1 /*-
2 * Copyright (c) 1983, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * %sccs.include.redist.c%
6 */
7
8 #ifndef lint
9 static char sccsid[] = "@(#)alloc.c 8.1 (Berkeley) 05/31/93";
10 #endif /* not lint */
11
12 #include <sys/types.h>
13 #include <unistd.h>
14 #include <stdlib.h>
15 #if __STDC__
16 # include <stdarg.h>
17 #else
18 # include <varargs.h>
19 #endif
20
21 #include "csh.h"
22 #include "extern.h"
23
24 char *memtop = NULL; /* PWP: top of current memory */
25 char *membot = NULL; /* PWP: bottom of allocatable memory */
26
27 ptr_t
Malloc(n)28 Malloc(n)
29 size_t n;
30 {
31 ptr_t ptr;
32
33 if (membot == NULL)
34 memtop = membot = sbrk(0);
35 if ((ptr = malloc(n)) == (ptr_t) 0) {
36 child++;
37 stderror(ERR_NOMEM);
38 }
39 return (ptr);
40 }
41
42 ptr_t
Realloc(p,n)43 Realloc(p, n)
44 ptr_t p;
45 size_t n;
46 {
47 ptr_t ptr;
48
49 if (membot == NULL)
50 memtop = membot = sbrk(0);
51 if ((ptr = realloc(p, n)) == (ptr_t) 0) {
52 child++;
53 stderror(ERR_NOMEM);
54 }
55 return (ptr);
56 }
57
58 ptr_t
Calloc(s,n)59 Calloc(s, n)
60 size_t s, n;
61 {
62 ptr_t ptr;
63
64 if (membot == NULL)
65 memtop = membot = sbrk(0);
66 if ((ptr = calloc(s, n)) == (ptr_t) 0) {
67 child++;
68 stderror(ERR_NOMEM);
69 }
70
71 return (ptr);
72 }
73
74 void
Free(p)75 Free(p)
76 ptr_t p;
77 {
78 if (p)
79 free(p);
80 }
81
82 /*
83 * mstats - print out statistics about malloc
84 *
85 * Prints two lines of numbers, one showing the length of the free list
86 * for each size category, the second showing the number of mallocs -
87 * frees for each size category.
88 */
89 void
90 /*ARGSUSED*/
showall(v,t)91 showall(v, t)
92 Char **v;
93 struct command *t;
94 {
95 memtop = (char *) sbrk(0);
96 (void) fprintf(cshout, "Allocated memory from 0x%lx to 0x%lx (%ld).\n",
97 (unsigned long) membot, (unsigned long) memtop, memtop - membot);
98 }
99