prosody
d4f7118d1531
util-src/table.c

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util-src/table.c @ 13043:d4f7118d1531

mod_admin_shell: Make IP column thinner if IPv6 is disabled IPv6 addresses can be pretty long, so if they can be more compact, that's nice. But nobody would disable IPv6, would they?
author Kim Alvefur <zash@zash.se>
date Fri, 07 Apr 2023 13:09:00 +0200
parent 12976:a187600ec7d6
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 }