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e7f2691599
Fixed several memory leaks. Prefix command without any parameter (to list the prefixes) would cause memory corruption when prefix had been invoked previously with a parameter. Sourcing a command file from within an exec file could cause gsh to wait forever, depending upon the commands executed in the sourced file. All built-in commands return appropriate status: 1 for error, 0 for no error. Fixed several cases where incorrect value was set in $status. Added usage strings for tset, hash, commands, and history. Fixed memory corruption error when edit command had no parameters. When system() is called with pointer = NULL or with a command string that causes gsh to detect an error (e.g., incompatibility with | and <), return status of -1. In other cases, return process's status rather than always 0. System would crash when output from a non-forked command was piped to another process; for example clear | cat > /tmp/list
129 lines
2.6 KiB
NASM
129 lines
2.6 KiB
NASM
**************************************************************************
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*
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* The GNO Shell Project
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*
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* Developed by:
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* Jawaid Bazyar
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* Tim Meekins
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*
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* $Id: bufpool.asm,v 1.6 1998/12/21 23:57:04 tribby Exp $
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*
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**************************************************************************
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*
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* BUFPOOL
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* By Tim Meekins
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* Modified by Dave Tribby for GNO 2.0.6 (256-byte buffer code removed)
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*
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* This is the buffer pool
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*
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* Note: text set up for tabs at col 16, 22, 41, 49, 57, 65
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* | | | | | |
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* ^ ^ ^ ^ ^ ^
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**************************************************************************
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*
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* Interfaces defined in this file:
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* The alloc routine is a jsl without any stack params.
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* Pointer to requested buffer is returned in X/A registers.
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* alloc1024
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* The free routine takes the address from the X/A registers
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* free1024
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*
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* bufpool data:
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* pool1024 dc i4'0'
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* pool1024mutex key
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*
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**************************************************************************
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mcopy /obj/gno/bin/gsh/bufpool.mac
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dummybufpool start ; ends up in .root
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end
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**************************************************************************
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*
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* Get a buffer of size 1024
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*
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**************************************************************************
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alloc1024 START
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using bufpool
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lock pool1024mutex
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lda pool1024 If pool pointer
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ora pool1024+2 isn't NULL,
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beq allocbuf
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phd
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ph4 pool1024 Push pool pointer on stack.
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tsc
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tcd
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lda [1] Replace pool pointer with
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sta pool1024 the address it points to.
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ldy #2
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lda [1],y
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sta pool1024+2
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unlock pool1024mutex
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pla
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plx
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pld
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rtl Return to caller.
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;
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; No memory in free pool; must allocate a new block.
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;
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allocbuf unlock pool1024mutex
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ph4 #1024
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~NEW
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rtl
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END
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**************************************************************************
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*
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* Free a buffer of size 1024, putting it into the free pool
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*
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**************************************************************************
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free1024 START
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using bufpool
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phd
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phx
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pha
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tsc
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tcd
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lock pool1024mutex
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lda pool1024 Move current head of pool list
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sta [1] into the buffer being freed.
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ldy #2
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lda pool1024+2
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sta [1],y
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lda 1 Put address of buffer being freed
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sta pool1024 into the pool list head.
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lda 3
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sta pool1024+2
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unlock pool1024mutex
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pla
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plx
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pld
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rtl Return to caller.
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END
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**************************************************************************
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*
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* Buffer pool data
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*
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**************************************************************************
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bufpool DATA
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pool1024 dc i4'0' Head of free pool list.
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pool1024mutex key Mutual exclusion when modifying list.
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END
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