Add new string tests

SingleSource/UnitTests/strcspn.c

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+// Copyright 2024 LLVM-MOS
+//
+// Licensed under the Apache License, Version 2.0 with LLVM Exceptions,
+// See https://github.com/llvm-mos/llvm-mos-sdk/blob/main/LICENSE for license
+// information.
+
+#undef NDEBUG
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+
+// Originally from the Public Domain C Library (PDCLib)
+
+static const char abcde[] = "abcde";
+static const char abcdx[] = "abcdx";
+
+int main(void) {
+  assert(strcspn(abcde, "x") == 5);
+  assert(strcspn(abcde, "xyz") == 5);
+  assert(strcspn(abcde, "zyx") == 5);
+  assert(strcspn(abcdx, "x") == 4);
+  assert(strcspn(abcdx, "xyz") == 4);
+  assert(strcspn(abcdx, "zyx") == 4);
+  assert(strcspn(abcde, "a") == 0);
+  assert(strcspn(abcde, "abc") == 0);
+  assert(strcspn(abcde, "cba") == 0);
+  return 0;
+}

SingleSource/UnitTests/strcspn.reference_output

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+exit 0

SingleSource/UnitTests/strspn.c

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+// Copyright 2024 LLVM-MOS
+//
+// Licensed under the Apache License, Version 2.0 with LLVM Exceptions,
+// See https://github.com/llvm-mos/llvm-mos-sdk/blob/main/LICENSE for license
+// information.
+
+#undef NDEBUG
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+
+// Originally from the Public Domain C Library (PDCLib)
+
+static const char abcde[] = "abcde";
+
+int main(void) {
+  assert(strspn(abcde, "abc") == 3);
+  assert(strspn(abcde, "b") == 0);
+  assert(strspn(abcde, abcde) == 5);
+  return 0;
+}

SingleSource/UnitTests/strspn.reference_output

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+exit 0

SingleSource/UnitTests/strstr.c

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+// Copyright 2024 LLVM-MOS
+//
+// Licensed under the Apache License, Version 2.0 with LLVM Exceptions,
+// See https://github.com/llvm-mos/llvm-mos-sdk/blob/main/LICENSE for license
+// information.
+
+#undef NDEBUG
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+
+// Originally from the Public Domain C Library (PDCLib)
+
+int main(void) {
+  char s[] = "abcabcabcdabcde";
+  assert(strstr(s, "x") == NULL);
+  assert(strstr(s, "xyz") == NULL);
+  assert(strstr(s, "a") == &s[0]);
+  assert(strstr(s, "abc") == &s[0]);
+  assert(strstr(s, "abcd") == &s[6]);
+  assert(strstr(s, "abcde") == &s[10]);
+  return 0;
+}

SingleSource/UnitTests/strstr.reference_output

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+exit 0