"
+//usage:       "$ dc 0 1 and p\n"
+//usage:       "0\n"
+//usage:       "$ dc 0 1 or p\n"
+//usage:       "1\n"
+//usage:       "$ echo 72 9 div 8 mul p | dc\n"
+//usage:       "64\n"
+
+#if 0
+typedef unsigned data_t;
+#define DATA_FMT ""
+#elif 0
+typedef unsigned long data_t;
+#define DATA_FMT "l"
+#else
+typedef unsigned long long data_t;
+#define DATA_FMT "ll"
+#endif
 
 
 struct globals {
@@ -73,29 +105,29 @@ static void divide(void)
 
 static void mod(void)
 {
-        unsigned d = pop();
+        data_t d = pop();
 
-        push((unsigned) pop() % d);
+        push((data_t) pop() % d);
 }
 
 static void and(void)
 {
-        push((unsigned) pop() & (unsigned) pop());
+        push((data_t) pop() & (data_t) pop());
 }
 
 static void or(void)
 {
-        push((unsigned) pop() | (unsigned) pop());
+        push((data_t) pop() | (data_t) pop());
 }
 
 static void eor(void)
 {
-        push((unsigned) pop() ^ (unsigned) pop());
+        push((data_t) pop() ^ (data_t) pop());
 }
 
 static void not(void)
 {
-        push(~(unsigned) pop());
+        push(~(data_t) pop());
 }
 
 static void set_output_base(void)
@@ -112,25 +144,30 @@ static void set_output_base(void)
 
 static void print_base(double print)
 {
-        unsigned x, i;
+        data_t x, i;
 
+        x = (data_t) print;
         if (base == 10) {
-                printf("%g\n", print);
+                if (x == print) /* exactly representable as unsigned integer */
+                        printf("%"DATA_FMT"u\n", x);
+                else
+                        printf("%g\n", print);
                 return;
         }
 
-        x = (unsigned)print;
         switch (base) {
         case 16:
-                printf("%x\n", x);
+                printf("%"DATA_FMT"x\n", x);
                 break;
         case 8:
-                printf("%o\n", x);
+                printf("%"DATA_FMT"o\n", x);
                 break;
         default: /* base 2 */
-                i = (unsigned)INT_MAX + 1;
+                i = MAXINT(data_t) - (MAXINT(data_t) >> 1);
+                /* i is 100000...00000 */
                 do {
-                        if (x & i) break;
+                        if (x & i)
+                                break;
                         i >>= 1;
                 } while (i > 1);
                 do {