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annotate ueda/libunet/nethash.c @ 142:7bdce91da1a5

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unet-excise utility added
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 19 Sep 2020 22:50:24 +0000
parents 73abf2c13884
children
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73abf2c13884 libunet: nethash functions implemented
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1 /*
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2 * This module provides library functions for managing the list of NET objects
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3 * read from unet files.
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4 */
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5
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6 #include <stdio.h>
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7 #include <stdlib.h>
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8 #include <string.h>
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9 #include <strings.h>
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10 #include "nethash.h"
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12 struct net *net_list_head;
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13 int longest_net_name;
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14
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15 #define HASH_SIZE 1103
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16 static struct net *hashtab[HASH_SIZE];
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17 static struct net **global_tailp = &net_list_head;
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18
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19 static int
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20 hash_netname(str)
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21 char *str;
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22 {
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23 register u_long accum = 0;
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24 register char *cp;
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25 register int c, i;
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26
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27 for (cp = str, i = 1; c = *cp; cp++, i++)
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28 accum += c * i;
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29 return(accum % HASH_SIZE);
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30 }
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31
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32 struct net *
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33 enter_net_object(netname, extra_alloc)
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34 char *netname;
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35 unsigned extra_alloc;
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36 {
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37 register struct net *n, **np;
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38 int namelen;
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39
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40 for (np = hashtab + hash_netname(netname); n = *np; np = &n->nextinhash)
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41 if (!strcmp(n->name, netname)) {
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42 fprintf(stderr, "error: duplicate NET name %s\n",
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43 netname);
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44 exit(1);
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45 }
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46 namelen = strlen(netname);
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47 if (namelen > longest_net_name)
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48 longest_net_name = namelen;
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49 n = (struct net *) malloc(sizeof(struct net) + extra_alloc +
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50 namelen + 1);
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51 if (!n) {
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52 perror("malloc");
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53 exit(1);
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54 }
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55 n->name = (char *)(n + 1) + extra_alloc;
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56 strcpy(n->name, netname);
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57 n->nextinlist = 0;
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58 n->nextinhash = 0;
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59 *np = n;
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60 *global_tailp = n;
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61 global_tailp = &n->nextinlist;
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62 return n;
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63 }
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64
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65 struct net *
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66 find_net_by_name(soughtname)
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67 register char *soughtname;
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68 {
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69 register struct net *n;
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70
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71 for (n = hashtab[hash_netname(soughtname)]; n; n = n->nextinhash)
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72 if (!strcmp(n->name, soughtname))
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73 return(n);
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74 fprintf(stderr, "error: no net named \"%s\"\n", soughtname);
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75 exit(1);
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76 }