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strtok, strtok_r - extract tokens from strings
char *strtok(char *s, const char *delim);
char *strtok_r(char *s, const char *delim, char **ptrptr);
A ‘token’ is a nonempty string of characters not occurring in the
string delim, followed by \0 or by a character occurring in delim.
The strtok() function can be used to parse the string s into tokens.
The first call to strtok() should have s as its first argument.
Subsequent calls should have the first argument set to NULL. Each call
returns a pointer to the next token, or NULL when no more tokens are
If a token ends with a delimiter, this delimiting character is
overwritten with a \0 and a pointer to the next character is saved for
the next call to strtok(). The delimiter string delim may be different
for each call.
The strtok_r() function works the same as the strtok() function, but
instead of using a static buffer it uses a pointer to a user allocated
char* pointer. This pointer, the ptrptr parameter, must be the same
while parsing the same string.
Never use these functions. If you do, note that:
These functions modify their first argument.
The identity of the delimiting character is lost.
These functions cannot be used on constant strings.
The strtok() function uses a static buffer while parsing, so
it’s not thread safe. Use strtok_r() if this matters to you.
The strtok() function returns a pointer to the next token, or NULL if
there are no more tokens.
SVID 3, POSIX, BSD 4.3, ISO 9899
index(3), memchr(3), rindex(3), strchr(3), strpbrk(3), strsep(3),