#include "input.h"

enum { READ, DISCARD };

void libscomm_reset(struct libscomm_input *in) {
	in->state = READ;
	in->len = 0;
}

static enum libscomm_input_r parse(struct libscomm_input *in,
                                   struct libscomm_line *line) {
	char *s = in->intbuf;
	enum libscomm_input_r r = LIBSCOMM_ARG_OVERFLOW;

	line->name = (*s == ':');
	line->len = 0;

	while (line->len < LIBSCOMM_MAXARG) {
		line->buf[line->len++] = s;
		for (; *s && *s != '\t'; s++);

		if (!*s) {
			r = LIBSCOMM_COMPLETE;
			break;
		} else {
			*s = 0;
			s++;
		}
	}

	libscomm_reset(in);
	return r;
}

enum libscomm_input_r libscomm_read(struct libscomm_input *in,
                                    char **s,
                                    struct libscomm_line *line) {
	char c;

	while ((c = **s)) {
		(*s)++;

		if (in->state == DISCARD) {
			if (c == '\n') {
				libscomm_reset(in);
				return LIBSCOMM_OVERFLOW;
			}
		} else {
			switch (c) {
			case '\n':
				in->intbuf[in->len] = 0;
				return parse(in, line);
			default:
				in->intbuf[in->len++] = c;
				if (in->len == LIBSCOMM_MAXBUF)
					in->state = DISCARD;
			}
		}
	}

	return LIBSCOMM_MORE;
}