prosody
16b47c3b44f3
util-src/table.c

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util-src/table.c @ 13011:16b47c3b44f3

mod_invites_register: Allow roles to be an ordered list, first being primary Part of an update to mod_invites and friends to the new authz and roles. Invites with roles in the old way will need to be migrated, but with invites often being short lived it is probably not a long-lived problem.
author Kim Alvefur <zash@zash.se>
date Thu, 30 Mar 2023 11:05:40 +0200
parent 12976:a187600ec7d6
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7c4cf87f4dff util.table, Makefile: New C module that allows pre-allocation of tables to improve performance and decrease memory fragmentation
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1 #include <lua.h>
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2 #include <lauxlib.h>
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3
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4 #ifndef LUA_MAXINTEGER
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5 #include <stdint.h>
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6 #define LUA_MAXINTEGER PTRDIFF_MAX
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7 #endif
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8
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9 static int Lcreate_table(lua_State *L) {
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10 lua_createtable(L, luaL_checkinteger(L, 1), luaL_checkinteger(L, 2));
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11 return 1;
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12 }
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13
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14 /* COMPAT: w/ Lua pre-5.2 */
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15 static int Lpack(lua_State *L) {
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16 unsigned int n_args = lua_gettop(L);
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17 lua_createtable(L, n_args, 1);
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18 lua_insert(L, 1);
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19
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20 for(int arg = n_args; arg >= 1; arg--) {
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21 lua_rawseti(L, 1, arg);
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22 }
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23
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24 lua_pushinteger(L, n_args);
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25 lua_setfield(L, -2, "n");
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26 return 1;
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27 }
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28
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29 /* COMPAT: w/ Lua pre-5.4 */
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30 static int Lmove (lua_State *L) {
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31 lua_Integer f = luaL_checkinteger(L, 2);
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32 lua_Integer e = luaL_checkinteger(L, 3);
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33 lua_Integer t = luaL_checkinteger(L, 4);
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34
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35 int tt = !lua_isnoneornil(L, 5) ? 5 : 1; /* destination table */
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36 luaL_checktype(L, 1, LUA_TTABLE);
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37 luaL_checktype(L, tt, LUA_TTABLE);
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38
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39 if (e >= f) { /* otherwise, nothing to move */
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40 lua_Integer n, i;
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41 luaL_argcheck(L, f > 0 || e < LUA_MAXINTEGER + f, 3,
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42 "too many elements to move");
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43 n = e - f + 1; /* number of elements to move */
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44 luaL_argcheck(L, t <= LUA_MAXINTEGER - n + 1, 4,
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45 "destination wrap around");
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46 if (t > e || t <= f || (tt != 1 && !lua_compare(L, 1, tt, LUA_OPEQ))) {
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47 for (i = 0; i < n; i++) {
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48 lua_rawgeti(L, 1, f + i);
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49 lua_rawseti(L, tt, t + i);
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50 }
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51 } else {
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52 for (i = n - 1; i >= 0; i--) {
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53 lua_rawgeti(L, 1, f + i);
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54 lua_rawseti(L, tt, t + i);
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55 }
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56 }
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57 }
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58
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59 lua_pushvalue(L, tt); /* return destination table */
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60 return 1;
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61 }
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62
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63 int luaopen_prosody_util_table(lua_State *L) {
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64 luaL_checkversion(L);
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65 lua_createtable(L, 0, 2);
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66 lua_pushcfunction(L, Lcreate_table);
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67 lua_setfield(L, -2, "create");
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68 lua_pushcfunction(L, Lpack);
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69 lua_setfield(L, -2, "pack");
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70 lua_pushcfunction(L, Lmove);
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71 lua_setfield(L, -2, "move");
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72 return 1;
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73 }
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74
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75 int luaopen_util_table(lua_State *L) {
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76 return luaopen_prosody_util_table(L);
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77 }