sf_split(3) BSD Library Functions Manual sf_split(3)NAME
split, splitf, splitquotable, sjoin, join, split_network — split and join
functions
SYNOPSIS
#include <strfunc.h>
Split string and add tokens to the string array
svect *
split(const char *string, const char *delim, int flags);
int
splitf(svect *, const char *string, const char *delim, int flags);
int
splitquotable(svect *, const char *string);
Join the array tokens together
char *
join(char **, const char *delimiter);
char *
sjoin(svect *, const char *delimiter);
Stand-alone network/mask splitting function
int
split_network(const char *ip_mask, unsigned int *ip, unsigned int *mask);
DESCRIPTION
These routines allows to split or join strings by specified tokens.
int splitf(svect *, const char *string, const char *delim, int flags) is
the basic splitting function. string specifies the source string. delim
specifies the delimiter to be used to split string into tokens. flags is
the bitwise OR of the following values:
1 two or more joined delimiters will be considered to be dis‐
tinct instead of assuming them as one delimiter and skipping.
2 delimiter will be considered as the pointer to delimiting
string instead of assuming it as the pointer to character set.
4 delimiter is the regular expression. Regular expression can
be prefixed with and followed by /'es if there is a need to
put some flags after it. Refer to sf_sed(3) to obtain a flags
and additional information about regular expressions. Setting
this flag automaticaly discards 1 & 2.
Return value is the number of tokens recognized and added to the vector,
or -1 in case of an error caused by memory shortage or regular expres‐
sions handling failure.
svect * split(const char *string, const char *set, int flags) is identi‐
cal to the splitf() in one exception that it will create a new svect *
structure for you. The structure will always be allocated, but it can
contain no data if splitf() will be unable to find any tokens.
int splitquotable(svect *sl, const char *string) is the function that
recognizes single and double quotes and splits string according to them.
There is a small hack that allows to know whether this or that piece of
string (token) was originally inside the double or single quotes. The
character (byte) right after the end of string within the list
sl->list[N][sl->lens[N] + 1] will contain the ' ', '1' or '2' if the
appropriate token was originaly found within the unquoted text, single or
double quotes, respectively.
To join vector elements together, sjoin(svect *, const char *delimiter)
function may be called. Another call, join(char **list, const char
*delimiter), may be required to join the char ** values together without
using an intermediate svect * structure.
int split_network(const char *ip_mask, unsigned int *ip, unsigned int
*mask) used to split IP/Mask strings to binary IP address and mask. Both
ip and mask arguments should be supplied. They will be filled with recog‐
nized ip address and mask in network byte order. Refer to byteorder(3) or
ntohl(3). split_network() regognizes the standart forms of ip
address/mask pairs:
a.b.c.d/masklen
a.b.c.d/0xHEXMASK
a.b.c.d 0xHEXMASK
a.b.c.d/a.b.c.d
a.b.c.d a.b.c.d
or, more common
a[.[b[.c[.d]]]]/a.b[.c[.d]]]
and
a[.[b[.c[.d]]]] a.b[.c[.d]]]
EXAMPLES
Example split function...
void removeMultipleSpaces(const char *string) {
svect *sl;
/* Split string="some bad string"
* and add tokens to the vector
*/
sl = split(string, NULL, 0);
/* And join them together to form
* "some bad string"
*/
printf("%s\n", sjoin(sl, " "));
/* Destroy the string vector */
sfree(sl);
};
Split according to quotes
void quotes(const char *string) {
svect *sl;
int i;
/* Create new string vector */
sl = sinit();
/* Split string=" one 'two three' four
* and add tokens to the vector
*/
sl = splitquotable(sl, string);
/* And join them together to form
* "[one], [two three], [four], [five]"
*/
printf("[%s]\n", sjoin(sl, "], ["));
/* Single or double quoted? */
for(i = 0; i < sl->count; i++)
printf("%s: %s\n", sl->list[i],
(sl->list[i][sl->lens[i] + 1] == 0)?"plain text":
((sl->list[i][sl->lens[i] + 1] == 1)?"single quoted":
((sl->list[i][sl->lens[i] + 1] == 2)?"double quoted"))
);
/* Destroy the list */
sfree(sl);
};
SEE ALSOstrfunc(3), sf_svect(3), sf_sed(3), byteorder(3).
AUTHORS
Lev Walkin <vlm@lionet.info>
BSD March 29, 2001 BSD
