Range: Iterate through all values received on a channel

channel_range.h

#include "channel.h"

// Example use:
// channel_range(chan, &val) {
//     do sth with val
// }

#define unique_name_paste(id, n) id ##_## n
#define unique_name(id, n) unique_name_paste(id, n)

#define channel_range(c, p) \
	bool unique_name(__got_val_from_chan, __LINE__); \
unique_name(L, __LINE__): \
	unique_name(__got_val_from_chan, __LINE__) = false; \
	/* As long as the channel is not closed and nonempty */ \
	while (!channel_closed(c) || channel_peek(c)) { \
		if (!channel_receive(c, p, sizeof(*(p)))) { \
			continue; \
		} else { \
			unique_name(__got_val_from_chan, __LINE__) = true; \
			break; \
		} \
	} \
	/* Use of goto in for requires a statement expression */ \
	for (; unique_name(__got_val_from_chan, __LINE__); ({ goto unique_name(L, __LINE__); }))