coregrind/m_libcprint.c

/*--------------------------------------------------------------------*/
/*--- Libc printing.                                 m_libcprint.c ---*/
/*--------------------------------------------------------------------*/
 
/*
   This file is part of Valgrind, a dynamic binary instrumentation
   framework.

   Copyright (C) 2000-2008 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.
*/

#include "pub_core_basics.h"
#include "pub_core_vki.h"
#include "pub_core_debuglog.h"
#include "pub_core_libcbase.h"
#include "pub_core_libcassert.h"
#include "pub_core_libcfile.h"   // VG_(write)(), VG_(write_socket)()
#include "pub_core_libcprint.h"
#include "pub_core_libcproc.h"   // VG_(getpid)(), VG_(read_millisecond_timer()
#include "pub_core_options.h"
#include "valgrind.h"            // For RUNNING_ON_VALGRIND



/* ---------------------------------------------------------------------
   Writing to file or a socket
   ------------------------------------------------------------------ */

/* Tell the logging mechanism whether we are logging to a file
   descriptor or a socket descriptor. */
Bool VG_(logging_to_socket) = False;

/* Do the low-level send of a message to the logging sink. */
static void send_bytes_to_logging_sink ( Char* msg, Int nbytes )
{
   if (!VG_(logging_to_socket)) {
      /* VG_(clo_log_fd) could have been set to -1 in the various
         sys-wrappers for sys_fork, if --child-silent-after-fork=yes
         is in effect.  That is a signal that we should not produce
         any more output. */
      if (VG_(clo_log_fd) >= 0)
         VG_(write)( VG_(clo_log_fd), msg, nbytes );
   } else {
      Int rc = VG_(write_socket)( VG_(clo_log_fd), msg, nbytes );
      if (rc == -1) {
         // For example, the listener process died.  Switch back to stderr.
         VG_(logging_to_socket) = False;
         VG_(clo_log_fd) = 2;
         VG_(write)( VG_(clo_log_fd), msg, nbytes );
      }
   }
}

/* ---------------------------------------------------------------------
   printf() and friends
   ------------------------------------------------------------------ */

typedef 
   struct {
      HChar buf[100];
      Int   n;
   } 
   printf_buf;

// Adds a single char to the buffer.  When the buffer gets sufficiently
// full, we write its contents to the logging sink.
static void add_to_myprintf_buf ( HChar c, void *p )
{
   printf_buf *myprintf_buf = (printf_buf *)p;
   
   if (myprintf_buf->n >= 100-10 /*paranoia*/ ) {
      send_bytes_to_logging_sink( myprintf_buf->buf, myprintf_buf->n );
      myprintf_buf->n = 0;
   }
   myprintf_buf->buf[myprintf_buf->n++] = c;
   myprintf_buf->buf[myprintf_buf->n]   = 0;
}

UInt VG_(vprintf) ( const HChar *format, va_list vargs )
{
   UInt ret = 0;
   printf_buf myprintf_buf = {"",0};

   if (VG_(clo_log_fd) >= 0) {
      ret = VG_(debugLog_vprintf) 
               ( add_to_myprintf_buf, &myprintf_buf, format, vargs );

      // Write out any chars left in the buffer.
      if (myprintf_buf.n > 0) {
         send_bytes_to_logging_sink( myprintf_buf.buf, myprintf_buf.n );
      }
   }
   return ret;
}

UInt VG_(printf) ( const HChar *format, ... )
{
   UInt ret;
   va_list vargs;

   va_start(vargs, format);
   ret = VG_(vprintf)(format, vargs);
   va_end(vargs);

   return ret;
}

/* A general replacement for sprintf(). */
static void add_to_vg_sprintf_buf ( HChar c, void *p )
{
   char **vg_sprintf_ptr = p;
   *(*vg_sprintf_ptr)++ = c;
}

UInt VG_(vsprintf) ( Char* buf, const HChar *format, va_list vargs )
{
   Int ret;
   Char *vg_sprintf_ptr = buf;

   ret = VG_(debugLog_vprintf) 
            ( add_to_vg_sprintf_buf, &vg_sprintf_ptr, format, vargs );
   add_to_vg_sprintf_buf('\0', &vg_sprintf_ptr);

   vg_assert(VG_(strlen)(buf) == ret);

   return ret;
}

UInt VG_(sprintf) ( Char* buf, const HChar *format, ... )
{
   UInt ret;
   va_list vargs;

   va_start(vargs,format);
   ret = VG_(vsprintf)(buf, format, vargs);
   va_end(vargs);

   return ret;
}


/* A replacement for snprintf. */
typedef 
   struct {
      HChar* buf;
      Int    buf_size;
      Int    buf_used;
   } 
   snprintf_buf;

static void add_to_vg_snprintf_buf ( HChar c, void* p )
{
   snprintf_buf* b = p;
   if (b->buf_size > 0 && b->buf_used < b->buf_size) {
      b->buf[b->buf_used++] = c;
      if (b->buf_used < b->buf_size)
         b->buf[b->buf_used] = 0;
      else
         b->buf[b->buf_size-1] = 0; /* pre: b->buf_size > 0 */
   } 
}

UInt VG_(vsnprintf) ( Char* buf, Int size, const HChar *format, va_list vargs )
{
   Int ret;
   snprintf_buf b;
   b.buf      = buf;
   b.buf_size = size < 0 ? 0 : size;
   b.buf_used = 0;

   ret = VG_(debugLog_vprintf) 
            ( add_to_vg_snprintf_buf, &b, format, vargs );

   return b.buf_used;
}

UInt VG_(snprintf) ( Char* buf, Int size, const HChar *format, ... )
{
   UInt ret;
   va_list vargs;

   va_start(vargs,format);
   ret = VG_(vsnprintf)(buf, size, format, vargs);
   va_end(vargs);

   return ret;
}


/* ---------------------------------------------------------------------
   percentify()
   ------------------------------------------------------------------ */

// Percentify n/m with d decimal places.  Includes the '%' symbol at the end.
// Right justifies in 'buf'.
void VG_(percentify)(ULong n, ULong m, UInt d, Int n_buf, char buf[]) 
{
   Int i, len, space;
   ULong p1;
   Char fmt[32];

   if (m == 0) {
      // Have to generate the format string in order to be flexible about
      // the width of the field.
      VG_(sprintf)(fmt, "%%-%ds", n_buf);
      // fmt is now "%<n_buf>s" where <d> is 1,2,3...
      VG_(sprintf)(buf, fmt, "--%");
      return;
   }
   
   p1 = (100*n) / m;
    
   if (d == 0) {
      VG_(sprintf)(buf, "%lld%%", p1);
   } else {
      ULong p2;
      UInt  ex;
      switch (d) {
      case 1: ex = 10;    break;
      case 2: ex = 100;   break;
      case 3: ex = 1000;  break;
      default: VG_(tool_panic)("Currently can only handle 3 decimal places");
      }
      p2 = ((100*n*ex) / m) % ex;
      // Have to generate the format string in order to be flexible about
      // the width of the post-decimal-point part.
      VG_(sprintf)(fmt, "%%lld.%%0%dlld%%%%", d);
      // fmt is now "%lld.%0<d>lld%%" where <d> is 1,2,3...
      VG_(sprintf)(buf, fmt, p1, p2);
   }

   len = VG_(strlen)(buf);
   space = n_buf - len;
   if (space < 0) space = 0;     /* Allow for v. small field_width */
   i = len;

   /* Right justify in field */
   for (     ; i >= 0;    i--)  buf[i + space] = buf[i];
   for (i = 0; i < space; i++)  buf[i] = ' ';
}


/* ---------------------------------------------------------------------
   elapsed_wallclock_time()
   ------------------------------------------------------------------ */

/* Get the elapsed wallclock time since startup into buf, which must
   16 chars long.  This is unchecked.  It also relies on the
   millisecond timer having been set to zero by an initial read in
   m_main during startup. */

void VG_(elapsed_wallclock_time) ( /*OUT*/HChar* buf )
{
   UInt t, ms, s, mins, hours, days;

   t  = VG_(read_millisecond_timer)(); /* milliseconds */

   ms = t % 1000;
   t /= 1000; /* now in seconds */

   s = t % 60;
   t /= 60; /* now in minutes */

   mins = t % 60;
   t /= 60; /* now in hours */

   hours = t % 24;
   t /= 24; /* now in days */

   days = t;

   VG_(sprintf)(buf, "%02u:%02u:%02u:%02u.%03u", days, hours, mins, s, ms);
}


/* ---------------------------------------------------------------------
   message()
   ------------------------------------------------------------------ */

UInt VG_(vmessage) ( VgMsgKind kind, const HChar* format, va_list vargs )
{
   UInt count = 0;
   Char c;
   Int  i, depth;

   switch (kind) {
      case Vg_UserMsg:       c = '='; break;
      case Vg_DebugMsg:      c = '-'; break;
      case Vg_DebugExtraMsg: c = '+'; break;
      case Vg_ClientMsg:     c = '*'; break;
      default:               c = '?'; break;
   }

   // Print one '>' in front of the messages for each level of self-hosting
   // being performed.
   depth = RUNNING_ON_VALGRIND;
   for (i = 0; i < depth; i++) {
      count += VG_(printf) (">");
   }
   
   if (!VG_(clo_xml))
      count += VG_(printf) ("%c%c", c,c);

   if (VG_(clo_time_stamp)) {
      HChar buf[50];
      VG_(elapsed_wallclock_time)(buf);
      count += VG_(printf)( "%s ", buf);
   }

   if (!VG_(clo_xml))
      count += VG_(printf) ("%d%c%c ", VG_(getpid)(), c,c);

   count += VG_(vprintf)(format, vargs);
   count += VG_(printf) ("\n");
   return count;
}

/* Send a simple single-part message. */
UInt VG_(message) ( VgMsgKind kind, const HChar* format, ... )
{
   UInt count;
   va_list vargs;
   va_start(vargs,format);
   count = VG_(vmessage) ( kind, format, vargs );
   va_end(vargs);
   return count;
}

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