[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/app/busybox/src/miscutils/dc.c b/ap/app/busybox/src/miscutils/dc.c
new file mode 100644
index 0000000..6bcfbe2
--- /dev/null
+++ b/ap/app/busybox/src/miscutils/dc.c
@@ -0,0 +1,281 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ */
+
+#include "libbb.h"
+#include <math.h>
+
+//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, "IF_FEATURE_DC_LIBM("**, exp, ")"and, or, not, xor,\n"
+//usage: "p - print top of the stack (without popping),\n"
+//usage: "f - print entire stack,\n"
+//usage: "o - pop the value and set output radix (must be 10, 16, 8 or 2).\n"
+//usage: "Examples: 'dc 2 2 add p' -> 4, 'dc 8 8 mul 2 2 + / p' -> 16"
+//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 {
+ unsigned pointer;
+ unsigned base;
+ double stack[1];
+} FIX_ALIASING;
+enum { STACK_SIZE = (COMMON_BUFSIZE - offsetof(struct globals, stack)) / sizeof(double) };
+#define G (*(struct globals*)&bb_common_bufsiz1)
+#define pointer (G.pointer )
+#define base (G.base )
+#define stack (G.stack )
+#define INIT_G() do { \
+ base = 10; \
+} while (0)
+
+
+static void push(double a)
+{
+ if (pointer >= STACK_SIZE)
+ bb_error_msg_and_die("stack overflow");
+ stack[pointer++] = a;
+}
+
+static double pop(void)
+{
+ if (pointer == 0)
+ bb_error_msg_and_die("stack underflow");
+ return stack[--pointer];
+}
+
+static void add(void)
+{
+ push(pop() + pop());
+}
+
+static void sub(void)
+{
+ double subtrahend = pop();
+
+ push(pop() - subtrahend);
+}
+
+static void mul(void)
+{
+ push(pop() * pop());
+}
+
+#if ENABLE_FEATURE_DC_LIBM
+static void power(void)
+{
+ double topower = pop();
+
+ push(pow(pop(), topower));
+}
+#endif
+
+static void divide(void)
+{
+ double divisor = pop();
+
+ push(pop() / divisor);
+}
+
+static void mod(void)
+{
+ data_t d = pop();
+
+ push((data_t) pop() % d);
+}
+
+static void and(void)
+{
+ push((data_t) pop() & (data_t) pop());
+}
+
+static void or(void)
+{
+ push((data_t) pop() | (data_t) pop());
+}
+
+static void eor(void)
+{
+ push((data_t) pop() ^ (data_t) pop());
+}
+
+static void not(void)
+{
+ push(~(data_t) pop());
+}
+
+static void set_output_base(void)
+{
+ 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)
+{
+ data_t x, i;
+
+ x = (data_t) print;
+ if (base == 10) {
+ if (x == print) /* exactly representable as unsigned integer */
+ printf("%"DATA_FMT"u\n", x);
+ else
+ printf("%g\n", print);
+ return;
+ }
+
+ switch (base) {
+ case 16:
+ printf("%"DATA_FMT"x\n", x);
+ break;
+ case 8:
+ printf("%"DATA_FMT"o\n", x);
+ break;
+ default: /* base 2 */
+ i = MAXINT(data_t) - (MAXINT(data_t) >> 1);
+ /* i is 100000...00000 */
+ 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)
+{
+ unsigned i = pointer;
+ while (i)
+ print_base(stack[--i]);
+}
+
+static void print_no_pop(void)
+{
+ print_base(stack[pointer-1]);
+}
+
+struct op {
+ const char name[4];
+ void (*function) (void);
+};
+
+static const struct op operators[] = {
+ {"+", add},
+ {"add", add},
+ {"-", sub},
+ {"sub", sub},
+ {"*", mul},
+ {"mul", mul},
+ {"/", divide},
+ {"div", divide},
+#if ENABLE_FEATURE_DC_LIBM
+ {"**", power},
+ {"exp", power},
+ {"pow", power},
+#endif
+ {"%", mod},
+ {"mod", mod},
+ {"and", and},
+ {"or", or},
+ {"not", not},
+ {"eor", eor},
+ {"xor", eor},
+ {"p", print_no_pop},
+ {"f", print_stack_no_pop},
+ {"o", set_output_base},
+};
+
+static void stack_machine(const char *argument)
+{
+ char *end;
+ double d;
+ const struct op *o;
+
+ d = strtod(argument, &end);
+ if (end != argument && *end == '\0') {
+ push(d);
+ return;
+ }
+
+ o = operators;
+ do {
+ if (strcmp(o->name, argument) == 0) {
+ o->function();
+ return;
+ }
+ o++;
+ } while (o != operators + ARRAY_SIZE(operators));
+
+ bb_error_msg_and_die("syntax error at '%s'", argument);
+}
+
+int dc_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int dc_main(int argc UNUSED_PARAM, char **argv)
+{
+ INIT_G();
+
+ argv++;
+ if (!argv[0]) {
+ /* take stuff from stdin if no args are given */
+ char *line;
+ char *cursor;
+ char *token;
+ while ((line = xmalloc_fgetline(stdin)) != NULL) {
+ cursor = line;
+ while (1) {
+ token = skip_whitespace(cursor);
+ if (*token == '\0')
+ break;
+ cursor = skip_non_whitespace(token);
+ if (*cursor != '\0')
+ *cursor++ = '\0';
+ stack_machine(token);
+ }
+ free(line);
+ }
+ } else {
+ // why? it breaks "dc -2 2 + p"
+ //if (argv[0][0] == '-')
+ // bb_show_usage();
+ do {
+ stack_machine(*argv);
+ } while (*++argv);
+ }
+ return EXIT_SUCCESS;
+}