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Add reallocarray clone so we can stop doing multiply-then-reallocate

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This commit is contained in:
Nick Mathewson 2014-08-13 10:27:13 -04:00
parent bb68c731b8
commit 19b137bc05
2 changed files with 17 additions and 0 deletions
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14
src/common/util.c
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@ -244,6 +244,20 @@ tor_realloc_(void *ptr, size_t size DMALLOC_PARAMS)
return result;
}
/**
* Try to realloc <b>ptr</b> so that it takes up sz1 * sz2 bytes. Check for
* overflow. Unlike other allocation functions, return NULL on overflow.
*/
void *
tor_reallocarray_(void *ptr, size_t sz1, size_t sz2 DMALLOC_PARAMS)
{
/* XXXX we can make this return 0, but we would need to check all the
* reallocarray users. */
tor_assert(sz2 == 0 || sz1 < SIZE_T_CEILING / sz2);
return tor_realloc(ptr, (sz1 * sz2) DMALLOC_FN_ARGS);
}
/** Return a newly allocated copy of the NUL-terminated string s. On
* error, log and terminate. (Like strdup(s), but never returns
* NULL.)

3
src/common/util.h
View File

@ -79,6 +79,7 @@ void *tor_malloc_(size_t size DMALLOC_PARAMS) ATTR_MALLOC;
void *tor_malloc_zero_(size_t size DMALLOC_PARAMS) ATTR_MALLOC;
void *tor_calloc_(size_t nmemb, size_t size DMALLOC_PARAMS) ATTR_MALLOC;
void *tor_realloc_(void *ptr, size_t size DMALLOC_PARAMS);
void *tor_reallocarray_(void *ptr, size_t size1, size_t size2 DMALLOC_PARAMS);
char *tor_strdup_(const char *s DMALLOC_PARAMS) ATTR_MALLOC ATTR_NONNULL((1));
char *tor_strndup_(const char *s, size_t n DMALLOC_PARAMS)
ATTR_MALLOC ATTR_NONNULL((1));
@ -116,6 +117,8 @@ extern int dmalloc_free(const char *file, const int line, void *pnt,
#define tor_malloc_zero(size) tor_malloc_zero_(size DMALLOC_ARGS)
#define tor_calloc(nmemb,size) tor_calloc_(nmemb, size DMALLOC_ARGS)
#define tor_realloc(ptr, size) tor_realloc_(ptr, size DMALLOC_ARGS)
#define tor_reallocarray(ptr, sz1, sz2) \
tor_reallocarray_((ptr), (sz1), (sz2) DMALLOC_ARGS)
#define tor_strdup(s) tor_strdup_(s DMALLOC_ARGS)
#define tor_strndup(s, n) tor_strndup_(s, n DMALLOC_ARGS)
#define tor_memdup(s, n) tor_memdup_(s, n DMALLOC_ARGS)