include/pub_tool_libcbase.h

/*--------------------------------------------------------------------*/
/*--- Standalone libc stuff.                   pub_tool_libcbase.h ---*/
/*--------------------------------------------------------------------*/

/*
   This file is part of Valgrind, a dynamic binary instrumentation
   framework.

   Copyright (C) 2000-2009 Julian Seward
      jseward@acm.org

   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., 59 Temple Place, Suite 330, Boston, MA
   02111-1307, USA.

   The GNU General Public License is contained in the file COPYING.
*/

#ifndef __PUB_TOOL_LIBCBASE_H
#define __PUB_TOOL_LIBCBASE_H

/* ---------------------------------------------------------------------
   Char functions.
   ------------------------------------------------------------------ */

extern Bool VG_(isspace) ( Char c );
extern Bool VG_(isdigit) ( Char c );
extern Char VG_(tolower) ( Char c );

/* ---------------------------------------------------------------------
   Converting strings to numbers
   ------------------------------------------------------------------ */

// Convert strings to numbers according to various bases.  Leading
// whitespace is ignored.  A subsequent '-' or '+' is accepted.  For strtoll16,
// accepts an initial "0x" or "0X" prefix, but only if it's followed by a
// hex digit (if not, the '0' will be read and then it will stop on the
// "x"/"X".)  If 'endptr' isn't NULL, it gets filled in with the first
// non-digit char.  Returns 0 if no number could be converted, and 'endptr'
// is set to the start of the string.  None of them test that the number
// fits into 64 bits.
//
// Nb: if you're wondering why we don't just have a single VG_(strtoll) which
// takes a base, it's because I wanted it to assert if it was given a bogus
// base (the standard glibc one sets 'errno' in this case).  But
// m_libcbase.c doesn't import any code, not even vg_assert. --njn
// 
// Nb: we also don't provide VG_(atoll*);  these functions are worse than
// useless because they don't do any error checking and so accept malformed
// numbers and non-numbers -- eg. "123xyz" gives 123, and "foo" gives 0!
// If you really want that behaviour, you can use "VG_(strtoll10)(str, NULL)".
extern Long  VG_(strtoll10) ( Char* str, Char** endptr );
extern Long  VG_(strtoll16) ( Char* str, Char** endptr );

// Convert a string to a double.  After leading whitespace is ignored, a
// '+' or '-' is allowed, and then it accepts a non-empty sequence of
// decimal digits possibly containing a '.'.  Hexadecimal floats are not
// accepted, nor are "fancy" floats (eg. "3.4e-5", "NAN").
extern double VG_(strtod)  ( Char* str, Char** endptr );

/* ---------------------------------------------------------------------
   String functions and macros
   ------------------------------------------------------------------ */

/* Use this for normal null-termination-style string comparison. */
#define VG_STREQ(s1,s2) ( (s1 != NULL && s2 != NULL \
                           && VG_(strcmp)((s1),(s2))==0) ? True : False )
#define VG_STREQN(n,s1,s2) ( (s1 != NULL && s2 != NULL \
                             && VG_(strncmp)((s1),(s2),(n))==0) ? True : False )

extern SizeT VG_(strlen)         ( const Char* str );
extern Char* VG_(strcat)         ( Char* dest, const Char* src );
extern Char* VG_(strncat)        ( Char* dest, const Char* src, SizeT n );
extern Char* VG_(strpbrk)        ( const Char* s, const Char* accpt );
extern Char* VG_(strcpy)         ( Char* dest, const Char* src );
extern Char* VG_(strncpy)        ( Char* dest, const Char* src, SizeT ndest );
extern Int   VG_(strcmp)         ( const Char* s1, const Char* s2 );
extern Int   VG_(strcasecmp)     ( const Char* s1, const Char* s2 );
extern Int   VG_(strncmp)        ( const Char* s1, const Char* s2, SizeT nmax );
extern Int   VG_(strncasecmp)    ( const Char* s1, const Char* s2, SizeT nmax );
extern Char* VG_(strstr)         ( const Char* haystack, Char* needle );
extern Char* VG_(strcasestr)     ( const Char* haystack, Char* needle );
extern Char* VG_(strchr)         ( const Char* s, Char c );
extern Char* VG_(strrchr)        ( const Char* s, Char c );
extern SizeT VG_(strspn)         ( const Char* s, const Char* accpt );
extern SizeT VG_(strcspn)        ( const Char* s, const char* reject );

/* Like strncpy(), but if 'src' is longer than 'ndest' inserts a '\0' as the
   last character. */
extern void  VG_(strncpy_safely) ( Char* dest, const Char* src, SizeT ndest );

/* ---------------------------------------------------------------------
   mem* functions
   ------------------------------------------------------------------ */

extern void* VG_(memcpy) ( void *d, const void *s, SizeT sz );
extern void* VG_(memmove)( void *d, const void *s, SizeT sz );
extern void* VG_(memset) ( void *s, Int c, SizeT sz );
extern Int   VG_(memcmp) ( const void* s1, const void* s2, SizeT n );

/* Zero out up to 8 words quickly in-line.  Do not use this for blocks
   of size which are unknown at compile time, since the whole point is
   for it to be inlined, and then for gcc to remove all code except
   for the relevant 'sz' case. */
inline __attribute__((always_inline))
static void VG_(bzero_inline) ( void* s, SizeT sz )
{
   if (LIKELY(0 == (((Addr)sz) & (Addr)(sizeof(UWord)-1)))
       && LIKELY(0 == (((Addr)s) & (Addr)(sizeof(UWord)-1)))) {
      UWord* p = (UWord*)s;
      switch (sz / (SizeT)sizeof(UWord)) {
          case 8: p[0] = p[1] = p[2] = p[3]
                  = p[4] = p[5] = p[6] = p[7] = 0UL; return;
          case 7: p[0] = p[1] = p[2] = p[3]
                  = p[4] = p[5] = p[6] = 0UL; return;
          case 6: p[0] = p[1] = p[2] = p[3]
                  = p[4] = p[5] = 0UL; return;
          case 5: p[0] = p[1] = p[2] = p[3] = p[4] = 0UL; return;
          case 4: p[0] = p[1] = p[2] = p[3] = 0UL; return;
          case 3: p[0] = p[1] = p[2] = 0UL; return;
          case 2: p[0] = p[1] = 0UL; return;
          case 1: p[0] = 0UL; return;
          case 0: return;
          default: break;
      }
   }
   VG_(memset)(s, 0, sz);
}


/* ---------------------------------------------------------------------
   Address computation helpers
   ------------------------------------------------------------------ */

// Check if an address/whatever is aligned
#define VG_IS_2_ALIGNED(aaa_p)    (0 == (((Addr)(aaa_p)) & ((Addr)0x1)))
#define VG_IS_4_ALIGNED(aaa_p)    (0 == (((Addr)(aaa_p)) & ((Addr)0x3)))
#define VG_IS_8_ALIGNED(aaa_p)    (0 == (((Addr)(aaa_p)) & ((Addr)0x7)))
#define VG_IS_16_ALIGNED(aaa_p)   (0 == (((Addr)(aaa_p)) & ((Addr)0xf)))
#define VG_IS_32_ALIGNED(aaa_p)   (0 == (((Addr)(aaa_p)) & ((Addr)0x1f)))
#define VG_IS_WORD_ALIGNED(aaa_p) (0 == (((Addr)(aaa_p)) & ((Addr)(sizeof(Addr)-1))))
#define VG_IS_PAGE_ALIGNED(aaa_p) (0 == (((Addr)(aaa_p)) & ((Addr)(VKI_PAGE_SIZE-1))))

// 'a' -- the alignment -- must be a power of 2.
// The latter two require the vki-*.h header to be imported also.
#define VG_ROUNDDN(p, a)   ((Addr)(p) & ~((Addr)(a)-1))
#define VG_ROUNDUP(p, a)   VG_ROUNDDN((p)+(a)-1, (a))
#define VG_PGROUNDDN(p)    VG_ROUNDDN(p, VKI_PAGE_SIZE)
#define VG_PGROUNDUP(p)    VG_ROUNDUP(p, VKI_PAGE_SIZE)

/* ---------------------------------------------------------------------
   Misc useful functions
   ------------------------------------------------------------------ */

/* Like qsort().  The name VG_(ssort) is for historical reasons -- it used
 * to be a shell sort, but is now a quicksort. */
extern void VG_(ssort)( void* base, SizeT nmemb, SizeT size,
                        Int (*compar)(void*, void*) );

/* Returns the base-2 logarithm of x.  Returns -1 if x is not a power
   of two.  Nb: VG_(log2)(1) == 0.  */
extern Int VG_(log2) ( UInt x );

// A pseudo-random number generator returning a random UInt.  If pSeed
// is NULL, it uses its own seed, which starts at zero.  If pSeed is
// non-NULL, it uses and updates whatever pSeed points at.
extern UInt VG_(random) ( /*MOD*/UInt* pSeed );
#define VG_RAND_MAX (1ULL << 32)

#endif   // __PUB_TOOL_LIBCBASE_H

/*--------------------------------------------------------------------*/
/*--- end                                                          ---*/
/*--------------------------------------------------------------------*/