#define MAXLEN 1000   /* max length of any input line */
int getline(char *, int);
char *alloc(int);

/* readlines:  read input lines */
int readlines(char *lineptr[], int maxlines)
{
	int len, nlines;
	char *p, line[MAXLEN];

	nlines = 0;
	while ((len = getline(line, MAXLEN)) > 0)
		if (nlines >= maxlines || (p = alloc(len)) == NULL)
			return -1;
		else {
			line[len-1] = '\0'; /* delete newline */
			strcpy(p, line);
			lineptr[nlines++] = p;
		}
	return nlines;
}