STRSEP(3) Library Routines STRSEP(3)
strsep - separate strings
char * strsep (char **stringp, char *delim);
The strsep function locates, in the string referenced by *stringp, the
first occurrence of any character in the string delim (or the terminat-
ing 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 charac-
ters, can be detected by comparing the location referenced by the
pointer returned in *stringp to .
If *stringp is initially NULL, strsep returns NULL.
The following uses strsep to parse a string, containing tokens delim-
ited by white space, into an argument vector:
char **ap, *argv, *inputstring;
for (ap = argv; (*ap = strsep(&inputstring, " \t")) != NULL;)
if (**ap != '\0')
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/C) it is unable to handle empty fields,
i.e. detect fields delimited by two adjacent delimiter characters, or
to be used for more than a single string at a time. The strsep func-
tion first appeared in 4.4BSD.
GNO 27 January 1997 STRSEP(3)
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