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-rw-r--r--lib/tiny-printf.c130
1 files changed, 130 insertions, 0 deletions
diff --git a/lib/tiny-printf.c b/lib/tiny-printf.c
new file mode 100644
index 0000000..403b134
--- /dev/null
+++ b/lib/tiny-printf.c
@@ -0,0 +1,130 @@
+/*
+ * Tiny printf version for SPL
+ *
+ * Copied from:
+ * http://www.sparetimelabs.com/printfrevisited/printfrevisited.php
+ *
+ * Copyright (C) 2004,2008 Kustaa Nyholm
+ *
+ * SPDX-License-Identifier: LGPL-2.1+
+ */
+
+#include <common.h>
+#include <stdarg.h>
+#include <serial.h>
+
+static char *bf;
+static char zs;
+
+static void out(char c)
+{
+ *bf++ = c;
+}
+
+static void out_dgt(char dgt)
+{
+ out(dgt + (dgt < 10 ? '0' : 'a' - 10));
+ zs = 1;
+}
+
+static void div_out(unsigned int *num, unsigned int div)
+{
+ unsigned char dgt = 0;
+
+ while (*num >= div) {
+ *num -= div;
+ dgt++;
+ }
+
+ if (zs || dgt > 0)
+ out_dgt(dgt);
+}
+
+int vprintf(const char *fmt, va_list va)
+{
+ char ch;
+ char *p;
+ unsigned int num;
+ char buf[12];
+ unsigned int div;
+
+ while ((ch = *(fmt++))) {
+ if (ch != '%') {
+ putc(ch);
+ } else {
+ char lz = 0;
+ char w = 0;
+
+ ch = *(fmt++);
+ if (ch == '0') {
+ ch = *(fmt++);
+ lz = 1;
+ }
+
+ if (ch >= '0' && ch <= '9') {
+ w = 0;
+ while (ch >= '0' && ch <= '9') {
+ w = (w * 10) + ch - '0';
+ ch = *fmt++;
+ }
+ }
+ bf = buf;
+ p = bf;
+ zs = 0;
+
+ switch (ch) {
+ case 0:
+ goto abort;
+ case 'u':
+ case 'd':
+ num = va_arg(va, unsigned int);
+ if (ch == 'd' && (int)num < 0) {
+ num = -(int)num;
+ out('-');
+ }
+ for (div = 1000000000; div; div /= 10)
+ div_out(&num, div);
+ break;
+ case 'x':
+ num = va_arg(va, unsigned int);
+ for (div = 0x10000000; div; div /= 0x10)
+ div_out(&num, div);
+ break;
+ case 'c':
+ out((char)(va_arg(va, int)));
+ break;
+ case 's':
+ p = va_arg(va, char*);
+ break;
+ case '%':
+ out('%');
+ default:
+ break;
+ }
+
+ *bf = 0;
+ bf = p;
+ while (*bf++ && w > 0)
+ w--;
+ while (w-- > 0)
+ putc(lz ? '0' : ' ');
+ while ((ch = *p++))
+ putc(ch);
+ }
+ }
+
+abort:
+ return 0;
+}
+
+int printf(const char *fmt, ...)
+{
+ va_list va;
+ int ret;
+
+ va_start(va, fmt);
+ ret = vprintf(fmt, va);
+ va_end(va);
+
+ return ret;
+}