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annotate third_party/luajit/src/lj_buf.h @ 279:b3b547563ec7

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Add Google connector service and agent wiki Implement the C/Seobeo Google Drive and Gmail connector with encrypted OAuth storage, Zenbu authentication, browser testing, AI tool discovery, chunked HTTP decoding, and Bazel coverage. Consolidate repository guidance into progressive wiki documentation and enforce arena-first allocation for new first-party C code. Co-authored-by: Copilot <[email protected]> Copilot-Session: 84c338fd-0939-4bb3-b7f3-1062eb213e5d
author MrJuneJune <me@mrjunejune.com>
date Mon, 17 Aug 2026 22:22:36 -0700
parents 94705b5986b3
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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