PDCLIB-20 #resolve Add support for "unusual" cases. Ammend test suite to verify support.

[pdclib] / functions / stdio / vsnprintf.c

diff --git a/functions/stdio/vsnprintf.c b/functions/stdio/vsnprintf.c
index 6fae08075c8840da65fc55f8972e8d97f16ab8cd..cda7ab6579d4f45ef9d47580fb5ef540e070d094 100644 (file)
--- a/functions/stdio/vsnprintf.c
+++ b/functions/stdio/vsnprintf.c
@@ -1,8 +1,87 @@
-/* ----------------------------------------------------------------------------
- * $Id$
- * ----------------------------------------------------------------------------
- * Public Domain C Library - http://pdclib.sourceforge.net
- * This code is Public Domain. Use, modify, and redistribute at will.
- * --------------------------------------------------------------------------*/
-
-int vsnprintf( char * restrict s, size_t n, const char * restrict format, va_list ap ) { /* TODO */ };
+/* $Id$ */
+
+/* vsnprintf( char *, size_t, const char *, va_list ap )
+
+   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>
+
+#ifndef REGTEST
+#include <_PDCLIB_io.h>
+
+int vsnprintf( char * _PDCLIB_restrict s, 
+               size_t n, 
+               const char * _PDCLIB_restrict format, 
+               _PDCLIB_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 = n;
+    status.i = 0;
+    status.current = 0;
+    status.s = s;
+    status.width = 0;
+    status.prec = 0;
+    status.stream = NULL;
+    va_copy( status.arg, arg );
+
+    while ( *format != '\0' )
+    {
+        const char * rc;
+        if ( ( *format != '%' ) || ( ( rc = _PDCLIB_print( format, &status ) ) == format ) )
+        {
+            /* No conversion specifier, print verbatim */
+            if ( status.i < n )
+            {
+                s[ status.i ] = *format;
+            }
+            status.i++;
+            format++;
+        }
+        else
+        {
+            /* Continue parsing after conversion specifier */
+            format = rc;
+        }
+    }
+    if ( status.i  < n )
+    {
+        s[ status.i ] = '\0';
+    }
+    va_end( status.arg );
+    return status.i;
+}
+
+#endif
+
+#ifdef TEST
+#define _PDCLIB_FILEID "stdio/vsnprintf.c"
+#define _PDCLIB_STRINGIO
+#include <stdint.h>
+#include <stddef.h>
+#include <_PDCLIB_test.h>
+
+static int testprintf( char * s, const char * format, ... )
+{
+    int i;
+    va_list arg;
+    va_start( arg, format );
+    i = vsnprintf( s, 100, format, arg );
+    va_end( arg );
+    return i;
+}
+
+int main( void )
+{
+    char target[100];
+#include "printf_testcases.h"
+    return TEST_RESULTS;
+}
+
+#endif
+