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c3fb802f9e45
util-src/strbitop.c

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util-src/strbitop.c @ 11491:c3fb802f9e45

mod_http_file_share: Report number of items in caches to statsmanager This is neat, O(1) reporting, why don't we do this everywhere? Gives you an idea of how much stuff is in the caches, which may help inform decisions on whether the size is appropriate.
author Kim Alvefur <zash@zash.se>
date Sun, 28 Mar 2021 13:15:11 +0200
parent 11175:235537247aa3
child 12469:2b3adaa6d38e
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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 }