1 files changed, 89 insertions, 0 deletions
diff --git a/src/inp_str.c b/src/inp_str.c
new file mode 100644
index 0000000..5679844
--- /dev/null
+++ b/src/inp_str.c
@@ -0,0 +1,89 @@
+/* mpfr_inp_str -- input a number in base BASE from stdio stream STREAM
+                   and store the result in ROP
+
+Copyright 1999, 2001, 2002, 2004, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Free Software Foundation, Inc.
+Contributed by the AriC and Caramel projects, INRIA.
+
+This file is part of the GNU MPFR Library.
+
+The GNU MPFR Library is free software; you can redistribute it and/or modify
+it under the terms of 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.
+
+The GNU MPFR 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 Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with the GNU MPFR Library; see the file COPYING.LESSER.  If not, see
+http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
+51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
+
+#include <ctype.h>
+
+#include "mpfr-impl.h"
+
+/* The original version of this function came from GMP's mpf/inp_str.c;
+   it has been adapted for MPFR. */
+
+size_t
+mpfr_inp_str (mpfr_ptr rop, FILE *stream, int base, mpfr_rnd_t rnd_mode)
+{
+  unsigned char *str;
+  size_t alloc_size, str_size;
+  int c;
+  int retval;
+  size_t nread;
+
+  if (stream == NULL)
+    stream = stdin;
+
+  alloc_size = 100;
+  str = (unsigned char *) (*__gmp_allocate_func) (alloc_size);
+  str_size = 0;
+  nread = 0;
+
+  /* Skip whitespace.  */
+  do
+    {
+      c = getc (stream);
+      nread++;
+    }
+  while (isspace (c));
+
+  /* number of characters read is nread */
+
+  for (;;)
+    {
+      if (str_size >= alloc_size)
+        {
+          size_t old_alloc_size = alloc_size;
+          alloc_size = alloc_size * 3 / 2;
+          str = (unsigned char *)
+            (*__gmp_reallocate_func) (str, old_alloc_size, alloc_size);
+        }
+      if (c == EOF || isspace (c))
+        break;
+      str[str_size++] = (unsigned char) c;
+      c = getc (stream);
+    }
+  ungetc (c, stream);
+
+  /* number of characters read is nread + str_size - 1 */
+
+  /* we can exit the for loop only by the break instruction,
+     then necessarily str_size >= alloc_size was checked, so
+     now str_size < alloc_size */
+
+  str[str_size] = '\0';
+
+  retval = mpfr_set_str (rop, (char *) str, base, rnd_mode);
+  (*__gmp_free_func) (str, alloc_size);
+
+  if (retval == -1)
+    return 0;                   /* error */
+
+ return str_size + nread - 1;
+}