#5151 closed enhancement (fixed)


Reported by: Bruce Dubbs Owned by: lfs-book
Priority: normal Milestone: 11.3
Component: Book Version: git
Severity: normal Keywords:


New minor version.

Change History (2)

comment:1 by Bruce Dubbs, 13 months ago

## 6.1.1

This is a production release that fixes a build issue with predefined builds and generated tests.

## 6.1.0

This is a production release that fixes a discrepancy from the bc standard, a couple of memory bugs, and adds new features.

The discrepancy from the bc standard was with regards to the behavior of the quit command. This bc used to quit whenever it encountered quit during parsing, even if it was parsing a full file. Now, bc only quits when encountering quit *after* it has executed all executable statements up to that point.

This behavior is slightly different from GNU bc, but users will only notice the difference if they put quit on the same line as other statements.

The first memory bug could be reproduced by assigning a string to a non-local variable in a function, then redefining the function with use of the same non-local variable, which would still refer to a string in the previous version of the function.

The second memory bug was caused by passing an array argument to the asciify() built-in function. In certain cases, that was wrongly allowed, and the interpreter just assumed everything was correct and accessed memory. Now that arrays are allowed as arguments (see below), this is not an issue.

The first feature was the addition of the is_number() built-in function (u in dc) that returns 1 if the runtime argument is a number and 0 otherwise.

The second feature was the addition of the is_string() built-in function (t in dc) that returns 1 if the runtime argument is a string and 0 otherwise.

These features were added because I realized that type-checking is necessary now that strings can be assigned to variables in bc and because they've always been assignable to variables in dc.

The last added feature is the ability of the asciify() built-in function in bc to convert a full array of numbers into a string. This means that character-by-character printing will not be necessary, and more strings than just single-character ones will be able to be created.

comment:2 by Xi Ruoyao, 13 months ago

Resolution: fixed
Status: newclosed
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