Source:NetHack 3.6.0/src/alloc.c

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  /* NetHack 3.6	alloc.c	$NHDT-Date: 1446975460 2015/11/08 09:37:40 $  $NHDT-Branch: master $:$NHDT-Revision: 1.14 $ */
  /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
  /* NetHack may be freely redistributed.  See license for details. */
  
  /* to get the malloc() prototype from system.h */
  #define ALLOC_C /* comment line for pre-compiled headers */
  /* since this file is also used in auxiliary programs, don't include all the
   * function declarations for all of nethack
   */
  #define EXTERN_H /* comment line for pre-compiled headers */
  #include "config.h"
  
  char *FDECL(fmt_ptr, (const genericptr));
  
  #ifdef MONITOR_HEAP
  #undef alloc
  #undef free
  extern void FDECL(free, (genericptr_t));
  static void NDECL(heapmon_init);
  
  static FILE *heaplog = 0;
  static boolean tried_heaplog = FALSE;
  #endif
  
  long *FDECL(alloc, (unsigned int));
  extern void
  VDECL(panic, (const char *, ...))
  PRINTF_F(1, 2);
 

alloc

  long *
  alloc(lth)
  register unsigned int lth;
  {
  #ifdef LINT
      /*
       * a ridiculous definition, suppressing
       *  "possible pointer alignment problem" for (long *) malloc()
       * from lint
       */
      long dummy = ftell(stderr);
  
      if (lth)
          dummy = 0; /* make sure arg is used */
      return &dummy;
  #else
      register genericptr_t ptr;
  
      ptr = malloc(lth);
  #ifndef MONITOR_HEAP
      if (!ptr)
          panic("Memory allocation failure; cannot get %u bytes", lth);
  #endif
      return (long *) ptr;
  #endif
  }
 

fmt_ptr

  #ifdef HAS_PTR_FMT
  #define PTR_FMT "%p"
  #define PTR_TYP genericptr_t
  #else
  #define PTR_FMT "%06lx"
  #define PTR_TYP unsigned long
  #endif
  
  /* A small pool of static formatting buffers.
   * PTRBUFSIZ:  We assume that pointers will be formatted as integers in
   * hexadecimal, requiring at least 16+1 characters for each buffer to handle
   * 64-bit systems, but the standard doesn't mandate that encoding and an
   * implementation could do something different for %p, so we make some
   * extra room.
   * PTRBUFCNT:  Number of formatted values which can be in use at the same
   * time.  To have more, callers need to make copies of them as they go.
   */
  #define PTRBUFCNT 4
  #define PTRBUFSIZ 32
  static char ptrbuf[PTRBUFCNT][PTRBUFSIZ];
  static int ptrbufidx = 0;
  
  /* format a pointer for display purposes; returns a static buffer */
  char *
  fmt_ptr(ptr)
  const genericptr ptr;
  {
      char *buf;
  
      buf = ptrbuf[ptrbufidx];
      if (++ptrbufidx >= PTRBUFCNT)
          ptrbufidx = 0;
  
      Sprintf(buf, PTR_FMT, (PTR_TYP) ptr);
      return buf;
  }
 

heapmon_init

  #ifdef MONITOR_HEAP
  
  /* If ${NH_HEAPLOG} is defined and we can create a file by that name,
     then we'll log the allocation and release information to that file. */
  static void
  heapmon_init()
  {
      char *logname = getenv("NH_HEAPLOG");
  
      if (logname && *logname)
          heaplog = fopen(logname, "w");
      tried_heaplog = TRUE;
  }
 

nhalloc

  long *
  nhalloc(lth, file, line)
  unsigned int lth;
  const char *file;
  int line;
  {
      long *ptr = alloc(lth);
  
      if (!tried_heaplog)
          heapmon_init();
      if (heaplog)
          (void) fprintf(heaplog, "+%5u %s %4d %s\n", lth,
                         fmt_ptr((genericptr_t) ptr), line, file);
      /* potential panic in alloc() was deferred til here */
      if (!ptr)
          panic("Cannot get %u bytes, line %d of %s", lth, line, file);
  
      return ptr;
  }
 

nhfree

  void
  nhfree(ptr, file, line)
  genericptr_t ptr;
  const char *file;
  int line;
  {
      if (!tried_heaplog)
          heapmon_init();
      if (heaplog)
          (void) fprintf(heaplog, "-      %s %4d %s\n",
                         fmt_ptr((genericptr_t) ptr), line, file);
  
      free(ptr);
  }
 

nhdupstr

  /* strdup() which uses our alloc() rather than libc's malloc(),
     with caller tracking */
  char *
  nhdupstr(string, file, line)
  const char *string;
  const char *file;
  int line;
  {
      return strcpy((char *) nhalloc(strlen(string) + 1, file, line), string);
  }
  #undef dupstr
  
  #endif /* MONITOR_HEAP */
 

dupstr

  /* strdup() which uses our alloc() rather than libc's malloc();
     not used when MONITOR_HEAP is enabled, but included unconditionally
     in case utility programs get built using a different setting for that */
  char *
  dupstr(string)
  const char *string;
  {
      return strcpy((char *) alloc(strlen(string) + 1), string);
  }
  
  /*alloc.c*/