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annotate third_party/luajit/src/lj_buf.h @ 212:84826b3c655b

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[MrJuneJune] Forgot to add assets.
author MrJuneJune <me@mrjunejune.com>
date Sun, 15 Feb 2026 21:38:36 -0800
parents 94705b5986b3
children
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rev   line source
178
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1 /*
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2 ** Buffer handling.
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3 ** Copyright (C) 2005-2023 Mike Pall. See Copyright Notice in luajit.h
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4 */
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5
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6 #ifndef _LJ_BUF_H
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7 #define _LJ_BUF_H
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8
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9 #include "lj_obj.h"
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10 #include "lj_gc.h"
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11 #include "lj_str.h"
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12
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13 /* Resizable string buffers. */
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14
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15 /* The SBuf struct definition is in lj_obj.h:
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16 ** char *w; Write pointer.
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17 ** char *e; End pointer.
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18 ** char *b; Base pointer.
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19 ** MRef L; lua_State, used for buffer resizing. Extension bits in 3 LSB.
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20 */
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21
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22 /* Extended string buffer. */
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23 typedef struct SBufExt {
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24 SBufHeader;
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25 union {
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26 GCRef cowref; /* Copy-on-write object reference. */
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27 MRef bsb; /* Borrowed string buffer. */
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28 };
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29 char *r; /* Read pointer. */
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30 GCRef dict_str; /* Serialization string dictionary table. */
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31 GCRef dict_mt; /* Serialization metatable dictionary table. */
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32 int depth; /* Remaining recursion depth. */
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33 } SBufExt;
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34
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35 #define sbufsz(sb) ((MSize)((sb)->e - (sb)->b))
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36 #define sbuflen(sb) ((MSize)((sb)->w - (sb)->b))
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37 #define sbufleft(sb) ((MSize)((sb)->e - (sb)->w))
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38 #define sbufxlen(sbx) ((MSize)((sbx)->w - (sbx)->r))
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39 #define sbufxslack(sbx) ((MSize)((sbx)->r - (sbx)->b))
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40
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41 #define SBUF_MASK_FLAG (7)
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42 #define SBUF_MASK_L (~(GCSize)SBUF_MASK_FLAG)
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43 #define SBUF_FLAG_EXT 1 /* Extended string buffer. */
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44 #define SBUF_FLAG_COW 2 /* Copy-on-write buffer. */
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45 #define SBUF_FLAG_BORROW 4 /* Borrowed string buffer. */
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46
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47 #define sbufL(sb) \
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48 ((lua_State *)(void *)(uintptr_t)(mrefu((sb)->L) & SBUF_MASK_L))
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49 #define setsbufL(sb, l) (setmref((sb)->L, (l)))
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50 #define setsbufXL(sb, l, flag) \
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51 (setmrefu((sb)->L, (GCSize)(uintptr_t)(void *)(l) + (flag)))
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52 #define setsbufXL_(sb, l) \
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53 (setmrefu((sb)->L, (GCSize)(uintptr_t)(void *)(l) | (mrefu((sb)->L) & SBUF_MASK_FLAG)))
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54
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55 #define sbufflag(sb) (mrefu((sb)->L))
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56 #define sbufisext(sb) (sbufflag((sb)) & SBUF_FLAG_EXT)
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57 #define sbufiscow(sb) (sbufflag((sb)) & SBUF_FLAG_COW)
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58 #define sbufisborrow(sb) (sbufflag((sb)) & SBUF_FLAG_BORROW)
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59 #define sbufiscoworborrow(sb) (sbufflag((sb)) & (SBUF_FLAG_COW|SBUF_FLAG_BORROW))
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60 #define sbufX(sb) \
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61 (lj_assertG_(G(sbufL(sb)), sbufisext(sb), "not an SBufExt"), (SBufExt *)(sb))
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62 #define setsbufflag(sb, flag) (setmrefu((sb)->L, (flag)))
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63
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64 #define tvisbuf(o) \
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65 (LJ_HASBUFFER && tvisudata(o) && udataV(o)->udtype == UDTYPE_BUFFER)
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66 #define bufV(o) check_exp(tvisbuf(o), ((SBufExt *)uddata(udataV(o))))
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67
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68 /* Buffer management */
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69 LJ_FUNC char *LJ_FASTCALL lj_buf_need2(SBuf *sb, MSize sz);
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70 LJ_FUNC char *LJ_FASTCALL lj_buf_more2(SBuf *sb, MSize sz);
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71 LJ_FUNC void LJ_FASTCALL lj_buf_shrink(lua_State *L, SBuf *sb);
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72 LJ_FUNC char * LJ_FASTCALL lj_buf_tmp(lua_State *L, MSize sz);
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73
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74 static LJ_AINLINE void lj_buf_init(lua_State *L, SBuf *sb)
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75 {
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76 setsbufL(sb, L);
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77 sb->w = sb->e = sb->b = NULL;
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78 }
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79
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80 static LJ_AINLINE void lj_buf_reset(SBuf *sb)
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81 {
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82 sb->w = sb->b;
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83 }
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84
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85 static LJ_AINLINE SBuf *lj_buf_tmp_(lua_State *L)
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86 {
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87 SBuf *sb = &G(L)->tmpbuf;
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88 setsbufL(sb, L);
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89 lj_buf_reset(sb);
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90 return sb;
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91 }
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92
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93 static LJ_AINLINE void lj_buf_free(global_State *g, SBuf *sb)
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94 {
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95 lj_assertG(!sbufisext(sb), "bad free of SBufExt");
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96 lj_mem_free(g, sb->b, sbufsz(sb));
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97 }
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98
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99 static LJ_AINLINE char *lj_buf_need(SBuf *sb, MSize sz)
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100 {
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101 if (LJ_UNLIKELY(sz > sbufsz(sb)))
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102 return lj_buf_need2(sb, sz);
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103 return sb->b;
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104 }
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105
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106 static LJ_AINLINE char *lj_buf_more(SBuf *sb, MSize sz)
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107 {
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108 if (LJ_UNLIKELY(sz > sbufleft(sb)))
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109 return lj_buf_more2(sb, sz);
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110 return sb->w;
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111 }
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112
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113 /* Extended buffer management */
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114 static LJ_AINLINE void lj_bufx_init(lua_State *L, SBufExt *sbx)
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115 {
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116 memset(sbx, 0, sizeof(SBufExt));
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117 setsbufXL(sbx, L, SBUF_FLAG_EXT);
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118 }
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119
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120 static LJ_AINLINE void lj_bufx_set_borrow(lua_State *L, SBufExt *sbx, SBuf *sb)
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121 {
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122 setsbufXL(sbx, L, SBUF_FLAG_EXT | SBUF_FLAG_BORROW);
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123 setmref(sbx->bsb, sb);
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124 sbx->r = sbx->w = sbx->b = sb->b;
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125 sbx->e = sb->e;
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126 }
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127
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128 static LJ_AINLINE void lj_bufx_set_cow(lua_State *L, SBufExt *sbx,
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129 const char *p, MSize len)
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130 {
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131 setsbufXL(sbx, L, SBUF_FLAG_EXT | SBUF_FLAG_COW);
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132 sbx->r = sbx->b = (char *)p;
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133 sbx->w = sbx->e = (char *)p + len;
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134 }
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135
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136 static LJ_AINLINE void lj_bufx_reset(SBufExt *sbx)
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137 {
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138 if (sbufiscow(sbx)) {
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139 setmrefu(sbx->L, (mrefu(sbx->L) & ~(GCSize)SBUF_FLAG_COW));
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140 setgcrefnull(sbx->cowref);
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141 sbx->b = sbx->e = NULL;
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142 }
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143 sbx->r = sbx->w = sbx->b;
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144 }
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145
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146 static LJ_AINLINE void lj_bufx_free(lua_State *L, SBufExt *sbx)
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147 {
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148 if (!sbufiscoworborrow(sbx)) lj_mem_free(G(L), sbx->b, sbufsz(sbx));
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149 setsbufXL(sbx, L, SBUF_FLAG_EXT);
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150 setgcrefnull(sbx->cowref);
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151 sbx->r = sbx->w = sbx->b = sbx->e = NULL;
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152 }
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153
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154 #if LJ_HASBUFFER && LJ_HASJIT
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155 LJ_FUNC void lj_bufx_set(SBufExt *sbx, const char *p, MSize len, GCobj *o);
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156 #if LJ_HASFFI
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157 LJ_FUNC MSize LJ_FASTCALL lj_bufx_more(SBufExt *sbx, MSize sz);
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158 #endif
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159 #endif
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160
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161 /* Low-level buffer put operations */
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162 LJ_FUNC SBuf *lj_buf_putmem(SBuf *sb, const void *q, MSize len);
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163 #if LJ_HASJIT || LJ_HASFFI
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164 LJ_FUNC SBuf * LJ_FASTCALL lj_buf_putchar(SBuf *sb, int c);
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165 #endif
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166 LJ_FUNC SBuf * LJ_FASTCALL lj_buf_putstr(SBuf *sb, GCstr *s);
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167
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168 static LJ_AINLINE char *lj_buf_wmem(char *p, const void *q, MSize len)
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169 {
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170 return (char *)memcpy(p, q, len) + len;
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171 }
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172
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173 static LJ_AINLINE void lj_buf_putb(SBuf *sb, int c)
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174 {
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175 char *w = lj_buf_more(sb, 1);
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176 *w++ = (char)c;
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177 sb->w = w;
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178 }
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179
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180 /* High-level buffer put operations */
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181 LJ_FUNCA SBuf * LJ_FASTCALL lj_buf_putstr_reverse(SBuf *sb, GCstr *s);
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182 LJ_FUNCA SBuf * LJ_FASTCALL lj_buf_putstr_lower(SBuf *sb, GCstr *s);
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183 LJ_FUNCA SBuf * LJ_FASTCALL lj_buf_putstr_upper(SBuf *sb, GCstr *s);
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184 LJ_FUNC SBuf *lj_buf_putstr_rep(SBuf *sb, GCstr *s, int32_t rep);
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185 LJ_FUNC SBuf *lj_buf_puttab(SBuf *sb, GCtab *t, GCstr *sep,
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186 int32_t i, int32_t e);
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187
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188 /* Miscellaneous buffer operations */
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189 LJ_FUNCA GCstr * LJ_FASTCALL lj_buf_tostr(SBuf *sb);
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190 LJ_FUNC GCstr *lj_buf_cat2str(lua_State *L, GCstr *s1, GCstr *s2);
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191 LJ_FUNC uint32_t LJ_FASTCALL lj_buf_ruleb128(const char **pp);
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192
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193 static LJ_AINLINE GCstr *lj_buf_str(lua_State *L, SBuf *sb)
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194 {
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195 return lj_str_new(L, sb->b, sbuflen(sb));
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196 }
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197
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198 #endif