203 lines
7.1 KiB
C++
203 lines
7.1 KiB
C++
/* */
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/* Special Conformance Test 17.2.0.3: Verification of freopen */
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/* */
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/* Other files needed: spc17.2.0.a - spc17.2.0.d - data files for the test */
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/* */
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/* Tester needs to verify that the files named spc17.2.0.a - spc17.2.0.d, */
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/* and located on the work prefix, have previously been created with the */
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/* test Special Conformance 17.2.0.2. */
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/* */
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/* The first action of the test will be to open spc17.2.0.a, and print its */
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/* contents on the screen. The tester needs to verify that the contents are */
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/* correct. */
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/* */
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/* The next action is to verify that standard input is working. The tester */
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/* will be prompted for a string; this string will then be written to both */
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/* standard out and standard error out. The tester needs to verify that the */
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/* output strings are correct. */
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/* */
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/* The test will then redirect standard in, standard out, and standard error */
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/* out. The contents of spc17.2.0.b will be sent to the files spc17.0.c, */
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/* the new standard out, and spc17.2.0.d, the new standard error out. The */
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/* tester needs to verify that the three files are identical. */
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/* */
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/* Finally, standard in, standard out, and standard error out will be reset */
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/* to their original values. The tester will be prompted for a new string */
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/* to be entered from the keyboard. The tester needs to verify that the */
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/* string is correctly echoed to the screen twice (once for standard out and */
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/* once for standard error out). */
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/* */
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#include <stdlib.h>
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#include <stdio.h>
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int main (void)
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{
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int i, j;
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char s [255]; /* input buffer */
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FILE *f1, *f2, *f3, *f4;
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FILE *saveStdin, *saveStdout, *saveStderr;
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char fn1 [14] = "3/spc17.2.0.a"; /* define filenames */
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char fn2 [14] = "3/spc17.2.0.b";
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char fn3 [14] = "3/spc17.2.0.c";
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char fn4 [14] = "3/spc17.2.0.d";
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f1 = fopen (fn1, "r"); /* open for reading */
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if (f1 == NULL)
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goto Fail;
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i = 0;
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while ((j = fgetc (f1)) != EOF) /* read successive */
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s [i++] = (char) j; /* chars into string */
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s [i] = '\0';
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printf ("This is the contents of 3/spc17.2.0.a:\n%s\n", s);
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f1 = freopen (fn2, "a+", f1); /* reassign file pointer */
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if (f1 == NULL)
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goto Fail2;
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i = fseek (f1, 0L, SEEK_END); /* move to end of file */
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if (i)
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goto Fail5;
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i = fputs ("This is the second line of file 3/spc17.2.0.b", f1);
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if (i == EOF)
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goto Fail3;
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rewind (f1);
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i = 0;
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while ((j = fgetc (f1)) != EOF) /* read successive */
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s [i++] = (char) j; /* chars into string */
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s [i] = '\0';
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printf ("\nThese are the updated contents of 3/spc17.2.0.b:\n%s\n", s);
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/* This part of the test verifies reopening standard in, standard out, and */
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/* standard error out. */
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printf ("Please enter a string\n"); /* 1st verify that standard in */
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j = 0; /* standard out and standard */
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while ((i = fgetc (stdin)) != '\n') /* error out work */
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{
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if (i == EOF)
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goto Fail7;
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s [j++] = i;
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}
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s [j] = '\0';
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printf ("The string entered is:\n");
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i = fputs (s, stdout);
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if (i)
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goto Fail8;
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printf ("\n");
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i = fputs (s, stderr);
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if (i)
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goto Fail9;
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printf ("\n");
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saveStdin = stdin;
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stdin = freopen (fn1, "r", f1); /* reassign standard in */
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if (stdin == NULL)
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goto Fail2;
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f3 = fopen (fn3, "w"); /* open stream to get new FILE ptr */
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if (f3 == NULL)
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goto Fail;
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saveStdout = stdout;
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stdout = freopen (fn3, "w", f3); /* reassign standard out */
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if (stdout == NULL)
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goto Fail2;
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saveStderr = stderr;
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f4 = fopen (fn4, "w"); /* open stream to get new FILE ptr */
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if (f4 == NULL)
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goto Fail;
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stderr = freopen (fn4, "w", f4); /* reassign standard error */
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if (stderr == NULL)
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goto Fail2;
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i = fscanf (stdin, "%s", s); /* read input string from file */
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if (i == EOF)
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goto Fail7;
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i = puts (s); /* write string to files */
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if (i)
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goto Fail8;
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i = fputs (s, stderr);
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if (i)
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goto Fail9;
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/* Now reset standard in, standard out, and standard error, and ensure */
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/* they're ok. */
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i = fclose (stdin); /* close disk files attached */
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if (i == EOF) /* to stdin, stdout, stderr */
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goto Fail4;
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i = fclose (stdout);
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if (i == EOF)
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goto Fail4;
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i = fclose (stderr);
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if (i == EOF)
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goto Fail4;
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stdin = saveStdin; /* reassign standard in */
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stdout = saveStdout; /* reassign standard out */
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stderr = saveStderr; /* reassign standard error */
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printf ("Please enter a string\n"); /* Prompt the tester to input */
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j = 0; /* a string & then check that*/
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while ((i = fgetc (stdin)) != '\n') /* it's written to stdout & */
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{ /* stderr */
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if (i == EOF)
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goto Fail7;
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s [j++] = i;
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}
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s [j] = '\0';
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printf ("The string entered is:\n");
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i = puts (s);
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if (i)
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goto Fail8;
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printf ("\n");
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i = fputs (s, stderr);
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if (i)
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goto Fail9;
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printf ("\n");
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printf ("Passed Special Conformance Test 17.2.0.3 ");
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return 0;
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Fail:
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perror ("File open failure in Special Conformance Test 17.2.0.3 ");
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exit (0);
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Fail2:
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printf ("Error when reopening stream\n");
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exit (0);
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Fail3:
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printf ("Error when writing file\n");
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exit (0);
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Fail4:
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printf ("Error when closing file\n");
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exit (0);
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Fail5:
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printf ("Error when seeking file\n");
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exit (0);
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Fail6:
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printf ("Error when appending to file\n");
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exit (0);
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Fail7:
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printf ("Error when reading from standard in\n");
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exit (0);
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Fail8:
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printf ("Error when writing to standard out\n");
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exit (0);
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Fail9:
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printf ("Error when writing to standard error out\n");
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exit (0);
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}
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