prosody
81f894d08b17
util-src/ringbuffer.c

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util-src/ringbuffer.c @ 8470:81f894d08b17

mod_storage_sql: Remove ability to override name of key-value table (unreachable and would not work)
author Kim Alvefur <zash@zash.se>
date Mon, 11 Dec 2017 22:45:03 +0100
parent 7969:1c6a07606309
child 8543:0e1d8f2f02bf
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1
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2 #include <stdlib.h>
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3 #include <unistd.h>
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4 #include <string.h>
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5 #include <stdio.h>
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6
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7 #include <lua.h>
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8 #include <lauxlib.h>
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9
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10 typedef struct {
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11 size_t rpos; /* read position */
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12 size_t wpos; /* write position */
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13 size_t alen; /* allocated size */
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14 size_t blen; /* current content size */
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15 char buffer[];
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16 } ringbuffer;
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17
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18 char readchar(ringbuffer *b) {
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19 b->blen--;
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20 return b->buffer[(b->rpos++) % b->alen];
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21 }
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22
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23 void writechar(ringbuffer *b, char c) {
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24 b->blen++;
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25 b->buffer[(b->wpos++) % b->alen] = c;
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26 }
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27
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28 /* make sure position counters stay within the allocation */
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29 void modpos(ringbuffer *b) {
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30 b->rpos = b->rpos % b->alen;
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31 b->wpos = b->wpos % b->alen;
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32 }
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33
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34 int find(ringbuffer *b, const char *s, size_t l) {
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35 size_t i, j;
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36 int m;
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37
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38 if(b->rpos == b->wpos) { /* empty */
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39 return 0;
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40 }
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41
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42 for(i = 0; i <= b->blen - l; i++) {
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43 if(b->buffer[(b->rpos + i) % b->alen] == *s) {
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44 m = 1;
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45
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46 for(j = 1; j < l; j++)
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47 if(b->buffer[(b->rpos + i + j) % b->alen] != s[j]) {
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48 m = 0;
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49 break;
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50 }
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51
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52 if(m) {
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53 return i + l;
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54 }
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55 }
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56 }
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57
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58 return 0;
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59 }
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60
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61 int rb_find(lua_State *L) {
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62 size_t l, m;
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63 ringbuffer *b = luaL_checkudata(L, 1, "ringbuffer_mt");
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64 const char *s = luaL_checklstring(L, 2, &l);
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65 m = find(b, s, l);
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66
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67 if(m > 0) {
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68 lua_pushinteger(L, m);
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69 return 1;
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70 }
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71
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72 return 0;
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73 }
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74
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75 int rb_read(lua_State *L) {
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76 ringbuffer *b = luaL_checkudata(L, 1, "ringbuffer_mt");
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77 size_t r = luaL_checkinteger(L, 2);
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78 int peek = lua_toboolean(L, 3);
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79
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80 if(r > b->blen) {
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81 lua_pushnil(L);
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82 return 1;
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83 }
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84
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85 if((b->rpos + r) > b->alen) {
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86 lua_pushlstring(L, &b->buffer[b->rpos], b->alen - b->rpos);
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87 lua_pushlstring(L, b->buffer, r - (b->alen - b->rpos));
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88 lua_concat(L, 2);
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89 } else {
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90 lua_pushlstring(L, &b->buffer[b->rpos], r);
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91 }
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92
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93 if(!peek) {
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94 b->blen -= r;
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95 b->rpos += r;
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96 modpos(b);
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97 }
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98
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99 return 1;
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100 }
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101
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102 int rb_readuntil(lua_State *L) {
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103 size_t l, m;
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104 ringbuffer *b = luaL_checkudata(L, 1, "ringbuffer_mt");
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105 const char *s = luaL_checklstring(L, 2, &l);
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106 m = find(b, s, l);
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107
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108 if(m > 0) {
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109 lua_settop(L, 1);
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110 lua_pushinteger(L, m);
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111 return rb_read(L);
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112 }
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113
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114 return 0;
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115 }
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116
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117 int rb_write(lua_State *L) {
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118 size_t l, w = 0;
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119 ringbuffer *b = luaL_checkudata(L, 1, "ringbuffer_mt");
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120 const char *s = luaL_checklstring(L, 2, &l);
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121
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122 /* Does `l` bytes fit? */
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123 if((l + b->blen) > b->alen) {
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124 lua_pushnil(L);
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125 return 1;
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126 }
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127
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128 while(l-- > 0) {
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129 writechar(b, *s++);
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130 w++;
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131 }
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132
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133 modpos(b);
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134
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135 lua_pushinteger(L, w);
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136
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137 return 1;
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138 }
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139
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140 int rb_tostring(lua_State *L) {
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141 ringbuffer *b = luaL_checkudata(L, 1, "ringbuffer_mt");
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142 lua_pushfstring(L, "ringbuffer: %p %d/%d", b, b->blen, b->alen);
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143 return 1;
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144 }
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145
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146 int rb_length(lua_State *L) {
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147 ringbuffer *b = luaL_checkudata(L, 1, "ringbuffer_mt");
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148 lua_pushinteger(L, b->blen);
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149 return 1;
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150 }
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151
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152 int rb_size(lua_State *L) {
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153 ringbuffer *b = luaL_checkudata(L, 1, "ringbuffer_mt");
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154 lua_pushinteger(L, b->alen);
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155 return 1;
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156 }
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157
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158 int rb_free(lua_State *L) {
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159 ringbuffer *b = luaL_checkudata(L, 1, "ringbuffer_mt");
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160 lua_pushinteger(L, b->alen - b->blen);
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161 return 1;
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162 }
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163
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164 int rb_new(lua_State *L) {
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165 size_t size = luaL_optinteger(L, 1, sysconf(_SC_PAGESIZE));
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166 ringbuffer *b = lua_newuserdata(L, sizeof(ringbuffer) + size);
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167
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168 b->rpos = 0;
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169 b->wpos = 0;
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170 b->alen = size;
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171 b->blen = 0;
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172
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173 luaL_getmetatable(L, "ringbuffer_mt");
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174 lua_setmetatable(L, -2);
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175
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176 return 1;
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177 }
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178
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179 int luaopen_util_ringbuffer(lua_State *L) {
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180 #if (LUA_VERSION_NUM > 501)
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181 luaL_checkversion(L);
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182 #endif
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183
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184 if(luaL_newmetatable(L, "ringbuffer_mt")) {
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185 lua_pushcfunction(L, rb_tostring);
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186 lua_setfield(L, -2, "__tostring");
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187 lua_pushcfunction(L, rb_length);
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188 lua_setfield(L, -2, "__len");
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189
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190 lua_createtable(L, 0, 7); /* __index */
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191 {
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192 lua_pushcfunction(L, rb_find);
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193 lua_setfield(L, -2, "find");
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194 lua_pushcfunction(L, rb_read);
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195 lua_setfield(L, -2, "read");
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196 lua_pushcfunction(L, rb_readuntil);
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197 lua_setfield(L, -2, "readuntil");
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198 lua_pushcfunction(L, rb_write);
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199 lua_setfield(L, -2, "write");
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200 lua_pushcfunction(L, rb_size);
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201 lua_setfield(L, -2, "size");
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202 lua_pushcfunction(L, rb_length);
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203 lua_setfield(L, -2, "length");
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204 lua_pushcfunction(L, rb_free);
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205 lua_setfield(L, -2, "free");
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206 }
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207 lua_setfield(L, -2, "__index");
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208 }
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209
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210 lua_createtable(L, 0, 1);
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211 lua_pushcfunction(L, rb_new);
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212 lua_setfield(L, -2, "new");
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213 return 1;
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214 }