Source:NetHack 3.6.1/src/alloc.c

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Below is the full text to alloc.c from the source code of NetHack 3.6.1. To link to a particular line, write [[Source:NetHack 3.6.1/src/alloc.c#line123]], for example.

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 /* NetHack 3.6	alloc.c	$NHDT-Date: 1454376505 2016/02/02 01:28:25 $  $NHDT-Branch: NetHack-3.6.0 $:$NHDT-Revision: 1.16 $ */
 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
 /*-Copyright (c) Robert Patrick Rankin, 2012. */
 /* NetHack may be freely redistributed.  See license for details. */

The NetHack General Public License applies to screenshots, source code and other content from NetHack.

This content was modified from the original NetHack source code distribution (by splitting up NetHack content between wiki pages, and possibly further editing). See the page history for a list of who changed it, and on what dates.

 
 /* 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);
 
 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
 }
 
 #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;
 

fmt_ptr

 /* 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);
 }
 
 /* strdup() which uses our alloc() rather than libc's malloc(),
    with caller tracking */

nhdupstr

 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 */
 
 /* 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 */

dupstr

 char *
 dupstr(string)
 const char *string;
 {
     return strcpy((char *) alloc(strlen(string) + 1), string);
 }
 
 /*alloc.c*/