nshlib: add expr command support
#2268
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It is a mini version for the `expr` command, which implements the features of addition, subtraction, multiplication, division and mod. Reference: https://www.geeksforgeeks.org/expr-command-in-linux-with-examples/ bl2> bl2> expr 1 + 2 3 bl2> expr Usage: expr <operand1> <operator> <operand2> bl2> expr 5 - 2 3 bl2> set hello 10 bl2> expr $hello - 2 8 bl2> expr 8 a 9 Unknown operator bl2> expr 20 / 5 4 bl2> expr 10 % 4 2 bl2> expr 10 / 0 operand2 invalid bl2> bl2> expr mi + 100 invalid parameter bl2> expr 100 + mi invalid parameter bl2> expr 100 + 0 100 Signed-off-by: Junbo Zheng <[email protected]>
xiaoxiang781216
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Jan 26, 2024
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Reference: apache/nuttx-apps#2268 Signed-off-by: Junbo Zheng <[email protected]>
freakishness
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Reference: apache/nuttx-apps#2268 Signed-off-by: Junbo Zheng <[email protected]>
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Reference: apache/nuttx-apps#2268 Signed-off-by: Junbo Zheng <[email protected]>
anchao
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Reference: apache/nuttx-apps#2268 Signed-off-by: Junbo Zheng <[email protected]>
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Summary
nshlib: add
exprcommand supportIt is a mini version for the
exprcommand, which implements the features of addition, subtraction, multiplication, division and mod.Reference: https://www.geeksforgeeks.org/expr-command-in-linux-with-examples/
Signed-off-by: Junbo Zheng [email protected]
Impact
Testing