01-16-2014
Make sure to follow proper usage of this function, where on the first call the 1st argument should point to the input string, then on the following calls it should be NULL.
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LEARN ABOUT REDHAT
strtok_r
STRTOK(3) Linux Programmer's Manual STRTOK(3)
NAME
strtok, strtok_r - extract tokens from strings
SYNOPSIS
#include <string.h>
char *strtok(char *s, const char *delim);
char *strtok_r(char *s, const char *delim, char **ptrptr);
DESCRIPTION
A `token' is a nonempty string of characters not occurring in the string delim, followed by 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. Subse-
quent 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
found.
If a token ends with a delimiter, this delimiting character is overwritten with a 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 is a reentrant version of the strtok() function, which instead of using its own static buffer, requires a pointer
to a user allocated char*. This pointer, the ptrptr parameter, must be the same while parsing the same string.
BUGS
Never use these functions. If you do, note that:
These functions modify their first argument.
These functions cannot be used on constant strings.
The identity of the delimiting character 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.
RETURN VALUE
The strtok() function returns a pointer to the next token, or NULL if there are no more tokens.
CONFORMING TO
strtok()
SVID 3, POSIX, BSD 4.3, ISO 9899
strtok_r()
POSIX.1c
SEE ALSO
index(3), memchr(3), rindex(3), strchr(3), strpbrk(3), strsep(3), strspn(3), strstr(3)
GNU
2000-02-13 STRTOK(3)