testlib.c

/* testlib.c -- test functions for libbacktrace library
   Copyright (C) 2012-2020 Free Software Foundation, Inc.
   Written by Ian Lance Taylor, Google.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    (1) Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.

    (2) Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in
    the documentation and/or other materials provided with the
    distribution.

    (3) The name of the author may not be used to
    endorse or promote products derived from this software without
    specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.  */

#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "filenames.h"

#include "backtrace.h"

#include "testlib.h"

/* The backtrace state.  */

void *state;

/* The number of failures.  */

int failures;

/* Return the base name in a path.  */

const char *
base (const char *p)
{
  const char *last;
  const char *s;

  last = NULL;
  for (s = p; *s != '\0'; ++s)
    {
      if (IS_DIR_SEPARATOR (*s))
	last = s + 1;
    }
  return last != NULL ? last : p;
}

/* Check an entry in a struct info array.  */

void
check (const char *name, int index, const struct info *all, int want_lineno,
       const char *want_function, const char *want_file, int *failed)
{
  if (*failed)
    return;
  if (all[index].filename == NULL || all[index].function == NULL)
    {
      fprintf (stderr, "%s: [%d]: missing file name or function name\n",
	       name, index);
      *failed = 1;
      return;
    }
  if (strcmp (base (all[index].filename), want_file) != 0)
    {
      fprintf (stderr, "%s: [%d]: got %s expected %s\n", name, index,
	       all[index].filename, want_file);
      *failed = 1;
    }
  if (all[index].lineno != want_lineno)
    {
      fprintf (stderr, "%s: [%d]: got %d expected %d\n", name, index,
	       all[index].lineno, want_lineno);
      *failed = 1;
    }
  if (strcmp (all[index].function, want_function) != 0)
    {
      fprintf (stderr, "%s: [%d]: got %s expected %s\n", name, index,
	       all[index].function, want_function);
      *failed = 1;
    }
}

/* The backtrace callback function.  */

int
callback_one (void *vdata, uintptr_t pc ATTRIBUTE_UNUSED,
	      const char *filename, int lineno, const char *function)
{
  struct bdata *data = (struct bdata *) vdata;
  struct info *p;

  if (data->index >= data->max)
    {
      fprintf (stderr, "callback_one: callback called too many times\n");
      data->failed = 1;
      return 1;
    }

  p = &data->all[data->index];
  if (filename == NULL)
    p->filename = NULL;
  else
    {
      p->filename = strdup (filename);
      assert (p->filename != NULL);
    }
  p->lineno = lineno;
  if (function == NULL)
    p->function = NULL;
  else
    {
      p->function = strdup (function);
      assert (p->function != NULL);
    }
  ++data->index;

  return 0;
}

/* An error callback passed to backtrace.  */

void
error_callback_one (void *vdata, const char *msg, int errnum)
{
  struct bdata *data = (struct bdata *) vdata;

  fprintf (stderr, "%s", msg);
  if (errnum > 0)
    fprintf (stderr, ": %s", strerror (errnum));
  fprintf (stderr, "\n");
  data->failed = 1;
}

/* The backtrace_simple callback function.  */

int
callback_two (void *vdata, uintptr_t pc)
{
  struct sdata *data = (struct sdata *) vdata;

  if (data->index >= data->max)
    {
      fprintf (stderr, "callback_two: callback called too many times\n");
      data->failed = 1;
      return 1;
    }

  data->addrs[data->index] = pc;
  ++data->index;

  return 0;
}

/* An error callback passed to backtrace_simple.  */

void
error_callback_two (void *vdata, const char *msg, int errnum)
{
  struct sdata *data = (struct sdata *) vdata;

  fprintf (stderr, "%s", msg);
  if (errnum > 0)
    fprintf (stderr, ": %s", strerror (errnum));
  fprintf (stderr, "\n");
  data->failed = 1;
}

/* The backtrace_syminfo callback function.  */

void
callback_three (void *vdata, uintptr_t pc ATTRIBUTE_UNUSED,
		const char *symname, uintptr_t symval,
		uintptr_t symsize)
{
  struct symdata *data = (struct symdata *) vdata;

  if (symname == NULL)
    data->name = NULL;
  else
    {
      data->name = strdup (symname);
      assert (data->name != NULL);
    }
  data->val = symval;
  data->size = symsize;
}

/* The backtrace_syminfo error callback function.  */

void
error_callback_three (void *vdata, const char *msg, int errnum)
{
  struct symdata *data = (struct symdata *) vdata;

  fprintf (stderr, "%s", msg);
  if (errnum > 0)
    fprintf (stderr, ": %s", strerror (errnum));
  fprintf (stderr, "\n");
  data->failed = 1;
}

/* The backtrace_create_state error callback function.  */

void
error_callback_create (void *data ATTRIBUTE_UNUSED, const char *msg,
                       int errnum)
{
  fprintf (stderr, "%s", msg);
  if (errnum > 0)
    fprintf (stderr, ": %s", strerror (errnum));
  fprintf (stderr, "\n");
  exit (EXIT_FAILURE);
}