prosody
9524bb7f3944
util-src/ringbuffer.c

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util-src/ringbuffer.c @ 12631:9524bb7f3944

mod_storage_sql: Drop archive timestamp precision pending schema update The "when" column is an INTEGER which will probably be unhappy about storing higher precision timestamps, so we keep the older behavior for now.
author Kim Alvefur <zash@zash.se>
date Sun, 14 Aug 2022 17:29:39 +0200
parent 12575:1f6f05a98fcd
child 12976:a187600ec7d6
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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
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6 #include <lua.h>
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7 #include <lauxlib.h>
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8
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9 #if (LUA_VERSION_NUM < 504)
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10 #define luaL_pushfail lua_pushnil
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11 #endif
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12
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13 typedef struct {
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14 size_t rpos; /* read position */
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15 size_t wpos; /* write position */
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16 size_t alen; /* allocated size */
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17 size_t blen; /* current content size */
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18 char buffer[];
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19 } ringbuffer;
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20
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21 /* Translate absolute idx to a wrapped index within the buffer,
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22 based on current read position */
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23 static int wrap_pos(const ringbuffer *b, const long idx, long *pos) {
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24 if(idx > (long)b->blen) {
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25 return 0;
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26 }
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27 if(idx + (long)b->rpos > (long)b->alen) {
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28 *pos = idx - (b->alen - b->rpos);
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29 } else {
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30 *pos = b->rpos + idx;
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31 }
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32 return 1;
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33 }
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34
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35 static int calc_splice_positions(const ringbuffer *b, long start, long end, long *out_start, long *out_end) {
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36 if(start < 0) {
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37 start = 1 + start + b->blen;
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38 }
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39 if(start <= 0) {
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40 start = 1;
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41 }
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42
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43 if(end < 0) {
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44 end = 1 + end + b->blen;
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45 }
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46
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47 if(end > (long)b->blen) {
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48 end = b->blen;
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49 }
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50 if(start < 1) {
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51 start = 1;
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52 }
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53
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54 if(start > end) {
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55 return 0;
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56 }
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57
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58 start = start - 1;
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59
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60 if(!wrap_pos(b, start, out_start)) {
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61 return 0;
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62 }
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63 if(!wrap_pos(b, end, out_end)) {
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64 return 0;
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65 }
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66
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67 return 1;
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68 }
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69
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70 static void writechar(ringbuffer *b, char c) {
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71 b->blen++;
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72 b->buffer[(b->wpos++) % b->alen] = c;
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73 }
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74
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75 /* make sure position counters stay within the allocation */
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76 static void modpos(ringbuffer *b) {
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77 b->rpos = b->rpos % b->alen;
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78 b->wpos = b->wpos % b->alen;
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79 }
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80
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81 static int find(ringbuffer *b, const char *s, size_t l) {
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82 size_t i, j;
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83 int m;
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84
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85 if(b->rpos == b->wpos) { /* empty */
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86 return 0;
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87 }
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88
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89 /* look for a matching first byte */
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90 for(i = 0; i <= b->blen - l; i++) {
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91 if(b->buffer[(b->rpos + i) % b->alen] == *s) {
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92 m = 1;
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93
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94 /* check if the following byte also match */
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95 for(j = 1; j < l; j++)
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96 if(b->buffer[(b->rpos + i + j) % b->alen] != s[j]) {
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97 m = 0;
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98 break;
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99 }
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100
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101 if(m) {
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102 return i + l;
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103 }
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104 }
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105 }
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106
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107 return 0;
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108 }
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109
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110 /*
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111 * Find first position of a substring in buffer
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112 * (buffer, string) -> number
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113 */
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114 static int rb_find(lua_State *L) {
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115 size_t l, m;
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116 ringbuffer *b = luaL_checkudata(L, 1, "ringbuffer_mt");
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117 const char *s = luaL_checklstring(L, 2, &l);
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118 m = find(b, s, l);
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119
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120 if(m > 0) {
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121 lua_pushinteger(L, m);
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122 return 1;
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123 }
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124
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125 return 0;
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126 }
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127
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128 /*
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129 * Move read position forward without returning the data
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130 * (buffer, number) -> boolean
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131 */
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132 static int rb_discard(lua_State *L) {
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133 ringbuffer *b = luaL_checkudata(L, 1, "ringbuffer_mt");
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134 size_t r = luaL_checkinteger(L, 2);
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135
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136 if(r > b->blen) {
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137 lua_pushboolean(L, 0);
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138 return 1;
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139 }
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140
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141 b->blen -= r;
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142 b->rpos += r;
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143 modpos(b);
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144
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145 lua_pushboolean(L, 1);
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146 return 1;
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147 }
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148
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149 /*
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150 * Read bytes from buffer
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151 * (buffer, number, boolean?) -> string
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152 */
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153 static int rb_read(lua_State *L) {
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154 ringbuffer *b = luaL_checkudata(L, 1, "ringbuffer_mt");
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155 size_t r = luaL_checkinteger(L, 2);
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156 int peek = lua_toboolean(L, 3);
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157
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158 if(r > b->blen) {
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159 luaL_pushfail(L);
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160 return 1;
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161 }
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162
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163 if((b->rpos + r) > b->alen) {
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164 /* Substring wraps around to the beginning of the buffer */
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165 lua_pushlstring(L, &b->buffer[b->rpos], b->alen - b->rpos);
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166 lua_pushlstring(L, b->buffer, r - (b->alen - b->rpos));
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167 lua_concat(L, 2);
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168 } else {
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169 lua_pushlstring(L, &b->buffer[b->rpos], r);
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170 }
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171
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172 if(!peek) {
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173 b->blen -= r;
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174 b->rpos += r;
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175 modpos(b);
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176 }
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177
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178 return 1;
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179 }
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180
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181 /*
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182 * Read buffer until first occurrence of a substring
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183 * (buffer, string) -> string
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184 */
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185 static int rb_readuntil(lua_State *L) {
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186 size_t l, m;
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187 ringbuffer *b = luaL_checkudata(L, 1, "ringbuffer_mt");
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188 const char *s = luaL_checklstring(L, 2, &l);
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189 m = find(b, s, l);
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190
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191 if(m > 0) {
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192 lua_settop(L, 1);
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193 lua_pushinteger(L, m);
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194 return rb_read(L);
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195 }
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196
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197 return 0;
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198 }
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199
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200 /*
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201 * Write bytes into the buffer
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202 * (buffer, string) -> integer
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203 */
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204 static int rb_write(lua_State *L) {
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205 size_t l, w = 0;
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206 ringbuffer *b = luaL_checkudata(L, 1, "ringbuffer_mt");
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207 const char *s = luaL_checklstring(L, 2, &l);
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208
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209 /* Does `l` bytes fit? */
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210 if((l + b->blen) > b->alen) {
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211 luaL_pushfail(L);
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212 return 1;
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213 }
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214
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215 while(l-- > 0) {
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216 writechar(b, *s++);
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217 w++;
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218 }
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219
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220 modpos(b);
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221
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222 lua_pushinteger(L, w);
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223
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224 return 1;
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225 }
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226
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227 static int rb_tostring(lua_State *L) {
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228 ringbuffer *b = luaL_checkudata(L, 1, "ringbuffer_mt");
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229 lua_pushfstring(L, "ringbuffer: %p %d/%d", b, b->blen, b->alen);
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230 return 1;
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231 }
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232
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233 static int rb_sub(lua_State *L) {
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234 ringbuffer *b = luaL_checkudata(L, 1, "ringbuffer_mt");
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235
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236 long start = luaL_checkinteger(L, 2);
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237 long end = luaL_optinteger(L, 3, -1);
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238
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239 long wrapped_start, wrapped_end;
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240 if(!calc_splice_positions(b, start, end, &wrapped_start, &wrapped_end)) {
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241 lua_pushstring(L, "");
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242 } else if(wrapped_end <= wrapped_start) {
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243 lua_pushlstring(L, &b->buffer[wrapped_start], b->alen - wrapped_start);
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244 lua_pushlstring(L, b->buffer, wrapped_end);
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245 lua_concat(L, 2);
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246 } else {
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247 lua_pushlstring(L, &b->buffer[wrapped_start], (wrapped_end - wrapped_start));
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248 }
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249
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250 return 1;
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251 }
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252
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253 static int rb_byte(lua_State *L) {
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254 ringbuffer *b = luaL_checkudata(L, 1, "ringbuffer_mt");
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255
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256 long start = luaL_optinteger(L, 2, 1);
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257 long end = luaL_optinteger(L, 3, start);
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258
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259 long i;
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260
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261 long wrapped_start, wrapped_end;
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262 if(calc_splice_positions(b, start, end, &wrapped_start, &wrapped_end)) {
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parents: 10899
diff changeset
263 if(wrapped_end <= wrapped_start) {
5e33926f4b43 util.ringbuffer: Add :sub() and :byte() methods equivalent to the string methods
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parents: 10899
diff changeset
264 for(i = wrapped_start; i < (long)b->alen; i++) {
10953
c3b3ac63f4c3 util.ringbuffer: Ensure unsigned chars are always returned from :byte()
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parents: 10921
diff changeset
265 lua_pushinteger(L, (unsigned char)b->buffer[i]);
10901
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266 }
5e33926f4b43 util.ringbuffer: Add :sub() and :byte() methods equivalent to the string methods
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diff changeset
267 for(i = 0; i < wrapped_end; i++) {
10953
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diff changeset
268 lua_pushinteger(L, (unsigned char)b->buffer[i]);
10901
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269 }
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diff changeset
270 return wrapped_end + (b->alen - wrapped_start);
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271 } else {
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diff changeset
272 for(i = wrapped_start; i < wrapped_end; i++) {
10953
c3b3ac63f4c3 util.ringbuffer: Ensure unsigned chars are always returned from :byte()
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diff changeset
273 lua_pushinteger(L, (unsigned char)b->buffer[i]);
10901
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274 }
5e33926f4b43 util.ringbuffer: Add :sub() and :byte() methods equivalent to the string methods
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275 return wrapped_end - wrapped_start;
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276 }
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diff changeset
277 }
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Matthew Wild <mwild1@gmail.com>
parents: 10899
diff changeset
278
5e33926f4b43 util.ringbuffer: Add :sub() and :byte() methods equivalent to the string methods
Matthew Wild <mwild1@gmail.com>
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diff changeset
279 return 0;
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diff changeset
280 }
5e33926f4b43 util.ringbuffer: Add :sub() and :byte() methods equivalent to the string methods
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diff changeset
281
10480
94cacf9fd0ae util.*.c: Add static qualifiers everywhere
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 8735
diff changeset
282 static int rb_length(lua_State *L) {
7889
b8d694646597 util-src/*.c: Attach pointer * to name instead of type
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parents: 7888
diff changeset
283 ringbuffer *b = luaL_checkudata(L, 1, "ringbuffer_mt");
7117
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284 lua_pushinteger(L, b->blen);
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285 return 1;
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parents:
diff changeset
286 }
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287
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 8735
diff changeset
288 static int rb_size(lua_State *L) {
7889
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289 ringbuffer *b = luaL_checkudata(L, 1, "ringbuffer_mt");
7117
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290 lua_pushinteger(L, b->alen);
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291 return 1;
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parents:
diff changeset
292 }
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293
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 8735
diff changeset
294 static int rb_free(lua_State *L) {
7889
b8d694646597 util-src/*.c: Attach pointer * to name instead of type
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295 ringbuffer *b = luaL_checkudata(L, 1, "ringbuffer_mt");
7117
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296 lua_pushinteger(L, b->alen - b->blen);
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297 return 1;
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parents:
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298 }
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299
10480
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 8735
diff changeset
300 static int rb_new(lua_State *L) {
10899
8048255ae61e util.ringbuffer: Prevent creation of buffer with negative size
Kim Alvefur <zash@zash.se>
parents: 10898
diff changeset
301 lua_Integer size = luaL_optinteger(L, 1, sysconf(_SC_PAGESIZE));
10898
c6465fb3c839 util.ringbuffer: Prevent creation of zero-size buffer
Kim Alvefur <zash@zash.se>
parents: 10480
diff changeset
302 luaL_argcheck(L, size > 0, 1, "positive integer expected");
7828
b4a08a514ebc util.ringbuffer: Allocate buffer itself as part of userdata (simpler, single allocation, no need for __gc)
Kim Alvefur <zash@zash.se>
parents: 7827
diff changeset
303 ringbuffer *b = lua_newuserdata(L, sizeof(ringbuffer) + size);
b4a08a514ebc util.ringbuffer: Allocate buffer itself as part of userdata (simpler, single allocation, no need for __gc)
Kim Alvefur <zash@zash.se>
parents: 7827
diff changeset
304
7117
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parents:
diff changeset
305 b->rpos = 0;
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
306 b->wpos = 0;
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
307 b->alen = size;
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
308 b->blen = 0;
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
309
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
310 luaL_getmetatable(L, "ringbuffer_mt");
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
311 lua_setmetatable(L, -2);
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
312
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
313 return 1;
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
314 }
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
315
7889
b8d694646597 util-src/*.c: Attach pointer * to name instead of type
Kim Alvefur <zash@zash.se>
parents: 7888
diff changeset
316 int luaopen_util_ringbuffer(lua_State *L) {
7818
54669df178c2 util-src: Make C modules assert that the Lua runtime matches what it was compiled for
Kim Alvefur <zash@zash.se>
parents: 7117
diff changeset
317 luaL_checkversion(L);
7889
b8d694646597 util-src/*.c: Attach pointer * to name instead of type
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parents: 7888
diff changeset
318
7117
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parents:
diff changeset
319 if(luaL_newmetatable(L, "ringbuffer_mt")) {
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
320 lua_pushcfunction(L, rb_tostring);
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
321 lua_setfield(L, -2, "__tostring");
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
322 lua_pushcfunction(L, rb_length);
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
323 lua_setfield(L, -2, "__len");
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
324
7969
1c6a07606309 util-src: Specify size of various tables to be allocated
Kim Alvefur <zash@zash.se>
parents: 7941
diff changeset
325 lua_createtable(L, 0, 7); /* __index */
7117
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
326 {
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
327 lua_pushcfunction(L, rb_find);
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
328 lua_setfield(L, -2, "find");
8544
e7214441523b util.ringbuffer: Add method for discarding buffered data without returning it to lua
Kim Alvefur <zash@zash.se>
parents: 8543
diff changeset
329 lua_pushcfunction(L, rb_discard);
e7214441523b util.ringbuffer: Add method for discarding buffered data without returning it to lua
Kim Alvefur <zash@zash.se>
parents: 8543
diff changeset
330 lua_setfield(L, -2, "discard");
7117
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
331 lua_pushcfunction(L, rb_read);
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
332 lua_setfield(L, -2, "read");
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
333 lua_pushcfunction(L, rb_readuntil);
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
334 lua_setfield(L, -2, "readuntil");
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
335 lua_pushcfunction(L, rb_write);
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
336 lua_setfield(L, -2, "write");
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
337 lua_pushcfunction(L, rb_size);
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
338 lua_setfield(L, -2, "size");
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
339 lua_pushcfunction(L, rb_length);
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
340 lua_setfield(L, -2, "length");
10901
5e33926f4b43 util.ringbuffer: Add :sub() and :byte() methods equivalent to the string methods
Matthew Wild <mwild1@gmail.com>
parents: 10899
diff changeset
341 lua_pushcfunction(L, rb_sub);
5e33926f4b43 util.ringbuffer: Add :sub() and :byte() methods equivalent to the string methods
Matthew Wild <mwild1@gmail.com>
parents: 10899
diff changeset
342 lua_setfield(L, -2, "sub");
5e33926f4b43 util.ringbuffer: Add :sub() and :byte() methods equivalent to the string methods
Matthew Wild <mwild1@gmail.com>
parents: 10899
diff changeset
343 lua_pushcfunction(L, rb_byte);
5e33926f4b43 util.ringbuffer: Add :sub() and :byte() methods equivalent to the string methods
Matthew Wild <mwild1@gmail.com>
parents: 10899
diff changeset
344 lua_setfield(L, -2, "byte");
7117
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
345 lua_pushcfunction(L, rb_free);
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
346 lua_setfield(L, -2, "free");
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
347 }
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
348 lua_setfield(L, -2, "__index");
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
349 }
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
350
7969
1c6a07606309 util-src: Specify size of various tables to be allocated
Kim Alvefur <zash@zash.se>
parents: 7941
diff changeset
351 lua_createtable(L, 0, 1);
7117
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
352 lua_pushcfunction(L, rb_new);
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
353 lua_setfield(L, -2, "new");
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
354 return 1;
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
355 }