prosody
eca44e058eed
util-src/strbitop.c

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util-src/strbitop.c @ 13196:eca44e058eed

util.human.io: Use tail call in test to get correct line numbers This is probably not guaranteed to work and might vary with Lua version, but it's good enough for me to get accurate line numbers out of Busted that don't all point to the test() function.
author Kim Alvefur <zash@zash.se>
date Sun, 16 Jul 2023 18:42:58 +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 }