#include "input.h"

enum { LIBSCOMP_READ, LIBSCOMP_DISCARD };

void libscomp_reset(struct libscomp_input *in) {
	in->state = LIBSCOMP_READ;
	in->len = 0;
}

static enum libscomp_input_r libscomp_parse(
	struct libscomp_input *in, struct libscomp_line *line) {
	char *s = in->intbuf;
	enum libscomp_input_r r = LIBSCOMP_ARG_OVERFLOW;

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

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

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

	libscomp_reset(in);
	return r;
}

enum libscomp_input_r libscomp_read(struct libscomp_input *in,
                                    char **s,
                                    struct libscomp_line *line) {
	char c;

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

		if (in->state == LIBSCOMP_DISCARD) {
			if (c == '\n') {
				libscomp_reset(in);
				return LIBSCOMP_OVERFLOW;
			}
		} else {
			switch (c) {
			case '\n':
				in->intbuf[in->len] = 0;
				return libscomp_parse(in, line);
			default:
				in->intbuf[in->len++] = c;
				if (in->len == LIBSCOMP_MAXBUF)
					in->state = LIBSCOMP_DISCARD;
			}
		}
	}

	return LIBSCOMP_MORE;
}