[sanitizer_common] Add tests for more *putc and *getc variants

[mgorny]

Summary

Add tests for the more character-oriented functions, that is:

• fputc(), putc() and putchar()
• getc_unlocked()
• putc_unlocked() and putchar_unlocked()

[krytarowski]

Are all the functions available for FreeBSD, NetBSD, Linux, Android, Solaris an Darwin?

I would include a test for getchar_unlocked() anyway, even if it's an alias in most/all implementations.

[krytarowski]

Does this depend on D56109?

It looks like we shall install interceptors for a lot of routines that are FILE* users.

[mgorny]

In D56152#1342331, @krytarowski wrote:

Are all the functions available for FreeBSD, NetBSD, Linux, Android, Solaris an Darwin?

I don't know. I suppose the easiest way to check would be to commit it and see what happens. Then address the fallout.

I would include a test for getchar_unlocked() anyway, even if it's an alias in most/all implementations.

I suppose I could do that but I'd have to pipe some data into the stdin.

[krytarowski]

In D56152#1342372, @mgorny wrote:

In D56152#1342331, @krytarowski wrote:

Are all the functions available for FreeBSD, NetBSD, Linux, Android, Solaris an Darwin?

I don't know. I suppose the easiest way to check would be to commit it and see what happens. Then address the fallout.

I would include a test for getchar_unlocked() anyway, even if it's an alias in most/all implementations.

I suppose I could do that but I'd have to pipe some data into the stdin.

OK, so let's do it in another test.

Please drop its mention in description.

[mgorny]

Updated description.

compiler-rt/trunk/test/sanitizer_common/TestCases/Posix/fputc_putc_putchar.cc

+// RUN: %clangxx -g %s -o %t && %run %t | FileCheck %s
+// CHECK: abc
+
+#include <assert.h>
+#include <stdio.h>
+
+int main(void) {
+  assert(fputc('a', stdout) != EOF);
+  assert(putc('b', stdout) != EOF);
+  assert(putchar('c') != EOF);
+
+  return 0;
+}

compiler-rt/trunk/test/sanitizer_common/TestCases/Posix/getc_unlocked.cc

+// RUN: %clangxx -g %s -o %t && %run %t
+
+#include <assert.h>
+#include <stdio.h>
+
+int main(int argc, char **argv) {
+  FILE *fp = fopen(argv[0], "r");
+  assert(fp);
+
+  // the file should be at least one character long, always
+  assert(getc_unlocked(fp) != EOF);
+  // POSIX guarantees being able to ungetc() at least one character
+  // NB: ungetc_unlocked is apparently not present
+  assert(ungetc('X', fp) != EOF);
+  // check whether ungetc() works with getc_unlocked()
+  assert(getc_unlocked(fp) == 'X');
+
+  assert(!fclose(fp));
+  return 0;
+}

compiler-rt/trunk/test/sanitizer_common/TestCases/Posix/putc_putchar_unlocked.cc

+// RUN: %clangxx -g %s -o %t && %run %t | FileCheck %s
+// CHECK: bc
+
+#include <assert.h>
+#include <stdio.h>
+
+int main(void) {
+  assert(putc_unlocked('b', stdout) != EOF);
+  assert(putchar_unlocked('c') != EOF);
+
+  return 0;
+}