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Annotation of freem/src/iftab.c, revision 1.1.1.1

1.1       snw         1: /*
                      2:  *                            *
                      3:  *                           * *
                      4:  *                          *   *
                      5:  *                     ***************
                      6:  *                      * *       * *
                      7:  *                       *  MUMPS  *
                      8:  *                      * *       * *
                      9:  *                     ***************
                     10:  *                          *   *
                     11:  *                           * *
                     12:  *                            *
                     13:  *
                     14:  *   iftab.c
                     15:  *    implementation of the freem transactions-in-flight symbol table
                     16:  *
                     17:  *  
                     18:  *   Author: Serena Willis <jpw@coherent-logic.com>
                     19:  *    Copyright (C) 1998 MUG Deutschland
                     20:  *    Copyright (C) 2020 Coherent Logic Development LLC
                     21:  *
                     22:  *
                     23:  *   This file is part of FreeM.
                     24:  *
                     25:  *   FreeM is free software: you can redistribute it and/or modify
                     26:  *   it under the terms of the GNU Affero Public License as published by
                     27:  *   the Free Software Foundation, either version 3 of the License, or
                     28:  *   (at your option) any later version.
                     29:  *
                     30:  *   FreeM is distributed in the hope that it will be useful,
                     31:  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
                     32:  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     33:  *   GNU Affero Public License for more details.
                     34:  *
                     35:  *   You should have received a copy of the GNU Affero Public License
                     36:  *   along with FreeM.  If not, see <https://www.gnu.org/licenses/>.
                     37:  *
                     38:  **/
                     39: 
                     40: #include <stdlib.h>
                     41: #include "iftab.h"
                     42: #include "mpsdef.h"
                     43: #include "transact.h"
                     44: 
                     45: iftab *iftab_head;
                     46: 
                     47: iftab *iftab_insert(short action, char *key, char *data, int tlevel)
                     48: {
                     49:     iftab *t;
                     50: 
                     51:     for (t = iftab_head; t != NULL; t = t->next) {
                     52:         
                     53:         if (stcmp (t->key, key) == 0) {
                     54: 
                     55:             /* the key already exists. this is now an update. */
                     56:             free (t->data);
                     57:            
                     58:             t->data = malloc (stlen (data) + 1);
                     59:            NULLPTRCHK(t->data,"iftab_insert");
                     60:            
                     61:             stcpy (t->data, data);
                     62:             t->killed = FALSE;
                     63: 
                     64:             return t;
                     65:         }
                     66: 
                     67:     }
                     68: 
                     69:     /* key did not exist. this is now a true insert. */
                     70: 
                     71:     t = (iftab *) malloc (sizeof (iftab));
                     72:     NULLPTRCHK(t,"iftab_insert");
                     73:     
                     74:     t->key = malloc (stlen (key) + 1);
                     75:     NULLPTRCHK(t->key,"iftab_insert");
                     76:     
                     77:     t->data = malloc (stlen (data) + 1);
                     78:     NULLPTRCHK(t->data,"iftab_insert");
                     79: 
                     80:     stcpy (t->key, key);
                     81:     stcpy (t->data, data);
                     82: 
                     83:     t->killed = FALSE;
                     84:     t->tlevel = tlevel;
                     85:     t->action = action;
                     86: 
                     87:     t->next = iftab_head;
                     88:     iftab_head = t;
                     89: 
                     90:     return t;
                     91: }
                     92: 
                     93: iftab *iftab_retrieve(char *key, char *data)
                     94: {
                     95:     iftab *t;
                     96: 
                     97:     for (t = iftab_head; t != NULL; t = t->next) {
                     98:         if (stcmp (t->key, key) == 0) {
                     99:            
                    100:             data = (char *) malloc (stlen (t->data) + 1);
                    101:            NULLPTRCHK(data,"iftab_retrieve");
                    102:            
                    103:             stcpy (data, t->data);
                    104: 
                    105:             return t;
                    106:         }
                    107:     }
                    108: 
                    109:     return (iftab *) NULL;
                    110: }
                    111: 
                    112: void iftab_delete(char *key)
                    113: {
                    114:     iftab *t = iftab_head;
                    115:     iftab *p = NULL;
                    116: 
                    117: 
                    118:     if ((t != (iftab *) NULL) && (stcmp (t->key, key) == 0)) {
                    119:         iftab_head = t->next;
                    120: 
                    121:         free (t->key);
                    122:         free (t->data);
                    123:         free (t);
                    124:         return;
                    125:     }
                    126: 
                    127:     while ((t != NULL) && (stcmp (t->key, key) != 0)) {
                    128:         p = t;
                    129:         t = t->next;
                    130:     }
                    131: 
                    132:     if (t == NULL) return;
                    133: 
                    134:     p->next = t->next;
                    135:     free (t->key);
                    136:     free (t->data);
                    137:     free (t);
                    138: 
                    139:     return;
                    140: }
                    141: 
                    142: iftab *iftab_kill(char *key)
                    143: {
                    144:     iftab *t;
                    145: 
                    146:     for(t = iftab_head; t != NULL; t = t->next) {
                    147:         if (stcmp (t->key, key) == 0) {
                    148:             t->killed = TRUE;
                    149: 
                    150:             return t;
                    151:         }
                    152:     }
                    153: 
                    154:     t = iftab_insert (kill_sym, key, "\201", tp_level);
                    155:     t->killed = TRUE;
                    156: 
                    157:     return t;
                    158: }
                    159: 
                    160: void iftab_pop_tlevel(int tlevel)
                    161: {
                    162:     iftab *t;
                    163: 
                    164:     for (t = iftab_head; t != NULL; t = t->next) {
                    165:         if (t->tlevel == tlevel) iftab_delete (t->key);
                    166:     }
                    167: }