#include <stdio.h>
#include <stdlib.h>
#include <string.h>

/*
 * WARNING: this code does not comply with the coding standard!
*/

typedef struct
{
  int len;
  int cap;
  char* buff;
} buffer;


void init_buffer(buffer* b) {
	b->len=0;
	b->cap=80;
	b->buff=(char*)malloc(sizeof(char)*(b->cap+1));
	b->buff[0]='\0';
}

void free_buffer(buffer* b) {
	free(b->buff);
	/* we don't free b because we don't own it */ 
}

void add_to_buffer(buffer* b, char c) {
	if (b->len==b->cap-1)
	{
	    /* need to grow the buffer */
	    b->cap+=80;
	    char* temp=(char*)malloc(sizeof(char)*b->cap);
	    strcpy(temp,b->buff);
	    free(b->buff);
	    b->buff=temp;
	}
	b->buff[b->len++]=c;
	b->buff[b->len]='\0';
}


int main(int argc, char** argv) {
	buffer b;
	int i=0;
	for (;i<argc;++i) {
	    printf("argv[%d]=%s\n",i, argv[i]);
	} 
	init_buffer(&b);
	for (i=0;i<argc;++i) {
	    char* p;
	    for (p=argv[i];*p!='\0';++p)
	    {
		add_to_buffer(&b, *p);
	    }
	    add_to_buffer(&b, ' ');
	}
	fprintf(stdout, "Cmd line=%s\n", b.buff);
	free_buffer(&b);
	return 0;
}