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*/