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authorDenys Vlasenko <vda.linux@googlemail.com>2021-02-26 17:11:55 +0100
committerDenys Vlasenko <vda.linux@googlemail.com>2021-02-26 17:11:55 +0100
commit9037757c5fde77d74e24e100efd70420a51c5d95 (patch)
tree8e9f88df6e4f2beb8865f06d4deadb7d47d0f763
parent1a37aa7a88722f49928f6cd7851476aa4525462d (diff)
downloadbusybox-9037757c5fde77d74e24e100efd70420a51c5d95.tar.gz
dc: more docs in --help
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
-rw-r--r--miscutils/bc.c27
1 files changed, 14 insertions, 13 deletions
diff --git a/miscutils/bc.c b/miscutils/bc.c
index cc48ed3fe..934a1f8ba 100644
--- a/miscutils/bc.c
+++ b/miscutils/bc.c
@@ -143,12 +143,13 @@
//usage: "\n~ - divide with remainder"
//usage: "\n| - modular exponentiation"
//usage: "\nv - square root"
-//////// "\n_NNN - push neagtive number -NNN
-//////// "\n[string] - push string
+//////// "\nA-F - digits 10..15
+//////// "\n_NNN - push negative number -NNN
+//////// "\n[string] - push string (in FreeBSD, \[, \] and \\ are escapes, not implemented here and in GNU)
//////// "\nR - DC_LEX_POP pop and discard
//////// "\nc - DC_LEX_CLEAR_STACK clear stack
-//////// "\nd - DC_LEX_DUPLICATE pop, push, push
-//////// "\nr - DC_LEX_SWAP pop 1, pop 2, push 1, push 2
+//////// "\nd - DC_LEX_DUPLICATE duplicate top-of-stack
+//////// "\nr - DC_LEX_SWAP swap top-of-stack
//////// "\n:r - DC_LEX_COLON pop index, pop value, store to array 'r'
//////// "\n;r - DC_LEX_SCOLON pop index, fetch from array 'r', push
//////// "\nLr - DC_LEX_LOAD_PO, pop register 'r', push
@@ -157,21 +158,21 @@
//////// "\nsr - DC_LEX_OP_ASSIGN pop, assign to register 'r'
//////// "\n? - DC_LEX_READ read line and execute
//////// "\nx - DC_LEX_EXECUTE pop string and execute
-//////// "\n<r - XC_LEX_OP_REL_GT pop, pop, execute register 'r' if top-of-stack was greater
-//////// "\n>r - XC_LEX_OP_REL_LT pop, pop, execute register 'r' if top-of-stack was less
+//////// "\n<r - XC_LEX_OP_REL_GT pop, pop, execute register 'r' if top-of-stack was less
+//////// "\n>r - XC_LEX_OP_REL_LT pop, pop, execute register 'r' if top-of-stack was greater
//////// "\n=r - XC_LEX_OP_REL_EQ pop, pop, execute register 'r' if equal
-//////// "\n!<r !>r !=r - negated forms
-//////// "\ne - DC_LEX_ELSE >tef: "if greater execute 't' else execute 'f'"
+//////// "\n !<r !>r !=r - negated forms
+//////// "\n >tef - "if greater execute register 't' else execute 'f'"
//////// "\nQ - DC_LEX_NQUIT pop, "break N" from macro invocations
//////// "\nq - DC_LEX_QUIT "break 2" (if less than 2 levels of macros, exit dc)
//////// "\nX - DC_LEX_SCALE_FACTOR pop, push number of fractional digits
//////// "\nZ - DC_LEX_LENGTH pop, push number of digits it has (or number of characters in string)
//////// "\na - DC_LEX_ASCIIFY pop, push low-order byte as char or 1st char of string
-//////// "\n( - DC_LEX_LPAREN (not in GNU) pop, pop, if top-of-stack was less push 1 else push 0
-//////// "\n{ - DC_LEX_LBRACE (not in GNU) pop, pop, if top-of-stack was less-or-equal push 1 else push 0
-//////// "\nG - DC_LEX_EQ_NO_REG (not in GNU) pop, pop, if equal push 1 else push 0
-//////// "\nN - DC_LEX_OP_BOOL_NOT (not in GNU) pop, if 0 push 1 else push 0
-//////// "\n_ - XC_LEX_NEG (not a command - starts negative number)
+//////// "\n( - DC_LEX_LPAREN (FreeBSD, not in GNU) pop, pop, if top-of-stack was less push 1 else push 0
+//////// "\n{ - DC_LEX_LBRACE (FreeBSD, not in GNU) pop, pop, if top-of-stack was less-or-equal push 1 else push 0
+//////// "\nG - DC_LEX_EQ_NO_REG (FreeBSD, not in GNU) pop, pop, if equal push 1 else push 0
+//////// "\nN - DC_LEX_OP_BOOL_NOT (FreeBSD, not in GNU) pop, if 0 push 1 else push 0
+//////// FreeBSD also has J and M commands, used internally by bc
//////// "\nn - DC_LEX_PRINT_POP pop, print without newline
//////// "\nP - DC_LEX_PRINT_STREAM pop, print string or hex bytes
//usage: )