More vsnprintf() emulation function bug fixes.

mxml-string.c

@@ -138,10 +138,10 @@ mxml_vsnprintf(char       *buffer,	/* O - Output buffer */
 		sign,			/* Sign of format width */
 		size,			/* Size character (h, l, L) */
 		type;			/* Format type character */
-  const char	*bufformat;		/* Start of format */
   int		width,			/* Width of field */
 		prec;			/* Number of characters of precision */
   char		tformat[100],		/* Temporary format string for sprintf() */
+		*tptr,			/* Pointer into temporary format */
 		temp[1024];		/* Buffer for formatted numbers */
   char		*s;			/* Pointer to string */
   int		slen;			/* Length of string */
@@ -160,30 +160,74 @@ mxml_vsnprintf(char       *buffer,	/* O - Output buffer */
   {
     if (*format == '%')
     {
-      bufformat = format;
+      tptr = tformat;
-      format ++;
+      *tptr++ = *format++;
 
       if (*format == '%')
       {
-        *bufptr++ = *format++;
+        if (bufptr && bufptr < bufend) *bufptr++ = *format;
+        bytes ++;
+        format ++;
 	continue;
       }
       else if (strchr(" -+#\'", *format))
+      {
+        *tptr++ = *format;
         sign = *format++;
+      }
       else
         sign = 0;
 
-      width = 0;
+      if (*format == '*')
-      while (isdigit(*format))
+      {
-        width = width * 10 + *format++ - '0';
+        // Get width from argument...
+	format ++;
+	width = va_arg(ap, int);
+
+	snprintf(tptr, sizeof(tformat) - (tptr - tformat), "%d", width);
+	tptr += strlen(tptr);
+      }
+      else
+      {
+	width = 0;
+
+	while (isdigit(*format & 255))
+	{
+	  if (tptr < (tformat + sizeof(tformat) - 1))
+	    *tptr++ = *format;
+
+	  width = width * 10 + *format++ - '0';
+	}
+      }
 
       if (*format == '.')
       {
+	if (tptr < (tformat + sizeof(tformat) - 1))
+	  *tptr++ = *format;
+
         format ++;
-	prec = 0;
 
-	while (isdigit(*format))
+        if (*format == '*')
-          prec = prec * 10 + *format++ - '0';
+	{
+          // Get precision from argument...
+	  format ++;
+	  prec = va_arg(ap, int);
+
+	  snprintf(tptr, sizeof(tformat) - (tptr - tformat), "%d", prec);
+	  tptr += strlen(tptr);
+	}
+	else
+	{
+	  prec = 0;
+
+	  while (isdigit(*format & 255))
+	  {
+	    if (tptr < (tformat + sizeof(tformat) - 1))
+	      *tptr++ = *format;
+
+	    prec = prec * 10 + *format++ - '0';
+	  }
+	}
       }
       else
         prec = -1;
@@ -191,15 +235,31 @@ mxml_vsnprintf(char       *buffer,	/* O - Output buffer */
       if (*format == 'l' && format[1] == 'l')
       {
         size = 'L';
+
+	if (tptr < (tformat + sizeof(tformat) - 2))
+	{
+	  *tptr++ = 'l';
+	  *tptr++ = 'l';
+	}
+
 	format += 2;
       }
       else if (*format == 'h' || *format == 'l' || *format == 'L')
+      {
+	if (tptr < (tformat + sizeof(tformat) - 1))
+	  *tptr++ = *format;
+
         size = *format++;
+      }
 
       if (!*format)
         break;
 
-      type = *format++;
+      if (tptr < (tformat + sizeof(tformat) - 1))
+        *tptr++ = *format;
+
+      type  = *format++;
+      *tptr = '\0';
 
       switch (type)
       {
@@ -208,13 +268,9 @@ mxml_vsnprintf(char       *buffer,	/* O - Output buffer */
 	case 'e' :
 	case 'f' :
 	case 'g' :
-	    if ((format - bufformat + 1) > sizeof(tformat) ||
+	    if ((width + 2) > sizeof(temp))
-	        (width + 2) > sizeof(temp))
 	      break;
 
-	    strncpy(tformat, bufformat, format - bufformat);
-	    tformat[format - bufformat] = '\0';
-
 	    sprintf(temp, tformat, va_arg(ap, double));
 
             bytes += strlen(temp);
@@ -223,9 +279,8 @@ mxml_vsnprintf(char       *buffer,	/* O - Output buffer */
 	    {
 	      if ((bufptr + strlen(temp)) > bufend)
 	      {
-		strncpy(bufptr, temp, bufend - bufptr);
+		strncpy(bufptr, temp, (size_t)(bufend - bufptr));
 		bufptr = bufend;
-		break;
 	      }
 	      else
 	      {
@@ -243,13 +298,9 @@ mxml_vsnprintf(char       *buffer,	/* O - Output buffer */
 	case 'o' :
 	case 'u' :
 	case 'x' :
-	    if ((format - bufformat + 1) > sizeof(tformat) ||
+	    if ((width + 2) > sizeof(temp))
-	        (width + 2) > sizeof(temp))
 	      break;
 
-	    strncpy(tformat, bufformat, format - bufformat);
-	    tformat[format - bufformat] = '\0';
-
 	    sprintf(temp, tformat, va_arg(ap, int));
 
             bytes += strlen(temp);
@@ -258,9 +309,8 @@ mxml_vsnprintf(char       *buffer,	/* O - Output buffer */
 	    {
 	      if ((bufptr + strlen(temp)) > bufend)
 	      {
-		strncpy(bufptr, temp, bufend - bufptr);
+		strncpy(bufptr, temp, (size_t)(bufend - bufptr));
 		bufptr = bufend;
-		break;
 	      }
 	      else
 	      {
@@ -269,15 +319,11 @@ mxml_vsnprintf(char       *buffer,	/* O - Output buffer */
 	      }
 	    }
 	    break;
-	    
+
 	case 'p' : /* Pointer value */
-	    if ((format - bufformat + 1) > sizeof(tformat) ||
+	    if ((width + 2) > sizeof(temp))
-	        (width + 2) > sizeof(temp))
 	      break;
 
-	    strncpy(tformat, bufformat, format - bufformat);
-	    tformat[format - bufformat] = '\0';
-
 	    sprintf(temp, tformat, va_arg(ap, void *));
 
             bytes += strlen(temp);
@@ -286,9 +332,8 @@ mxml_vsnprintf(char       *buffer,	/* O - Output buffer */
 	    {
 	      if ((bufptr + strlen(temp)) > bufend)
 	      {
-		strncpy(bufptr, temp, bufend - bufptr);
+		strncpy(bufptr, temp, (size_t)(bufend - bufptr));
 		bufptr = bufend;
-		break;
 	      }
 	      else
 	      {
@@ -304,13 +349,13 @@ mxml_vsnprintf(char       *buffer,	/* O - Output buffer */
 	    if (bufptr)
 	    {
 	      if (width <= 1)
-		*bufptr++ = va_arg(ap, int);
+	        *bufptr++ = va_arg(ap, int);
 	      else
 	      {
 		if ((bufptr + width) > bufend)
-	          width = bufend - bufptr;
+		  width = bufend - bufptr;
 
-		memcpy(bufptr, va_arg(ap, char *), width);
+		memcpy(bufptr, va_arg(ap, char *), (size_t)width);
 		bufptr += width;
 	      }
 	    }
@@ -329,20 +374,20 @@ mxml_vsnprintf(char       *buffer,	/* O - Output buffer */
 	    if (bufptr)
 	    {
 	      if ((bufptr + width) > bufend)
-		width = bufend - bufptr;
+	        width = bufend - bufptr;
 
               if (slen > width)
-		slen = width;
+	        slen = width;
 
 	      if (sign == '-')
 	      {
-		strncpy(bufptr, s, slen);
+		strncpy(bufptr, s, (size_t)slen);
-		memset(bufptr + slen, ' ', width - slen);
+		memset(bufptr + slen, ' ', (size_t)(width - slen));
 	      }
 	      else
 	      {
-		memset(bufptr, ' ', width - slen);
+		memset(bufptr, ' ', (size_t)(width - slen));
-		strncpy(bufptr + width - slen, s, slen);
+		strncpy(bufptr + width - slen, s, (size_t)slen);
 	      }
 
 	      bufptr += width;
@@ -350,31 +395,7 @@ mxml_vsnprintf(char       *buffer,	/* O - Output buffer */
 	    break;
 
 	case 'n' : /* Output number of chars so far */
-	    if ((format - bufformat + 1) > sizeof(tformat) ||
+	    *(va_arg(ap, int *)) = bytes;
-	        (width + 2) > sizeof(temp))
-	      break;
-
-	    strncpy(tformat, bufformat, format - bufformat);
-	    tformat[format - bufformat] = '\0';
-
-	    sprintf(temp, tformat, va_arg(ap, int));
-
-            bytes += strlen(temp);
-
-	    if (bufptr)
-	    {
-	      if ((bufptr + strlen(temp)) > bufend)
-	      {
-		strncpy(bufptr, temp, bufend - bufptr);
-		bufptr = bufend;
-		break;
-	      }
-	      else
-	      {
-		strcpy(bufptr, temp);
-		bufptr += strlen(temp);
-	      }
-	    }
 	    break;
       }
     }
@@ -383,7 +404,7 @@ mxml_vsnprintf(char       *buffer,	/* O - Output buffer */
       bytes ++;
 
       if (bufptr && bufptr < bufend)
-	*bufptr++ = *format;
+        *bufptr++ = *format;
 
       format ++;
     }