prosody
48f8fa6cea7b
util-src/strbitop.c

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util-src/strbitop.c @ 12043:48f8fa6cea7b

mod_smacks: Back out a86ae74da96c: Fixed one problem, caused another As per a86ae74da96c the 'session' object here is the wrong session, so the attempt to block stanzas from being added to the queue twice did not work causing something of a leak. Instead we have a leak of the previous session.
author Kim Alvefur <zash@zash.se>
date Mon, 13 Dec 2021 21:17:54 +0100
parent 11175:235537247aa3
child 12469:2b3adaa6d38e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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37a6a535343e util.strbitop: Library for bitwise operations on strings
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1 /*
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2 * This project is MIT licensed. Please see the
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3 * COPYING file in the source package for more information.
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4 *
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5 * Copyright (C) 2016 Kim Alvefur
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6 */
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7
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8 #include <lua.h>
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9 #include <lauxlib.h>
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10
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11 #if (LUA_VERSION_NUM == 501)
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12 #define luaL_setfuncs(L, R, N) luaL_register(L, NULL, R)
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13 #endif
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14
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15 /* TODO Deduplicate code somehow */
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16
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17 int strop_and(lua_State *L) {
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18 luaL_Buffer buf;
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19 size_t a, b, i;
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20 const char *str_a = luaL_checklstring(L, 1, &a);
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21 const char *str_b = luaL_checklstring(L, 2, &b);
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22
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23 luaL_buffinit(L, &buf);
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24
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25 if(a == 0 || b == 0) {
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26 lua_settop(L, 1);
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27 return 1;
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28 }
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29
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30 for(i = 0; i < a; i++) {
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31 luaL_addchar(&buf, str_a[i] & str_b[i % b]);
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32 }
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33
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34 luaL_pushresult(&buf);
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35 return 1;
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36 }
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37
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38 int strop_or(lua_State *L) {
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39 luaL_Buffer buf;
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40 size_t a, b, i;
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41 const char *str_a = luaL_checklstring(L, 1, &a);
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42 const char *str_b = luaL_checklstring(L, 2, &b);
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43
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44 luaL_buffinit(L, &buf);
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45
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46 if(a == 0 || b == 0) {
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47 lua_settop(L, 1);
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48 return 1;
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49 }
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50
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51 for(i = 0; i < a; i++) {
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52 luaL_addchar(&buf, str_a[i] | str_b[i % b]);
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53 }
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54
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55 luaL_pushresult(&buf);
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56 return 1;
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57 }
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58
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59 int strop_xor(lua_State *L) {
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60 luaL_Buffer buf;
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61 size_t a, b, i;
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62 const char *str_a = luaL_checklstring(L, 1, &a);
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63 const char *str_b = luaL_checklstring(L, 2, &b);
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64
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65 luaL_buffinit(L, &buf);
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66
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67 if(a == 0 || b == 0) {
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68 lua_settop(L, 1);
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69 return 1;
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70 }
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71
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72 for(i = 0; i < a; i++) {
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73 luaL_addchar(&buf, str_a[i] ^ str_b[i % b]);
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74 }
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75
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76 luaL_pushresult(&buf);
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77 return 1;
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78 }
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79
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80 LUA_API int luaopen_util_strbitop(lua_State *L) {
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81 luaL_Reg exports[] = {
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82 { "sand", strop_and },
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83 { "sor", strop_or },
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84 { "sxor", strop_xor },
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85 { NULL, NULL }
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86 };
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87
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88 lua_newtable(L);
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89 luaL_setfuncs(L, exports, 0);
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90 return 1;
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91 }