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BSD 2.11 - man page for strtok (bsd section 3)

STRTOK(3)				       Library Functions Manual 				    STRTOK(3)

NAME
strtok - string tokens
SYNOPSIS
#include <string.h> char * strtok(str, sep) char *str; char *sep;
DESCRIPTION
This interface is obsoleted by strsep(3). The strtok() function is used to isolate sequential tokens in a null-terminated string, str . These tokens are separated in the string by at least one of the characters in sep . The first time that strtok() is called, str should be specified; subsequent calls, wishing to obtain further tokens from the same string, should pass a null pointer instead. The separator string, sep , must be supplied each time, and may change between calls. The strtok() function returns a pointer to the beginning of each subsequent token in the string, after replac- ing the token itself with a NUL character. When no more tokens remain, a null pointer is returned.
SEE ALSO
index(3), memchr(3), rindex(3), strchr(3), strcspn(3), strpbrk(3), strrchr(3), strsep(3), strspn(3), strstr(3
STANDARDS
The strtok() function conforms to ANSI C X3.159-1989 (``ANSI C'').
BUGS
There is no way to get tokens from multiple strings simultaneously. The System V strtok(), if handed a string containing only delimiter characters, will not alter the next start- ing point, so that a call to strtok() with a different (or empty) delimiter string may return a non-NULL value. Since this implementation always alters the next starting point, such a sequence of calls would always return NULL. 4.4 Berkeley Distribution January 12, 1996 STRTOK(3)


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