1 /* $NetBSD: alloc.c,v 1.10 2001/09/14 14:03:59 wiz Exp $ */ 2 3 /*- 4 * Copyright (c) 1983, 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)alloc.c 8.1 (Berkeley) 5/31/93"; 40 #else 41 __RCSID("$NetBSD: alloc.c,v 1.10 2001/09/14 14:03:59 wiz Exp $"); 42 #endif 43 #endif /* not lint */ 44 45 #include <sys/types.h> 46 47 #include <unistd.h> 48 #include <stdlib.h> 49 50 #if __STDC__ 51 # include <stdarg.h> 52 #else 53 # include <varargs.h> 54 #endif 55 56 #include "csh.h" 57 #include "extern.h" 58 59 char *memtop = NULL; /* PWP: top of current memory */ 60 char *membot = NULL; /* PWP: bottom of allocatable memory */ 61 62 ptr_t 63 Malloc(size_t n) 64 { 65 ptr_t ptr; 66 67 if (membot == NULL) 68 memtop = membot = sbrk(0); 69 if ((ptr = malloc(n)) == (ptr_t) 0) { 70 child++; 71 stderror(ERR_NOMEM); 72 } 73 return (ptr); 74 } 75 76 ptr_t 77 Realloc(ptr_t p, size_t n) 78 { 79 ptr_t ptr; 80 81 if (membot == NULL) 82 memtop = membot = sbrk(0); 83 if ((ptr = realloc(p, n)) == (ptr_t) 0) { 84 child++; 85 stderror(ERR_NOMEM); 86 } 87 return (ptr); 88 } 89 90 ptr_t 91 Calloc(size_t s, size_t n) 92 { 93 ptr_t ptr; 94 95 if (membot == NULL) 96 memtop = membot = sbrk(0); 97 if ((ptr = calloc(s, n)) == (ptr_t) 0) { 98 child++; 99 stderror(ERR_NOMEM); 100 } 101 return (ptr); 102 } 103 104 void 105 Free(ptr_t p) 106 { 107 if (p) 108 free(p); 109 } 110 111 /* 112 * mstats - print out statistics about malloc 113 * 114 * Prints two lines of numbers, one showing the length of the free list 115 * for each size category, the second showing the number of mallocs - 116 * frees for each size category. 117 */ 118 void 119 /*ARGSUSED*/ 120 showall(Char **v, struct command *t) 121 { 122 memtop = (char *)sbrk(0); 123 (void)fprintf(cshout, "Allocated memory from 0x%lx to 0x%lx (%ld).\n", 124 (unsigned long)membot, (unsigned long)memtop, 125 (unsigned long)(memtop - membot)); 126 } 127