X-Git-Url: https://pd.if.org/git/?p=pdclib;a=blobdiff_plain;f=functions%2Fstdio%2Fvsnprintf.c;h=761853ff8f627e38a7766e4b79184887f0b666ac;hp=df104ecab5cc10b123aac9fdf085679230a9122d;hb=da0f3f353d417fed71f358a48d5d5394145e460d;hpb=34893ecc2200dc7017c36a54cb6c5f4c2378b5ec

diff --git a/functions/stdio/vsnprintf.c b/functions/stdio/vsnprintf.c
index df104ec..761853f 100644
--- a/functions/stdio/vsnprintf.c
+++ b/functions/stdio/vsnprintf.c
@@ -1,8 +1,73 @@
-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// 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 */ };
+/* vsnprintf( char *, size_t, 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>
+
+#ifndef REGTEST
+#include "_PDCLIB_io.h"
+#include <string.h>
+
+struct state {
+    size_t bufrem;
+    char *bufp;
+};
+
+static size_t strout( void *p, const char *buf, size_t sz )
+{
+    struct state *s = p;
+    size_t copy = s->bufrem >= sz ? sz : s->bufrem;
+    memcpy( s->bufp, buf, copy );
+    s->bufrem -= copy;
+    s->bufp   += copy;
+    return sz;
+}
+
+int vsnprintf( char * _PDCLIB_restrict s,
+               size_t n,
+               const char * _PDCLIB_restrict format,
+               _PDCLIB_va_list arg )
+{
+    struct state st;
+    st.bufrem = n;
+    st.bufp   = s;
+    int r = _vcbprintf( &st, strout, format, arg );
+    if ( st.bufrem )
+    {
+        *st.bufp = 0;
+    }
+
+    return r;
+}
+
+#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
+