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.

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1.    /*	SCCS Id: @(#)alloc.c	3.4	1995/10/04	*/
2.    /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
3.    /* NetHack may be freely redistributed.  See license for details. */
4.    

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.

5.    /* to get the malloc() prototype from system.h */
6.    #define ALLOC_C		/* comment line for pre-compiled headers */
7.    /* since this file is also used in auxiliary programs, don't include all the
8.     * function declarations for all of nethack
9.     */
10.   #define EXTERN_H	/* comment line for pre-compiled headers */
11.   #include "config.h"
12.   
13.   #if defined(MONITOR_HEAP) || defined(WIZARD)
14.   char *FDECL(fmt_ptr, (const genericptr,char *));
15.   #endif
16.   
17.   #ifdef MONITOR_HEAP
18.   #undef alloc
19.   #undef free
20.   extern void FDECL(free,(genericptr_t));
21.   static void NDECL(heapmon_init);
22.   
23.   static FILE *heaplog = 0;
24.   static boolean tried_heaplog = FALSE;
25.   #endif
26.   
27.   long *FDECL(alloc,(unsigned int));
28.   extern void VDECL(panic, (const char *,...)) PRINTF_F(1,2);
29.   
30.   

alloc

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

31.   long *
32.   alloc(lth)
33.   register unsigned int lth;
34.   {
35.   #ifdef LINT
36.   /*
37.    * a ridiculous definition, suppressing
38.    *	"possible pointer alignment problem" for (long *) malloc()
39.    * from lint
40.    */
41.   	long dummy = ftell(stderr);
42.   
43.   	if(lth) dummy = 0;	/* make sure arg is used */
44.   	return(&dummy);
45.   #else
46.   	register genericptr_t ptr;
47.   
48.   	ptr = malloc(lth);
49.   #ifndef MONITOR_HEAP
50.   	if (!ptr) panic("Memory allocation failure; cannot get %u bytes", lth);
51.   #endif
52.   	return((long *) ptr);
53.   #endif
54.   }
55.   
56.   

fmt_ptr

57.   #if defined(MONITOR_HEAP) || defined(WIZARD)
58.   
59.   # if defined(MICRO) || defined(WIN32)
60.   /* we actually want to know which systems have an ANSI run-time library
61.    * to know which support the new %p format for printing pointers.
62.    * due to the presence of things like gcc, NHSTDC is not a good test.
63.    * so we assume microcomputers have all converted to ANSI and bigger
64.    * computers which may have older libraries give reasonable results with
65.    * the cast.
66.    */
67.   #  define MONITOR_PTR_FMT
68.   # endif
69.   
70.   # ifdef MONITOR_PTR_FMT
71.   #  define PTR_FMT "%p"
72.   #  define PTR_TYP genericptr_t
73.   # else
74.   #  define PTR_FMT "%06lx"
75.   #  define PTR_TYP unsigned long
76.   # endif
77.   
78.   /* format a pointer for display purposes; caller supplies the result buffer */
79.   char *
80.   fmt_ptr(ptr, buf)
81.   const genericptr ptr;
82.   char *buf;
83.   {
84.   	Sprintf(buf, PTR_FMT, (PTR_TYP)ptr);
85.   	return buf;
86.   }
87.   
88.   #endif
89.   

heapmon_init

90.   #ifdef MONITOR_HEAP
91.   
92.   /* If ${NH_HEAPLOG} is defined and we can create a file by that name,
93.      then we'll log the allocation and release information to that file. */
94.   static void
95.   heapmon_init()
96.   {
97.   	char *logname = getenv("NH_HEAPLOG");
98.   
99.   	if (logname && *logname)
100.  		heaplog = fopen(logname, "w");
101.  	tried_heaplog = TRUE;
102.  }
103.  

nhalloc

104.  long *
105.  nhalloc(lth, file, line)
106.  unsigned int lth;
107.  const char *file;
108.  int line;
109.  {
110.  	long *ptr = alloc(lth);
111.  	char ptr_address[20];
112.  
113.  	if (!tried_heaplog) heapmon_init();
114.  	if (heaplog)
115.  		(void) fprintf(heaplog, "+%5u %s %4d %s\n", lth,
116.  				fmt_ptr((genericptr_t)ptr, ptr_address),
117.  				line, file);
118.  	/* potential panic in alloc() was deferred til here */
119.  	if (!ptr) panic("Cannot get %u bytes, line %d of %s",
120.  			lth, line, file);
121.  
122.  	return ptr;
123.  }
124.  

nhfree

125.  void
126.  nhfree(ptr, file, line)
127.  genericptr_t ptr;
128.  const char *file;
129.  int line;
130.  {
131.  	char ptr_address[20];
132.  
133.  	if (!tried_heaplog) heapmon_init();
134.  	if (heaplog)
135.  		(void) fprintf(heaplog, "-      %s %4d %s\n",
136.  				fmt_ptr((genericptr_t)ptr, ptr_address),
137.  				line, file);
138.  
139.  	free(ptr);
140.  }
141.  
142.  #endif /* MONITOR_HEAP */
143.  
144.  /*alloc.c*/