1 /* $OpenBSD: alloc.c,v 1.9 2003/06/11 21:09:50 deraadt Exp $ */ 2 /* $NetBSD: alloc.c,v 1.6 1995/03/21 09:02:23 cgd Exp $ */ 3 4 /*- 5 * Copyright (c) 1983, 1991, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)alloc.c 8.1 (Berkeley) 5/31/93"; 36 #else 37 static char rcsid[] = "$OpenBSD: alloc.c,v 1.9 2003/06/11 21:09:50 deraadt Exp $"; 38 #endif 39 #endif /* not lint */ 40 41 #include <sys/types.h> 42 #include <unistd.h> 43 #include <stdlib.h> 44 #include <stdarg.h> 45 46 #include "csh.h" 47 #include "extern.h" 48 49 char *memtop = NULL; /* PWP: top of current memory */ 50 char *membot = NULL; /* PWP: bottom of allocatable memory */ 51 52 ptr_t 53 Malloc(size_t n) 54 { 55 ptr_t ptr; 56 57 if (membot == NULL) 58 memtop = membot = sbrk(0); 59 if ((ptr = malloc(n)) == (ptr_t) 0) { 60 child++; 61 stderror(ERR_NOMEM); 62 } 63 return (ptr); 64 } 65 66 ptr_t 67 Realloc(ptr_t p, size_t n) 68 { 69 ptr_t ptr; 70 71 if (membot == NULL) 72 memtop = membot = sbrk(0); 73 if ((ptr = realloc(p, n)) == (ptr_t) 0) { 74 child++; 75 stderror(ERR_NOMEM); 76 } 77 return (ptr); 78 } 79 80 ptr_t 81 Calloc(size_t s, size_t n) 82 { 83 ptr_t ptr; 84 85 if (membot == NULL) 86 memtop = membot = sbrk(0); 87 if ((ptr = calloc(s, n)) == (ptr_t) 0) { 88 child++; 89 stderror(ERR_NOMEM); 90 } 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 (%d).\n", 115 (unsigned long) membot, (unsigned long) memtop, (int)(memtop - membot)); 116 } 117