integrate dietlibc/stdio per default for cdrom and disk only installs

1 files changed, 82 insertions, 0 deletions

diff --git a/mdk-stage1/dietlibc/lib/__dtostr.c b/mdk-stage1/dietlibc/lib/__dtostr.c
new file mode 100644
index 000000000..def091f16
--- /dev/null
+++ b/mdk-stage1/dietlibc/lib/__dtostr.c
@@ -0,0 +1,82 @@
+/* convert double to string.  Helper for sprintf. */
+
+int __dtostr(double d,char *buf,int maxlen,int prec) {
+  unsigned long long *x=(unsigned long long *)&d;
+  /* step 1: extract sign, mantissa and exponent */
+  signed int s=*x>>63;
+  signed long e=((*x>>52)&((1<<11)-1))-1023;
+/*  unsigned long long m=*x & ((1ull<<52)-1); */
+  /* step 2: exponent is base 2, compute exponent for base 10 */
+  signed long e10=1+(long)(e*0.30102999566398119802); /* log10(2) */
+  /* step 3: calculate 10^e10 */
+  int i;
+  double tmp=10.0;
+  char *oldbuf=buf;
+  int initial=1;
+
+  if (s) { d=-d; *buf='-'; --maxlen; buf++; }
+  if ((i=e10)>=0) {
+    while (i>10) { tmp=tmp*1e10; i-=10; }
+    while (i>1) { tmp=tmp*10; --i; }
+  } else {
+    i=(e10=-e10);
+    while (i>10) { tmp=tmp*1e-10; i-=10; }
+    while (i>1) { tmp=tmp/10; --i; }
+  }
+  while (d/tmp<1) {
+    --e10;
+    tmp/=10.0;
+  }
+  /* step 4: see if precision is sufficient to display all digits */
+  if (e10>prec) {
+    /* use scientific notation */
+    int len=__dtostr(d/tmp,buf,maxlen,prec);
+    if (len==0) return 0;
+    maxlen-=len; buf+=len;
+    if (--maxlen>=0) {
+      *buf='e';
+      ++buf;
+    }
+    for (len=1000; len>0; len/=10) {
+      if (e10>=len || !initial) {
+	if (--maxlen>=0) {
+	  *buf=(e10/len)+'0';
+	  ++buf;
+	}
+	initial=0;
+	e10=e10%len;
+      }
+    }
+    if (maxlen>=0) return buf-oldbuf;
+    return 0;
+  }
+  /* step 5: loop through the digits, inserting the decimal point when
+   * appropriate */
+  for (; prec>0; ) {
+    double tmp2=d/tmp;
+    char c;
+    d-=((int)tmp2*tmp);
+    c=((int)tmp2);
+    if ((!initial)||c) {
+      if (--maxlen>=0) {
+	initial=0;
+	*buf=c+'0';
+	++buf;
+      } else
+	return 0;
+      --prec;
+    }
+    if (tmp>0.5 && tmp<1.5) {
+      tmp=1e-1;
+      initial=0;
+      if (--maxlen>=0) {
+	*buf='.';
+	++buf;
+      } else
+	return 0;
+    } else
+      tmp/=10.0;
+  }
+  *buf=0;
+  return buf-oldbuf;
+}