prosody
4533c9b906b0
util-src/struct.c

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util-src/struct.c @ 12983:4533c9b906b0

util.format: Tweak serialization of %q formatted entries Improves serialization of function references especially, the built-in default handling of that in util.serialization is not the most informative. Now, along with the function metatable from util.startup, the actual function can be found by filename and line number.
author Kim Alvefur <zash@zash.se>
date Sun, 26 Mar 2023 00:18:05 +0100
parent 12976:a187600ec7d6
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rev   line source
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1 /*
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2 ** {======================================================
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3 ** Library for packing/unpacking structures.
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4 ** $Id: struct.c,v 1.8 2018/05/16 11:00:23 roberto Exp $
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5 ** See Copyright Notice at the end of this file
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6 ** =======================================================
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7 */
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8 /*
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9 ** Valid formats:
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10 ** > - big endian
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11 ** < - little endian
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12 ** ![num] - alignment
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13 ** x - padding
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14 ** b/B - signed/unsigned byte
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15 ** h/H - signed/unsigned short
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16 ** l/L - signed/unsigned long
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17 ** T - size_t
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18 ** i/In - signed/unsigned integer with size 'n' (default is size of int)
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19 ** cn - sequence of 'n' chars (from/to a string); when packing, n==0 means
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20 the whole string; when unpacking, n==0 means use the previous
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21 read number as the string length
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22 ** s - zero-terminated string
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23 ** f - float
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24 ** d - double
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25 ** ' ' - ignored
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26 */
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27
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28
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29 #include <ctype.h>
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30 #include <limits.h>
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31 #include <stddef.h>
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32 #include <string.h>
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33
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34
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35 #include "lua.h"
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36 #include "lauxlib.h"
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39
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40 /* basic integer type */
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41 #if !defined(STRUCT_INT)
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42 #define STRUCT_INT long
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43 #endif
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44
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45 typedef STRUCT_INT Inttype;
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46
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47 /* corresponding unsigned version */
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48 typedef unsigned STRUCT_INT Uinttype;
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49
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50
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51 /* maximum size (in bytes) for integral types */
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52 #define MAXINTSIZE 32
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53
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54 /* is 'x' a power of 2? */
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55 #define isp2(x) ((x) > 0 && ((x) & ((x) - 1)) == 0)
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56
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57 /* dummy structure to get alignment requirements */
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58 struct cD {
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59 char c;
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60 double d;
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61 };
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62
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63
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64 #define PADDING (sizeof(struct cD) - sizeof(double))
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65 #define MAXALIGN (PADDING > sizeof(int) ? PADDING : sizeof(int))
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66
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67
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68 /* endian options */
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69 #define BIG 0
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70 #define LITTLE 1
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71
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72
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73 static union {
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74 int dummy;
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75 char endian;
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76 } const native = {1};
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77
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78
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79 typedef struct Header {
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80 int endian;
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81 int align;
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82 } Header;
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83
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84
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85 static int getnum (const char **fmt, int df) {
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86 if (!isdigit(**fmt)) /* no number? */
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87 return df; /* return default value */
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88 else {
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89 int a = 0;
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90 do {
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91 a = a*10 + *((*fmt)++) - '0';
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92 } while (isdigit(**fmt));
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93 return a;
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94 }
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95 }
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96
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97
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98 #define defaultoptions(h) ((h)->endian = native.endian, (h)->align = 1)
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99
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100
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101
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102 static size_t optsize (lua_State *L, char opt, const char **fmt) {
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103 switch (opt) {
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104 case 'B': case 'b': return sizeof(char);
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105 case 'H': case 'h': return sizeof(short);
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106 case 'L': case 'l': return sizeof(long);
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107 case 'T': return sizeof(size_t);
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108 case 'f': return sizeof(float);
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109 case 'd': return sizeof(double);
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110 case 'x': return 1;
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111 case 'c': return getnum(fmt, 1);
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112 case 'i': case 'I': {
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113 int sz = getnum(fmt, sizeof(int));
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114 if (sz > MAXINTSIZE)
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115 luaL_error(L, "integral size %d is larger than limit of %d",
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116 sz, MAXINTSIZE);
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117 return sz;
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118 }
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119 default: return 0; /* other cases do not need alignment */
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120 }
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121 }
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122
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123
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124 /*
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125 ** return number of bytes needed to align an element of size 'size'
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126 ** at current position 'len'
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127 */
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128 static int gettoalign (size_t len, Header *h, int opt, size_t size) {
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129 if (size == 0 || opt == 'c') return 0;
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130 if (size > (size_t)h->align)
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131 size = h->align; /* respect max. alignment */
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132 return (size - (len & (size - 1))) & (size - 1);
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133 }
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134
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135
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136 /*
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137 ** options to control endianness and alignment
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138 */
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139 static void controloptions (lua_State *L, int opt, const char **fmt,
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140 Header *h) {
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141 switch (opt) {
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142 case ' ': return; /* ignore white spaces */
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143 case '>': h->endian = BIG; return;
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144 case '<': h->endian = LITTLE; return;
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145 case '!': {
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146 int a = getnum(fmt, MAXALIGN);
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147 if (!isp2(a))
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148 luaL_error(L, "alignment %d is not a power of 2", a);
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parents:
diff changeset
149 h->align = a;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
150 return;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
151 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
152 default: {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
153 const char *msg = lua_pushfstring(L, "invalid format option '%c'", opt);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
154 luaL_argerror(L, 1, msg);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
155 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
156 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
157 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
158
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
159
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
160 static void putinteger (lua_State *L, luaL_Buffer *b, int arg, int endian,
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
161 int size) {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
162 lua_Number n = luaL_checknumber(L, arg);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
163 Uinttype value;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
164 char buff[MAXINTSIZE];
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
165 if (n < 0)
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
166 value = (Uinttype)(Inttype)n;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
167 else
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
168 value = (Uinttype)n;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
169 if (endian == LITTLE) {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
170 int i;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
171 for (i = 0; i < size; i++) {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
172 buff[i] = (value & 0xff);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
173 value >>= 8;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
174 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
175 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
176 else {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
177 int i;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
178 for (i = size - 1; i >= 0; i--) {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
179 buff[i] = (value & 0xff);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
180 value >>= 8;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
181 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
182 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
183 luaL_addlstring(b, buff, size);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
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diff changeset
184 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
185
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
186
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
187 static void correctbytes (char *b, int size, int endian) {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
188 if (endian != native.endian) {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
189 int i = 0;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
190 while (i < --size) {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
191 char temp = b[i];
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
192 b[i++] = b[size];
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
193 b[size] = temp;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
194 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
195 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
196 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
197
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
198
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
199 static int b_pack (lua_State *L) {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
200 luaL_Buffer b;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
201 const char *fmt = luaL_checkstring(L, 1);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
202 Header h;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
203 int arg = 2;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
204 size_t totalsize = 0;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
205 defaultoptions(&h);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
206 lua_pushnil(L); /* mark to separate arguments from string buffer */
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
207 luaL_buffinit(L, &b);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
208 while (*fmt != '\0') {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
209 int opt = *fmt++;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
210 size_t size = optsize(L, opt, &fmt);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
211 int toalign = gettoalign(totalsize, &h, opt, size);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
212 totalsize += toalign;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
213 while (toalign-- > 0) luaL_addchar(&b, '\0');
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
214 switch (opt) {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
215 case 'b': case 'B': case 'h': case 'H':
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
216 case 'l': case 'L': case 'T': case 'i': case 'I': { /* integer types */
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
217 putinteger(L, &b, arg++, h.endian, size);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
218 break;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
219 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
220 case 'x': {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
221 luaL_addchar(&b, '\0');
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
222 break;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
223 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
224 case 'f': {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
225 float f = (float)luaL_checknumber(L, arg++);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
226 correctbytes((char *)&f, size, h.endian);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
227 luaL_addlstring(&b, (char *)&f, size);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
228 break;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
229 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
230 case 'd': {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
231 double d = luaL_checknumber(L, arg++);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
232 correctbytes((char *)&d, size, h.endian);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
233 luaL_addlstring(&b, (char *)&d, size);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
234 break;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
235 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
236 case 'c': case 's': {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
237 size_t l;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
238 const char *s = luaL_checklstring(L, arg++, &l);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
239 if (size == 0) size = l;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
240 luaL_argcheck(L, l >= (size_t)size, arg, "string too short");
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
241 luaL_addlstring(&b, s, size);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
242 if (opt == 's') {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
243 luaL_addchar(&b, '\0'); /* add zero at the end */
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
244 size++;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
245 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
246 break;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
247 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
248 default: controloptions(L, opt, &fmt, &h);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
249 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
250 totalsize += size;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
251 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
252 luaL_pushresult(&b);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
253 return 1;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
254 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
255
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
256
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
257 static lua_Number getinteger (const char *buff, int endian,
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
258 int issigned, int size) {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
259 Uinttype l = 0;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
260 int i;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
261 if (endian == BIG) {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
262 for (i = 0; i < size; i++) {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
263 l <<= 8;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
264 l |= (Uinttype)(unsigned char)buff[i];
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
265 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
266 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
267 else {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
268 for (i = size - 1; i >= 0; i--) {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
269 l <<= 8;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
270 l |= (Uinttype)(unsigned char)buff[i];
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
271 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
272 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
273 if (!issigned)
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
274 return (lua_Number)l;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
275 else { /* signed format */
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
276 Uinttype mask = (Uinttype)(~((Uinttype)0)) << (size*8 - 1);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
277 if (l & mask) /* negative value? */
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
278 l |= mask; /* signal extension */
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
279 return (lua_Number)(Inttype)l;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
280 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
281 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
282
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
283
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
284 static int b_unpack (lua_State *L) {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
285 Header h;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
286 const char *fmt = luaL_checkstring(L, 1);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
287 size_t ld;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
288 const char *data = luaL_checklstring(L, 2, &ld);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
289 size_t pos = (size_t)luaL_optinteger(L, 3, 1) - 1;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
290 int n = 0; /* number of results */
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
291 luaL_argcheck(L, pos <= ld, 3, "initial position out of string");
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
292 defaultoptions(&h);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
293 while (*fmt) {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
294 int opt = *fmt++;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
295 size_t size = optsize(L, opt, &fmt);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
296 pos += gettoalign(pos, &h, opt, size);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
297 luaL_argcheck(L, size <= ld - pos, 2, "data string too short");
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298 /* stack space for item + next position */
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diff changeset
299 luaL_checkstack(L, 2, "too many results");
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diff changeset
300 switch (opt) {
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diff changeset
301 case 'b': case 'B': case 'h': case 'H':
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302 case 'l': case 'L': case 'T': case 'i': case 'I': { /* integer types */
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303 int issigned = islower(opt);
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304 lua_Number res = getinteger(data+pos, h.endian, issigned, size);
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305 lua_pushnumber(L, res); n++;
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306 break;
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307 }
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308 case 'x': {
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309 break;
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310 }
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311 case 'f': {
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312 float f;
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313 memcpy(&f, data+pos, size);
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314 correctbytes((char *)&f, sizeof(f), h.endian);
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315 lua_pushnumber(L, f); n++;
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316 break;
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317 }
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318 case 'd': {
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319 double d;
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320 memcpy(&d, data+pos, size);
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321 correctbytes((char *)&d, sizeof(d), h.endian);
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322 lua_pushnumber(L, d); n++;
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323 break;
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324 }
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325 case 'c': {
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326 if (size == 0) {
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327 if (n == 0 || !lua_isnumber(L, -1))
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328 luaL_error(L, "format 'c0' needs a previous size");
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329 size = lua_tonumber(L, -1);
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330 lua_pop(L, 1); n--;
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331 luaL_argcheck(L, size <= ld - pos, 2, "data string too short");
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332 }
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333 lua_pushlstring(L, data+pos, size); n++;
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334 break;
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diff changeset
335 }
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336 case 's': {
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337 const char *e = (const char *)memchr(data+pos, '\0', ld - pos);
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338 if (e == NULL)
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339 luaL_error(L, "unfinished string in data");
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340 size = (e - (data+pos)) + 1;
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341 lua_pushlstring(L, data+pos, size - 1); n++;
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342 break;
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343 }
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344 default: controloptions(L, opt, &fmt, &h);
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345 }
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346 pos += size;
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diff changeset
347 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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348 lua_pushinteger(L, pos + 1); /* next position */
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349 return n + 1;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
350 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
351
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diff changeset
352
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353 static int b_size (lua_State *L) {
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diff changeset
354 Header h;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
355 const char *fmt = luaL_checkstring(L, 1);
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diff changeset
356 size_t pos = 0;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
357 defaultoptions(&h);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
358 while (*fmt) {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
359 int opt = *fmt++;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
360 size_t size = optsize(L, opt, &fmt);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
361 pos += gettoalign(pos, &h, opt, size);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
362 if (opt == 's')
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
363 luaL_argerror(L, 1, "option 's' has no fixed size");
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parents:
diff changeset
364 else if (opt == 'c' && size == 0)
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
365 luaL_argerror(L, 1, "option 'c0' has no fixed size");
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
366 if (!isalnum(opt))
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
367 controloptions(L, opt, &fmt, &h);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
368 pos += size;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
369 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
370 lua_pushinteger(L, pos);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
371 return 1;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
372 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
373
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
374 /* }====================================================== */
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
375
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
376
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
377
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
378 static const struct luaL_Reg thislib[] = {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
379 {"pack", b_pack},
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
380 {"unpack", b_unpack},
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
381 {"size", b_size},
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
382 {NULL, NULL}
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
383 };
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
384
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
385
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
386 LUALIB_API int luaopen_util_struct (lua_State *L);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
387
12976
a187600ec7d6 util: Add compat for prosody module name change to C sources
Kim Alvefur <zash@zash.se>
parents: 12853
diff changeset
388 LUALIB_API int luaopen_prosody_util_struct (lua_State *L) {
12575
1f6f05a98fcd util-src: Remove Lua 5.1 compat macros
Kim Alvefur <zash@zash.se>
parents: 12387
diff changeset
389 luaL_newlib(L, thislib);
12354
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
390 return 1;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
391 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
392
12976
a187600ec7d6 util: Add compat for prosody module name change to C sources
Kim Alvefur <zash@zash.se>
parents: 12853
diff changeset
393 LUALIB_API int luaopen_util_struct (lua_State *L) {
a187600ec7d6 util: Add compat for prosody module name change to C sources
Kim Alvefur <zash@zash.se>
parents: 12853
diff changeset
394 return luaopen_prosody_util_struct(L);
a187600ec7d6 util: Add compat for prosody module name change to C sources
Kim Alvefur <zash@zash.se>
parents: 12853
diff changeset
395 }
a187600ec7d6 util: Add compat for prosody module name change to C sources
Kim Alvefur <zash@zash.se>
parents: 12853
diff changeset
396
12354
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
397
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
398 /******************************************************************************
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
399 * Copyright (C) 2010-2018 Lua.org, PUC-Rio. All rights reserved.
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
400 *
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
401 * Permission is hereby granted, free of charge, to any person obtaining
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
402 * a copy of this software and associated documentation files (the
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
403 * "Software"), to deal in the Software without restriction, including
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
404 * without limitation the rights to use, copy, modify, merge, publish,
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
405 * distribute, sublicense, and/or sell copies of the Software, and to
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
406 * permit persons to whom the Software is furnished to do so, subject to
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
407 * the following conditions:
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
408 *
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
409 * The above copyright notice and this permission notice shall be
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
410 * included in all copies or substantial portions of the Software.
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
411 *
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
412 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
413 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
414 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
415 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
416 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
417 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
418 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
419 ******************************************************************************/
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
420