strsep3
Separate strings
Usage
#include <string.h>
char *
strsep(char **stringp, const char *delim);
Library
Standard C Library (libc, -lc)
Overview
The strsep() function locates, in the 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., a character in the string delim occurs as the first character of *stringp) can be detected by comparing the location referenced by the returned pointer to ‘\0’.
If *stringp is initially NULL, strsep() returns NULL.
Examples
The following uses strsep() to parse a string, and prints each token in separate line:
char *token, *string, *tofree;
tofree = string = strdup("abc,def,ghi");
if (string == NULL)
err(1, "strdup");
while ((token = strsep(&string, ",")) != NULL)
printf("%s\n", token);
free(tofree);
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 = strsep(&inputstring, " \t")) != NULL;) if (**ap != '\0') if (++ap >= &argv[10]) break;
Releases
87 releases since FreeBSD 2.0.5-RELEASE; the text changed 43 times.