Tor  0.4.3.0-alpha-dev
compat_string.c
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1 /* Copyright (c) 2003-2004, Roger Dingledine
2  * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
3  * Copyright (c) 2007-2019, 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 
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 strtok_helper(char *cp, const char *sep)
30 {
31  if (sep[1]) {
32  while (*cp && strchr(sep, *cp))
33  ++cp;
34  } else {
35  while (*cp && *cp == *sep)
36  ++cp;
37  }
38  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 tor_strtok_r_impl(char *str, const char *sep, char **lasts)
46 {
47  char *cp, *start;
48  raw_assert(*sep);
49  if (str) {
50  str = strtok_helper(str, sep);
51  if (!*str)
52  return NULL;
53  start = cp = *lasts = str;
54  } else if (!*lasts || !**lasts) {
55  return NULL;
56  } else {
57  start = cp = *lasts;
58  }
59 
60  if (sep[1]) {
61  while (*cp && !strchr(sep, *cp))
62  ++cp;
63  } else {
64  cp = strchr(cp, *sep);
65  }
66 
67  if (!cp || !*cp) {
68  *lasts = NULL;
69  } else {
70  *cp++ = '\0';
71  *lasts = strtok_helper(cp, sep);
72  }
73  return start;
74 }
static char * strtok_helper(char *cp, const char *sep)
Definition: compat_string.c:29
char * tor_strtok_r_impl(char *str, const char *sep, char **lasts)
Definition: compat_string.c:45
Header for compat_string.c.
Headers for torerr.c.