/* Conformance Test 17.6.0.1: Verification of fgetc, getc, and ungetc with */ /* a text stream */ #include int main (void) { FILE *f1; int i, j; char ch; f1 = fopen ("3/tmp", "w+"); /* create text file to work on */ if (f1 == NULL) goto Fail1; for (ch = 'a', i = 0; i < 26; i++) { j = fputc (ch, f1); if ((char) j != ch) goto Fail2; ch++; } j = fputc ('\r', f1); /* text files end with return */ if (j != '\r') goto Fail2; rewind (f1); /* check file contents with fgetc */ for (ch = 'a', i = 0; i < 26; i++) { j = fgetc (f1); if ( (char) j != ch++ ) goto Fail; } i = ungetc ('F', f1); /* test ungetc */ if (i != 'F') goto Fail; i = fgetc (f1); if (i != 'F') goto Fail; i = fgetc (f1); if (i != '\n') goto Fail; i = fgetc (f1); if (! (feof (f1)) ) /* ensure end-of-file reached */ goto Fail; j = ungetc (i, f1); /* not an error to try to push */ if (j != EOF) /* back EOF */ goto Fail; j = fseek (f1, 0L, SEEK_SET); /* test getc with temp file */ if (j) goto Fail3; j = ungetc (i, f1); /* ungetc should return an error */ if (j != EOF) /* after seeking on the file */ goto Fail; /* before reading */ for (ch = 'a', i = 0; i < 26; i++) { j = getc (f1); if ( (char) j != ch++ ) goto Fail; } i = ungetc ('L', f1); /* test ungetc */ if (i != 'L') goto Fail; i = fgetc (f1); if (i != 'L') goto Fail; i = getc (f1); if (i != '\n') goto Fail; i = getc (f1); if (! (feof (f1)) ) /* ensure end-of-file reached */ goto Fail; j = ungetc (i, f1); /* not an error to try to push */ if (j != EOF) /* back EOF */ goto Fail; i = fclose (f1); /* close the file and quit */ if (i == EOF) goto Fail4; printf ("Passed Conformance Test 17.6.0.1\n"); return 0; Fail: printf ("Failed Conformance Test 17.6.0.1\n"); return 0; Fail1: printf ("Unable to open temp file for Conformance Test 17.6.0.1\n"); return 0; Fail2: printf ("Unable to write to temp file for Conformance Test 17.6.0.1\n"); return 0; Fail3: printf ("Unable to seek to temp file for Conformance Test 17.6.0.1\n"); return 0; Fail4: printf ("Unable to close temp file for Conformance Test 17.6.0.1\n"); return 0; }