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annotate src/vbuf.c @ 402:37cd2aea5d4a

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update x_python.m4 to detect python 3.9
author Carl Byington <carl@five-ten-sg.com>
date Thu, 26 Mar 2020 09:22:43 -0700
parents 4fd5197aacc2
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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3cb02cb1e6cd Patch from Robert Simpson to fix doubly-linked list in the cache_ptr code, and allow arrays of unicode strings (without converting them).
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1
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2 #include "define.h"
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4 static int unicode_up = 0;
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5 static iconv_t i16to8;
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6 static const char *target_charset = NULL;
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7 static int target_open_from = 0;
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8 static int target_open_to = 0;
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9 static iconv_t i8totarget = (iconv_t)-1;
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10 static iconv_t target2i8 = (iconv_t)-1;
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13 #define ASSERT(x,...) { if( !(x) ) DIE(( __VA_ARGS__)); }
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15
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16 /** DESTRUCTIVELY grow or shrink buffer
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17 */
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18 static void pst_vbresize(pst_vbuf *vb, size_t len);
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19 static void pst_vbresize(pst_vbuf *vb, size_t len)
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20 {
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21 vb->dlen = 0;
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22
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23 if (vb->blen >= len) {
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24 vb->b = vb->buf;
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25 return;
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26 }
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28 vb->buf = realloc(vb->buf, len);
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29 vb->b = vb->buf;
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30 vb->blen = len;
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31 }
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33
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34 static size_t pst_vbavail(pst_vbuf * vb);
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35 static size_t pst_vbavail(pst_vbuf * vb)
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36 {
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37 return vb->blen - vb->dlen - (size_t)(vb->b - vb->buf);
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38 }
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41 static void open_targets(const char* charset);
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42 static void open_targets(const char* charset)
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43 {
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44 if (!target_charset || strcasecmp(target_charset, charset)) {
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45 if (target_open_from) iconv_close(i8totarget);
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46 if (target_open_to) iconv_close(target2i8);
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47 if (target_charset) free((char *)target_charset);
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48 target_charset = strdup(charset);
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49 target_open_from = 1;
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50 target_open_to = 1;
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51 i8totarget = iconv_open(target_charset, "utf-8");
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52 if (i8totarget == (iconv_t)-1) {
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53 target_open_from = 0;
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54 DEBUG_WARN(("Couldn't open iconv descriptor for utf-8 to %s.\n", target_charset));
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55 }
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56 target2i8 = iconv_open("utf-8", target_charset);
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57 if (target2i8 == (iconv_t)-1) {
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58 target_open_to = 0;
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59 DEBUG_WARN(("Couldn't open iconv descriptor for %s to utf-8.\n", target_charset));
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60 }
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61 }
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62 }
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65 static size_t sbcs_conversion(pst_vbuf *dest, const char *inbuf, int iblen, iconv_t conversion);
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66 static size_t sbcs_conversion(pst_vbuf *dest, const char *inbuf, int iblen, iconv_t conversion)
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67 {
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68 size_t inbytesleft = iblen;
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69 size_t icresult = (size_t)-1;
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70 size_t outbytesleft = 0;
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71 char *outbuf = NULL;
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72 int myerrno;
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73
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74 DEBUG_ENT("sbcs_conversion");
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75 pst_vbresize(dest, 2*iblen);
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76
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77 do {
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78 outbytesleft = dest->blen - dest->dlen;
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79 outbuf = dest->b + dest->dlen;
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80 icresult = iconv(conversion, (ICONV_CONST char**)&inbuf, &inbytesleft, &outbuf, &outbytesleft);
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81 myerrno = errno;
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82 dest->dlen = outbuf - dest->b;
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83 if (inbytesleft) pst_vbgrow(dest, 2*inbytesleft);
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84 } while ((size_t)-1 == icresult && E2BIG == myerrno);
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85
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86 if (icresult == (size_t)-1) {
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87 DEBUG_WARN(("iconv failure: %s\n", strerror(myerrno)));
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88 pst_unicode_init();
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89 DEBUG_RET();
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90 return (size_t)-1;
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91 }
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92 DEBUG_RET();
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93 return 0;
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94 }
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96
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97 static void pst_unicode_close();
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98 static void pst_unicode_close()
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99 {
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100 iconv_close(i16to8);
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101 if (target_open_from) iconv_close(i8totarget);
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102 if (target_open_to) iconv_close(target2i8);
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103 if (target_charset) free((char *)target_charset);
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104 target_charset = NULL;
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105 target_open_from = 0;
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106 target_open_to = 0;
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107 unicode_up = 0;
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108 }
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110
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111 static int utf16_is_terminated(const char *str, int length);
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112 static int utf16_is_terminated(const char *str, int length)
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113 {
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114 int len = -1;
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115 int i;
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116 for (i = 0; i < length; i += 2) {
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117 if (str[i] == 0 && str[i + 1] == 0) {
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118 len = i;
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119 }
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120 }
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121
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122 if (len == -1) {
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123 DEBUG_WARN(("utf16 string is not zero terminated\n"));
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124 }
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125
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126 return (len == -1) ? 0 : 1;
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127 }
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128
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129
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130 pst_vbuf *pst_vballoc(size_t len)
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131 {
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132 pst_vbuf *result = pst_malloc(sizeof(pst_vbuf));
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133 if (result) {
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134 result->dlen = 0;
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135 result->blen = 0;
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136 result->buf = NULL;
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137 pst_vbresize(result, len);
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138 }
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139 else DIE(("malloc() failure"));
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140 return result;
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141 }
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142
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143
182
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144 /** out: vbavail(vb) >= len, data are preserved
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145 */
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146 void pst_vbgrow(pst_vbuf *vb, size_t len)
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147 {
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148 if (0 == len)
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149 return;
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150
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151 if (0 == vb->blen) {
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152 pst_vbresize(vb, len);
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153 return;
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154 }
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155
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156 if (vb->dlen + len > vb->blen) {
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157 if (vb->dlen + len < vb->blen * 1.5)
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158 len = vb->blen * 1.5;
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159 char *nb = pst_malloc(vb->blen + len);
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160 if (!nb) DIE(("malloc() failure"));
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161 vb->blen = vb->blen + len;
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162 memcpy(nb, vb->b, vb->dlen);
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163
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164 free(vb->buf);
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165 vb->buf = nb;
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166 vb->b = vb->buf;
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167 } else {
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168 if (vb->b != vb->buf)
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169 memcpy(vb->buf, vb->b, vb->dlen);
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170 }
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171
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172 vb->b = vb->buf;
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173
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174 ASSERT(pst_vbavail(vb) >= len, "vbgrow(): I have failed in my mission.");
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175 }
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176
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177
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178 /** set vbuf b size=len, resize if necessary, relen = how much to over-allocate
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179 */
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180 void pst_vbset(pst_vbuf * vb, void *b, size_t len)
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181 {
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182 pst_vbresize(vb, len);
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183 memcpy(vb->b, b, len);
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184 vb->dlen = len;
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185 }
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186
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187
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188 /** append len bytes of b to vb, resize if necessary
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189 */
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190 void pst_vbappend(pst_vbuf *vb, void *b, size_t len)
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191 {
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192 if (0 == vb->dlen) {
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193 pst_vbset(vb, b, len);
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194 return;
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195 }
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196 pst_vbgrow(vb, len);
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197 memcpy(vb->b + vb->dlen, b, len);
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198 vb->dlen += len;
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199 }
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200
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201
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202 void pst_unicode_init()
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203 {
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204 if (unicode_up) pst_unicode_close();
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205 i16to8 = iconv_open("utf-8", "utf-16le");
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206 if (i16to8 == (iconv_t)-1) {
195
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207 DEBUG_WARN(("Couldn't open iconv descriptor for utf-16le to utf-8.\n"));
182
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208 }
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209 unicode_up = 1;
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210 }
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211
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212
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213 size_t pst_vb_utf16to8(pst_vbuf *dest, const char *inbuf, int iblen)
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214 {
116
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215 size_t inbytesleft = iblen;
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216 size_t icresult = (size_t)-1;
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217 size_t outbytesleft = 0;
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218 char *outbuf = NULL;
164
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219 int myerrno;
70
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220
195
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221 if (!unicode_up) return (size_t)-1; // failure to open iconv
172
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222 pst_vbresize(dest, iblen);
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223
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224 //Bad Things can happen if a non-zero-terminated utf16 string comes through here
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225 if (!utf16_is_terminated(inbuf, iblen))
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226 return (size_t)-1;
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227
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228 do {
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229 outbytesleft = dest->blen - dest->dlen;
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230 outbuf = dest->b + dest->dlen;
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231 icresult = iconv(i16to8, (ICONV_CONST char**)&inbuf, &inbytesleft, &outbuf, &outbytesleft);
164
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232 myerrno = errno;
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233 dest->dlen = outbuf - dest->b;
172
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234 if (inbytesleft) pst_vbgrow(dest, inbytesleft);
164
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235 } while ((size_t)-1 == icresult && E2BIG == myerrno);
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236
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237 if (icresult == (size_t)-1) {
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238 DEBUG_WARN(("iconv failure: %s\n", strerror(myerrno)));
172
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239 pst_unicode_init();
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240 return (size_t)-1;
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241 }
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242 return (icresult) ? (size_t)-1 : 0;
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243 }
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244
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245
182
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246 size_t pst_vb_utf8to8bit(pst_vbuf *dest, const char *inbuf, int iblen, const char* charset)
151
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247 {
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diff changeset
248 open_targets(charset);
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249 if (!target_open_from) return (size_t)-1; // failure to open the target
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250 return sbcs_conversion(dest, inbuf, iblen, i8totarget);
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251 }
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252
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253
182
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254 size_t pst_vb_8bit2utf8(pst_vbuf *dest, const char *inbuf, int iblen, const char* charset)
151
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255 {
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diff changeset
256 open_targets(charset);
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257 if (!target_open_to) return (size_t)-1; // failure to open the target
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diff changeset
258 return sbcs_conversion(dest, inbuf, iblen, target2i8);
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259 }
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diff changeset
260