A simple example that reads integer coordinates in the form x,y into a scv_vector and prints them in lexicographical order.

coordsort.c

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

#include "scv.h"

struct point {
	int x;
	int y;
};

int point_compare(const struct point *lhs, const struct point *rhs)
{
	if (lhs->x == rhs->x) {
		return lhs->y - rhs->y;
	}

	return lhs->x - rhs->x;
}

int main(void)
{
	struct scv_vector *v;
	struct point p;
	size_t i;

	/* create a scv_vector of points, reserving space for 10 */
	v = scv_new(sizeof p, 10);

	/* read coordinates into p and append to v */
	while (scanf("%d,%d", &p.x, &p.y) == 2) {
		scv_push_back(v, &p);
	}

	/* sort points in v */
	qsort(scv_data(v), scv_size(v), scv_objsize(v), point_compare);

	/* print points */
	for (i = 0; i < scv_size(v); ++i) {
		struct point *pp = scv_at(v, i);

		printf("%d,%d\n", pp->x, pp->y);
	}

	scv_delete(v);

	return 0;
}