strsep(3) - NetBSD Manual Pages

STRSEP(3)               NetBSD Library Functions Manual              STRSEP(3)


NAME
strsep - separate strings
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <string.h> char * strsep(char **stringp, const char *delim);
DESCRIPTION
The strsep() function locates, in the null-terminated string referenced by *stringp, the first occurrence of any character in the string delim (or the terminating `\0' character) and replaces it with a `\0'. 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 `\0'. If *stringp is initially NULL, strsep() returns NULL.
EXAMPLES
The following uses strsep() to parse a string, containing tokens delim- ited by white space, into an argument vector: char **ap, *argv[10], *inputstring; for (ap = argv; ap < &argv[9] && (*ap = strsep(&inputstring, " \t")) != NULL;) { if (**ap != '\0') ap++; }
HISTORY
The strsep() function is intended as a replacement for the strtok() func- tion. While the strtok() function should be preferred for portability reasons (it conforms to ANSI X3.159-1989 (``ANSI C'')) it is unable to handle empty fields, i.e. detect fields delimited by two adjacent delim- iter characters, or to be used for more than a single string at a time. The strsep() function first appeared in 4.4BSD. NetBSD 2.0.2 August 11, 2002 NetBSD 2.0.2

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