new file for string functions, starting with num2max5()

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@2874 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 67 insertions, 0 deletions

diff --git a/apps/string.c b/apps/string.c
new file mode 100644
index 0000000..b150178
--- /dev/null
+++ b/apps/string.c
@@ -0,0 +1,67 @@
+/***************************************************************************
+ *             __________               __   ___.                  
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___  
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /  
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <   
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \  
+ *                     \/            \/     \/    \/            \/ 
+ * $Id$
+ *
+ * Copyright (C) 2002 by Daniel Stenberg
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include "sprintf.h"
+#define ONE_KILOBYTE 1024
+#define ONE_MEGABYTE (1024*1024)
+
+/* The point of this function would be to return a string of the input data,
+   but never longer than 5 columns. Add suffix k and M when suitable...
+   Make sure to have space for 6 bytes in the buffer. 5 letters plus the
+   terminating zero byte. */
+char *num2max5(unsigned int bytes, char *max5)
+{
+    if(bytes < 100000) {
+        snprintf(max5, 6, "%5d", bytes);
+        return max5;
+    }
+    if(bytes < (9999*ONE_KILOBYTE)) {
+        snprintf(max5, 6, "%4dk", bytes/ONE_KILOBYTE);
+        return max5;
+    }
+    if(bytes < (100*ONE_MEGABYTE)) {
+        /* 'XX.XM' is good as long as we're less than 100 megs */
+        snprintf(max5, 6, "%4d.%0dM",
+                 bytes/ONE_MEGABYTE,
+                 (bytes%ONE_MEGABYTE)/(ONE_MEGABYTE/10) );
+        return max5;
+    }
+    snprintf(max5, 6, "%4dM", bytes/ONE_MEGABYTE);
+    return max5;
+}
+
+#ifdef TEST_MAX5
+int main(int argc, char **argv)
+{
+    char buffer[32];
+    if(argc>1) {
+        printf("%d => %s\n",
+               atoi(argv[1]),
+               num2max5(atoi(argv[1]), buffer));
+    }
+    return 0;
+}
+
+#endif
+
+/* -----------------------------------------------------------------
+ * local variables:
+ * eval: (load-file "../firmware/rockbox-mode.el")
+ * end:
+ */