diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/expressions.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/src/expressions.c b/src/expressions.c index 93e3fdc..cec3492 100644 --- a/src/expressions.c +++ b/src/expressions.c @@ -184,7 +184,28 @@ teco_expressions_calc(GError **error) switch (op) { case TECO_OP_POW: - for (result = 1; vright--; result *= vleft); + if (!vright) { + result = vleft < 0 ? -1 : 1; + break; + } + if (vright < 0) { + if (!vleft) { + g_set_error_literal(error, TECO_ERROR, TECO_ERROR_FAILED, + "Negative power of 0 is not defined"); + return FALSE; + } + result = ABS(vleft) == 1 ? vleft : 0; + break; + } + result = 1; + for (;;) { + if (vright & 1) + result *= vleft; + vright >>= 1; + if (!vright) + break; + vleft *= vleft; + } break; case TECO_OP_MUL: result = vleft * vright; |