L4Re/departure

Annotated tests/dstest_host_client.cc

407:8cad2f65940f
2022-09-03 Paul Boddie Adjusted various output statements.
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/*
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 * Test dataspace operations.
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 *
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 * Copyright (C) 2020, 2021, 2022 Paul Boddie <paul@boddie.org.uk>
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 *
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 * This program is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU General Public License as
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 * published by the Free Software Foundation; either version 2 of
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 * the License, or (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor,
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 * Boston, MA  02110-1301, USA
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 */
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#include <l4/re/env.h>
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#include <l4/sys/err.h>
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#include <systypes/fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <fsclient/file.h>
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#include <mem/memory_utils.h>
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int main(int argc, char *argv[])
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{
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  if (argc < 4)
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  {
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    printf("Need filename, step and sample size.\n");
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    return 1;
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  }
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  /* Obtain filename and access parameters. */
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  char *filename = argv[1];
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  unsigned long step = atoi(argv[2]);
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  unsigned long sample = atoi(argv[3]);
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  /* Allocate a buffer for sampling from the file. */
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  char buf[sample + 1];
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  /* Obtain access to the filesystem. */
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  l4_cap_idx_t server = l4re_env_get_cap("server");
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  /* Invoke the open method to receive the file reference. */
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  file_t file;
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  long err = file_open(&file, filename, O_RDWR, server);
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  if (err)
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  {
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    printf("Could not obtain file: %s\n", l4sys_errtostr(err));
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    return 1;
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  }
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  /* A region of the file is mapped. */
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  err = file_mmap(&file, 0, page(10), 0, 0, file_region_flags(file.flags));
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  if (err)
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  {
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    printf("Could not map file region: %s\n", l4sys_errtostr(err));
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    return 1;
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  }
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  for (unsigned long offset = 0; offset < file_populated_span(&file); offset += step)
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  {
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    unsigned long remaining = file_populated_span(&file) - offset;
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    unsigned long sample_remaining = remaining < sample ? remaining : sample;
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    printf("%ld bytes from %p...\n", sample_remaining, (file.memory + offset));
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    strncpy(buf, (file.memory + offset), sample_remaining);
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    buf[sample_remaining] = '\0';
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    printf("%s\n", buf);
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  }
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  printf("File shown.\n");
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  printf("End of test.\n");
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  return 0;
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}
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