linux/lib/errname.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/build_bug.h>
#include <linux/errno.h>
#include <linux/errname.h>
#include <linux/kernel.h>
#include <linux/math.h>

/*
 * Ensure these tables do not accidentally become gigantic if some
 * huge errno makes it in. On most architectures, the first table will
 * only have about 140 entries, but mips and parisc have more sparsely
 * allocated errnos (with EHWPOISON = 257 on parisc, and EDQUOT = 1133
 * on mips), so this wastes a bit of space on those - though we
 * special case the EDQUOT case.
 */
#define E …
static const char *names_0[] = …;
#undef E

#ifdef EREFUSED /* parisc */
static_assert(EREFUSED == ECONNREFUSED);
#endif
#ifdef ECANCELLED /* parisc */
static_assert(ECANCELLED == ECANCELED);
#endif
static_assert(…); /* everywhere */

#define E …
static const char *names_512[] = …;
#undef E

static const char *__errname(unsigned err)
{ … }

/*
 * errname(EIO) -> "EIO"
 * errname(-EIO) -> "-EIO"
 */
const char *errname(int err)
{ … }
EXPORT_SYMBOL(…);