strtok() function in C tokenizes/parses the given string using delimiter.

If either instring or delimiter is NULL, the function returns NULL. There are two problems with the standard C strtok function, which is used to split strings:. What is Strtok() function?

Return value.

On the first call to strtok_r(), str should point to the string to be parsed, and the value of saveptr is ignored The very first call to strtok() should have the string as its argument. In this tutorial, we will discuss strtok string function in C programming language. strtok() returns NULL if no token is found. The syntax of the strtok() function in the c language is :. STRTOK has similar semantics as the standard C/C++ library STRTOK function. Here we are splitting the first name and last name from the string using STRTOK function. If you have a pointer to a substring (of a null terminate C string, not a C++ String) stored literally within the original, you can determine the offset by subtracting the pointers. The delimiter character is specified as space and it returns the first name as we mentioned the token number as 1. Strtok() function is defined in string.h package. The strtok_r() function is a reentrant version strtok(). [] NotThis function is destructive: it writes the ' \0 ' characters in the elements of the string str.In particular, a string literal cannot be used as the first argument of strtok.. Each call to strtok modifies a static variable: is not thread safe. Returns pointer to the beginning of the next token or a null pointer if there are no more tokens. The standard C libraries do not contain a thread-safe or re-entrant version but some others do, such as POSIX' strtok_r.Note that on MSVC the strtok equivalent, strtok_s is thread-safe. char *strtok(char *str1, const char *delemiters); In order to convert a string to tokens, the first call to strtok() should have str1 point to the string to be tokenized. The saveptr argument is a pointer to a char * variable that is used internally by strtok_r () in order to maintain context between successive calls that parse the same string.

If instring contains fewer tokens than tokennum, the function returns a zero-length string.
Consider the following table and inserted data. Syntax for strtok( ) function is given below. The strtok_r() function is a reentrant version of strtok().
It stores the string being split between calls. Syntax char * strtok ( char * str, const char * delimiters ); Important Note. Description: The strtok() function returns a pointer to the next "token" in str1, where str2 contains the delimiters that determine the token.

Example . STRTOK example to split the first name and last name from the string STRTOK …

strnset() function is non standard function which may not available in standard library in C. Program Pointer math is a key C concept, but it can also be a tricky one, with many pitfalls for the unwary. A sequence of calls to this function split str into tokens, which are sequences of contiguous characters separated by any of the characters that are part of delimiters. – Chris Stratton Mar 4 '16 at 14:15

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