1 files changed, 214 insertions, 0 deletions
diff --git a/libgfortran/runtime/string.c b/libgfortran/runtime/string.c
new file mode 100644
index 0000000000..332b42e682
--- /dev/null
+++ b/libgfortran/runtime/string.c
@@ -0,0 +1,214 @@
+/* Copyright (C) 2002-2017 Free Software Foundation, Inc.
+   Contributed by Paul Brook
+
+This file is part of the GNU Fortran runtime library (libgfortran).
+
+Libgfortran 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 3, or (at your option)
+any later version.
+
+Libgfortran 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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#include "libgfortran.h"
+#include <string.h>
+#include <strings.h>
+
+
+/* Given a fortran string, return its length exclusive of the trailing
+   spaces.  */
+
+gfc_charlen_type
+fstrlen (const char *string, gfc_charlen_type len)
+{
+  for (; len > 0; len--)
+    if (string[len-1] != ' ')
+      break;
+
+  return len;
+}
+
+
+/* Copy a Fortran string (not null-terminated, hence length arguments
+   for both source and destination strings. Returns the non-padded
+   length of the destination.  */
+
+gfc_charlen_type
+fstrcpy (char *dest, gfc_charlen_type destlen, 
+	 const char *src, gfc_charlen_type srclen)
+{
+  if (srclen >= destlen)
+    {
+      /* This will truncate if too long.  */
+      memcpy (dest, src, destlen);
+      return destlen;
+    }
+  else
+    {
+      memcpy (dest, src, srclen);
+      /* Pad with spaces.  */
+      memset (&dest[srclen], ' ', destlen - srclen);
+      return srclen;
+    }
+}
+
+
+/* Copy a null-terminated C string to a non-null-terminated Fortran
+   string. Returns the non-padded length of the destination string.  */
+
+gfc_charlen_type
+cf_strcpy (char *dest, gfc_charlen_type dest_len, const char *src)
+{
+  size_t src_len;
+
+  src_len = strlen (src);
+
+  if (src_len >= (size_t) dest_len)
+    {
+      /* This will truncate if too long.  */
+      memcpy (dest, src, dest_len);
+      return dest_len;
+    }
+  else
+    {
+      memcpy (dest, src, src_len);
+      /* Pad with spaces.  */
+      memset (&dest[src_len], ' ', dest_len - src_len);
+      return src_len;
+    }
+}
+
+
+#ifndef HAVE_STRNLEN
+static size_t
+strnlen (const char *s, size_t maxlen)
+{
+  for (size_t ii = 0; ii < maxlen; ii++)
+    {
+      if (s[ii] == '\0')
+	return ii;
+    }
+  return maxlen;
+}
+#endif
+
+
+#ifndef HAVE_STRNDUP
+static char *
+strndup (const char *s, size_t n)
+{
+  size_t len = strnlen (s, n);
+  char *p = malloc (len + 1);
+  if (!p)
+    return NULL;
+  memcpy (p, s, len);
+  p[len] = '\0';
+  return p;
+}
+#endif
+
+
+/* Duplicate a non-null-terminated Fortran string to a malloced
+   null-terminated C string.  */
+
+char *
+fc_strdup (const char *src, gfc_charlen_type src_len)
+{
+  gfc_charlen_type n = fstrlen (src, src_len);
+  char *p = strndup (src, n);
+  if (!p)
+    os_error ("Memory allocation failed in fc_strdup");
+  return p;
+}
+
+
+/* Duplicate a non-null-terminated Fortran string to a malloced
+   null-terminated C string, without getting rid of trailing
+   blanks.  */
+
+char *
+fc_strdup_notrim (const char *src, gfc_charlen_type src_len)
+{
+  char *p = strndup (src, src_len);
+  if (!p)
+    os_error ("Memory allocation failed in fc_strdup");
+  return p;
+}
+
+
+/* Given a fortran string and an array of st_option structures, search through
+   the array to find a match.  If the option is not found, we generate an error
+   if no default is provided.  */
+
+int
+find_option (st_parameter_common *cmp, const char *s1, gfc_charlen_type s1_len,
+	     const st_option * opts, const char *error_message)
+{
+  /* Strip trailing blanks from the Fortran string.  */
+  size_t len = (size_t) fstrlen (s1, s1_len);
+
+  for (; opts->name; opts++)
+    if (len == strlen(opts->name) && strncasecmp (s1, opts->name, len) == 0)
+      return opts->value;
+
+  generate_error (cmp, LIBERROR_BAD_OPTION, error_message);
+
+  return -1;
+}
+
+
+/* gfc_itoa()-- Integer to decimal conversion.
+   The itoa function is a widespread non-standard extension to
+   standard C, often declared in <stdlib.h>.  Even though the itoa
+   defined here is a static function we take care not to conflict with
+   any prior non-static declaration.  Hence the 'gfc_' prefix, which
+   is normally reserved for functions with external linkage.  Notably,
+   in contrast to the *printf() family of functions, this ought to be
+   async-signal-safe.  */
+
+const char *
+gfc_itoa (GFC_INTEGER_LARGEST n, char *buffer, size_t len)
+{
+  int negative;
+  char *p;
+  GFC_UINTEGER_LARGEST t;
+
+  if (len < GFC_ITOA_BUF_SIZE)
+    sys_abort ();
+
+  if (n == 0)
+    return "0";
+
+  negative = 0;
+  t = n;
+  if (n < 0)
+    {
+      negative = 1;
+      t = -n; /*must use unsigned to protect from overflow*/
+    }
+
+  p = buffer + GFC_ITOA_BUF_SIZE - 1;
+  *p = '\0';
+
+  while (t != 0)
+    {
+      *--p = '0' + (t % 10);
+      t /= 10;
+    }
+
+  if (negative)
+    *--p = '-';
+  return p;
+}