X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fstdio%2Fvsnprintf.c;h=a8f568469cd101a713f6a660b9151a2c928893d6;hb=e1c526e9bad3f6e69391e94059096145390508d3;hp=08f235530a68a8b843e53c06422bef19146b746a;hpb=b17766ea03cd21332261ff57d69076ecb19523dc;p=pdclib

diff --git a/functions/stdio/vsnprintf.c b/functions/stdio/vsnprintf.c
index 08f2355..a8f5684 100644
--- a/functions/stdio/vsnprintf.c
+++ b/functions/stdio/vsnprintf.c
@@ -1,5 +1,3 @@
-/* $Id$ */
-
 /* vsnprintf( char *, size_t, const char *, va_list ap )
 
    This file is part of the Public Domain C Library (PDCLib).
@@ -10,23 +8,66 @@
 #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 * str, size_t size, const char * format, _PDCLIB_va_list arg )
+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. */
-    /* TODO: Implement */
-    return 0;
+    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 )
 {
-    TESTCASE( NO_TESTDRIVER );
+    char target[100];
+#include "printf_testcases.h"
     return TEST_RESULTS;
 }
 
 #endif
+