/*
** CSV parsing
** prototype, just hacked down quickly, to illustrate the general
** concept (... and for fun)
*/

#include <stdio.h>

int
main(void)
{
	int c, fieldnum=1;
	char *cp, buf[BUFSIZ];
	enum state {Sep, Inquote, Noquote, Escape} state = Sep;

	cp = buf;
	while ((c=getchar()) != EOF) {
		switch (c) {
		case '\n':
			if (state == Inquote) {
				fprintf(stderr, "Open quotes at EOL\n");
				continue;
			} else if (state == Escape) {
				/* end of quote */
				state = Sep;
			}
			*cp++ = '\0';
			printf("Field %02d: %s\n", fieldnum, buf);
			buf[0] = '\n';
			cp = buf;
			putchar('\n');
			fieldnum = 1;
			break;

		case ',':
			if (state == Inquote) {
				*cp++ = c;
				continue;
			} else if (state == Escape) {
				/* end of quotes */
				state = Sep;
			}
			*cp++ = '\0';
			printf("Field %02d: %s\n", fieldnum, buf);
			buf[0] = '\n';
			cp = buf;
			fieldnum++;
			break;

		case '"':
			if (state == Sep) {
				state = Inquote;
			} else if (state == Inquote) {
				state = Escape;
			} else if (state == Noquote) {
				*cp++ = c;
			} else if (state == Escape) {
				*cp++ = c;
				state = Inquote;
			}
			break;

		default:
			*cp++ = c;
			break;
		}
	}

	return 0;
}