1 files changed, 109 insertions, 0 deletions
diff --git a/src/pdclib/functions/stdio/vsscanf.c b/src/pdclib/functions/stdio/vsscanf.c
new file mode 100644
index 0000000..e76e70e
--- /dev/null
+++ b/src/pdclib/functions/stdio/vsscanf.c
@@ -0,0 +1,109 @@
+/* vsscanf( const char *, const char *, va_list )
+
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <ctype.h>
+
+#ifndef REGTEST
+
+int vsscanf( const char * _PDCLIB_restrict s, const char * _PDCLIB_restrict format, va_list arg )
+{
+    /* TODO: This function should interpret format as multibyte characters.  */
+    struct _PDCLIB_status_t status;
+    status.base = 0;
+    status.flags = 0;
+    status.n = 0;
+    status.i = 0;
+    status.current = 0;
+    status.s = (char *) s;
+    status.width = 0;
+    status.prec = EOF;
+    status.stream = NULL;
+    va_copy( status.arg, arg );
+
+    while ( *format != '\0' )
+    {
+        const char * rc;
+        if ( ( *format != '%' ) || ( ( rc = _PDCLIB_scan( format, &status ) ) == format ) )
+        {
+            /* No conversion specifier, match verbatim */
+            if ( isspace( *format ) )
+            {
+                /* Whitespace char in format string: Skip all whitespaces */
+                /* No whitespaces in input do not result in matching error */
+                while ( isspace( *status.s ) )
+                {
+                    ++status.s;
+                    ++status.i;
+                }
+            }
+            else
+            {
+                /* Non-whitespace char in format string: Match verbatim */
+                if ( *status.s != *format )
+                {
+                    if ( *status.s == '\0' && status.n == 0 )
+                    {
+                        /* Early input error */
+                        return EOF;
+                    }
+                    /* Matching error */
+                    return status.n;
+                }
+                else
+                {
+                    ++status.s;
+                    ++status.i;
+                }
+            }
+            ++format;
+        }
+        else
+        {
+            /* NULL return code indicates error */
+            if ( rc == NULL )
+            {
+                if ( ( *status.s == '\n' ) && ( status.n == 0 ) )
+                {
+                    status.n = EOF;
+                }
+                break;
+            }
+            /* Continue parsing after conversion specifier */
+            format = rc;
+        }
+    }
+    va_end( status.arg );
+    return status.n;
+}
+
+#endif
+
+#ifdef TEST
+#define _PDCLIB_FILEID "stdio/vsscanf.c"
+#define _PDCLIB_STRINGIO
+
+#include "_PDCLIB_test.h"
+
+static int testscanf( const char * stream, const char * format, ... )
+{
+    va_list ap;
+    int result;
+    va_start( ap, format );
+    result = vsscanf( stream, format, ap );
+    va_end( ap );
+    return result;
+}
+
+int main( void )
+{
+    char source[100];
+#include "scanf_testcases.h"
+    return TEST_RESULTS;
+}
+
+#endif