prosody
05c250fa335a
util-src/ringbuffer.c

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util-src/ringbuffer.c @ 12387:05c250fa335a

Spelling: Fix various spelling mistakes (thanks timeless) Words, sometimes I wonder how they even work Maybe I missed something.
author Kim Alvefur <zash@zash.se>
date Mon, 07 Mar 2022 00:13:56 +0100
parent 10953:c3b3ac63f4c3
child 12575:1f6f05a98fcd
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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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diff changeset
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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diff changeset
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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diff changeset
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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diff changeset
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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diff changeset
259 long i;
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260
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diff changeset
261 long wrapped_start, wrapped_end;
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diff changeset
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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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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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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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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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
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273 lua_pushinteger(L, (unsigned char)b->buffer[i]);
10901
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274 }
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275 return wrapped_end - wrapped_start;
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276 }
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277 }
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278
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279 return 0;
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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>
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282 static int rb_length(lua_State *L) {
7889
b8d694646597 util-src/*.c: Attach pointer * to name instead of type
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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>
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288 static int rb_size(lua_State *L) {
7889
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289 ringbuffer *b = luaL_checkudata(L, 1, "ringbuffer_mt");
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290 lua_pushinteger(L, b->alen);
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291 return 1;
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parents:
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292 }
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293
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294 static int rb_free(lua_State *L) {
7889
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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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298 }
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299
10480
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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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Kim Alvefur <zash@zash.se>
parents:
diff changeset
305 b->rpos = 0;
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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;
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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");
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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
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diff changeset
313 return 1;
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
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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
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Kim Alvefur <zash@zash.se>
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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 #if (LUA_VERSION_NUM > 501)
54669df178c2 util-src: Make C modules assert that the Lua runtime matches what it was compiled for
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diff changeset
318 luaL_checkversion(L);
54669df178c2 util-src: Make C modules assert that the Lua runtime matches what it was compiled for
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diff changeset
319 #endif
7889
b8d694646597 util-src/*.c: Attach pointer * to name instead of type
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diff changeset
320
7117
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parents:
diff changeset
321 if(luaL_newmetatable(L, "ringbuffer_mt")) {
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
322 lua_pushcfunction(L, rb_tostring);
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
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parents:
diff changeset
323 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
324 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
325 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
326
7969
1c6a07606309 util-src: Specify size of various tables to be allocated
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parents: 7941
diff changeset
327 lua_createtable(L, 0, 7); /* __index */
7117
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parents:
diff changeset
328 {
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
329 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
330 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
331 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
332 lua_setfield(L, -2, "discard");
7117
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
333 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
334 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
335 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
336 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
337 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
338 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
339 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
340 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
341 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
342 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
343 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
344 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
345 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
346 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
347 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
348 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
349 }
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
350 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
351 }
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
352
7969
1c6a07606309 util-src: Specify size of various tables to be allocated
Kim Alvefur <zash@zash.se>
parents: 7941
diff changeset
353 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
354 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
355 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
356 return 1;
2b4432cc9c29 Add util.ringbuffer, a ringbuffer with a file handle like interface
Kim Alvefur <zash@zash.se>
parents:
diff changeset
357 }