core/fs/lib/mangle.c

   1 /**
   2  * mangle_name:
   3  *
   4  * Mangle a filename pointed to by src into a buffer pointed
   5  * to by dst; ends on encountering any whitespace.
   6  * dst is preserved.
   7  *
   8  * This verifies that a filename is < FILENAME_MAX characters,
   9  * doesn't contain whitespace, zero-pads the output buffer,
  10  * and removes redundant slashes.
  11  *
  12  */
  13
  14 #include <string.h>
  15 #include "fs.h"
  16
  17 void generic_mangle_name(char *dst, const char *src)
  18 {
  19     char *p = dst;
  20     int i = FILENAME_MAX-1;
  21
  22     while (not_whitespace(*src)) {
  23         if (*src == '/') {
  24             if (src[1] == '/') {
  25                 src++;
  26                 i--;
  27                 continue;
  28             }
  29         }
  30         i--;
  31         *dst++ = *src++;
  32     }
  33
  34     while (1) {
  35         if (dst == p)
  36             break;
  37         if (dst[-1] != '/')
  38             break;
  39         if ((dst[-1] == '/') && ((dst - 1) == p))
  40             break;
  41
  42         dst--;
  43         i++;
  44     }
  45
  46     i++;
  47     for (; i > 0; i --)
  48         *dst++ = '\0';
  49 }