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111 lines
2.0 KiB
111 lines
2.0 KiB
/*
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* debugging malloc()/realloc()/calloc()/free() that attempts
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* to keep track of just what's been allocated today.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#define MAGIC 0x1f2e3d4c
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struct alist { int magic, size; struct alist *next, *last; };
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static struct alist list = { 0, 0, 0, 0 };
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static int mallocs=0;
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static int reallocs=0;
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static int frees=0;
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void *
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acalloc(int size, int count)
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{
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struct alist *ret = calloc(size + sizeof(struct alist), count);
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if ( ret ) {
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ret->magic = MAGIC;
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ret->size = size * count;
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if ( list.next ) {
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ret->next = list.next;
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ret->last = &list;
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ret->next->last = ret;
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list.next = ret;
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}
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else {
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ret->last = ret->next = &list;
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list.next = list.last = ret;
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}
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++mallocs;
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return ret+1;
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}
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return 0;
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}
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void*
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amalloc(int size)
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{
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return acalloc(size,1);
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}
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void
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afree(void *ptr)
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{
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struct alist *p2 = ((struct alist*)ptr)-1;
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if ( p2->magic == MAGIC ) {
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p2->last->next = p2->next;
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p2->next->last = p2->last;
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++frees;
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free(p2);
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}
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else
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free(ptr);
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}
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void *
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arealloc(void *ptr, int size)
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{
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struct alist *p2 = ((struct alist*)ptr)-1;
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struct alist save;
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if ( p2->magic == MAGIC ) {
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save.next = p2->next;
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save.last = p2->last;
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p2 = realloc(p2, sizeof(*p2) + size);
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if ( p2 ) {
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p2->size = size;
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p2->next->last = p2;
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p2->last->next = p2;
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++reallocs;
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return p2+1;
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}
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else {
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save.next->last = save.last;
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save.last->next = save.next;
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return 0;
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}
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}
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return realloc(ptr, size);
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}
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void
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adump()
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{
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struct alist *p;
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for ( p = list.next; p && (p != &list); p = p->next ) {
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fprintf(stderr, "allocated: %d byte%s\n", p->size, (p->size==1) ? "" : "s");
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fprintf(stderr, " [%.*s]\n", p->size, p+1);
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}
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if ( getenv("AMALLOC_STATISTICS") ) {
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fprintf(stderr, "%d malloc%s\n", mallocs, (mallocs==1)?"":"s");
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fprintf(stderr, "%d realloc%s\n", reallocs, (reallocs==1)?"":"s");
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fprintf(stderr, "%d free%s\n", frees, (frees==1)?"":"s");
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}
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}
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