[project @ 1996-01-08 20:28:12 by partain]

[ghc-hetmet.git] / ghc / runtime / gmp / mpz_inp_str.c

diff --git a/ghc/runtime/gmp/mpz_inp_str.c b/ghc/runtime/gmp/mpz_inp_str.c
new file mode 100644 (file)
index 0000000..a775996
--- /dev/null
+++ b/ghc/runtime/gmp/mpz_inp_str.c
@@ -0,0 +1,105 @@
+/* mpz_inp_str(dest_integer, stream, base) -- Input a number in base
+   BASE from stdio stream STREAM and store the result in DEST_INTEGER.
+
+Copyright (C) 1991, 1993 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 the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+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 a copy of the GNU General Public License
+along with the GNU MP Library; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#include <stdio.h>
+#include <ctype.h>
+#include "gmp.h"
+#include "gmp-impl.h"
+
+static int
+char_ok_for_base (c, base)
+     int c;
+     int base;
+{
+  if (isdigit (c))
+    return (unsigned) c - '0' < base;
+  if (islower (c))
+    return (unsigned) c - 'a' + 10 < base;
+  if (isupper (c))
+    return (unsigned) c - 'A' + 10 < base;
+
+  return 0;
+}
+
+void
+#ifdef __STDC__
+mpz_inp_str (MP_INT *dest, FILE *stream, int base)
+#else
+mpz_inp_str (dest, stream, base)
+     MP_INT *dest;
+     FILE *stream;
+     int base;
+#endif
+{
+  char *str;
+  size_t str_size;
+  size_t i;
+  int c;
+  int negative = 0;
+
+  str_size = 100;
+  str = (char *) (*_mp_allocate_func) (str_size);
+
+  c = getc (stream);
+  if (c == '-')
+    {
+      negative = 1;
+      c = getc (stream);
+    }
+
+  /* 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);
+         if (c == 'x' || c == 'X')
+           {
+             base = 16;
+             c = getc (stream);
+           }
+       }
+    }
+
+  for (i = 0; char_ok_for_base (c, base); i++)
+    {
+      if (i >= str_size)
+       {
+         size_t old_str_size = str_size;
+         str_size = str_size * 3 / 2;
+         str = (char *) (*_mp_reallocate_func) (str, old_str_size, str_size);
+       }
+      str[i] = c;
+      c = getc (stream);
+    }
+
+  ungetc (c, stream);
+
+  str[i] = 0;
+  _mpz_set_str (dest, str, base);
+  if (negative)
+    dest->size = -dest->size;
+
+  (*_mp_free_func) (str, str_size);
+}