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dc: more docs in --help

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2021-02-26 17:11:55 +01:00
parent 1a37aa7a88
commit 9037757c5f
1 changed files with 14 additions and 13 deletions
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25
miscutils/bc.c
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@ -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 >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: )