WIP - mpaland#109, mpaland#110

printf.c

@@ -231,6 +231,7 @@ static size_t _ntoa_format(out_fct_type out, char* buffer, size_t idx, size_t ma
 {
   // pad leading zeros
   if (!(flags & FLAGS_LEFT)) {
+  	size_t initial_len = len;
     if (width && (flags & FLAGS_ZEROPAD) && (negative || (flags & (FLAGS_PLUS | FLAGS_SPACE)))) {
       width--;
     }
@@ -240,6 +241,12 @@ static size_t _ntoa_format(out_fct_type out, char* buffer, size_t idx, size_t ma
     while ((flags & FLAGS_ZEROPAD) && (len < width) && (len < PRINTF_NTOA_BUFFER_SIZE)) {
       buf[len++] = '0';
     }
+    if (base == 8U && (flags & FLAGS_HASH)) {
+    	if (len > initial_len) {
+    		// Since we've written some zeros, we've satisfied the alternative format leading space requirement
+    		flags &= ~FLAGS_HASH;
+    	}
+    }
   }
 
   // handle hash
@@ -286,13 +293,18 @@ static size_t _ntoa_long(out_fct_type out, char* buffer, size_t idx, size_t maxl
   char buf[PRINTF_NTOA_BUFFER_SIZE];
   size_t len = 0U;
 
-  // no hash for 0 values
   if (!value) {
+  	if (!(flags & FLAGS_PRECISION)
+  	 || (base == 8U && (flags & ~FLAGS_HASH))
+  	) {
+  		buf[len++] = '0';
+  	}
     flags &= ~FLAGS_HASH;
+  		// We drop this flag this since either the alternative and regular modes of the specifier
+  		// don't differ on 0 values, or (in the case of octal) we've already provided the special
+  		// handling for this mode.
   }
-
-  // write if precision != 0 and value is != 0
-  if (!(flags & FLAGS_PRECISION) || value) {
+  else {
     do {
       const char digit = (char)(value % base);
       buf[len++] = (char)(digit < 10 ? '0' + digit : (flags & FLAGS_UPPERCASE ? 'A' : 'a') + digit - 10);