py/mpz.c: Fix bug with shl not truncating zero digits correctly.

dpgeorge · dpgeorge · commit f66ee4dfd706 · 2015-04-22T23:16:49.000+01:00
diff --git a/py/mpz.c b/py/mpz.c
@@ -97,7 +97,7 @@ STATIC mp_uint_t mpn_shl(mpz_dig_t *idig, mpz_dig_t *jdig, mp_uint_t jlen, mp_ui
 
     // work out length of result
     jlen += n_whole;
-    if (idig[jlen - 1] == 0) {
+    while (jlen != 0 && idig[jlen - 1] == 0) {
         jlen--;
     }
 

Original file line number	Diff line number	Diff line change
`@@ -97,7 +97,7 @@ STATIC mp_uint_t mpn_shl(mpz_dig_t idig, mpz_dig_t jdig, mp_uint_t jlen, mp_ui`
`97`	`97`
`98`	`98`	`// work out length of result`
`99`	`99`	`jlen += n_whole;`
`100`		`- if (idig[jlen - 1] == 0) {`
	`100`	`+ while (jlen != 0 && idig[jlen - 1] == 0) {`
`101`	`101`	`jlen--;`
`102`	`102`	`}`
`103`	`103`