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71 lines
1.8 KiB
Plaintext
71 lines
1.8 KiB
Plaintext
NAME
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newerror - create or recall a described error-value
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SYNOPSIS
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newerror([str])
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TYPES
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str string
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return error-value
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DESCRIPTION
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If str is not "" and has not earlier been used as an argument for
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this function, newerror(str) creates a new described error-value so
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that any future use of newerror(str) with the same str will return
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the same error-value.
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If x = newerror(str), both strerror(x) and strerror(iserro(x)) will
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return str and iserror(x) will return the error code value of the
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new error.
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The null cases newerror() and newerror("") are equivalent to
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newerror("???").
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EXAMPLE
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Note that by default, errmax() is 0 so unless errmax() is
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increased you will get:
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> ba = newerror("curds n' whey");
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Error 20000 caused errcount to exceed errmax
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> errmax(errcount()+5)
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0
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> e1 = newerror("triangle side length <= 0")
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> iserror(e1)
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20000
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> error(20000)
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Error 20000
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> strerror(error(20000))
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"triangle side length <= 0"
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> strerror(e1);
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"triangle side length <= 0"
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> strerror(error(iserror(e1)))
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"triangle side length <= 0"
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> define area(a,b,c) {
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>> local s;
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>> if (!(a > 0) || !(b > 0) || !(c > 0)) return e1;
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>> s = (a + b + c)/2;
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>> if (s <= a || s <= b || s <= c) return newerror("Non-triangle sides");
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>> return sqrt(s * (s - a) * (s - b) * (s - c));
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>> }
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"area" defined
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> A = area(8,2,5);
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> if (iserror(A)) print strerror(A) : ":", iserror(A);
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Non-triangle sides: 20001
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> A = area(-3,4,5)
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> if (iserror(A)) print strerror(A) : ":", iserror(A);
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triangle side length <= 0: 20000
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LIMITS
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The number of new described error-values is not to exceed 12767.
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LIBRARY
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none
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SEE ALSO
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errmax, errcount, error, strerror, iserror, errno, errorcodes
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