Implementation of strsep Function C Language

Prototype: char * strsep (char ** stringp, const char * delim );

Function: Splits a string into a group of strings.

Example:

# Include <stdio. h>

# Include <string. h>

Int main (void)

{

Char STR [] = "root: X: 0: Root:/root:/bin/Bash :";

Char * Buf;

Char * token;

Buf = STR;

While (token = strsep (& Buf ,":"))! = NULL ){

Printf ("% s \ n", token );

}

Return 0;

}

Another exampleProgram:

# Include <stdio. h>

# Include <string. h>

Void main ()

{

Char STR [] = "number = 100 & maxmtu = 200 ";

Char * Name, * value, * next;

Int I;

Value = STR; // point the pointer value to the string STR;

For (I = 0; I <2; I ++)

{// At the first execution

Name = strsep (& value, "="); // splits the string with "=". Then, the return value of the strsep function is "Number", that is, the string before "= ".

Next = value; // the pointer value points to the string after "=", that is, "100 & maxmtu = 200"

Value = strsep (& next, "&"); // in this case, use "&" to separate the string. The returned value is 100. Next indicates "maxmtu = 200"

Printf ("name = % s \ n", name); // print the value of name after one split

Printf ("value = % s \ n", value );

Value = next;

}

}

The execution result is:

Name = Number

Value = 100

Name = maxmtu

Value = 200

The C language is implemented as follows:

 
Char * strsep (char ** STR, const char * delims) {char * token; If (! * Str) {/* No more tokens */return NULL;} token = * STR; while (** Str! = '\ 0') {If (strchr (delims, ** Str) {** STR =' \ 0'; (* Str) ++; return Token ;} (* Str) ++;}/* There is no other token */* STR = NULL; return Token ;}