summaryrefslogtreecommitdiff
path: root/src/pal/tests/palsuite/c_runtime/fopen/test6/test6.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/pal/tests/palsuite/c_runtime/fopen/test6/test6.cpp')
-rw-r--r--src/pal/tests/palsuite/c_runtime/fopen/test6/test6.cpp131
1 files changed, 131 insertions, 0 deletions
diff --git a/src/pal/tests/palsuite/c_runtime/fopen/test6/test6.cpp b/src/pal/tests/palsuite/c_runtime/fopen/test6/test6.cpp
new file mode 100644
index 0000000..03b6067
--- /dev/null
+++ b/src/pal/tests/palsuite/c_runtime/fopen/test6/test6.cpp
@@ -0,0 +1,131 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+/*=====================================================================
+**
+** Source: test6.c
+**
+** Purpose: Tests the PAL implementation of the fopen function.
+** Test to ensure that you can write to an 'a' mode file.
+** And that you can't read from a 'a' mode file. Also ensure
+** that you can use fseek and still write to the end of a file.
+**
+** Depends:
+** fprintf
+** fgets
+** fseek
+** fclose
+**
+
+**
+**===================================================================*/
+
+#include <palsuite.h>
+
+int __cdecl main(int argc, char **argv)
+{
+
+ FILE *fp;
+ char buffer[128];
+
+ if (PAL_Initialize(argc, argv))
+ {
+ return FAIL;
+ }
+
+
+ /* Open a file with 'a+' mode */
+ if( (fp = fopen( "testfile", "a" )) == NULL )
+ {
+ Fail( "ERROR: The file failed to open with 'a' mode.\n" );
+ }
+
+ /* Write some text to the file */
+ if(fprintf(fp,"%s","some text") <= 0)
+ {
+ Fail("ERROR: Attempted to WRITE to a file opened with 'a' mode "
+ "but fprintf failed. Either fopen or fprintf have problems.");
+ }
+
+ if(fseek(fp, 0, SEEK_SET))
+ {
+ Fail("ERROR: fseek failed, and this test depends on it.");
+ }
+
+ /* Attempt to read from the 'a' only file, should fail */
+ if(fgets(buffer,10,fp) != NULL)
+ {
+ Fail("ERROR: Tried to READ from a file with 'a' mode set. "
+ "This should fail, but fgets returned success. Either fgets "
+ "or fopen is broken.");
+ }
+
+
+ /* Attempt to write to a file after using 'a' and fseek */
+ fp = fopen("testfile2", "a");
+ if(fp == NULL)
+ {
+ Fail("ERROR: The file failed to be created with 'a' mode.\n");
+ }
+
+ /* write text to the file initially */
+ if(fprintf(fp,"%s","abcd") <= 0)
+ {
+ Fail("ERROR: Attempted to WRITE to a file opened with 'a' mode "
+ "but fprintf failed. Either fopen or fprintf have problems.\n");
+ }
+
+ /* set the pointer to the front of the file */
+ if(fseek(fp, 0, SEEK_SET))
+ {
+ Fail("ERROR: fseek failed, and this test depends on it.\n");
+ }
+
+ /* using 'a' should still write to the end of the file, not the front */
+ if(fputs("efgh",fp) < 0)
+ {
+ Fail("ERROR: Attempted to WRITE to a file opened with 'a' mode "
+ "but fputs failed.\n");
+ }
+
+ /* set the pointer to the front of the file */
+ if(fseek(fp, 0, SEEK_SET))
+ {
+ Fail("ERROR: fseek failed, and this test depends on it.\n");
+ }
+
+ /* a file with 'a' mode can only write, so close the file before reading */
+ if(fclose(fp))
+ {
+ Fail("ERROR: fclose failed when it should have succeeded.\n");
+ }
+
+ /* open the file again to read */
+ fp = fopen("testfile2","r");
+ if(fp == NULL)
+ {
+ Fail("ERROR: fopen failed to open the file using 'r' mode");
+ }
+
+ /* Attempt to read from the 'a' only file, should succeed */
+ if(fgets(buffer,10,fp) == NULL)
+ {
+ Fail("ERROR: Tried to READ from a file with 'a' mode set. "
+ "This should pass, but fgets returned failure. Either fgets "
+ "or fopen is broken.\n");
+ }
+
+ /* Compare what was read and what should have been in the file */
+ if(memcmp(buffer,"abcdefgh",8))
+ {
+ Fail("ERROR: The string read should have equaled 'abcdefgh' "
+ "but instead it is %s\n", buffer);
+ }
+
+
+ PAL_Terminate();
+ return PASS;
+}
+
+