prosody
712b2e6a09d9
util-src/strbitop.c

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util-src/strbitop.c @ 11172:712b2e6a09d9 0.11

Back out 6dde2c9fa272: Doesn't work on Lua 5.1
author Kim Alvefur <zash@zash.se>
date Thu, 15 Oct 2020 17:12:33 +0200
parent 11171:2c1583bb0e0f
child 11175:235537247aa3
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 if(a == 0 || b == 0) {
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24 lua_settop(L, 1);
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25 return 1;
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26 }
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27
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28 for(i = 0; i < a; i++) {
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29 luaL_addchar(&buf, str_a[i] & str_b[i % b]);
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30 }
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31
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32 luaL_pushresult(&buf);
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33 return 1;
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34 }
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35
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36 int strop_or(lua_State *L) {
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37 luaL_Buffer buf;
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38 size_t a, b, i;
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39 const char *str_a = luaL_checklstring(L, 1, &a);
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40 const char *str_b = luaL_checklstring(L, 2, &b);
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41
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42 if(a == 0 || b == 0) {
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43 lua_settop(L, 1);
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44 return 1;
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45 }
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46
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47 for(i = 0; i < a; i++) {
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48 luaL_addchar(&buf, str_a[i] | str_b[i % b]);
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49 }
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50
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51 luaL_pushresult(&buf);
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52 return 1;
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53 }
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54
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55 int strop_xor(lua_State *L) {
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56 luaL_Buffer buf;
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57 size_t a, b, i;
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58 const char *str_a = luaL_checklstring(L, 1, &a);
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59 const char *str_b = luaL_checklstring(L, 2, &b);
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60
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61 luaL_buffinit(L, &buf);
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62
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63 if(a == 0 || b == 0) {
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64 lua_settop(L, 1);
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65 return 1;
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66 }
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67
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68 for(i = 0; i < a; i++) {
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69 luaL_addchar(&buf, str_a[i] ^ str_b[i % b]);
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70 }
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71
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72 luaL_pushresult(&buf);
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73 return 1;
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74 }
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75
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76 LUA_API int luaopen_util_strbitop(lua_State *L) {
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77 luaL_Reg exports[] = {
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78 { "sand", strop_and },
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79 { "sor", strop_or },
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80 { "sxor", strop_xor },
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81 { NULL, NULL }
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82 };
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83
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84 lua_newtable(L);
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85 luaL_setfuncs(L, exports, 0);
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86 return 1;
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87 }