Line data    Source code

       1             : /* Copyright (c) 2003-2004, Roger Dingledine
       2             :  * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
       3             :  * Copyright (c) 2007-2021, The Tor Project, Inc. */
       4             : /* See LICENSE for licensing information */
       5             : 
       6             : /**
       7             :  * \file compat_string.c
       8             :  * \brief Useful string-processing functions that some platforms don't
       9             :  * provide.
      10             :  **/
      11             : 
      12             : #include "lib/string/compat_string.h"
      13             : #include "lib/err/torerr.h"
      14             : 
      15             : /* Inline the strl functions if the platform doesn't have them. */
      16             : #ifndef HAVE_STRLCPY
      17             : #include "ext/strlcpy.c"
      18             : #endif
      19             : #ifndef HAVE_STRLCAT
      20             : #include "ext/strlcat.c"
      21             : #endif
      22             : 
      23             : #include <stdlib.h>
      24             : #include <string.h>
      25             : 
      26             : /** Helper for tor_strtok_r_impl: Advances cp past all characters in
      27             :  * <b>sep</b>, and returns its new value. */
      28             : static char *
      29          63 : strtok_helper(char *cp, const char *sep)
      30             : {
      31          63 :   if (sep[1]) {
      32          39 :     while (*cp && strchr(sep, *cp))
      33          13 :       ++cp;
      34             :   } else {
      35          51 :     while (*cp && *cp == *sep)
      36          14 :       ++cp;
      37             :   }
      38          63 :   return cp;
      39             : }
      40             : 
      41             : /** Implementation of strtok_r for platforms whose coders haven't figured out
      42             :  * how to write one.  Hey, retrograde libc developers!  You can use this code
      43             :  * here for free! */
      44             : char *
      45          65 : tor_strtok_r_impl(char *str, const char *sep, char **lasts)
      46             : {
      47          65 :   char *cp, *start;
      48          65 :   raw_assert(*sep);
      49          65 :   if (str) {
      50          18 :     str = strtok_helper(str, sep);
      51          18 :     if (!*str)
      52             :       return NULL;
      53           8 :     start = cp = *lasts = str;
      54          47 :   } else if (!*lasts || !**lasts) {
      55             :     return NULL;
      56             :   } else {
      57             :     start = cp = *lasts;
      58             :   }
      59             : 
      60          47 :   if (sep[1]) {
      61         132 :     while (*cp && !strchr(sep, *cp))
      62         111 :       ++cp;
      63             :   } else {
      64          26 :     cp = strchr(cp, *sep);
      65             :   }
      66             : 
      67          47 :   if (!cp || !*cp) {
      68           2 :     *lasts = NULL;
      69             :   } else {
      70          45 :     *cp++ = '\0';
      71          45 :     *lasts = strtok_helper(cp, sep);
      72             :   }
      73             :   return start;
      74             : }