newlib-2.4.0

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

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

@@ -0,0 +1,69 @@
+/*
+FUNCTION
+<<itoa>>---integer to string
+
+INDEX
+	itoa
+
+ANSI_SYNOPSIS
+	#include <stdlib.h>
+	char *itoa(int <[value]>, char *<[str]>, int <[base]>);
+	char *__itoa(int <[value]>, char *<[str]>, int <[base]>);
+
+DESCRIPTION
+<<itoa>> converts the integer <[value]> to a null-terminated string
+using the specified base, which must be between 2 and 36, inclusive.
+If <[base]> is 10, <[value]> is treated as signed and the string will be 
+prefixed with '-' if negative. For all other bases, <[value]> is treated as
+unsigned. <[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
+<<itoa>> is non-ANSI.
+
+No supporting OS subroutine calls are required.
+*/
+
+#include <stdlib.h>
+
+char *
+_DEFUN (__itoa, (value, str, base),
+        int value _AND
+        char *str _AND 
+        int base)
+{
+  unsigned uvalue;
+  int i = 0;
+  
+  /* Check base is supported. */
+  if ((base < 2) || (base > 36))
+    { 
+      str[0] = '\0';
+      return NULL;
+    }  
+    
+  /* Negative numbers are only supported for decimal.
+   * Cast to unsigned to avoid overflow for maximum negative value.  */ 
+  if ((base == 10) && (value < 0))
+    {              
+      str[i++] = '-';
+      uvalue = (unsigned)-value;
+    }
+  else
+    uvalue = (unsigned)value;
+  
+  __utoa (uvalue, &str[i], base);
+  return str;
+}
+
+char *  
+_DEFUN (itoa, (value, str, base),
+        int value _AND
+        char *str _AND
+        int base)
+{
+  return __itoa (value, str, base);
+}