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/* Copyright (c) 2003-2004, Roger Dingledine
* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
* Copyright (c) 2007-2019, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* \file compat_string.c
* \brief Useful string-processing functions that some platforms don't
* provide.
**/
#include "lib/string/compat_string.h"
#include "lib/err/torerr.h"
/* Inline the strl functions if the platform doesn't have them. */
#ifndef HAVE_STRLCPY
#include "strlcpy.c"
#endif
#ifndef HAVE_STRLCAT
#include "strlcat.c"
#endif
#include <stdlib.h>
#include <string.h>
/** Helper for tor_strtok_r_impl: Advances cp past all characters in
* <b>sep</b>, and returns its new value. */
static char *
strtok_helper(char *cp, const char *sep)
{
if (sep[1]) {
while (*cp && strchr(sep, *cp))
++cp;
} else {
while (*cp && *cp == *sep)
++cp;
}
return cp;
}
/** Implementation of strtok_r for platforms whose coders haven't figured out
* how to write one. Hey, retrograde libc developers! You can use this code
* here for free! */
char *
tor_strtok_r_impl(char *str, const char *sep, char **lasts)
{
char *cp, *start;
raw_assert(*sep);
if (str) {
str = strtok_helper(str, sep);
if (!*str)
return NULL;
start = cp = *lasts = str;
} else if (!*lasts || !**lasts) {
return NULL;
} else {
start = cp = *lasts;
}
if (sep[1]) {
while (*cp && !strchr(sep, *cp))
++cp;
} else {
cp = strchr(cp, *sep);
}
if (!cp || !*cp) {
*lasts = NULL;
} else {
*cp++ = '\0';
*lasts = strtok_helper(cp, sep);
}
return start;
}
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