118 lines
2.2 KiB
C
118 lines
2.2 KiB
C
#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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int
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main (int argc, char **argv)
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{
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char *test_file;
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const char blah[] = "BLAH";
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FILE *fp;
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char *mmap_data;
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int ch, fd;
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struct stat fs;
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const char *cp;
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/* Construct the test file name based on ARGV[0], which will be
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an absolute file name in the build directory. Don't touch the
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source directory, which might be read-only. */
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if (argc != 1 || asprintf (&test_file, "%s.test", argv[0]) < 0)
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exit (99);
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/* setup the physical file, and use it */
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if ((fp = fopen (test_file, "w+")) == NULL)
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exit (1);
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if (fwrite (blah, 1, strlen (blah), fp) != strlen (blah))
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exit (2);
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rewind (fp);
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printf ("file: ");
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cp = blah;
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while ((ch = getc (fp)) != EOF)
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{
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fputc (ch, stdout);
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if (ch != *cp)
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{
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printf ("\ncharacter %td: '%c' instead of '%c'\n",
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cp - blah, ch, *cp);
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exit (1);
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}
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++cp;
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}
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fputc ('\n', stdout);
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if (ferror (fp))
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{
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puts ("fp: error");
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exit (1);
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}
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if (feof (fp))
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printf ("fp: EOF\n");
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else
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{
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puts ("not EOF");
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exit (1);
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}
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fclose (fp);
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/* Now, mmap the file into a buffer, and do that too */
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if ((fd = open (test_file, O_RDONLY)) == -1)
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exit (3);
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if (fstat (fd, &fs) == -1)
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exit (4);
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if ((mmap_data = (char *) mmap (NULL, fs.st_size, PROT_READ,
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MAP_SHARED, fd, 0)) == MAP_FAILED)
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{
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if (errno == ENOSYS)
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exit (0);
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exit (5);
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}
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if ((fp = fmemopen (mmap_data, fs.st_size, "r")) == NULL)
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exit (1);
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printf ("mem: ");
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cp = blah;
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while ((ch = getc (fp)) != EOF)
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{
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fputc (ch, stdout);
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if (ch != *cp)
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{
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printf ("%td character: '%c' instead of '%c'\n",
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cp - blah, ch, *cp);
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exit (1);
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}
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++cp;
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}
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fputc ('\n', stdout);
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if (ferror (fp))
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{
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puts ("fp: error");
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exit (1);
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}
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if (feof (fp))
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printf ("fp: EOF\n");
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else
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{
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puts ("not EOF");
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exit (1);
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}
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fclose (fp);
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munmap (mmap_data, fs.st_size);
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unlink (test_file);
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free (test_file);
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return 0;
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}
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