Do not depend on GNU libc'isms for signed infinities #13
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The behaviour of isinf() that is mandated by the C99 spec is to return a non-zero value if the value is an infinity, regardless of sign. GNU libc returns -1 for negative infinities and 1 for positive ones, but other standard C libraries might be more strict.
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The behaviour of isinf() that is mandated by the C99 spec is to return a
non-zero value if the value is an infinity, regardless of sign. GNU libc
returns -1 for negative infinities and 1 for positive ones, but other
standard C libraries might be more strict.