From c973bcc1039b64ec00acaf8e8d61b9f5229da56f Mon Sep 17 00:00:00 2001 From: David Oberhollenzer Date: Mon, 7 Oct 2019 15:26:32 +0200 Subject: Cleanup: move libutil related headers to "util" sub directory Signed-off-by: David Oberhollenzer --- include/util/util.h | 67 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) create mode 100644 include/util/util.h (limited to 'include/util/util.h') diff --git a/include/util/util.h b/include/util/util.h new file mode 100644 index 0000000..881b59c --- /dev/null +++ b/include/util/util.h @@ -0,0 +1,67 @@ +/* SPDX-License-Identifier: LGPL-3.0-or-later */ +/* + * util.h + * + * Copyright (C) 2019 David Oberhollenzer + */ +#ifndef UTIL_H +#define UTIL_H + +#include "config.h" +#include "sqfs/predef.h" + +#include +#include + +#include "compat.h" + +#if defined(__GNUC__) || defined(__clang__) +#define UI_ADD_OV __builtin_uadd_overflow +#define UL_ADD_OV __builtin_uaddl_overflow +#define ULL_ADD_OV __builtin_uaddll_overflow + +#define UI_MUL_OV __builtin_umul_overflow +#define UL_MUL_OV __builtin_umull_overflow +#define ULL_MUL_OV __builtin_umulll_overflow +#else +#error Sorry, I do not know how to trap integer overflows with this compiler +#endif + +#if SIZEOF_SIZE_T <= SIZEOF_INT +#define SZ_ADD_OV UI_ADD_OV +#define SZ_MUL_OV UI_MUL_OV +#elif SIZEOF_SIZE_T == SIZEOF_LONG +#define SZ_ADD_OV UL_ADD_OV +#define SZ_MUL_OV UL_MUL_OV +#elif SIZEOF_SIZE_T == SIZEOF_LONG_LONG +#define SZ_ADD_OV ULL_ADD_OV +#define SZ_MUL_OV ULL_MUL_OV +#else +#error Cannot determine maximum value of size_t +#endif + +/* + Helper for allocating data structures with flexible array members. + + 'base_size' is the size of the struct itself, 'item_size' the size of a + single array element and 'nmemb' the number of elements. + + Iternally checks for arithmetic overflows when allocating the combined thing. + */ +SQFS_INTERNAL +void *alloc_flex(size_t base_size, size_t item_size, size_t nmemb); + +/* Basically the same as calloc, but *ALWAYS* does overflow checking */ +SQFS_INTERNAL +void *alloc_array(size_t item_size, size_t nmemb); + +/* + Convert back to forward slashed, remove all preceeding and trailing slashes, + collapse all sequences of slashes, remove all path components that are '.' + and returns failure state if one of the path components is '..'. + + Returns 0 on success. +*/ +SQFS_INTERNAL int canonicalize_name(char *filename); + +#endif /* UTIL_H */ -- cgit v1.2.3