2016年7月15日 · Note that strtok remembers its state for the tokenizing session. And for this reason it is not reentrant or thread safe (you should be using strtok_r instead). Another thing to know is that it actually modifies the original string. It writes '\0' for teh delimiters that it finds. One way to invoke strtok, succintly, is as follows:

Be warned about the general shortcomings of strtok() (from manual): These functions modify their first argument. These functions cannot be used on constant strings. The identity of the delimiting byte is lost. The strtok() function uses a static buffer while parsing, so it's not thread safe. Use strtok_r() if this matters to you.

2012年1月26日 · WARNING: Microsoft strtok_s and C11 strtok_s are completely different! Microsoft strtok_s has only 3 parameters, while C11 strtok_s has 4 parameters, so it can be a compatible issue in the future. The prototype of Microsoft strtok_s is. char* strtok_s(char* str, const char* delimiters, char** context); The prototype of C11 strtok_s is

In the comment in your question, you say that you "Call strtok on 'line' multiple times until it returns NULL". This sounds as if you may be using strtok incorrectly. The first time you call it, you should call it with 'line' as an argument; on subsequent calls, you should pass it NULL. Take the following as an example:

You cannot do that with strtok(); use strtok_r() from POSIX or strtok_s() from Microsoft if they are available, or rethink your design. char *strtok_r(char *restrict s, const char *restrict sep, char **restrict lasts); char *strtok_s(char *strToken, const char *strDelimit, char **context); These two functions are interchangeable.

2010年10月27日 · strtok() is not MT-safe because it stores some intermediate variables globally and reuse them at each call (see you don't have to pass again the string each time you call strtok()). You can have a look at the man pages of methods you are using and it is always indicated at the end if it is MT-safe or not.

2010年3月7日 · The string input would be > bc <address1> <address2> length I can break the string into tokens using strtok but not sure how to take each separate token and for example convert

2012年2月27日 · I'm trying to tokenize an input string, but after the first token strtok only returns NULL. But if I hard-write the string in the program, everything works flawlessly. But if I hard-write the string in the program, everything works flawlessly.

2023年8月22日 · When strtok finds a delimiter, it changes that delimiter in the searched string to the string null-terminator, skips all delimiter characters, and save a pointer to the character after the delimiters (which will be the start of the next token). The pointer to the start of the current token is then returned.

2024年11月19日 · The strtok function uses static data to keep track of what it's parsed so far. If you attempt to use it to do multiple "levels" of delimiters like this, the parsing at one level will interfere with the parsing at another level. For this, you instead want to use strtok_r. This function takes an additional argument to keep track of its state.