newlib-2.4.0

git-svn-id: svn://kolibrios.org@6536 a494cfbc-eb01-0410-851d-a64ba20cac60

contrib/sdk/sources/newlib/libc/stdlib/utoa.c

@@ -0,0 +1,76 @@
+/*
+FUNCTION
+<<utoa>>---unsigned integer to string
+
+INDEX
+	utoa
+
+ANSI_SYNOPSIS
+	#include <stdlib.h>
+	char *utoa(unsigned <[value]>, char *<[str]>, int <[base]>);
+	char *__utoa(unsigned <[value]>, char *<[str]>, int <[base]>);
+
+DESCRIPTION
+<<utoa>> converts the unsigned integer [<value>] to a null-terminated string
+using the specified base, which must be between 2 and 36, inclusive.
+<[str]> should be an array long enough to contain the converted
+value, which in the worst case is sizeof(int)*8+1 bytes. 
+
+RETURNS
+A pointer to the string, <[str]>, or NULL if <[base]> is invalid.
+
+PORTABILITY
+<<utoa>> is non-ANSI.
+
+No supporting OS subroutine calls are required.
+*/
+
+#include <stdlib.h>
+
+char *
+_DEFUN (__utoa, (value, str, base),
+        unsigned value _AND
+        char *str _AND 
+        int base)
+{
+  const char digits[] = "0123456789abcdefghijklmnopqrstuvwxyz";
+  int i, j;
+  unsigned remainder;
+  char c;
+  
+  /* Check base is supported. */
+  if ((base < 2) || (base > 36))
+    { 
+      str[0] = '\0';
+      return NULL;
+    }  
+    
+  /* Convert to string. Digits are in reverse order.  */
+  i = 0;
+  do 
+    {
+      remainder = value % base;
+      str[i++] = digits[remainder];
+      value = value / base;
+    } while (value != 0);  
+  str[i] = '\0'; 
+  
+  /* Reverse string.  */
+  for (j = 0, i--; j < i; j++, i--)
+    {
+      c = str[j];
+      str[j] = str[i];
+      str[i] = c; 
+    }       
+  
+  return str;
+}
+
+char *  
+_DEFUN (utoa, (value, str, base),
+        unsigned value _AND
+        char *str _AND
+        int base)
+{
+  return __utoa (value, str, base);
+}