dc: re-enable "tiny dc" implementation

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

2 files changed, 36 insertions, 58 deletions

diff --git a/miscutils/bc.c b/miscutils/bc.c
index 71945ff..26044af 100644
--- a/miscutils/bc.c
+++ b/miscutils/bc.c
@@ -94,17 +94,30 @@
 //config:	     Also note that, like the FreeBSD dc, extended registers are not
 //config:	     allowed unless the "-x" option is given.
 //config:
+//config:config FEATURE_DC_SMALL
+//config:	bool "Minimal dc implementation (4.2 kb), not using bc code base"
+//config:	depends on DC && !BC
+//config:	default y
+//config:
+//config:config FEATURE_DC_LIBM
+//config:	bool "Enable power and exp functions (requires libm)"
+//config:	default y
+//config:	depends on FEATURE_DC_SMALL
+//config:	help
+//config:	Enable power and exp functions.
+//config:	NOTE: This will require libm to be present for linking.
+//config:
 //config:config FEATURE_BC_SIGNALS
 //config:	bool "Enable bc/dc signal handling"
 //config:	default y
-//config:	depends on BC || DC
+//config:	depends on (BC || DC) && !FEATURE_DC_SMALL
 //config:	help
 //config:	Enable signal handling for bc and dc.
 //config:
 //config:config FEATURE_BC_LONG_OPTIONS
 //config:	bool "Enable bc/dc long options"
 //config:	default y
-//config:	depends on BC || DC
+//config:	depends on (BC || DC) && !FEATURE_DC_SMALL
 //config:	help
 //config:	Enable long options for bc and dc.
 
@@ -143,16 +156,16 @@
 //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, ~, divmod, |, "
-//usage:       "modular exponentiation,\n"
-//usage:       "p - print top of the stack (without popping),\n"
-//usage:       "f - print entire stack,\n"
-//usage:       "k - pop the value and set the precision.\n"
-//usage:       "i - pop the value and set input radix.\n"
-//usage:       "o - pop the value and set output radix.\n"
-//usage:       "Examples: 'dc 2 2 add p' -> 4, 'dc 8 8 mul 2 2 + / p' -> 16"
+//usage:#define dc_full_usage "\n"
+//usage:     "\nTiny RPN calculator. Operations:"
+//usage:     "\n+, add, -, sub, *, mul, /, div, %, mod, ^, exp, ~, divmod, |, "
+//usage:       "modular exponentiation,"
+//usage:     "\np - print top of the stack (without popping),"
+//usage:     "\nf - print entire stack,"
+//usage:     "\nk - pop the value and set the precision."
+//usage:     "\ni - pop the value and set input radix."
+//usage:     "\no - pop the value and set output radix."
+//usage:     "\nExamples: '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"
@@ -169,6 +182,10 @@
 #include "libbb.h"
 #include "common_bufsiz.h"
 
+#if ENABLE_FEATURE_DC_SMALL
+# include "dc.c"
+#else
+
 typedef enum BcStatus {
 	BC_STATUS_SUCCESS = 0,
 	BC_STATUS_FAILURE = 1,
@@ -7490,3 +7507,5 @@ int dc_main(int argc UNUSED_PARAM, char **argv)
 	return bc_vm_run(argv, "DC_LINE_LENGTH");
 }
 #endif
+
+#endif // not DC_SMALL
diff --git a/miscutils/dc.c b/miscutils/dc.c
index d58f97e..2289014 100644
--- a/miscutils/dc.c
+++ b/miscutils/dc.c
@@ -1,52 +1,12 @@
-#if 0 //TODO: use if bc is not selected
 /* vi: set sw=4 ts=4: */
 /*
  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  */
-	//config:config DC
-	//config:	bool "dc (4.2 kb)"
-	//config:	default y
-	//config:	help
-	//config:	Dc is a reverse-polish desk calculator which supports unlimited
-	//config:	precision arithmetic.
-	//config:
-	//config:config FEATURE_DC_LIBM
-	//config:	bool "Enable power and exp functions (requires libm)"
-	//config:	default y
-	//config:	depends on DC
-	//config:	help
-	//config:	Enable power and exp functions.
-	//config:	NOTE: This will require libm to be present for linking.
-
-	//applet:IF_DC(APPLET(dc, BB_DIR_USR_BIN, BB_SUID_DROP))
-
-	//kbuild:lib-$(CONFIG_DC) += dc.o
-
-	//usage:#define dc_trivial_usage
-	//usage:       "EXPRESSION..."
-	//usage:
-	//usage:#define dc_full_usage "\n\n"
-	//usage:       "Tiny RPN calculator. Operations:\n"
-	//usage:       "+, add, -, sub, *, mul, /, div, %, mod, "IF_FEATURE_DC_LIBM("**, exp, ")"and, or, not, xor,\n"
-	//usage:       "p - print top of the stack (without popping),\n"
-	//usage:       "f - print entire stack,\n"
-	//usage:       "o - pop the value and set output radix (must be 10, 16, 8 or 2).\n"
-	//usage:       "Examples: 'dc 2 2 add p' -> 4, 'dc 8 8 mul 2 2 + / p' -> 16"
-	//usage:
-	//usage:#define dc_example_usage
-	//usage:       "$ 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"
-
-#include "libbb.h"
-#include "common_bufsiz.h"
+
+/* config/applet/usage bits are in bc.c */
+
+//#include "libbb.h"
+//#include "common_bufsiz.h"
 #include <math.h>
 
 #if 0
@@ -303,4 +263,3 @@ int dc_main(int argc UNUSED_PARAM, char **argv)
 	}
 	return EXIT_SUCCESS;
 }
-#endif