Changes to m4/lib/strtol.c [branch-1_4]

[Gary V . Vaughan]

Index: m4/lib/strtol.c
diff -u /dev/null m4/lib/strtol.c:1.1.1.1.2.1
--- /dev/null   Sun May  1 11:54:15 2005
+++ m4/lib/strtol.c     Sun May  1 11:54:12 2005
@@ -0,0 +1,190 @@
+/* GNU m4 -- A simple macro processor
+
+   Copyright (C) 1991, 1992 Free Software Foundation, Inc.
+
+   This program 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 of the License, or
+   (at your option) any later version.
+
+   This program 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 this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+   02110-1301  USA
+*/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <ctype.h>
+#include <errno.h>
+
+#if HAVE_LIMITS_H
+#include <limits.h>
+#endif
+
+#ifndef ULONG_MAX
+#define ULONG_MAX ((unsigned long) ~(unsigned long) 0)
+#endif
+
+#ifndef LONG_MAX
+#define        LONG_MAX (~(1 << (sizeof (long) * 8 - 1)))
+#endif
+
+#ifndef LONG_MIN
+#define LONG_MIN (-LONG_MAX - 1)
+#endif
+
+#if STDC_HEADERS
+#include <stddef.h>
+#include <stdlib.h>
+#else
+#define NULL 0
+extern int errno;
+#endif
+
+#ifndef        UNSIGNED
+#define        UNSIGNED        0
+#endif
+
+/* Convert NPTR to an `unsigned long int' or `long int' in base BASE.
+   If BASE is 0 the base is determined by the presence of a leading
+   zero, indicating octal or a leading "0x" or "0X", indicating hexadecimal.
+   If BASE is < 2 or > 36, it is reset to 10.
+   If ENDPTR is not NULL, a pointer to the character after the last
+   one converted is stored in *ENDPTR.  */
+#if    UNSIGNED
+unsigned long int
+#define        strtol  strtoul
+#else
+long int
+#endif
+strtol (nptr, endptr, base)
+     const char *nptr;
+     char **endptr;
+     int base;
+{
+  int negative;
+  register unsigned long int cutoff;
+  register unsigned int cutlim;
+  register unsigned long int i;
+  register const char *s;
+  register unsigned char c;
+  const char *save;
+  int overflow;
+
+  if (base < 0 || base == 1 || base > 36)
+    base = 10;
+
+  s = nptr;
+
+  /* Skip white space.  */
+  while (isspace (*s))
+    ++s;
+  if (*s == '\0')
+    goto noconv;
+
+  /* Check for a sign.  */
+  if (*s == '-')
+    {
+      negative = 1;
+      ++s;
+    }
+  else if (*s == '+')
+    {
+      negative = 0;
+      ++s;
+    }
+  else
+    negative = 0;
+
+  if (base == 16 && s[0] == '0' && toupper (s[1]) == 'X')
+    s += 2;
+
+  /* If BASE is zero, figure it out ourselves.  */
+  if (base == 0)
+    {
+      if (*s == '0')
+       {
+         if (toupper (s[1]) == 'X')
+           {
+             s += 2;
+             base = 16;
+           }
+         else
+           base = 8;
+       }
+      else
+       base = 10;
+    }
+
+  /* Save the pointer so we can check later if anything happened.  */
+  save = s;
+
+  cutoff = ULONG_MAX / (unsigned long int) base;
+  cutlim = ULONG_MAX % (unsigned long int) base;
+
+  overflow = 0;
+  i = 0;
+  for (c = *s; c != '\0'; c = *++s)
+    {
+      if (isdigit (c))
+       c -= '0';
+      else if (isalpha (c))
+       c = toupper (c) - 'A' + 10;
+      else
+       break;
+      if (c >= base)
+       break;
+      /* Check for overflow.  */
+      if (i > cutoff || (i == cutoff && c > cutlim))
+       overflow = 1;
+      else
+       {
+         i *= (unsigned long int) base;
+         i += c;
+       }
+    }
+
+  /* Check if anything actually happened.  */
+  if (s == save)
+    goto noconv;
+
+  /* Store in ENDPTR the address of one character
+     past the last character we converted.  */
+  if (endptr != NULL)
+    *endptr = (char *) s;
+
+#if    !UNSIGNED
+  /* Check for a value that is within the range of
+     `unsigned long int', but outside the range of `long int'.  */
+  if (i > (negative ?
+          -(unsigned long int) LONG_MIN : (unsigned long int) LONG_MAX))
+    overflow = 1;
+#endif
+
+  if (overflow)
+    {
+      errno = ERANGE;
+#if    UNSIGNED
+      return ULONG_MAX;
+#else
+      return negative ? LONG_MIN : LONG_MAX;
+#endif
+    }
+
+  /* Return the result of the appropriate sign.  */
+  return (negative ? -i : i);
+
+noconv:;
+  /* There was no number to convert.  */
+  if (endptr != NULL)
+    *endptr = (char *) nptr;
+  return 0L;
+}