Multiple changes:

1)  Compile test with -O0, it takes too long otherwise.

2)  Add error codes: ZERROR_0_POW_0, ZERROR_0_DIV_0, ZERROR_DIV_0, ZERROR_NEGATIVE.

3)  Add workaround for a bug in clang (src/allocator.c).

4)  Cleanups.

5)  Minor optimisations.

6)  Add inclusion guard for zahl.h.

Signed-off-by: Mattias Andrée <maandree@kth.se>

1 files changed, 43 insertions, 0 deletions

diff --git a/man/zerror.3 b/man/zerror.3
index 837b3df..8bc0e53 100644
--- a/man/zerror.3
+++ b/man/zerror.3
@@ -37,5 +37,48 @@ The error is stored in
 (The error may not be stored in
 .I errno
 until this function is called.)
+.TP
+.B ZERROR_0_POW_0
+An attempt to calculate the zeroth power of zero was made.
+This is on indeterminate form and cannot be calculated.
+The closest matching
+.I errno
+value is
+.BR EDOM .
+.TP
+.B ZERROR_0_DIV_0
+An attempt to divide zero by zero was made.
+This is on indeterminate form and cannot be calculated.
+The closest matching
+.I errno
+value is
+.BR EDOM .
+.TP
+.B ZERROR_DIV_0
+An attempt to divide a non-zero value by zero was made.
+This is undefined and cannot be calculated.
+This occurs if a divisor or a modulator is zero, or if
+zero is raised to a negative number.
+The closest matching
+.I errno
+value is
+.BR EDOM .
+.TP
+.B ZERROR_NEGATIVE
+A function argument that must not be negative was negative.
+The closest matching
+.I errno
+values is
+.B EDOM
+and
+.BR EINVAL .
+.SH RETURN VALUE
+.B zerror
+returns the error that caused libzahl a function to fail.
+.SH NOTES
+.I errno
+is only set if
+.B ZERROR_ERRNO_SET
+is returned.
 .SH SEE ALSO
 .BR zperror (3)