tiny-printf: Support snprintf()

Add a simple version of this function for SPL. It does not check the buffer
size as this would add to the code size.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Stefan Roese <sr@denx.de>

diff --git a/lib/tiny-printf.c b/lib/tiny-printf.c
index fbd5368c0b35b9152315437d07fc16c92e4895c7..4b70263df7d73992c2a858205f45370d31f7056a 100644 (file)
--- a/lib/tiny-printf.c
+++ b/lib/tiny-printf.c
@@ -16,6 +16,9 @@
 static char *bf;
 static char zs;
 
+/* Current position in sprintf() output string */
+static char *outstr;
+
 static void out(char c)
 {
        *bf++ = c;
@@ -40,7 +43,7 @@ static void div_out(unsigned int *num, unsigned int div)
                out_dgt(dgt);
 }
 
-int vprintf(const char *fmt, va_list va)
+int _vprintf(const char *fmt, va_list va, void (*putc)(const char ch))
 {
        char ch;
        char *p;
@@ -133,8 +136,28 @@ int printf(const char *fmt, ...)
        int ret;
 
        va_start(va, fmt);
-       ret = vprintf(fmt, va);
+       ret = _vprintf(fmt, va, putc);
+       va_end(va);
+
+       return ret;
+}
+
+static void putc_outstr(char ch)
+{
+       *outstr++ = ch;
+}
+
+/* Note that size is ignored */
+int snprintf(char *buf, size_t size, const char *fmt, ...)
+{
+       va_list va;
+       int ret;
+
+       va_start(va, fmt);
+       outstr = buf;
+       ret = _vprintf(fmt, va, putc_outstr);
        va_end(va);
+       *outstr = '\0';
 
        return ret;
 }