util-src/ringbuffer.c
author Kim Alvefur <zash@zash.se>
Tue, 02 Feb 2016 20:24:27 +0100
changeset 7120 2b4432cc9c29
child 7821 54669df178c2
permissions -rw-r--r--
Add util.ringbuffer, a ringbuffer with a file handle like interface
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdio.h>
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#include <lua.h>
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#include <lauxlib.h>
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#define MIN(a, b) ((a)>(b)?(b):(a))
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#define MAX(a, b) ((a)>(b)?(a):(b))
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typedef struct {
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	size_t rpos; /* read position */
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	size_t wpos; /* write position */
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	size_t alen; /* allocated size */
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	size_t blen; /* current content size */
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	char* buffer;
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} ringbuffer;
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char readchar(ringbuffer* b) {
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	b->blen--;
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	return b->buffer[(b->rpos++) % b->alen];
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}
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void writechar(ringbuffer* b, char c) {
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	b->blen++;
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	b->buffer[(b->wpos++) % b->alen] = c;
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}
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/* make sure position counters stay within the allocation */
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void modpos(ringbuffer* b) {
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	b->rpos = b->rpos % b->alen;
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	b->wpos = b->wpos % b->alen;
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}
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int find(ringbuffer* b, const char* s, int l) {
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	size_t i, j;
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	int m;
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	if(b->rpos == b->wpos) { /* empty */
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		return 0;
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	}
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	for(i = 0; i <= b->blen - l; i++) {
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		if(b->buffer[(b->rpos + i) % b->alen] == *s) {
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			m = 1;
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			for(j = 1; j < l; j++)
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				if(b->buffer[(b->rpos + i + j) % b->alen] != s[j]) {
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					m = 0;
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					break;
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				}
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			if(m) {
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				return i + l;
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			}
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		}
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	}
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	return 0;
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}
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int rb_find(lua_State* L) {
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	size_t l, m;
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	ringbuffer* b = luaL_checkudata(L, 1, "ringbuffer_mt");
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	const char* s = luaL_checklstring(L, 2, &l);
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	m = find(b, s, l);
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	if(m > 0) {
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		lua_pushinteger(L, m);
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		return 1;
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	}
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	return 0;
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}
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int rb_read(lua_State* L) {
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	ringbuffer* b = luaL_checkudata(L, 1, "ringbuffer_mt");
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	int r = luaL_checkinteger(L, 2);
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	int peek = lua_toboolean(L, 3);
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	if(r > b->blen) {
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		lua_pushnil(L);
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		return 1;
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	}
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	if((b->rpos + r) > b->alen) {
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		lua_pushlstring(L, &b->buffer[b->rpos], b->alen - b->rpos);
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		lua_pushlstring(L, b->buffer, r - (b->alen - b->rpos));
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		lua_concat(L, 2);
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	} else {
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		lua_pushlstring(L, &b->buffer[b->rpos], r);
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	}
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	if(!peek) {
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		b->blen -= r;
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		b->rpos += r;
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		modpos(b);
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	}
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	return 1;
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}
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int rb_readuntil(lua_State* L) {
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	size_t l, m;
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	ringbuffer* b = luaL_checkudata(L, 1, "ringbuffer_mt");
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	const char* s = luaL_checklstring(L, 2, &l);
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	m = find(b, s, l);
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	if(m > 0) {
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		lua_settop(L, 1);
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		lua_pushinteger(L, m);
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		return rb_read(L);
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	}
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	return 0;
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}
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int rb_write(lua_State* L) {
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	size_t l, w = 0;
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	ringbuffer* b = luaL_checkudata(L, 1, "ringbuffer_mt");
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	const char* s = luaL_checklstring(L, 2, &l);
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	/* Does `l` bytes fit? */
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	if((l + b->blen) > b->alen) {
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		lua_pushnil(L);
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		return 1;
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	}
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	while(l-- > 0) {
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		writechar(b, *s++);
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		w++;
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	}
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	modpos(b);
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	lua_pushinteger(L, w);
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	return 1;
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}
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int rb_tostring(lua_State* L) {
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	ringbuffer* b = luaL_checkudata(L, 1, "ringbuffer_mt");
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	lua_pushfstring(L, "ringbuffer: %p->%p %d/%d", b, b->buffer, b->blen, b->alen);
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	return 1;
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}
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int rb_length(lua_State* L) {
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	ringbuffer* b = luaL_checkudata(L, 1, "ringbuffer_mt");
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	lua_pushinteger(L, b->blen);
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	return 1;
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}
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int rb_size(lua_State* L) {
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	ringbuffer* b = luaL_checkudata(L, 1, "ringbuffer_mt");
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	lua_pushinteger(L, b->alen);
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	return 1;
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}
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int rb_free(lua_State* L) {
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	ringbuffer* b = luaL_checkudata(L, 1, "ringbuffer_mt");
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	lua_pushinteger(L, b->alen - b->blen);
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	return 1;
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}
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int rb_new(lua_State* L) {
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	size_t size = luaL_optinteger(L, 1, sysconf(_SC_PAGESIZE));
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	ringbuffer* b = lua_newuserdata(L, sizeof(ringbuffer));
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	b->rpos = 0;
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	b->wpos = 0;
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	b->alen = size;
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	b->blen = 0;
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	b->buffer = malloc(size);
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	if(b->buffer == NULL) {
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		return 0;
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	}
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	luaL_getmetatable(L, "ringbuffer_mt");
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	lua_setmetatable(L, -2);
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	return 1;
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}
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int rb_gc(lua_State* L) {
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	ringbuffer* b = luaL_checkudata(L, 1, "ringbuffer_mt");
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	if(b->buffer != NULL) {
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		free(b->buffer);
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	}
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	return 0;
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}
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int luaopen_util_ringbuffer(lua_State* L) {
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	if(luaL_newmetatable(L, "ringbuffer_mt")) {
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		lua_pushcfunction(L, rb_tostring);
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		lua_setfield(L, -2, "__tostring");
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		lua_pushcfunction(L, rb_length);
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		lua_setfield(L, -2, "__len");
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		lua_pushcfunction(L, rb_gc);
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		lua_setfield(L, -2, "__gc");
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		lua_newtable(L); /* __index */
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		{
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			lua_pushcfunction(L, rb_find);
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			lua_setfield(L, -2, "find");
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			lua_pushcfunction(L, rb_read);
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			lua_setfield(L, -2, "read");
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			lua_pushcfunction(L, rb_readuntil);
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			lua_setfield(L, -2, "readuntil");
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			lua_pushcfunction(L, rb_write);
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			lua_setfield(L, -2, "write");
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			lua_pushcfunction(L, rb_size);
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			lua_setfield(L, -2, "size");
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			lua_pushcfunction(L, rb_length);
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			lua_setfield(L, -2, "length");
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			lua_pushcfunction(L, rb_free);
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			lua_setfield(L, -2, "free");
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   224
		}
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		lua_setfield(L, -2, "__index");
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	}
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   227
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	lua_newtable(L);
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	lua_pushcfunction(L, rb_new);
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	lua_setfield(L, -2, "new");
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	return 1;
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}