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util-src/strbitop.c

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util-src/strbitop.c @ 13270:14bbfb2cc8dd default tip

lint: Teach luacheck about module:once Silence warning for using this introduced in 9c62ffbdf2ae
author Kim Alvefur <zash@zash.se>
date Sun, 15 Oct 2023 16:43:14 +0200
parent 12976:a187600ec7d6
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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
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12 /* TODO Deduplicate code somehow */
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13
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14 static int strop_and(lua_State *L) {
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15 luaL_Buffer buf;
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16 size_t a, b, i;
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17 const char *str_a = luaL_checklstring(L, 1, &a);
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18 const char *str_b = luaL_checklstring(L, 2, &b);
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19
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20 luaL_buffinit(L, &buf);
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21
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22 if(a == 0 || b == 0) {
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23 lua_settop(L, 1);
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24 return 1;
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25 }
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26
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27 for(i = 0; i < a; i++) {
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28 luaL_addchar(&buf, str_a[i] & str_b[i % b]);
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29 }
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30
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31 luaL_pushresult(&buf);
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32 return 1;
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33 }
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34
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35 static int strop_or(lua_State *L) {
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36 luaL_Buffer buf;
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37 size_t a, b, i;
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38 const char *str_a = luaL_checklstring(L, 1, &a);
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39 const char *str_b = luaL_checklstring(L, 2, &b);
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40
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41 luaL_buffinit(L, &buf);
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42
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43 if(a == 0 || b == 0) {
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44 lua_settop(L, 1);
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45 return 1;
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46 }
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47
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48 for(i = 0; i < a; i++) {
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49 luaL_addchar(&buf, str_a[i] | str_b[i % b]);
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50 }
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51
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52 luaL_pushresult(&buf);
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53 return 1;
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54 }
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55
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56 static int strop_xor(lua_State *L) {
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57 luaL_Buffer buf;
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58 size_t a, b, i;
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59 const char *str_a = luaL_checklstring(L, 1, &a);
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60 const char *str_b = luaL_checklstring(L, 2, &b);
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61
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62 luaL_buffinit(L, &buf);
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63
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64 if(a == 0 || b == 0) {
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65 lua_settop(L, 1);
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66 return 1;
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67 }
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68
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69 for(i = 0; i < a; i++) {
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70 luaL_addchar(&buf, str_a[i] ^ str_b[i % b]);
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71 }
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72
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73 luaL_pushresult(&buf);
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74 return 1;
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75 }
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76
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77 LUA_API int luaopen_prosody_util_strbitop(lua_State *L) {
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78 luaL_Reg exports[] = {
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79 { "sand", strop_and },
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80 { "sor", strop_or },
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81 { "sxor", strop_xor },
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82 { NULL, NULL }
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83 };
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84
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85 lua_newtable(L);
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86 luaL_setfuncs(L, exports, 0);
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87 return 1;
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88 }
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89
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90 LUA_API int luaopen_util_strbitop(lua_State *L) {
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91 return luaopen_prosody_util_strbitop(L);
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92 }