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/inp_str.c b/third_party/gmp/mpz/inp_str.c
new file mode 100644
index 0000000..0756055
--- /dev/null
+++ b/third_party/gmp/mpz/inp_str.c
@@ -0,0 +1,173 @@
+/* mpz_inp_str(dest_integer, stream, base) -- Input a number in base
+ BASE from stdio stream STREAM and store the result in DEST_INTEGER.
+
+ OF THE FUNCTIONS IN THIS FILE, ONLY mpz_inp_str IS FOR EXTERNAL USE, THE
+ REST ARE INTERNALS AND ARE ALMOST CERTAIN TO BE SUBJECT TO INCOMPATIBLE
+ CHANGES OR DISAPPEAR COMPLETELY IN FUTURE GNU MP RELEASES.
+
+Copyright 1991, 1993, 1994, 1996, 1998, 2000-2003, 2011-2013 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 <stdio.h>
+#include <ctype.h>
+#include "gmp-impl.h"
+#include "longlong.h"
+
+#define digit_value_tab __gmp_digit_value_tab
+
+size_t
+mpz_inp_str (mpz_ptr x, FILE *stream, int base)
+{
+ int c;
+ size_t nread;
+
+ if (stream == 0)
+ stream = stdin;
+
+ nread = 0;
+
+ /* Skip whitespace. */
+ do
+ {
+ c = getc (stream);
+ nread++;
+ }
+ while (isspace (c));
+
+ return mpz_inp_str_nowhite (x, stream, base, c, nread);
+}
+
+/* shared by mpq_inp_str */
+size_t
+mpz_inp_str_nowhite (mpz_ptr x, FILE *stream, int base, int c, size_t nread)
+{
+ char *str;
+ size_t alloc_size, str_size;
+ int negative;
+ mp_size_t xsize;
+ const unsigned char *digit_value;
+
+ ASSERT_ALWAYS (EOF == -1); /* FIXME: handle this by adding explicit */
+ /* comparisons of c and EOF before each */
+ /* read of digit_value[]. */
+
+ digit_value = digit_value_tab;
+ if (base > 36)
+ {
+ /* For bases > 36, use the collating sequence
+ 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz. */
+ digit_value += 208;
+ if (UNLIKELY (base > 62))
+ return 0; /* too large base */
+ }
+
+ negative = 0;
+ if (c == '-')
+ {
+ negative = 1;
+ c = getc (stream);
+ nread++;
+ }
+
+ if (c == EOF || digit_value[c] >= (base == 0 ? 10 : base))
+ return 0; /* error if no digits */
+
+ /* If BASE is 0, try to find out the base by looking at the initial
+ characters. */
+ if (base == 0)
+ {
+ base = 10;
+ if (c == '0')
+ {
+ base = 8;
+ c = getc (stream);
+ nread++;
+ if (c == 'x' || c == 'X')
+ {
+ base = 16;
+ c = getc (stream);
+ nread++;
+ }
+ else if (c == 'b' || c == 'B')
+ {
+ base = 2;
+ c = getc (stream);
+ nread++;
+ }
+ }
+ }
+
+ /* Skip leading zeros. */
+ while (c == '0')
+ {
+ c = getc (stream);
+ nread++;
+ }
+
+ alloc_size = 100;
+ str = __GMP_ALLOCATE_FUNC_TYPE (alloc_size, char);
+ str_size = 0;
+
+ while (c != EOF)
+ {
+ int dig;
+ dig = digit_value[c];
+ if (dig >= base)
+ break;
+ if (str_size >= alloc_size)
+ {
+ size_t old_alloc_size = alloc_size;
+ alloc_size = alloc_size * 3 / 2;
+ str = __GMP_REALLOCATE_FUNC_TYPE (str, old_alloc_size, alloc_size, char);
+ }
+ str[str_size++] = dig;
+ c = getc (stream);
+ }
+ nread += str_size;
+
+ ungetc (c, stream);
+ nread--;
+
+ /* Make sure the string is not empty, mpn_set_str would fail. */
+ if (str_size == 0)
+ {
+ SIZ (x) = 0;
+ }
+ else
+ {
+ LIMBS_PER_DIGIT_IN_BASE (xsize, str_size, base);
+ MPZ_NEWALLOC (x, xsize);
+
+ /* Convert the byte array in base BASE to our bignum format. */
+ xsize = mpn_set_str (PTR (x), (unsigned char *) str, str_size, base);
+ SIZ (x) = negative ? -xsize : xsize;
+ }
+ (*__gmp_free_func) (str, alloc_size);
+ return nread;
+}