1 | /* |
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2 | * tclStringObj.c -- |
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3 | * |
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4 | * This file contains procedures that implement string operations |
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5 | * on Tcl objects. To do this efficiently (i.e. to allow many |
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6 | * appends to be done to an object without constantly reallocating |
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7 | * the space for the string representation) we overallocate the |
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8 | * space for the string and use the internal representation to keep |
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9 | * track of the extra space. Objects with this internal |
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10 | * representation are called "expandable string objects". |
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11 | * |
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12 | * Copyright (c) 1995-1997 Sun Microsystems, Inc. |
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13 | * |
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14 | * See the file "license.terms" for information on usage and redistribution |
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15 | * of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
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16 | * |
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17 | * RCS: @(#) $Id: tclStringObj.c,v 1.1 2008-06-04 13:58:10 demin Exp $ |
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18 | */ |
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19 | |
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20 | #include "tclInt.h" |
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21 | |
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22 | /* |
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23 | * Prototypes for procedures defined later in this file: |
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24 | */ |
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25 | |
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26 | static void ConvertToStringType _ANSI_ARGS_((Tcl_Obj *objPtr)); |
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27 | static void DupStringInternalRep _ANSI_ARGS_((Tcl_Obj *objPtr, |
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28 | Tcl_Obj *copyPtr)); |
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29 | static int SetStringFromAny _ANSI_ARGS_((Tcl_Interp *interp, |
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30 | Tcl_Obj *objPtr)); |
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31 | static void UpdateStringOfString _ANSI_ARGS_((Tcl_Obj *objPtr)); |
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32 | |
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33 | /* |
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34 | * The structure below defines the string Tcl object type by means of |
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35 | * procedures that can be invoked by generic object code. |
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36 | */ |
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37 | |
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38 | Tcl_ObjType tclStringType = { |
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39 | "string", /* name */ |
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40 | (Tcl_FreeInternalRepProc *) NULL, /* freeIntRepProc */ |
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41 | DupStringInternalRep, /* dupIntRepProc */ |
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42 | UpdateStringOfString, /* updateStringProc */ |
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43 | SetStringFromAny /* setFromAnyProc */ |
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44 | }; |
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45 | |
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46 | /* |
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47 | *---------------------------------------------------------------------- |
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48 | * |
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49 | * Tcl_NewStringObj -- |
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50 | * |
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51 | * This procedure is normally called when not debugging: i.e., when |
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52 | * TCL_MEM_DEBUG is not defined. It creates a new string object and |
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53 | * initializes it from the byte pointer and length arguments. |
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54 | * |
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55 | * When TCL_MEM_DEBUG is defined, this procedure just returns the |
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56 | * result of calling the debugging version Tcl_DbNewStringObj. |
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57 | * |
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58 | * Results: |
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59 | * A newly created string object is returned that has ref count zero. |
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60 | * |
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61 | * Side effects: |
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62 | * The new object's internal string representation will be set to a |
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63 | * copy of the length bytes starting at "bytes". If "length" is |
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64 | * negative, use bytes up to the first NULL byte; i.e., assume "bytes" |
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65 | * points to a C-style NULL-terminated string. The object's type is set |
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66 | * to NULL. An extra NULL is added to the end of the new object's byte |
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67 | * array. |
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68 | * |
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69 | *---------------------------------------------------------------------- |
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70 | */ |
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71 | |
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72 | #ifdef TCL_MEM_DEBUG |
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73 | #undef Tcl_NewStringObj |
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74 | |
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75 | Tcl_Obj * |
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76 | Tcl_NewStringObj(bytes, length) |
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77 | register char *bytes; /* Points to the first of the length bytes |
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78 | * used to initialize the new object. */ |
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79 | register int length; /* The number of bytes to copy from "bytes" |
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80 | * when initializing the new object. If |
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81 | * negative, use bytes up to the first |
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82 | * NULL byte. */ |
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83 | { |
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84 | return Tcl_DbNewStringObj(bytes, length, "unknown", 0); |
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85 | } |
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86 | |
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87 | #else /* if not TCL_MEM_DEBUG */ |
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88 | |
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89 | Tcl_Obj * |
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90 | Tcl_NewStringObj(bytes, length) |
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91 | register char *bytes; /* Points to the first of the length bytes |
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92 | * used to initialize the new object. */ |
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93 | register int length; /* The number of bytes to copy from "bytes" |
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94 | * when initializing the new object. If |
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95 | * negative, use bytes up to the first |
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96 | * NULL byte. */ |
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97 | { |
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98 | register Tcl_Obj *objPtr; |
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99 | |
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100 | if (length < 0) { |
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101 | length = (bytes? strlen(bytes) : 0); |
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102 | } |
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103 | TclNewObj(objPtr); |
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104 | TclInitStringRep(objPtr, bytes, length); |
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105 | return objPtr; |
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106 | } |
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107 | #endif /* TCL_MEM_DEBUG */ |
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108 | |
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109 | /* |
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110 | *---------------------------------------------------------------------- |
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111 | * |
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112 | * Tcl_DbNewStringObj -- |
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113 | * |
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114 | * This procedure is normally called when debugging: i.e., when |
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115 | * TCL_MEM_DEBUG is defined. It creates new string objects. It is the |
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116 | * same as the Tcl_NewStringObj procedure above except that it calls |
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117 | * Tcl_DbCkalloc directly with the file name and line number from its |
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118 | * caller. This simplifies debugging since then the checkmem command |
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119 | * will report the correct file name and line number when reporting |
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120 | * objects that haven't been freed. |
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121 | * |
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122 | * When TCL_MEM_DEBUG is not defined, this procedure just returns the |
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123 | * result of calling Tcl_NewStringObj. |
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124 | * |
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125 | * Results: |
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126 | * A newly created string object is returned that has ref count zero. |
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127 | * |
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128 | * Side effects: |
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129 | * The new object's internal string representation will be set to a |
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130 | * copy of the length bytes starting at "bytes". If "length" is |
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131 | * negative, use bytes up to the first NULL byte; i.e., assume "bytes" |
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132 | * points to a C-style NULL-terminated string. The object's type is set |
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133 | * to NULL. An extra NULL is added to the end of the new object's byte |
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134 | * array. |
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135 | * |
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136 | *---------------------------------------------------------------------- |
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137 | */ |
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138 | |
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139 | #ifdef TCL_MEM_DEBUG |
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140 | |
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141 | Tcl_Obj * |
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142 | Tcl_DbNewStringObj(bytes, length, file, line) |
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143 | register char *bytes; /* Points to the first of the length bytes |
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144 | * used to initialize the new object. */ |
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145 | register int length; /* The number of bytes to copy from "bytes" |
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146 | * when initializing the new object. If |
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147 | * negative, use bytes up to the first |
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148 | * NULL byte. */ |
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149 | char *file; /* The name of the source file calling this |
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150 | * procedure; used for debugging. */ |
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151 | int line; /* Line number in the source file; used |
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152 | * for debugging. */ |
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153 | { |
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154 | register Tcl_Obj *objPtr; |
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155 | |
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156 | if (length < 0) { |
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157 | length = (bytes? strlen(bytes) : 0); |
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158 | } |
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159 | TclDbNewObj(objPtr, file, line); |
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160 | TclInitStringRep(objPtr, bytes, length); |
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161 | return objPtr; |
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162 | } |
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163 | |
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164 | #else /* if not TCL_MEM_DEBUG */ |
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165 | |
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166 | Tcl_Obj * |
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167 | Tcl_DbNewStringObj(bytes, length, file, line) |
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168 | register char *bytes; /* Points to the first of the length bytes |
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169 | * used to initialize the new object. */ |
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170 | register int length; /* The number of bytes to copy from "bytes" |
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171 | * when initializing the new object. If |
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172 | * negative, use bytes up to the first |
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173 | * NULL byte. */ |
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174 | char *file; /* The name of the source file calling this |
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175 | * procedure; used for debugging. */ |
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176 | int line; /* Line number in the source file; used |
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177 | * for debugging. */ |
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178 | { |
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179 | return Tcl_NewStringObj(bytes, length); |
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180 | } |
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181 | #endif /* TCL_MEM_DEBUG */ |
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182 | |
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183 | /* |
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184 | *---------------------------------------------------------------------- |
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185 | * |
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186 | * Tcl_SetStringObj -- |
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187 | * |
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188 | * Modify an object to hold a string that is a copy of the bytes |
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189 | * indicated by the byte pointer and length arguments. |
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190 | * |
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191 | * Results: |
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192 | * None. |
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193 | * |
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194 | * Side effects: |
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195 | * The object's string representation will be set to a copy of |
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196 | * the "length" bytes starting at "bytes". If "length" is negative, use |
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197 | * bytes up to the first NULL byte; i.e., assume "bytes" points to a |
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198 | * C-style NULL-terminated string. The object's old string and internal |
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199 | * representations are freed and the object's type is set NULL. |
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200 | * |
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201 | *---------------------------------------------------------------------- |
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202 | */ |
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203 | |
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204 | void |
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205 | Tcl_SetStringObj(objPtr, bytes, length) |
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206 | register Tcl_Obj *objPtr; /* Object whose internal rep to init. */ |
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207 | char *bytes; /* Points to the first of the length bytes |
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208 | * used to initialize the object. */ |
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209 | register int length; /* The number of bytes to copy from "bytes" |
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210 | * when initializing the object. If |
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211 | * negative, use bytes up to the first |
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212 | * NULL byte.*/ |
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213 | { |
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214 | register Tcl_ObjType *oldTypePtr = objPtr->typePtr; |
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215 | |
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216 | /* |
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217 | * Free any old string rep, then set the string rep to a copy of |
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218 | * the length bytes starting at "bytes". |
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219 | */ |
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220 | |
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221 | if (Tcl_IsShared(objPtr)) { |
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222 | panic("Tcl_SetStringObj called with shared object"); |
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223 | } |
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224 | |
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225 | Tcl_InvalidateStringRep(objPtr); |
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226 | if (length < 0) { |
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227 | length = strlen(bytes); |
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228 | } |
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229 | TclInitStringRep(objPtr, bytes, length); |
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230 | |
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231 | /* |
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232 | * Set the type to NULL and free any internal rep for the old type. |
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233 | */ |
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234 | |
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235 | if ((oldTypePtr != NULL) && (oldTypePtr->freeIntRepProc != NULL)) { |
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236 | oldTypePtr->freeIntRepProc(objPtr); |
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237 | } |
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238 | objPtr->typePtr = NULL; |
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239 | } |
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240 | |
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241 | /* |
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242 | *---------------------------------------------------------------------- |
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243 | * |
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244 | * Tcl_SetObjLength -- |
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245 | * |
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246 | * This procedure changes the length of the string representation |
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247 | * of an object. |
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248 | * |
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249 | * Results: |
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250 | * None. |
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251 | * |
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252 | * Side effects: |
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253 | * If the size of objPtr's string representation is greater than |
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254 | * length, then it is reduced to length and a new terminating null |
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255 | * byte is stored in the strength. If the length of the string |
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256 | * representation is greater than length, the storage space is |
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257 | * reallocated to the given length; a null byte is stored at the |
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258 | * end, but other bytes past the end of the original string |
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259 | * representation are undefined. The object's internal |
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260 | * representation is changed to "expendable string". |
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261 | * |
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262 | *---------------------------------------------------------------------- |
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263 | */ |
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264 | |
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265 | void |
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266 | Tcl_SetObjLength(objPtr, length) |
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267 | register Tcl_Obj *objPtr; /* Pointer to object. This object must |
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268 | * not currently be shared. */ |
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269 | register int length; /* Number of bytes desired for string |
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270 | * representation of object, not including |
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271 | * terminating null byte. */ |
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272 | { |
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273 | char *new; |
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274 | |
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275 | if (Tcl_IsShared(objPtr)) { |
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276 | panic("Tcl_SetObjLength called with shared object"); |
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277 | } |
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278 | if (objPtr->typePtr != &tclStringType) { |
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279 | ConvertToStringType(objPtr); |
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280 | } |
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281 | |
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282 | if ((long)length > objPtr->internalRep.longValue) { |
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283 | /* |
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284 | * Not enough space in current string. Reallocate the string |
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285 | * space and free the old string. |
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286 | */ |
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287 | |
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288 | new = (char *) ckalloc((unsigned) (length+1)); |
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289 | if (objPtr->bytes != NULL) { |
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290 | memcpy((VOID *) new, (VOID *) objPtr->bytes, |
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291 | (size_t) objPtr->length); |
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292 | Tcl_InvalidateStringRep(objPtr); |
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293 | } |
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294 | objPtr->bytes = new; |
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295 | objPtr->internalRep.longValue = (long) length; |
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296 | } |
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297 | objPtr->length = length; |
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298 | if ((objPtr->bytes != NULL) && (objPtr->bytes != tclEmptyStringRep)) { |
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299 | objPtr->bytes[length] = 0; |
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300 | } |
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301 | } |
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302 | |
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303 | /* |
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304 | *---------------------------------------------------------------------- |
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305 | * |
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306 | * Tcl_AppendToObj -- |
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307 | * |
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308 | * This procedure appends a sequence of bytes to an object. |
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309 | * |
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310 | * Results: |
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311 | * None. |
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312 | * |
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313 | * Side effects: |
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314 | * The bytes at *bytes are appended to the string representation |
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315 | * of objPtr. |
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316 | * |
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317 | *---------------------------------------------------------------------- |
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318 | */ |
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319 | |
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320 | void |
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321 | Tcl_AppendToObj(objPtr, bytes, length) |
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322 | register Tcl_Obj *objPtr; /* Points to the object to append to. */ |
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323 | char *bytes; /* Points to the bytes to append to the |
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324 | * object. */ |
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325 | register int length; /* The number of bytes to append from |
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326 | * "bytes". If < 0, then append all bytes |
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327 | * up to NULL byte. */ |
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328 | { |
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329 | int newLength, oldLength; |
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330 | |
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331 | if (Tcl_IsShared(objPtr)) { |
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332 | panic("Tcl_AppendToObj called with shared object"); |
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333 | } |
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334 | if (objPtr->typePtr != &tclStringType) { |
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335 | ConvertToStringType(objPtr); |
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336 | } |
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337 | if (length < 0) { |
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338 | length = strlen(bytes); |
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339 | } |
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340 | if (length == 0) { |
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341 | return; |
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342 | } |
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343 | oldLength = objPtr->length; |
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344 | newLength = length + oldLength; |
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345 | if ((long)newLength > objPtr->internalRep.longValue) { |
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346 | /* |
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347 | * There isn't currently enough space in the string |
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348 | * representation so allocate additional space. In fact, |
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349 | * overallocate so that there is room for future growth without |
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350 | * having to reallocate again. |
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351 | */ |
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352 | |
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353 | Tcl_SetObjLength(objPtr, 2*newLength); |
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354 | } |
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355 | if (length > 0) { |
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356 | memcpy((VOID *) (objPtr->bytes + oldLength), (VOID *) bytes, |
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357 | (size_t) length); |
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358 | objPtr->length = newLength; |
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359 | objPtr->bytes[objPtr->length] = 0; |
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360 | } |
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361 | } |
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362 | |
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363 | /* |
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364 | *---------------------------------------------------------------------- |
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365 | * |
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366 | * Tcl_AppendStringsToObj -- |
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367 | * |
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368 | * This procedure appends one or more null-terminated strings |
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369 | * to an object. |
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370 | * |
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371 | * Results: |
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372 | * None. |
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373 | * |
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374 | * Side effects: |
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375 | * The contents of all the string arguments are appended to the |
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376 | * string representation of objPtr. |
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377 | * |
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378 | *---------------------------------------------------------------------- |
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379 | */ |
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380 | |
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381 | void |
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382 | Tcl_AppendStringsToObj TCL_VARARGS_DEF(Tcl_Obj *,arg1) |
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383 | { |
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384 | va_list argList; |
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385 | register Tcl_Obj *objPtr; |
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386 | int newLength, oldLength; |
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387 | register char *string, *dst; |
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388 | |
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389 | objPtr = (Tcl_Obj *) TCL_VARARGS_START(Tcl_Obj *,arg1,argList); |
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390 | if (Tcl_IsShared(objPtr)) { |
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391 | panic("Tcl_AppendStringsToObj called with shared object"); |
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392 | } |
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393 | if (objPtr->typePtr != &tclStringType) { |
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394 | ConvertToStringType(objPtr); |
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395 | } |
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396 | |
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397 | /* |
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398 | * Figure out how much space is needed for all the strings, and |
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399 | * expand the string representation if it isn't big enough. If no |
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400 | * bytes would be appended, just return. |
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401 | */ |
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402 | |
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403 | newLength = oldLength = objPtr->length; |
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404 | while (1) { |
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405 | string = va_arg(argList, char *); |
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406 | if (string == NULL) { |
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407 | break; |
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408 | } |
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409 | newLength += strlen(string); |
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410 | } |
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411 | if (newLength == oldLength) { |
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412 | return; |
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413 | } |
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414 | |
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415 | if ((long)newLength > objPtr->internalRep.longValue) { |
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416 | /* |
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417 | * There isn't currently enough space in the string |
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418 | * representation so allocate additional space. If the current |
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419 | * string representation isn't empty (i.e. it looks like we're |
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420 | * doing a series of appends) then overallocate the space so |
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421 | * that we won't have to do as much reallocation in the future. |
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422 | */ |
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423 | |
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424 | Tcl_SetObjLength(objPtr, |
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425 | (objPtr->length == 0) ? newLength : 2*newLength); |
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426 | } |
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427 | |
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428 | /* |
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429 | * Make a second pass through the arguments, appending all the |
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430 | * strings to the object. |
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431 | */ |
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432 | |
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433 | TCL_VARARGS_START(Tcl_Obj *,arg1,argList); |
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434 | dst = objPtr->bytes + oldLength; |
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435 | while (1) { |
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436 | string = va_arg(argList, char *); |
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437 | if (string == NULL) { |
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438 | break; |
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439 | } |
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440 | while (*string != 0) { |
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441 | *dst = *string; |
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442 | dst++; |
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443 | string++; |
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444 | } |
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445 | } |
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446 | |
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447 | /* |
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448 | * Add a null byte to terminate the string. However, be careful: |
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449 | * it's possible that the object is totally empty (if it was empty |
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450 | * originally and there was nothing to append). In this case dst is |
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451 | * NULL; just leave everything alone. |
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452 | */ |
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453 | |
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454 | if (dst != NULL) { |
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455 | *dst = 0; |
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456 | } |
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457 | objPtr->length = newLength; |
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458 | va_end(argList); |
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459 | } |
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460 | |
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461 | /* |
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462 | *---------------------------------------------------------------------- |
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463 | * |
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464 | * ConvertToStringType -- |
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465 | * |
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466 | * This procedure converts the internal representation of an object |
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467 | * to "expandable string" type. |
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468 | * |
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469 | * Results: |
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470 | * None. |
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471 | * |
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472 | * Side effects: |
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473 | * Any old internal reputation for objPtr is freed and the |
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474 | * internal representation is set to that for an expandable string |
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475 | * (the field internalRep.longValue holds 1 less than the allocated |
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476 | * length of objPtr's string representation). |
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477 | * |
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478 | *---------------------------------------------------------------------- |
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479 | */ |
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480 | |
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481 | static void |
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482 | ConvertToStringType(objPtr) |
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483 | register Tcl_Obj *objPtr; /* Pointer to object. Must have a |
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484 | * typePtr that isn't &tclStringType. */ |
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485 | { |
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486 | if (objPtr->typePtr != NULL) { |
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487 | if (objPtr->bytes == NULL) { |
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488 | objPtr->typePtr->updateStringProc(objPtr); |
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489 | } |
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490 | if (objPtr->typePtr->freeIntRepProc != NULL) { |
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491 | objPtr->typePtr->freeIntRepProc(objPtr); |
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492 | } |
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493 | } |
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494 | objPtr->typePtr = &tclStringType; |
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495 | if (objPtr->bytes != NULL) { |
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496 | objPtr->internalRep.longValue = (long)objPtr->length; |
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497 | } else { |
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498 | objPtr->internalRep.longValue = 0; |
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499 | objPtr->length = 0; |
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500 | } |
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501 | } |
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502 | |
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503 | /* |
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504 | *---------------------------------------------------------------------- |
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505 | * |
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506 | * DupStringInternalRep -- |
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507 | * |
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508 | * Initialize the internal representation of a new Tcl_Obj to a |
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509 | * copy of the internal representation of an existing string object. |
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510 | * |
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511 | * Results: |
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512 | * None. |
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513 | * |
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514 | * Side effects: |
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515 | * copyPtr's internal rep is set to a copy of srcPtr's internal |
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516 | * representation. |
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517 | * |
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518 | *---------------------------------------------------------------------- |
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519 | */ |
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520 | |
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521 | static void |
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522 | DupStringInternalRep(srcPtr, copyPtr) |
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523 | register Tcl_Obj *srcPtr; /* Object with internal rep to copy. Must |
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524 | * have an internal representation of type |
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525 | * "expandable string". */ |
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526 | register Tcl_Obj *copyPtr; /* Object with internal rep to set. Must |
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527 | * not currently have an internal rep.*/ |
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528 | { |
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529 | /* |
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530 | * Tricky point: the string value was copied by generic object |
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531 | * management code, so it doesn't contain any extra bytes that |
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532 | * might exist in the source object. |
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533 | */ |
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534 | |
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535 | copyPtr->internalRep.longValue = (long)copyPtr->length; |
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536 | copyPtr->typePtr = &tclStringType; |
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537 | } |
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538 | |
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539 | /* |
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540 | *---------------------------------------------------------------------- |
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541 | * |
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542 | * SetStringFromAny -- |
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543 | * |
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544 | * Create an internal representation of type "expandable string" |
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545 | * for an object. |
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546 | * |
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547 | * Results: |
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548 | * This operation always succeeds and returns TCL_OK. |
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549 | * |
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550 | * Side effects: |
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551 | * This procedure does nothing; there is no advantage in converting |
---|
552 | * the internal representation now, so we just defer it. |
---|
553 | * |
---|
554 | *---------------------------------------------------------------------- |
---|
555 | */ |
---|
556 | |
---|
557 | static int |
---|
558 | SetStringFromAny(interp, objPtr) |
---|
559 | Tcl_Interp *interp; /* Used for error reporting if not NULL. */ |
---|
560 | Tcl_Obj *objPtr; /* The object to convert. */ |
---|
561 | { |
---|
562 | return TCL_OK; |
---|
563 | } |
---|
564 | |
---|
565 | /* |
---|
566 | *---------------------------------------------------------------------- |
---|
567 | * |
---|
568 | * UpdateStringOfString -- |
---|
569 | * |
---|
570 | * Update the string representation for an object whose internal |
---|
571 | * representation is "expandable string". |
---|
572 | * |
---|
573 | * Results: |
---|
574 | * None. |
---|
575 | * |
---|
576 | * Side effects: |
---|
577 | * None. |
---|
578 | * |
---|
579 | *---------------------------------------------------------------------- |
---|
580 | */ |
---|
581 | |
---|
582 | static void |
---|
583 | UpdateStringOfString(objPtr) |
---|
584 | Tcl_Obj *objPtr; /* Object with string rep to update. */ |
---|
585 | { |
---|
586 | /* |
---|
587 | * The string is almost always valid already, in which case there's |
---|
588 | * nothing for us to do. The only case we have to worry about is if |
---|
589 | * the object is totally null. In this case, set the string rep to |
---|
590 | * an empty string. |
---|
591 | */ |
---|
592 | |
---|
593 | if (objPtr->bytes == NULL) { |
---|
594 | objPtr->bytes = tclEmptyStringRep; |
---|
595 | objPtr->length = 0; |
---|
596 | } |
---|
597 | return; |
---|
598 | } |
---|