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| | /* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright Red Hat
* Author: David Gibson <david@gibson.dropbear.id.au>
*
* Definitions used by both passt/pasta and other tools
*/
#ifndef COMMON_H
#define COMMON_H
#include <string.h>
#define VERSION_BLOB \
VERSION "\n" \
"Copyright Red Hat\n" \
"GNU General Public License, version 2 or later\n" \
" <https://www.gnu.org/licenses/old-licenses/gpl-2.0.html>\n" \
"This is free software: you are free to change and redistribute it.\n" \
"There is NO WARRANTY, to the extent permitted by law.\n\n"
#ifndef MIN
#define MIN(x, y) (((x) < (y)) ? (x) : (y))
#endif
#ifndef MAX
#define MAX(x, y) (((x) > (y)) ? (x) : (y))
#endif
#define MAX_FROM_BITS(n) (((1U << (n)) - 1))
/* FPRINTF() intentionally silences cert-err33-c clang-tidy warnings */
#define FPRINTF(f, ...) (void)fprintf(f, __VA_ARGS__)
#define ARRAY_SIZE(a) ((int)(sizeof(a) / sizeof((a)[0])))
#define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
#define DIV_ROUND_CLOSEST(n, d) (((n) + (d) / 2) / (d))
#define ROUND_DOWN(x, y) ((x) & ~((y) - 1))
#define ROUND_UP(x, y) (((x) + (y) - 1) & ~((y) - 1))
#define UINT16_STRLEN (sizeof("65535"))
/*
* Starting from glibc 2.40.9000 and commit 25a5eb4010df ("string: strerror,
* strsignal cannot use buffer after dlmopen (bug 32026)"), strerror() needs
* getrandom(2) and brk(2) as it allocates memory for the locale-translated
* error description, but our seccomp profiles forbid both.
*
* Use the strerror_() wrapper instead, calling into strerrordesc_np() to get
* a static untranslated string. It's a GNU implementation, but also defined by
* bionic.
*
* If strerrordesc_np() is not defined (e.g. musl), call strerror(). C libraries
* not defining strerrordesc_np() are expected to provide strerror()
* implementations that are simple enough for us to call.
*/
__attribute__ ((weak)) const char *strerrordesc_np(int errnum);
/**
* strerror_() - strerror() wrapper calling strerrordesc_np() if available
* @errnum: Error code
*
* Return: error description string
*/
static inline const char *strerror_(int errnum)
{
if (strerrordesc_np)
return strerrordesc_np(errnum);
return strerror(errnum);
}
#define strerror(x) @ "Don't call strerror() directly, use strerror_() instead"
#ifndef __bswap_constant_16
#define __bswap_constant_16(x) \
((uint16_t) ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8)))
#endif
#ifndef __bswap_constant_32
#define __bswap_constant_32(x) \
((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \
(((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24))
#endif
#ifndef __bswap_constant_64
#define __bswap_constant_64(x) \
((((x) & 0xff00000000000000ULL) >> 56) | \
(((x) & 0x00ff000000000000ULL) >> 40) | \
(((x) & 0x0000ff0000000000ULL) >> 24) | \
(((x) & 0x000000ff00000000ULL) >> 8) | \
(((x) & 0x00000000ff000000ULL) << 8) | \
(((x) & 0x0000000000ff0000ULL) << 24) | \
(((x) & 0x000000000000ff00ULL) << 40) | \
(((x) & 0x00000000000000ffULL) << 56))
#endif
#if __BYTE_ORDER == __BIG_ENDIAN
#define htons_constant(x) (x)
#define htonl_constant(x) (x)
#define htonll_constant(x) (x)
#define ntohs_constant(x) (x)
#define ntohl_constant(x) (x)
#define ntohll_constant(x) (x)
#else
#define htons_constant(x) (__bswap_constant_16(x))
#define htonl_constant(x) (__bswap_constant_32(x))
#define htonll_constant(x) (__bswap_constant_64(x))
#define ntohs_constant(x) (__bswap_constant_16(x))
#define ntohl_constant(x) (__bswap_constant_32(x))
#define ntohll_constant(x) (__bswap_constant_64(x))
#endif
#define ntohll(x) (be64toh((x)))
#define htonll(x) (htobe64((x)))
#endif /* COMMON_H */
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