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shell: improve reliability
Make ASCII_BS (sent when driven through kbd) make the same thing as ASCII_DEL. Also, don't crash on filling the buffer.
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@ -87,6 +87,8 @@ shellLoop:
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jr z, .do ; char is LF? do!
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jr z, .do ; char is LF? do!
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cp ASCII_DEL
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cp ASCII_DEL
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jr z, .delchr
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jr z, .delchr
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cp ASCII_BS
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jr z, .delchr
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; Echo the received character right away so that we see what we type
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; Echo the received character right away so that we see what we type
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call stdioPutC
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call stdioPutC
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@ -98,8 +100,9 @@ shellLoop:
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xor a ; look for null
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xor a ; look for null
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call findchar ; HL points to where we need to write
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call findchar ; HL points to where we need to write
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; A is the number of chars in the buf
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; A is the number of chars in the buf
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cp SHELL_BUFSIZE
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cp SHELL_BUFSIZE-1 ; -1 is because we always want to keep our
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jr z, .do ; A == bufsize? then our buffer is full. do!
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; last char at zero.
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jr z, .do ; end of buffer reached? buffer is full. do!
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; bring the char back in A
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; bring the char back in A
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ex af, af'
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ex af, af'
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@ -124,7 +127,6 @@ shellLoop:
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ld hl, .prompt
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ld hl, .prompt
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call printstr
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call printstr
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jr shellLoop
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jr shellLoop
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; no ret because we never return
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.prompt:
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.prompt:
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.db "> ", 0
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.db "> ", 0
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