Source:NetHack 3.4.3/src/alloc.c

Below is the full text to src/alloc.c from NetHack 3.4.3. To link to a particular line, write [[alloc.c#line123]], for example.

Top of file

/*	SCCS Id: @(#)alloc.c	3.4	1995/10/04	*/
/* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
/* 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"

#if defined(MONITOR_HEAP) || defined(WIZARD)
char *FDECL(fmt_ptr, (const genericptr,char *));
#endif

#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

alloc() takes one parameter, the number of bytes to reserve, and returns a pointer to a block of memory which is that big.

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

#if defined(MONITOR_HEAP) || defined(WIZARD)

# if defined(MICRO) || defined(WIN32)
/* we actually want to know which systems have an ANSI run-time library
* to know which support the new %p format for printing pointers.
* due to the presence of things like gcc, NHSTDC is not a good test.
* so we assume microcomputers have all converted to ANSI and bigger
* computers which may have older libraries give reasonable results with
* the cast.
*/
#  define MONITOR_PTR_FMT
# endif

# ifdef MONITOR_PTR_FMT
#  define PTR_FMT "%p"
#  define PTR_TYP genericptr_t
# else
#  define PTR_FMT "%06lx"
#  define PTR_TYP unsigned long
# endif

/* format a pointer for display purposes; caller supplies the result buffer */
char *
fmt_ptr(ptr, buf)
const genericptr ptr;
char *buf;
{
	Sprintf(buf, PTR_FMT, (PTR_TYP)ptr);
	return buf;
}

#endif

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);
	char ptr_address[20];

	if (!tried_heaplog) heapmon_init();
	if (heaplog)
		(void) fprintf(heaplog, "+%5u %s %4d %s\n", lth,
				fmt_ptr((genericptr_t)ptr, ptr_address),
				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;
{
	char ptr_address[20];

	if (!tried_heaplog) heapmon_init();
	if (heaplog)
		(void) fprintf(heaplog, "-      %s %4d %s\n",
				fmt_ptr((genericptr_t)ptr, ptr_address),
				line, file);

	free(ptr);
}

#endif /* MONITOR_HEAP */

/*alloc.c*/