95 lines
2.9 KiB
C
95 lines
2.9 KiB
C
/*
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FUNCTION
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<<strtok>>, <<strtok_r>>, <<strsep>>---get next token from a string
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INDEX
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strtok
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INDEX
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strtok_r
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INDEX
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strsep
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SYNOPSIS
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#include <string.h>
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char *strtok(char *restrict <[source]>,
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const char *restrict <[delimiters]>);
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char *strtok_r(char *restrict <[source]>,
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const char *restrict <[delimiters]>,
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char **<[lasts]>);
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char *strsep(char **<[source_ptr]>, const char *<[delimiters]>);
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DESCRIPTION
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The <<strtok>> function is used to isolate sequential tokens in a
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null-terminated string, <<*<[source]>>>. These tokens are delimited
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in the string by at least one of the characters in <<*<[delimiters]>>>.
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The first time that <<strtok>> is called, <<*<[source]>>> should be
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specified; subsequent calls, wishing to obtain further tokens from
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the same string, should pass a null pointer instead. The separator
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string, <<*<[delimiters]>>>, must be supplied each time and may
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change between calls.
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The <<strtok>> function returns a pointer to the beginning of each
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subsequent token in the string, after replacing the separator
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character itself with a null character. When no more tokens remain,
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a null pointer is returned.
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The <<strtok_r>> function has the same behavior as <<strtok>>, except
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a pointer to placeholder <<*<[lasts]>>> must be supplied by the caller.
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The <<strsep>> function is similar in behavior to <<strtok>>, except
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a pointer to the string pointer must be supplied <<<[source_ptr]>>> and
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the function does not skip leading delimiters. When the string starts
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with a delimiter, the delimiter is changed to the null character and
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the empty string is returned. Like <<strtok_r>> and <<strtok>>, the
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<<*<[source_ptr]>>> is updated to the next character following the
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last delimiter found or NULL if the end of string is reached with
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no more delimiters.
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RETURNS
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<<strtok>>, <<strtok_r>>, and <<strsep>> all return a pointer to the
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next token, or <<NULL>> if no more tokens can be found. For
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<<strsep>>, a token may be the empty string.
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NOTES
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<<strtok>> is unsafe for multi-threaded applications. <<strtok_r>>
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and <<strsep>> are thread-safe and should be used instead.
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PORTABILITY
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<<strtok>> is ANSI C.
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<<strtok_r>> is POSIX.
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<<strsep>> is a BSD extension.
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<<strtok>>, <<strtok_r>>, and <<strsep>> require no supporting OS subroutines.
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QUICKREF
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strtok ansi impure
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*/
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/* undef STRICT_ANSI so that strtok_r prototype will be defined */
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#undef __STRICT_ANSI__
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#include <string.h>
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#include <stdlib.h>
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#include <_ansi.h>
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#include <reent.h>
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#ifdef _REENT_THREAD_LOCAL
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_Thread_local char *_tls_strtok_last;
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#endif
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#ifndef _REENT_ONLY
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extern char *__strtok_r (char *, const char *, char **, int);
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char *
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strtok (register char *__restrict s,
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register const char *__restrict delim)
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{
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struct _reent *reent = _REENT;
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_REENT_CHECK_MISC(reent);
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return __strtok_r (s, delim, &(_REENT_STRTOK_LAST(reent)), 1);
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}
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#endif
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