X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fwchar%2Fwcstok.c;fp=functions%2Fwchar%2Fwcstok.c;h=62f8dd8764d47af8fe36a5a8317e984b609914f1;hb=14b5b78e19a79f590233caee7848e7cb19084088;hp=0000000000000000000000000000000000000000;hpb=41777e3d5dc655f59a8c3bcd071639e6878e853a;p=pdclib

diff --git a/functions/wchar/wcstok.c b/functions/wchar/wcstok.c
new file mode 100644
index 0000000..62f8dd8
--- /dev/null
+++ b/functions/wchar/wcstok.c
@@ -0,0 +1,109 @@
+/* wcstok( wchar_t *, const wchar_t * )
+
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <wchar.h>
+
+#ifndef REGTEST
+
+wchar_t * wcstok( wchar_t * _PDCLIB_restrict s1, 
+                  const wchar_t * _PDCLIB_restrict s2,
+                  wchar_t ** _PDCLIB_restrict ptr )
+{
+    const wchar_t * p = s2;
+
+    if ( s1 != NULL )
+    {
+        /* new string */
+        *ptr = s1;
+    }
+    else
+    {
+        /* old string continued */
+        if ( *ptr == NULL )
+        {
+            /* No old string, no new string, nothing to do */
+            return NULL;
+        }
+        s1 = *ptr;
+    }
+
+    /* skipping leading s2 characters */
+    while ( *p && *s1 )
+    {
+        if ( *s1 == *p )
+        {
+            /* found seperator; skip and start over */
+            ++s1;
+            p = s2;
+            continue;
+        }
+        ++p;
+    }
+
+    if ( ! *s1 )
+    {
+        /* no more to parse */
+        return ( *ptr = NULL );
+    }
+
+    /* skipping non-s2 characters */
+    *ptr = s1;
+    while ( **ptr )
+    {
+        p = s2;
+        while ( *p )
+        {
+            if ( **ptr == *p++ )
+            {
+                /* found seperator; overwrite with '\0', position *ptr, return */
+                *(*ptr)++ = L'\0';
+                return s1;
+            }
+        }
+        ++(*ptr);
+    }
+
+    /* parsed to end of string */
+    *ptr = NULL;
+    return s1;
+}
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+    wchar_t s[] = L"_a_bc__d_";
+    wchar_t* state  = NULL;
+    wchar_t* tokres;
+
+    TESTCASE( ( tokres = wcstok( s, L"_", &state ) ) == &s[1] );
+    TESTCASE( s[1] == L'a' );
+    TESTCASE( s[2] == L'\0' );
+    TESTCASE( ( tokres = wcstok( NULL, L"_", &state ) ) == &s[3] );
+    TESTCASE( s[3] == L'b' );
+    TESTCASE( s[4] == L'c' );
+    TESTCASE( s[5] == L'\0' );
+    TESTCASE( ( tokres = wcstok( NULL, L"_", &state ) ) == &s[7] );
+    TESTCASE( s[6] == L'_' );
+    TESTCASE( s[7] == L'd' );
+    TESTCASE( s[8] == L'\0' );
+    TESTCASE( ( tokres = wcstok( NULL, L"_", &state ) ) == NULL );
+    wcscpy( s, L"ab_cd" );
+    TESTCASE( ( tokres = wcstok( s, L"_", &state ) ) == &s[0] );
+    TESTCASE( s[0] == L'a' );
+    TESTCASE( s[1] == L'b' );
+    TESTCASE( s[2] == L'\0' );
+    TESTCASE( ( tokres = wcstok( NULL, L"_", &state ) ) == &s[3] );
+    TESTCASE( s[3] == L'c' );
+    TESTCASE( s[4] == L'd' );
+    TESTCASE( s[5] == L'\0' );
+    TESTCASE( ( tokres = wcstok( NULL, L"_", &state ) ) == NULL );
+    return TEST_RESULTS;
+}
+#endif