#include "xmalloc.h"

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

extern char *program_name;

void malloc_fail(void)
{
	fprintf(stderr, "%s: could not allocate memory: %s\n", program_name, strerror(errno));
	exit(42);
}

char *xstrndup(const char *str, size_t n)
{
	int len;
	char *s;

	len = strlen(str);
	if (n > len)
		n = len;
	s = malloc(n + 1);
	if (unlikely(s == NULL))
		malloc_fail();
	memcpy(s, str, n);
	s[n] = 0;
	return s;
}

char **str_array_add(char **a, int *allocp, int *posp, char *str)
{
	int alloc = *allocp;
	int pos = *posp;

	if (pos + 1 >= alloc) {
		alloc = (alloc + 16) * 3 / 2 + 1;
		a = xrenew(char *, a, alloc);
		*allocp = alloc;
	}
	a[pos++] = str;
	*posp = pos;
	return a;
}