GNU
February 13, 2000
Aliases: strtok_r(3), strtok_r(3), strtok_r(3), strtok_r(3), strtok_r(3), strtok_r(3), strtok_r(3), strtok_r(3), strtok_r(3), strtok_r(3)
manpages-pt-dev
Portuguese Versions of the Manual Pages (dev sections)
manpages-dev
Manual pages about using GNU/Linux for development
man-pages
Linux kernel and C library user-space interface documentation
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 \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 found.
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.
BUGS
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.
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 | |
