annotate lib/obstack.c @ 881:bdd51dfe45e2

new obstack from libc
author Jim Meyering <jim@meyering.net>
date Tue, 04 Feb 1997 03:20:29 +0000
parents d183d24934d4
children f98b28e4e063
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1 /* obstack.c - subroutines used implicitly by object stack macros
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2 Copyright (C) 1988,89,90,91,92,93,94,96 Free Software Foundation, Inc.
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3
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4 This file is part of the GNU C Library. Its master source is NOT part of
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5 the C library, however. The master source lives in /gd/gnu/lib.
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6
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7 The GNU C Library is free software; you can redistribute it and/or
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8 modify it under the terms of the GNU Library General Public License as
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9 published by the Free Software Foundation; either version 2 of the
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10 License, or (at your option) any later version.
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11
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12 The GNU C Library is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 Library General Public License for more details.
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16
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17 You should have received a copy of the GNU Library General Public
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18 License along with the GNU C Library; see the file COPYING.LIB. If not,
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19 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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20 Boston, MA 02111-1307, USA. */
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21
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22 #include "obstack.h"
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23
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24 /* NOTE BEFORE MODIFYING THIS FILE: This version number must be
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25 incremented whenever callers compiled using an old obstack.h can no
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26 longer properly call the functions in this obstack.c. */
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27 #define OBSTACK_INTERFACE_VERSION 1
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29 /* Comment out all this code if we are using the GNU C Library, and are not
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30 actually compiling the library itself, and the installed library
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31 supports the same library interface we do. This code is part of the GNU
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32 C Library, but also included in many other GNU distributions. Compiling
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33 and linking in this code is a waste when using the GNU C library
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34 (especially if it is a shared library). Rather than having every GNU
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35 program understand `configure --with-gnu-libc' and omit the object
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36 files, it is simpler to just do this in the source for each such file. */
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37
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38 #include <stdio.h> /* Random thing to get __GNU_LIBRARY__. */
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39 #if !defined (_LIBC) && defined (__GNU_LIBRARY__) && __GNU_LIBRARY__ > 1
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40 #include <gnu-versions.h>
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41 #if _GNU_OBSTACK_INTERFACE_VERSION == OBSTACK_INTERFACE_VERSION
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42 #define ELIDE_CODE
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43 #endif
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44 #endif
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45
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46
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47 #ifndef ELIDE_CODE
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49
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50 #if defined (__STDC__) && __STDC__
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51 #define POINTER void *
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52 #else
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53 #define POINTER char *
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54 #endif
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55
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56 /* Determine default alignment. */
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57 struct fooalign {char x; double d;};
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58 #define DEFAULT_ALIGNMENT \
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59 ((PTR_INT_TYPE) ((char *) &((struct fooalign *) 0)->d - (char *) 0))
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60 /* If malloc were really smart, it would round addresses to DEFAULT_ALIGNMENT.
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61 But in fact it might be less smart and round addresses to as much as
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62 DEFAULT_ROUNDING. So we prepare for it to do that. */
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63 union fooround {long x; double d;};
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64 #define DEFAULT_ROUNDING (sizeof (union fooround))
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65
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66 /* When we copy a long block of data, this is the unit to do it with.
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67 On some machines, copying successive ints does not work;
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68 in such a case, redefine COPYING_UNIT to `long' (if that works)
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69 or `char' as a last resort. */
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70 #ifndef COPYING_UNIT
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71 #define COPYING_UNIT int
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72 #endif
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73
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75 /* The functions allocating more room by calling `obstack_chunk_alloc'
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76 jump to the handler pointed to by `obstack_alloc_failed_handler'.
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77 This variable by default points to the internal function
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78 `print_and_abort'. */
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79 #if defined (__STDC__) && __STDC__
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80 static void print_and_abort (void);
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81 void (*obstack_alloc_failed_handler) (void) = print_and_abort;
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82 #else
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83 static void print_and_abort ();
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84 void (*obstack_alloc_failed_handler) () = print_and_abort;
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85 #endif
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86
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87 /* Exit value used when `print_and_abort' is used. */
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88 #if defined (__STDC__) && __STDC__
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89 #include <stdlib.h>
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90 #endif
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91 #ifndef EXIT_FAILURE
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92 #define EXIT_FAILURE 1
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93 #endif
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94 int obstack_exit_failure = EXIT_FAILURE;
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95
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96 /* The non-GNU-C macros copy the obstack into this global variable
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97 to avoid multiple evaluation. */
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98
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99 struct obstack *_obstack;
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100
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101 /* Define a macro that either calls functions with the traditional malloc/free
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102 calling interface, or calls functions with the mmalloc/mfree interface
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103 (that adds an extra first argument), based on the state of use_extra_arg.
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104 For free, do not use ?:, since some compilers, like the MIPS compilers,
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105 do not allow (expr) ? void : void. */
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106
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107 #if defined (__STDC__) && __STDC__
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108 #define CALL_CHUNKFUN(h, size) \
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109 (((h) -> use_extra_arg) \
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110 ? (*(h)->chunkfun) ((h)->extra_arg, (size)) \
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111 : (*(struct _obstack_chunk *(*) (long)) (h)->chunkfun) ((size)))
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112
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113 #define CALL_FREEFUN(h, old_chunk) \
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114 do { \
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115 if ((h) -> use_extra_arg) \
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116 (*(h)->freefun) ((h)->extra_arg, (old_chunk)); \
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117 else \
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118 (*(void (*) (void *)) (h)->freefun) ((old_chunk)); \
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119 } while (0)
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120 #else
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121 #define CALL_CHUNKFUN(h, size) \
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122 (((h) -> use_extra_arg) \
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123 ? (*(h)->chunkfun) ((h)->extra_arg, (size)) \
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124 : (*(struct _obstack_chunk *(*) ()) (h)->chunkfun) ((size)))
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125
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126 #define CALL_FREEFUN(h, old_chunk) \
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127 do { \
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128 if ((h) -> use_extra_arg) \
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129 (*(h)->freefun) ((h)->extra_arg, (old_chunk)); \
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130 else \
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131 (*(void (*) ()) (h)->freefun) ((old_chunk)); \
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132 } while (0)
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133 #endif
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135
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136 /* Initialize an obstack H for use. Specify chunk size SIZE (0 means default).
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137 Objects start on multiples of ALIGNMENT (0 means use default).
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138 CHUNKFUN is the function to use to allocate chunks,
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139 and FREEFUN the function to free them.
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140
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141 Return nonzero if successful, zero if out of memory.
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142 To recover from an out of memory error,
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143 free up some memory, then call this again. */
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144
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145 int
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146 _obstack_begin (h, size, alignment, chunkfun, freefun)
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147 struct obstack *h;
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148 int size;
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149 int alignment;
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150 #if defined (__STDC__) && __STDC__
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151 POINTER (*chunkfun) (long);
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152 void (*freefun) (void *);
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153 #else
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154 POINTER (*chunkfun) ();
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155 void (*freefun) ();
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156 #endif
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157 {
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158 register struct _obstack_chunk *chunk; /* points to new chunk */
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159
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160 if (alignment == 0)
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161 alignment = DEFAULT_ALIGNMENT;
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162 if (size == 0)
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163 /* Default size is what GNU malloc can fit in a 4096-byte block. */
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164 {
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165 /* 12 is sizeof (mhead) and 4 is EXTRA from GNU malloc.
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166 Use the values for range checking, because if range checking is off,
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167 the extra bytes won't be missed terribly, but if range checking is on
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168 and we used a larger request, a whole extra 4096 bytes would be
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169 allocated.
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170
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171 These number are irrelevant to the new GNU malloc. I suspect it is
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172 less sensitive to the size of the request. */
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173 int extra = ((((12 + DEFAULT_ROUNDING - 1) & ~(DEFAULT_ROUNDING - 1))
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174 + 4 + DEFAULT_ROUNDING - 1)
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175 & ~(DEFAULT_ROUNDING - 1));
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176 size = 4096 - extra;
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177 }
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178
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179 #if defined (__STDC__) && __STDC__
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180 h->chunkfun = (struct _obstack_chunk * (*)(void *, long)) chunkfun;
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181 h->freefun = (void (*) (void *, struct _obstack_chunk *)) freefun;
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182 #else
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183 h->chunkfun = (struct _obstack_chunk * (*)()) chunkfun;
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184 h->freefun = freefun;
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185 #endif
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186 h->chunk_size = size;
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187 h->alignment_mask = alignment - 1;
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188 h->use_extra_arg = 0;
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189
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190 chunk = h->chunk = CALL_CHUNKFUN (h, h -> chunk_size);
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191 if (!chunk)
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192 (*obstack_alloc_failed_handler) ();
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193 h->next_free = h->object_base = chunk->contents;
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194 h->chunk_limit = chunk->limit
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195 = (char *) chunk + h->chunk_size;
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196 chunk->prev = 0;
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197 /* The initial chunk now contains no empty object. */
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198 h->maybe_empty_object = 0;
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199 h->alloc_failed = 0;
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200 return 1;
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201 }
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202
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203 int
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204 _obstack_begin_1 (h, size, alignment, chunkfun, freefun, arg)
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205 struct obstack *h;
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206 int size;
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207 int alignment;
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208 #if defined (__STDC__) && __STDC__
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209 POINTER (*chunkfun) (POINTER, long);
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210 void (*freefun) (POINTER, POINTER);
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211 #else
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212 POINTER (*chunkfun) ();
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213 void (*freefun) ();
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214 #endif
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215 POINTER arg;
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216 {
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217 register struct _obstack_chunk *chunk; /* points to new chunk */
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218
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219 if (alignment == 0)
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220 alignment = DEFAULT_ALIGNMENT;
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221 if (size == 0)
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222 /* Default size is what GNU malloc can fit in a 4096-byte block. */
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223 {
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224 /* 12 is sizeof (mhead) and 4 is EXTRA from GNU malloc.
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225 Use the values for range checking, because if range checking is off,
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226 the extra bytes won't be missed terribly, but if range checking is on
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227 and we used a larger request, a whole extra 4096 bytes would be
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228 allocated.
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229
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230 These number are irrelevant to the new GNU malloc. I suspect it is
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231 less sensitive to the size of the request. */
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232 int extra = ((((12 + DEFAULT_ROUNDING - 1) & ~(DEFAULT_ROUNDING - 1))
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233 + 4 + DEFAULT_ROUNDING - 1)
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234 & ~(DEFAULT_ROUNDING - 1));
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235 size = 4096 - extra;
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236 }
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237
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238 #if defined(__STDC__) && __STDC__
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239 h->chunkfun = (struct _obstack_chunk * (*)(void *,long)) chunkfun;
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240 h->freefun = (void (*) (void *, struct _obstack_chunk *)) freefun;
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241 #else
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242 h->chunkfun = (struct _obstack_chunk * (*)()) chunkfun;
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243 h->freefun = freefun;
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244 #endif
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245 h->chunk_size = size;
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246 h->alignment_mask = alignment - 1;
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247 h->extra_arg = arg;
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248 h->use_extra_arg = 1;
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249
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250 chunk = h->chunk = CALL_CHUNKFUN (h, h -> chunk_size);
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251 if (!chunk)
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252 (*obstack_alloc_failed_handler) ();
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253 h->next_free = h->object_base = chunk->contents;
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254 h->chunk_limit = chunk->limit
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255 = (char *) chunk + h->chunk_size;
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256 chunk->prev = 0;
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257 /* The initial chunk now contains no empty object. */
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258 h->maybe_empty_object = 0;
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259 h->alloc_failed = 0;
334
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260 return 1;
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261 }
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262
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263 /* Allocate a new current chunk for the obstack *H
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264 on the assumption that LENGTH bytes need to be added
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265 to the current object, or a new object of length LENGTH allocated.
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266 Copies any partial object from the end of the old chunk
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267 to the beginning of the new one. */
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268
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269 void
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270 _obstack_newchunk (h, length)
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271 struct obstack *h;
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272 int length;
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273 {
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274 register struct _obstack_chunk *old_chunk = h->chunk;
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275 register struct _obstack_chunk *new_chunk;
334
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276 register long new_size;
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277 register int obj_size = h->next_free - h->object_base;
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278 register int i;
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279 int already;
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280
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281 /* Compute size for new chunk. */
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282 new_size = (obj_size + length) + (obj_size >> 3) + 100;
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283 if (new_size < h->chunk_size)
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284 new_size = h->chunk_size;
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285
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286 /* Allocate and initialize the new chunk. */
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287 new_chunk = CALL_CHUNKFUN (h, new_size);
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288 if (!new_chunk)
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289 (*obstack_alloc_failed_handler) ();
334
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290 h->chunk = new_chunk;
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291 new_chunk->prev = old_chunk;
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292 new_chunk->limit = h->chunk_limit = (char *) new_chunk + new_size;
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293
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294 /* Move the existing object to the new chunk.
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295 Word at a time is fast and is safe if the object
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296 is sufficiently aligned. */
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297 if (h->alignment_mask + 1 >= DEFAULT_ALIGNMENT)
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298 {
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299 for (i = obj_size / sizeof (COPYING_UNIT) - 1;
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300 i >= 0; i--)
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301 ((COPYING_UNIT *)new_chunk->contents)[i]
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302 = ((COPYING_UNIT *)h->object_base)[i];
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303 /* We used to copy the odd few remaining bytes as one extra COPYING_UNIT,
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304 but that can cross a page boundary on a machine
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305 which does not do strict alignment for COPYING_UNITS. */
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306 already = obj_size / sizeof (COPYING_UNIT) * sizeof (COPYING_UNIT);
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307 }
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308 else
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309 already = 0;
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310 /* Copy remaining bytes one by one. */
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311 for (i = already; i < obj_size; i++)
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312 new_chunk->contents[i] = h->object_base[i];
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313
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314 /* If the object just copied was the only data in OLD_CHUNK,
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315 free that chunk and remove it from the chain.
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316 But not if that chunk might contain an empty object. */
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317 if (h->object_base == old_chunk->contents && ! h->maybe_empty_object)
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318 {
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319 new_chunk->prev = old_chunk->prev;
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320 CALL_FREEFUN (h, old_chunk);
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321 }
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322
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323 h->object_base = new_chunk->contents;
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324 h->next_free = h->object_base + obj_size;
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325 /* The new chunk certainly contains no empty object yet. */
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326 h->maybe_empty_object = 0;
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327 }
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328
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329 /* Return nonzero if object OBJ has been allocated from obstack H.
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330 This is here for debugging.
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331 If you use it in a program, you are probably losing. */
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332
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333 #if defined (__STDC__) && __STDC__
334
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334 /* Suppress -Wmissing-prototypes warning. We don't want to declare this in
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335 obstack.h because it is just for debugging. */
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336 int _obstack_allocated_p (struct obstack *h, POINTER obj);
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337 #endif
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338
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339 int
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340 _obstack_allocated_p (h, obj)
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341 struct obstack *h;
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342 POINTER obj;
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343 {
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344 register struct _obstack_chunk *lp; /* below addr of any objects in this chunk */
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345 register struct _obstack_chunk *plp; /* point to previous chunk if any */
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346
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347 lp = (h)->chunk;
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348 /* We use >= rather than > since the object cannot be exactly at
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349 the beginning of the chunk but might be an empty object exactly
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350 at the end of an adjacent chunk. */
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351 while (lp != 0 && ((POINTER) lp >= obj || (POINTER) (lp)->limit < obj))
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352 {
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353 plp = lp->prev;
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354 lp = plp;
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355 }
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356 return lp != 0;
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357 }
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358
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359 /* Free objects in obstack H, including OBJ and everything allocate
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360 more recently than OBJ. If OBJ is zero, free everything in H. */
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361
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362 #undef obstack_free
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363
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364 /* This function has two names with identical definitions.
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365 This is the first one, called from non-ANSI code. */
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366
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367 void
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368 _obstack_free (h, obj)
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369 struct obstack *h;
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370 POINTER obj;
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371 {
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372 register struct _obstack_chunk *lp; /* below addr of any objects in this chunk */
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373 register struct _obstack_chunk *plp; /* point to previous chunk if any */
334
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374
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375 lp = h->chunk;
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376 /* We use >= because there cannot be an object at the beginning of a chunk.
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377 But there can be an empty object at that address
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378 at the end of another chunk. */
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379 while (lp != 0 && ((POINTER) lp >= obj || (POINTER) (lp)->limit < obj))
334
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380 {
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381 plp = lp->prev;
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382 CALL_FREEFUN (h, lp);
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383 lp = plp;
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384 /* If we switch chunks, we can't tell whether the new current
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385 chunk contains an empty object, so assume that it may. */
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386 h->maybe_empty_object = 1;
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387 }
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388 if (lp)
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389 {
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390 h->object_base = h->next_free = (char *) (obj);
334
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391 h->chunk_limit = lp->limit;
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392 h->chunk = lp;
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393 }
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394 else if (obj != 0)
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395 /* obj is not in any of the chunks! */
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396 abort ();
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397 }
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398
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399 /* This function is used from ANSI code. */
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400
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401 void
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402 obstack_free (h, obj)
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403 struct obstack *h;
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404 POINTER obj;
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405 {
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406 register struct _obstack_chunk *lp; /* below addr of any objects in this chunk */
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407 register struct _obstack_chunk *plp; /* point to previous chunk if any */
334
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408
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409 lp = h->chunk;
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410 /* We use >= because there cannot be an object at the beginning of a chunk.
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411 But there can be an empty object at that address
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412 at the end of another chunk. */
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413 while (lp != 0 && ((POINTER) lp >= obj || (POINTER) (lp)->limit < obj))
334
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414 {
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415 plp = lp->prev;
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416 CALL_FREEFUN (h, lp);
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417 lp = plp;
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418 /* If we switch chunks, we can't tell whether the new current
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419 chunk contains an empty object, so assume that it may. */
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420 h->maybe_empty_object = 1;
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421 }
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422 if (lp)
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423 {
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424 h->object_base = h->next_free = (char *) (obj);
334
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425 h->chunk_limit = lp->limit;
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426 h->chunk = lp;
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427 }
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428 else if (obj != 0)
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429 /* obj is not in any of the chunks! */
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430 abort ();
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431 }
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432
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433 int
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434 _obstack_memory_used (h)
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435 struct obstack *h;
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436 {
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437 register struct _obstack_chunk* lp;
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438 register int nbytes = 0;
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439
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440 for (lp = h->chunk; lp != 0; lp = lp->prev)
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441 {
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442 nbytes += lp->limit - (char *) lp;
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443 }
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444 return nbytes;
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445 }
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446
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447 /* Define the error handler. */
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448 #ifndef _
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449 # ifdef HAVE_LIBINTL_H
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450 # include <libintl.h>
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451 # ifndef _
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452 # define _(Str) gettext (Str)
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453 # endif
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454 # else
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455 # define _(Str) (Str)
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456 # endif
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457 #endif
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458
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459 static void
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460 print_and_abort ()
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461 {
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462 fputs (_("memory exhausted\n"), stderr);
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463 exit (obstack_exit_failure);
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464 }
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465
334
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466 #if 0
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467 /* These are now turned off because the applications do not use it
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468 and it uses bcopy via obstack_grow, which causes trouble on sysV. */
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469
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470 /* Now define the functional versions of the obstack macros.
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471 Define them to simply use the corresponding macros to do the job. */
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diff changeset
472
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diff changeset
473 #if defined (__STDC__) && __STDC__
334
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474 /* These function definitions do not work with non-ANSI preprocessors;
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475 they won't pass through the macro names in parentheses. */
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diff changeset
476
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diff changeset
477 /* The function names appear in parentheses in order to prevent
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diff changeset
478 the macro-definitions of the names from being expanded there. */
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parents:
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479
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480 POINTER (obstack_base) (obstack)
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481 struct obstack *obstack;
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482 {
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483 return obstack_base (obstack);
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484 }
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diff changeset
485
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diff changeset
486 POINTER (obstack_next_free) (obstack)
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487 struct obstack *obstack;
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488 {
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489 return obstack_next_free (obstack);
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490 }
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491
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492 int (obstack_object_size) (obstack)
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493 struct obstack *obstack;
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494 {
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495 return obstack_object_size (obstack);
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496 }
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497
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498 int (obstack_room) (obstack)
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499 struct obstack *obstack;
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500 {
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501 return obstack_room (obstack);
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502 }
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503
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504 int (obstack_make_room) (obstack, length)
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505 struct obstack *obstack;
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506 int length;
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507 {
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508 return obstack_make_room (obstack, length);
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509 }
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510
334
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511 void (obstack_grow) (obstack, pointer, length)
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512 struct obstack *obstack;
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513 POINTER pointer;
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514 int length;
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515 {
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516 obstack_grow (obstack, pointer, length);
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517 }
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518
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519 void (obstack_grow0) (obstack, pointer, length)
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520 struct obstack *obstack;
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521 POINTER pointer;
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522 int length;
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523 {
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524 obstack_grow0 (obstack, pointer, length);
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525 }
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526
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527 void (obstack_1grow) (obstack, character)
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528 struct obstack *obstack;
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529 int character;
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530 {
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531 obstack_1grow (obstack, character);
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532 }
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533
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534 void (obstack_blank) (obstack, length)
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535 struct obstack *obstack;
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536 int length;
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537 {
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538 obstack_blank (obstack, length);
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539 }
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540
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541 void (obstack_1grow_fast) (obstack, character)
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542 struct obstack *obstack;
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543 int character;
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544 {
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545 obstack_1grow_fast (obstack, character);
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546 }
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547
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548 void (obstack_blank_fast) (obstack, length)
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549 struct obstack *obstack;
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550 int length;
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551 {
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552 obstack_blank_fast (obstack, length);
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553 }
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554
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555 POINTER (obstack_finish) (obstack)
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556 struct obstack *obstack;
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557 {
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558 return obstack_finish (obstack);
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559 }
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560
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561 POINTER (obstack_alloc) (obstack, length)
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562 struct obstack *obstack;
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563 int length;
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564 {
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565 return obstack_alloc (obstack, length);
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566 }
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567
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568 POINTER (obstack_copy) (obstack, pointer, length)
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Jim Meyering <jim@meyering.net>
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569 struct obstack *obstack;
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570 POINTER pointer;
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571 int length;
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572 {
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573 return obstack_copy (obstack, pointer, length);
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574 }
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575
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576 POINTER (obstack_copy0) (obstack, pointer, length)
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577 struct obstack *obstack;
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578 POINTER pointer;
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579 int length;
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580 {
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581 return obstack_copy0 (obstack, pointer, length);
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582 }
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583
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584 #endif /* __STDC__ */
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585
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586 #endif /* 0 */
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587
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588 #endif /* !ELIDE_CODE */