Linux cli command strsep

➡ A Linux man page (short for manual page) is a form of software documentation found on Linux and Unix-like operating systems. This man-page explains the command strsep and provides detailed information about the command strsep, system calls, library functions, and other aspects of the system, including usage, options, and examples of _. You can access this man page by typing man followed by the strsep.

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NAME 🖥️ strsep 🖥️

extract token from string

LIBRARY

Standard C library (libc, -lc)

SYNOPSIS

#include <string.h>
char *strsep(char **restrict stringp, const char *restrict delim);

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

strsep():

    Since glibc 2.19:
        _DEFAULT_SOURCE
    glibc 2.19 and earlier:
        _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 that is delimited by one of the bytes in the string delim. This token is terminated by overwriting the delimiter with a null byte (‘�’), 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.

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).

InterfaceAttributeValue

strsep()

Thread safetyMT-Safe

STANDARDS

None.

HISTORY

4.4BSD.

The strsep() function was introduced as a replacement for strtok(3), since the latter cannot handle empty fields. However, strtok(3) conforms 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.

EXAMPLES

The program below is a port of the one found in strtok(3), which, however, doesn’t discard multiple delimiters or empty tokens:

$ ./a.out 'a/bbb///cc;xxx:yyy:' ':;' '/'
1: a/bbb///cc
         --> a
         --> bbb
         -->
         -->
         --> cc
2: xxx
         --> xxx
3: yyy
         --> yyy
4:
         -->

Program source

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int
main(int argc, char *argv[])
{
    char *token, *subtoken;
    if (argc != 4) {
        fprintf(stderr, "Usage: %s string delim subdelim

“, argv[0]); exit(EXIT_FAILURE); } for (unsigned int j = 1; (token = strsep(&argv[1], argv[2])); j++) { printf("%u: %s “, j, token); while ((subtoken = strsep(&token, argv[3]))) printf(” –> %s “, subtoken); } exit(EXIT_SUCCESS); }

SEE ALSO

memchr(3), strchr(3), string(3), strpbrk(3), strspn(3), strstr(3), strtok(3)

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