prosody
67311cda0625
util-src/ringbuffer.c

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util-src/ringbuffer.c @ 8528:67311cda0625

net.server_select: Better detection of errors for outgoing connections On connection failure, a socket is marked readable and writable. So to detect initial connection failures (connection refused, etc.) we now watch for sockets becoming readable during initial connection, and also read from readable sockets before writing to writable sockets. This should fix 'onconnect' being called for outgoing connections that actually failed.
author Matthew Wild <mwild1@gmail.com>
date Fri, 23 Feb 2018 15:30:00 +0000
parent 7969:1c6a07606309
child 8543:0e1d8f2f02bf
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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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b4a08a514ebc util.ringbuffer: Allocate buffer itself as part of userdata (simpler, single allocation, no need for __gc)
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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 }