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clean up, avoid aliasing concerns in non-debug case

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tg
2016-02-26 21:53:37 +00:00
parent 4a21365067
commit f23ed68f00
3 changed files with 23 additions and 23 deletions
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18
lalloc.c
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@ -23,7 +23,7 @@
#include <err.h>
#endif
__RCSID("$MirOS: src/bin/mksh/lalloc.c,v 1.25 2016/02/24 02:08:39 tg Exp $");
__RCSID("$MirOS: src/bin/mksh/lalloc.c,v 1.26 2016/02/26 21:53:36 tg Exp $");
/* build with CPPFLAGS+= -DUSE_REALLOC_MALLOC=0 on ancient systems */
#if defined(USE_REALLOC_MALLOC) && (USE_REALLOC_MALLOC == 0)
@ -36,7 +36,7 @@ __RCSID("$MirOS: src/bin/mksh/lalloc.c,v 1.25 2016/02/24 02:08:39 tg Exp $");
static struct lalloc_common *findptr(struct lalloc_common **, char *, Area *);
#ifndef MKSH_ALLOC_CATCH_UNDERRUNS
#define ALLOC_ISUNALIGNED(p) (((size_t)(p)) % ALLOC_SIZE)
#define ALLOC_ISUNALIGNED(p) (((size_t)(p)) % sizeof(struct lalloc_common))
#else
#define ALLOC_ISUNALIGNED(p) (((size_t)(p)) & 4095)
#undef remalloc
@ -107,10 +107,10 @@ findptr(struct lalloc_common **lpp, char *ptr, Area *ap)
#endif
/* get address of ALLOC_ITEM from user item */
/*
* note: the alignment of "ptr" to ALLOC_SIZE is checked
* note: the alignment of "ptr" to ALLOC_ITEM is checked
* above; the "void *" gets us rid of a gcc 2.95 warning
*/
*lpp = (lp = ptr - ALLOC_SIZE);
*lpp = (lp = ptr - sizeof(ALLOC_ITEM));
/* search for allocation item in group list */
while (ap->next != lp)
if ((ap = ap->next) == NULL) {
@ -126,7 +126,7 @@ findptr(struct lalloc_common **lpp, char *ptr, Area *ap)
internal_errorf("rogue pointer %zX", (size_t)ptr);
#endif
}
return ((void *)ap);
return (ap);
}
void *
@ -150,18 +150,18 @@ aresize(void *ptr, size_t numb, Area *ap)
pp->next = lp->next;
}
if (notoktoadd(numb, ALLOC_SIZE) ||
(lp = remalloc(lp, numb + ALLOC_SIZE)) == NULL
if (notoktoadd(numb, sizeof(ALLOC_ITEM)) ||
(lp = remalloc(lp, numb + sizeof(ALLOC_ITEM))) == NULL
#ifndef MKSH_SMALL
|| ALLOC_ISUNALIGNED(lp)
#endif
)
internal_errorf(Toomem, numb);
/* this only works because Area and ALLOC_ITEM share lalloc_common */
/* area pointer and items share struct lalloc_common */
lp->next = ap->next;
ap->next = lp;
/* return user item address */
return ((char *)lp + ALLOC_SIZE);
return ((char *)lp + sizeof(ALLOC_ITEM));
}
void