more bpmpfw shenanigans

Source/hoc-clk/bpmpfw/source/libc/src/fslc_strspn.c

@@ -0,0 +1,18 @@
+#include "fslc_string.h"
+
+size_t fslc_strspn(const char *str, const char *delim)
+{
+    size_t r;
+
+    for (r = 0; *str; ++str, ++r)
+    {
+        const char *d;
+        for (d = delim; *d; ++d)
+            if (*str == *d) // skip to next if found
+                break;
+
+        if (*d == 0) // inner loop exited on \0 - char was not there
+            break;
+    }
+    return r;
+}