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	zerror.c - libzahl - big integer library
	git clone git://git.suckless.org/libzahl
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	---
	zerror.c (667B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include "internals.h"
	3
	4
	5 #define LIST_ERRORS\
	6 X(ZERROR_0_POW_0, "indeterminate form: 0:th power of 0")\
	7 X(ZERROR_0_DIV_0, "indeterminate form: 0 divided by 0")\
	8 X(ZERROR_DIV_0, "undefined result: division by 0")\
	9 X(ZERROR_NEGATIVE, "argument must be non-negative")
	10
	11
	12 enum zerror
	13 zerror(const char **desc)
	14 {
	15 if (libzahl_error >= 0) {
	16 if (desc)
	17 *desc = strerror(libzahl_error);
	18 errno = libzahl_error;
	19 return ZERROR_ERRNO_SET;
	20 }
	21
	22 if (desc) {
	23 switch (-libzahl_error) {
	24 #define X(V, D) case V: *desc = D; break;
	25 LIST_ERRORS
	26 #undef X
	27 default:
	28 abort();
	29 }
	30 }
	31 return -libzahl_error;
	32 }