strsplit.c

strsplit() cut a string into an array with a string delimiter.
The function is written to have only one malloc / free per call.
The array can be reordered or shrinked but its length can not be increased due to the original string which has been copied right after the last NULL pointer.

Prototypes

char** strsplit( const char* s, const char* del );
char** strsplit_count( const char* s, const char* del, size_t* nb );

Examples

#include <stdio.h>
#include <stdlib.h>
#include "strsplit.h"

int main( void ) {
	char** arr = strsplit( "qwerty:asdfgh::zxcvbn", ":" );

	if ( arr ) {
		printf( "%s\n", arr[ 0 ] ); // "qwerty"
		printf( "%s\n", arr[ 1 ] ); // "asdfgh"
		printf( "%s\n", arr[ 2 ] ); // ""
		printf( "%s\n", arr[ 3 ] ); // "zxcvbn"
		printf( "%p\n", arr[ 4 ] ); // NULL
		free( arr );
	}
	return 0;
}

#include <stdio.h>
#include <stdlib.h>
#include "strsplit.h"

int main( void ) {
	size_t nb;
	char** arr = strsplit_count( "qwerty:asdfgh::zxcvbn", ":", &nb );

	if ( nb == 4 ) {
		printf( "%s\n", arr[ 0 ] ); // "qwerty"
		printf( "%s\n", arr[ 1 ] ); // "asdfgh"
		printf( "%s\n", arr[ 2 ] ); // ""
		printf( "%s\n", arr[ 3 ] ); // "zxcvbn"
		printf( "%p\n", arr[ 4 ] ); // NULL
		free( arr );
	}
	return 0;
}