1 /* $NetBSD: alloc.c,v 1.12 2003/08/07 09:05:03 agc 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)alloc.c 8.1 (Berkeley) 5/31/93"; 36 #else 37 __RCSID("$NetBSD: alloc.c,v 1.12 2003/08/07 09:05:03 agc Exp $"); 38 #endif 39 #endif /* not lint */ 40 41 #include <sys/types.h> 42 43 #include <unistd.h> 44 #include <stdarg.h> 45 #include <stdlib.h> 46 47 #include "csh.h" 48 #include "extern.h" 49 50 char *memtop = NULL; /* PWP: top of current memory */ 51 char *membot = NULL; /* PWP: bottom of allocatable memory */ 52 53 ptr_t 54 Malloc(size_t n) 55 { 56 ptr_t ptr; 57 58 if (membot == NULL) 59 memtop = membot = sbrk(0); 60 if ((ptr = malloc(n)) == (ptr_t) 0) { 61 child++; 62 stderror(ERR_NOMEM); 63 } 64 return (ptr); 65 } 66 67 ptr_t 68 Realloc(ptr_t p, size_t n) 69 { 70 ptr_t ptr; 71 72 if (membot == NULL) 73 memtop = membot = sbrk(0); 74 if ((ptr = realloc(p, n)) == (ptr_t) 0) { 75 child++; 76 stderror(ERR_NOMEM); 77 } 78 return (ptr); 79 } 80 81 ptr_t 82 Calloc(size_t s, size_t n) 83 { 84 ptr_t ptr; 85 86 if (membot == NULL) 87 memtop = membot = sbrk(0); 88 if ((ptr = calloc(s, n)) == (ptr_t) 0) { 89 child++; 90 stderror(ERR_NOMEM); 91 } 92 return (ptr); 93 } 94 95 void 96 Free(ptr_t p) 97 { 98 if (p) 99 free(p); 100 } 101 102 /* 103 * mstats - print out statistics about malloc 104 * 105 * Prints two lines of numbers, one showing the length of the free list 106 * for each size category, the second showing the number of mallocs - 107 * frees for each size category. 108 */ 109 void 110 /*ARGSUSED*/ 111 showall(Char **v, struct command *t) 112 { 113 memtop = (char *)sbrk(0); 114 (void)fprintf(cshout, "Allocated memory from 0x%lx to 0x%lx (%ld).\n", 115 (unsigned long)membot, (unsigned long)memtop, 116 (unsigned long)(memtop - membot)); 117 } 118