add directory gnu

gnu/glibc/glibc-1.03/stdlib/strtol.c

@@ -0,0 +1,159 @@
+/* Copyright (C) 1991 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <ansidecl.h>
+#include <ctype.h>
+#include <limits.h>
+#include <stddef.h>
+#include <stdlib.h>
+
+
+#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
+DEFUN(strtol, (nptr, endptr, base),
+      CONST char *nptr AND char **endptr AND int base)
+{
+  char sign;
+  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 == '-')
+    {
+      sign = -1;
+      ++s;
+    }
+  else if (*s == '+')
+    {
+      sign = 1;
+      ++s;
+    }
+  else
+    sign = 1;
+
+  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 > (unsigned long int) (sign > 0 ? LONG_MAX : - LONG_MAX))
+    overflow = 1;
+#endif
+
+  if (overflow)
+    {
+      errno = ERANGE;
+#if	UNSIGNED
+      return ULONG_MAX;
+#else
+      return sign > 0 ? LONG_MAX : LONG_MIN;
+#endif
+    }
+
+  /* Return the result of the appropriate sign.  */
+  return i * sign;
+
+noconv:;
+  /* There was no number to convert.  */
+  if (endptr != NULL)
+    *endptr = (char *) nptr;
+  return 0L;
+}