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 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 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 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 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*/ 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