1 | /**************************************** |
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2 | * Computer Algebra System SINGULAR * |
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3 | ****************************************/ |
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4 | |
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5 | //**************************************************************************/ |
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6 | // |
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7 | // $Id: sing_dbm.cc,v 1.8 1997-08-13 13:51:42 Singular Exp $ |
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8 | // |
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9 | //**************************************************************************/ |
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10 | // 'sing_dbm.cc' containes command to handle dbm-files under |
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11 | // Singular. |
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12 | // |
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13 | //**************************************************************************/ |
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14 | |
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15 | #include "mod2.h" |
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16 | |
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17 | #ifdef HAVE_DBM |
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18 | |
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19 | # include <stdio.h> |
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20 | # include <fcntl.h> |
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21 | # include <errno.h> |
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22 | # include "tok.h" |
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23 | # include "febase.h" |
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24 | # include "mmemory.h" |
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25 | # include "ipid.h" |
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26 | # include "silink.h" |
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27 | # include "sing_dbm.h" |
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28 | |
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29 | /* These are the routines in dbm. */ |
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30 | # include "ndbm.h" |
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31 | typedef struct { |
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32 | DBM *db; // pointer to open database |
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33 | int first; // firstkey to look for? |
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34 | } DBM_info; |
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35 | |
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36 | //**************************************************************************/ |
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37 | BOOLEAN dbOpen(si_link l, short flag) |
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38 | { |
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39 | char *mode = "r"; |
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40 | DBM_info *db; |
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41 | int dbm_flags = O_RDONLY | O_CREAT; // open database readonly as default |
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42 | |
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43 | if((l->mode!=NULL) |
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44 | && ((l->mode[0]=='w')||(l->mode[1]=='w'))) |
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45 | { |
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46 | dbm_flags = O_RDWR | O_CREAT; |
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47 | mode = "rw"; |
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48 | flag|=SI_LINK_WRITE|SI_LINK_READ; |
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49 | } |
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50 | else if(flag & SI_LINK_WRITE) |
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51 | { |
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52 | // request w- open, but mode is not "w" nor "rw" => fail |
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53 | return TRUE; |
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54 | } |
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55 | if (((db = (DBM_info *)Alloc(sizeof *db)) != NULL) |
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56 | &&((db->db = dbm_open(l->name, dbm_flags, 0664 )) != NULL )) |
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57 | { |
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58 | db->first=1; |
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59 | if(flag & SI_LINK_WRITE) |
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60 | SI_LINK_SET_RW_OPEN_P(l); |
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61 | else |
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62 | SI_LINK_SET_R_OPEN_P(l); |
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63 | l->data=(void *)(db); |
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64 | FreeL(l->mode); |
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65 | l->mode=mstrdup(mode); |
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66 | return FALSE; |
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67 | } |
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68 | return TRUE; |
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69 | } |
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70 | |
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71 | //**************************************************************************/ |
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72 | BOOLEAN dbClose(si_link l) |
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73 | { |
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74 | DBM_info *db = (DBM_info *)l->data; |
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75 | |
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76 | dbm_close(db->db); |
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77 | Free((ADDRESS)db,(sizeof *db)); |
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78 | l->data=NULL; |
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79 | SI_LINK_SET_CLOSE_P(l); |
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80 | return FALSE; |
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81 | } |
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82 | |
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83 | //**************************************************************************/ |
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84 | static datum d_value; |
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85 | leftv dbRead2(si_link l, leftv key) |
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86 | { |
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87 | DBM_info *db = (DBM_info *)l->data; |
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88 | leftv v=NULL; |
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89 | datum d_key; |
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90 | |
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91 | if(key!=NULL) |
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92 | { |
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93 | if (key->Typ()==STRING_CMD) |
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94 | { |
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95 | d_key.dptr = (char*)key->Data(); |
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96 | d_key.dsize = strlen(d_key.dptr)+1; |
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97 | d_value = dbm_fetch(db->db, d_key); |
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98 | v=(leftv)Alloc0(sizeof(sleftv)); |
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99 | if (d_value.dptr!=NULL) v->data=mstrdup(d_value.dptr); |
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100 | else v->data=mstrdup(""); |
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101 | v->rtyp=STRING_CMD; |
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102 | } |
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103 | else |
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104 | { |
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105 | WerrorS("read(`DBM link`,`string`) expected"); |
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106 | } |
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107 | } |
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108 | else |
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109 | { |
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110 | if(db->first) |
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111 | d_value = dbm_firstkey((DBM *)db->db); |
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112 | else |
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113 | d_value = dbm_nextkey((DBM *)db->db); |
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114 | |
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115 | v=(leftv)Alloc0(sizeof(sleftv)); |
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116 | v->rtyp=STRING_CMD; |
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117 | if (d_value.dptr!=NULL) |
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118 | { |
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119 | v->data=mstrdup(d_value.dptr); |
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120 | db->first = 0; |
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121 | } |
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122 | else |
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123 | { |
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124 | v->data=mstrdup(""); |
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125 | db->first = 1; |
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126 | } |
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127 | |
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128 | } |
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129 | return v; |
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130 | } |
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131 | leftv dbRead1(si_link l) |
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132 | { |
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133 | return dbRead2(l,NULL); |
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134 | } |
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135 | //**************************************************************************/ |
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136 | BOOLEAN dbWrite(si_link l, leftv key) |
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137 | { |
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138 | DBM_info *db = (DBM_info *)l->data; |
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139 | BOOLEAN b=TRUE; |
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140 | register int ret; |
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141 | |
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142 | // database is opened |
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143 | if((key!=NULL) && (key->Typ()==STRING_CMD) ) |
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144 | { |
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145 | if (key->next!=NULL) // have a second parameter ? |
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146 | { |
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147 | if(key->next->Typ()==STRING_CMD) // replace (key,value) |
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148 | { |
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149 | datum d_key, d_value; |
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150 | |
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151 | d_key.dptr = (char *)key->Data(); |
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152 | d_key.dsize = strlen(d_key.dptr)+1; |
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153 | d_value.dptr = (char *)key->next->Data(); |
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154 | d_value.dsize = strlen(d_value.dptr)+1; |
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155 | ret = dbm_store(db->db, d_key, d_value, DBM_REPLACE); |
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156 | if(!ret ) |
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157 | b=FALSE; |
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158 | else |
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159 | { |
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160 | if(dbm_error(db->db)) |
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161 | { |
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162 | Werror("DBM link I/O error. Is '%s' readonly?", l->name); |
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163 | dbm_clearerr(db->db); |
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164 | } |
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165 | } |
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166 | } |
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167 | } |
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168 | else |
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169 | { // delete (key) |
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170 | datum d_key; |
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171 | |
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172 | d_key.dptr = (char *)key->Data(); |
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173 | d_key.dsize = strlen(d_key.dptr)+1; |
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174 | dbm_delete(db->db, d_key); |
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175 | b=FALSE; |
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176 | } |
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177 | } |
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178 | else |
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179 | { |
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180 | WerrorS("write(`DBM link`,`key string` [,`data string`]) expected"); |
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181 | } |
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182 | return b; |
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183 | } |
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184 | //**************************************************************************/ |
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185 | //char *dbStatus(si_link l, char *request) |
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186 | //{ |
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187 | // if (strcmp(request, "read") == 0) |
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188 | // { |
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189 | // if (SI_LINK_R_OPEN_P(l)) |
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190 | // return "ready"; |
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191 | // else |
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192 | // return "not ready"; |
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193 | // } |
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194 | // else if (strcmp(request, "write") == 0) |
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195 | // { |
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196 | // if (SI_LINK_W_OPEN_P(l)) |
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197 | // return "ready"; |
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198 | // else |
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199 | // return "not ready"; |
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200 | // } |
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201 | // else return "unknown status request"; |
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202 | //} |
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203 | //**************************************************************************/ |
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204 | si_link_extension slInitDBMExtension(si_link_extension s) |
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205 | { |
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206 | s->Open=dbOpen; |
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207 | s->Close=dbClose; |
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208 | s->Read=dbRead1; |
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209 | s->Read2=dbRead2; |
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210 | s->Write=dbWrite; |
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211 | //s->Dump=NULL; |
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212 | //s->GetDump=NULL; |
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213 | //s->Status=dbStatus; |
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214 | s->Status=slStatusAscii; |
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215 | s->type="DBM"; |
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216 | return s; |
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217 | } |
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218 | #endif /* HAVE_DBM */ |
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