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/* Copyright (C) 1991-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <intprops.h>
#include <ldsodefs.h>
#include <libc-pointer-arith.h>
#include <libintl.h>
#include <libio/iolibio.h>
#include <setvmaname.h>
#include <sys/uio.h>
#include <unistd.h>
extern const char *__progname;
#define fflush(s) _IO_fflush (s)
/* This function, when passed a string containing an asserted
expression, a filename, and a line number, prints a message
on the standard error stream of the form:
a.c:10: foobar: Assertion `a == b' failed.
It then aborts program execution via a call to `abort'. */
#ifdef FATAL_PREPARE_INCLUDE
# include FATAL_PREPARE_INCLUDE
#endif
void
__assert_fail_base (const char *fmt, const char *assertion, const char *file,
unsigned int line, const char *function)
{
char *str;
#ifdef FATAL_PREPARE
FATAL_PREPARE;
#endif
int total = __asprintf (&str, fmt,
__progname, __progname[0] ? ": " : "",
file, line,
function ? function : "", function ? ": " : "",
assertion);
if (total >= 0)
{
/* Print the message. */
(void) __fxprintf (NULL, "%s", str);
(void) fflush (stderr);
total = ALIGN_UP (total + sizeof (struct abort_msg_s) + 1,
GLRO(dl_pagesize));
struct abort_msg_s *buf = __mmap (NULL, total, PROT_READ | PROT_WRITE,
MAP_ANON | MAP_PRIVATE, -1, 0);
if (__glibc_likely (buf != MAP_FAILED))
{
buf->size = total;
strcpy (buf->msg, str);
__set_vma_name (buf, total, " glibc: assert");
/* We have to free the old buffer since the application might
catch the SIGABRT signal. */
struct abort_msg_s *old = atomic_exchange_acquire (&__abort_msg, buf);
if (old != NULL)
__munmap (old, old->size);
}
free (str);
}
else
{
/* At least print a minimal message. */
char linebuf[INT_STRLEN_BOUND (int) + sizeof ":: "];
struct iovec v[9];
int i = 0;
#define WS(s) (v[i].iov_len = strlen (v[i].iov_base = (void *) (s)), i++)
if (__progname)
{
WS (__progname);
WS (": ");
}
WS (file);
v[i++] = (struct iovec) {.iov_base = linebuf,
.iov_len = sprintf (linebuf, ":%d: ", line)};
if (function)
{
WS (function);
WS (": ");
}
WS ("Assertion `");
WS (assertion);
/* We omit the '.' here so that the assert tests can tell when
this code path is taken. */
WS ("' failed\n");
(void) __writev (STDERR_FILENO, v, i);
}
abort ();
}
#undef __assert_fail
void
__assert_fail (const char *assertion, const char *file, unsigned int line,
const char *function)
{
__assert_fail_base (_("%s%s%s:%u: %s%sAssertion `%s' failed.\n"),
assertion, file, line, function);
}
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