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strsep(3) [netbsd man page]

STRSEP(3)						   BSD Library Functions Manual 						 STRSEP(3)

strsep, stresep -- separate strings LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <string.h> char * strsep(char **stringp, const char *delim); char * stresep(char **stringp, const char *delim, int escape); DESCRIPTION
The strsep() function locates, in the nul-terminated string referenced by *stringp, the first occurrence of any character in the string delim (or the terminating '' character) and replaces it with a ''. The location of the next character after the delimiter character (or NULL, if the end of the string was reached) is stored in *stringp. The original value of *stringp is returned. An ``empty'' field, i.e., one caused by two adjacent delimiter characters, can be detected by comparing the location referenced by the pointer returned by strsep() to ''. If *stringp is initially NULL, strsep() returns NULL. The stresep() function also takes an escape character that allows quoting the delim- iter character so that it can be part of the source string. EXAMPLES
The following uses strsep() to parse a string, containing tokens delimited by white space, into an argument vector: char **ap, *argv[10], *inputstring; for (ap = argv; ap < &argv[9] && (*ap = strsep(&inputstring, " ")) != NULL;) { if (**ap != '') ap++; } HISTORY
The strsep() function is intended as a replacement for the strtok() function. While the strtok() function should be preferred for portabil- ity reasons (it conforms to ANSI X3.159-1989 (``ANSI C89'')) it is unable to handle empty fields, i.e., detect fields delimited by two adja- cent delimiter characters, or to be used for more than a single string at a time. The strsep() function first appeared in 4.4BSD. BSD
August 12, 2006 BSD

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STRSEP(3)						     Linux Programmer's Manual							 STRSEP(3)

strsep - extract token from string SYNOPSIS
#include <string.h> char *strsep(char **stringp, const char *delim); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): strsep(): _BSD_SOURCE DESCRIPTION
If *stringp is NULL, the strsep() function returns NULL and does nothing else. Otherwise, this function finds the first token in the string *stringp, where tokens are delimited by symbols in the string delim. This token is terminated with a '' character (by overwriting the delimiter) and *stringp is updated to point past the token. In case no delimiter was found, the token is taken to be the entire string *stringp, and *stringp is made NULL. RETURN VALUE
The strsep() function returns a pointer to the token, that is, it returns the original value of *stringp. CONFORMING TO
The strsep() function was introduced as a replacement for strtok(3), since the latter cannot handle empty fields. However, strtok(3) con- forms to C89/C99 and hence is more portable. BUGS
Be cautious when using this function. If you do use it, note that: * This function modifies its first argument. * This function cannot be used on constant strings. * The identity of the delimiting character is lost. SEE ALSO
index(3), memchr(3), rindex(3), strchr(3), string(3), strpbrk(3), strspn(3), strstr(3), strtok(3) COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at GNU
2010-09-20 STRSEP(3)
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