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STRTOK(3) Linux Programmer's Manual STRTOK(3)
NAME
strtok, strtok_r - extract tokens from strings
SYNOPSIS
#include<string.h>
char*strtok(char*s,constchar*delim);
char*strtok_r(char*s,constchar*delim,char**ptrptr);
DESCRIPTION
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. 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 over-
written 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 is a reentrant version of the strtok() func-
tion, 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.
RETURNVALUE
The strtok() function returns a pointer to the next token, or NULL if
there are no more tokens.
CONFORMINGTO
strtok()
SVID 3, POSIX, BSD 4.3, ISO 9899
strtok_r()
POSIX.1c
SEEALSO
index(3), memchr(3), rindex(3), strchr(3), strpbrk(3), strsep(3), str-
spn(3), strstr(3)
GNU 2000-02-13 STRTOK(3)
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