Remove a file test outside of the specs and improve CI reporting (#2057)

Remove the test in the sample of file interaction that tries to extend the file
at the end, because this is not supported by the specifications of fseek.
The WASI exit code is now propagated by the runtime, so the CI will
indicate when a test is failing.

samples/file/src/main.c

@@ -20,7 +20,7 @@ main(int argc, char *argv_main[])
     static char global_heap_buf[512 * 1024];
     char *buffer, error_buf[128];
     const char *wasm_path = NULL, *wasi_dir = NULL;
-    int opt;
+    int opt, main_result = 1;
 
     wasm_module_t module = NULL;
     wasm_module_inst_t module_inst = NULL;
@@ -91,7 +91,7 @@ main(int argc, char *argv_main[])
     }
 
     if (wasm_application_execute_main(module_inst, 0, NULL)) {
-        printf("Main wasm function successfully finished.\n");
+        main_result = wasm_runtime_get_wasi_exit_code(module_inst);
     }
     else {
         printf("call wasm function main failed. error: %s\n",
@@ -109,5 +109,5 @@ fail:
     if (buffer)
         BH_FREE(buffer);
     wasm_runtime_destroy();
-    return 0;
+    return main_result;
 }

samples/file/wasm-app/main.c

@@ -99,8 +99,32 @@ main(int argc, char **argv)
     assert(ftell(file) == strlen(FILE_TEXT));
     printf("[Test] Reading at specified offset passed.\n");
 
+    // Test: moving at the start of the file (fseek)
+    printf("Move at the start of the file (fseek)..\n");
+    printf("File current offset: %ld\n", ftell(file));
+    fseek(file, 0, SEEK_SET);
+    printf("File current offset: %ld\n", ftell(file));
+    assert(ftell(file) == 0);
+
+    // Test: moving at the end of the file (fseek)
+    printf("Move at the end of the file (fseek)..\n");
+    printf("File current offset: %ld\n", ftell(file));
+    fseek(file, 0, SEEK_END);
+    printf("File current offset: %ld\n", ftell(file));
+    assert(ftell(file) == strlen(FILE_TEXT));
+    int end_position = ftell(file) / 2;
+
+    // Test: moving at the middle of the file (fseek)
+    printf("Move at the middle of the file (fseek)..\n");
+    printf("File current offset: %ld\n", ftell(file));
+    fseek(file, 0, SEEK_SET);
+    fseek(file, end_position, SEEK_CUR);
+    printf("File current offset: %ld\n", ftell(file));
+    assert(ftell(file) == end_position);
+
     // Test: allocate more space to the file (posix_fallocate)
     printf("Allocate more space to the file (posix_fallocate)..\n");
+    fseek(file, 0, SEEK_END);
     posix_fallocate(fileno(file), ftell(file), ADDITIONAL_SPACE);
     printf("File current offset: %ld\n", ftell(file));
     printf("Moving to the end..\n");
@@ -120,7 +144,7 @@ main(int argc, char **argv)
     assert(ftell(file) == strlen(text) + 2 * ADDITIONAL_SPACE);
     printf("[Test] Extension of the file size passed.\n");
 
-    // Test: allocate more space to the file (fseek)
+    // Test: allocate more space to the file (fseek, from the start)
     printf("Allocate more space to the file (fseek) from the start..\n");
     printf("File current offset: %ld\n", ftell(file));
     fseek(file, 3 * ADDITIONAL_SPACE, SEEK_SET);
@@ -128,15 +152,7 @@ main(int argc, char **argv)
     assert(ftell(file) == 3 * ADDITIONAL_SPACE);
     printf("[Test] Extension of the file size passed.\n");
 
-    // Test: allocate more space to the file (fseek)
-    printf("Allocate more space to the file (fseek) from the end..\n");
-    printf("File current offset: %ld\n", ftell(file));
-    fseek(file, ADDITIONAL_SPACE, SEEK_END);
-    printf("File current offset: %ld\n", ftell(file));
-    assert(ftell(file) == 4 * ADDITIONAL_SPACE);
-    printf("[Test] Extension of the file size passed.\n");
-
-    // Test: allocate more space to the file (fseek)
+    // Test: allocate more space to the file (fseek, from the middle)
     printf("Allocate more space to the file (fseek) from the middle..\n");
     fseek(file, 3 * ADDITIONAL_SPACE, SEEK_SET);
     printf("File current offset: %ld\n", ftell(file));