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STRSEP(3) FreeBSD 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 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; SEE ALSO memchr(3), strchr(3), strcspn(3), strpbrk(3), strrchr(3), strspn(3), strstr(3), strtok(3) HISTORY The strsep() function is intended as a replacement for the strtok() function. While the strtok() function should be preferred for portability reasons (it conforms to ISO/IEC 9899:1990 ("ISO C90")) 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() function first appeared in 4.4BSD. FreeBSD 14.1-RELEASE-p8 May 28, 2018 FreeBSD 14.1-RELEASE-p8