Add libgmp 6.2.0 to third_party
Don't build it yet. That will come in the next review.
Change-Id: Idf3266558165e5ab45f4a41c98cc8c838c8244d5
diff --git a/third_party/gmp/mpz/get_str.c b/third_party/gmp/mpz/get_str.c
new file mode 100644
index 0000000..c00a9a3
--- /dev/null
+++ b/third_party/gmp/mpz/get_str.c
@@ -0,0 +1,115 @@
+/* mpz_get_str (string, base, mp_src) -- Convert the multiple precision
+ number MP_SRC to a string STRING of base BASE. If STRING is NULL
+ allocate space for the result. In any case, return a pointer to the
+ result. If STRING is not NULL, the caller must ensure enough space is
+ available to store the result.
+
+Copyright 1991, 1993, 1994, 1996, 2000-2002, 2005, 2012, 2017 Free
+Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP Library is free software; you can redistribute it and/or modify
+it under the terms of either:
+
+ * the GNU Lesser General Public License as published by the Free
+ Software Foundation; either version 3 of the License, or (at your
+ option) any later version.
+
+or
+
+ * the GNU General Public License as published by the Free Software
+ Foundation; either version 2 of the License, or (at your option) any
+ later version.
+
+or both in parallel, as here.
+
+The GNU MP Library is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+for more details.
+
+You should have received copies of the GNU General Public License and the
+GNU Lesser General Public License along with the GNU MP Library. If not,
+see https://www.gnu.org/licenses/. */
+
+#include <string.h> /* for strlen */
+#include "gmp-impl.h"
+#include "longlong.h"
+
+char *
+mpz_get_str (char *res_str, int base, mpz_srcptr x)
+{
+ mp_ptr xp;
+ mp_size_t x_size = SIZ (x);
+ char *return_str;
+ size_t str_size;
+ size_t alloc_size = 0;
+ const char *num_to_text;
+ int i;
+ TMP_DECL;
+
+ num_to_text = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+ if (base > 1)
+ {
+ if (base <= 36)
+ num_to_text = "0123456789abcdefghijklmnopqrstuvwxyz";
+ else if (UNLIKELY (base > 62))
+ return NULL;
+ }
+ else if (base > -2)
+ {
+ base = 10;
+ }
+ else
+ {
+ base = -base;
+ if (UNLIKELY (base > 36))
+ return NULL;
+ }
+
+ /* allocate string for the user if necessary */
+ if (res_str == NULL)
+ {
+ /* digits, null terminator, possible minus sign */
+ MPN_SIZEINBASE (alloc_size, PTR(x), ABS(x_size), base);
+ alloc_size += 1 + (x_size<0);
+ res_str = __GMP_ALLOCATE_FUNC_TYPE (alloc_size, char);
+ }
+ return_str = res_str;
+
+ if (x_size < 0)
+ {
+ *res_str++ = '-';
+ x_size = -x_size;
+ }
+
+ /* mpn_get_str clobbers its input on non power-of-2 bases */
+ TMP_MARK;
+ xp = PTR (x);
+ if (! POW2_P (base))
+ {
+ xp = TMP_ALLOC_LIMBS (x_size | 1); /* |1 in case x_size==0 */
+ MPN_COPY (xp, PTR (x), x_size);
+ }
+
+ str_size = mpn_get_str ((unsigned char *) res_str, base, xp, x_size);
+ ASSERT (alloc_size == 0 || str_size <= alloc_size - (SIZ(x) < 0));
+
+ /* Convert result to printable chars. */
+ for (i = 0; i < str_size; i++)
+ res_str[i] = num_to_text[(int) res_str[i]];
+ res_str[str_size] = 0;
+
+ TMP_FREE;
+
+ /* if allocated then resize down to the actual space required */
+ if (alloc_size != 0)
+ {
+ size_t actual_size = str_size + 1 + (res_str - return_str);
+ ASSERT (actual_size == strlen (return_str) + 1);
+ __GMP_REALLOCATE_FUNC_MAYBE_TYPE (return_str, alloc_size, actual_size,
+ char);
+ }
+ return return_str;
+}