1 #ifndef lint 2 static char *sccsid = "@(#)inv1.c 4.3 (Berkeley) 05/11/89"; 3 #endif 4 5 #include <stdio.h> 6 #include <assert.h> 7 #include "pathnames.h" 8 9 main(argc, argv) 10 char *argv[]; 11 { 12 /* Make inverted file indexes. Reads a stream from mkey which 13 * gives record pointer items and keys. Generates set of files 14 * a. NHASH pointers to file b. 15 * b. lists of record numbers. 16 * c. record pointer items. 17 * 18 * these files are named xxx.ia, xxx.ib, xxx.ic; 19 * where xxx is taken from arg1. 20 * If the files exist they are updated. 21 */ 22 23 FILE *fa, *fb, *fc, *fta, *ftb, *ftc, *fd; 24 int nhash = 256; 25 int appflg = 1; 26 int keepkey = 0, pipein = 0; 27 char nma[100], nmb[100], nmc[100], com[100], nmd[100]; 28 char tmpa[20], tmpb[20], tmpc[20]; 29 char *remove = NULL; 30 int chatty = 0, docs, hashes, fp[2], fr, fw, pfork, pwait, status; 31 int i,j,k; 32 long keys; 33 int iflong =0; 34 char *sortdir; 35 36 sortdir = _PATH_USRTMP; 37 while (argv[1][0] == '-') 38 { 39 switch(argv[1][1]) 40 { 41 case 'h': /* size of hash table */ 42 nhash = atoi (argv[1]+2); 43 break; 44 case 'n': /* new, don't append */ 45 appflg=0; 46 break; 47 case 'a': /* append to old file */ 48 appflg=1; 49 break; 50 case 'v': /* verbose output */ 51 chatty=1; 52 break; 53 case 'd': /* keep keys on file .id for check on searching */ 54 keepkey=1; 55 break; 56 case 'p': /* pipe into sort (saves space, costs time)*/ 57 pipein = 1; 58 break; 59 case 'i': /* input is on file, not stdin */ 60 close(0); 61 if (open(argv[2], 0) != 0) 62 err("Can't read input %s", argv[2]); 63 if (argv[1][2]=='u') /* unlink */ 64 remove = argv[2]; 65 argc--; 66 argv++; 67 break; 68 } 69 argc--; 70 argv++; 71 } 72 strcpy (nma, argc >= 2 ? argv[1] : "Index"); 73 strcpy (nmb, nma); 74 strcpy (nmc, nma); 75 strcpy (nmd, nma); 76 strcat (nma, ".ia"); 77 strcat (nmb, ".ib"); 78 strcat (nmc, ".ic"); 79 strcat (nmd, ".id"); 80 81 sprintf(tmpa, "junk%di", getpid()); 82 if (pipein) 83 { 84 pipe(fp); 85 fr=fp[0]; 86 fw=fp[1]; 87 if ( (pfork=fork()) == 0) 88 { 89 close(fw); 90 close(0); 91 _assert(dup(fr)==0); 92 close(fr); 93 execl(_PATH_SORT, "sort", "-T", sortdir, "-o", tmpa, 0); 94 _assert(0); 95 } 96 _assert(pfork!= -1); 97 close(fr); 98 fta = fopen(_PATH_DEVNULL, "w"); 99 close(fta->_file); 100 fta->_file = fw; 101 } 102 else /* use tmp file */ 103 { 104 fta = fopen(tmpa, "w"); 105 _assert (fta != NULL); 106 } 107 fb = 0; 108 if (appflg ) 109 { 110 if (fb = fopen(nmb, "r")) 111 { 112 sprintf(tmpb, "junk%dj", getpid()); 113 ftb = fopen(tmpb, "w"); 114 if (ftb==NULL) 115 err("Can't get scratch file %s",tmpb); 116 nhash = recopy(ftb, fb, fopen(nma, "r")); 117 fclose(ftb); 118 } 119 else 120 appflg=0; 121 } 122 fc = fopen(nmc, appflg ? "a" : "w"); 123 fd = keepkey ? fopen(nmd, "w") : 0; 124 docs = newkeys(fta, stdin, fc, nhash, fd, &iflong); 125 fclose(stdin); 126 if (remove != NULL) 127 unlink(remove); 128 fclose(fta); 129 if (pipein) 130 { 131 pwait = wait(&status); 132 printf("pfork %o pwait %o status %d\n",pfork,pwait,status); 133 _assert(pwait==pfork); 134 _assert(status==0); 135 } 136 else 137 { 138 sprintf(com, "sort -T %s %s -o %s", sortdir, tmpa, tmpa); 139 system(com); 140 } 141 if (appflg) 142 { 143 sprintf(tmpc, "junk%dk", getpid()); 144 sprintf(com, "mv %s %s", tmpa, tmpc); 145 system(com); 146 sprintf(com, "sort -T %s -m %s %s -o %s", sortdir, 147 tmpb, tmpc, tmpa); 148 system(com); 149 } 150 fta = fopen(tmpa, "r"); 151 fa = fopen(nma, "w"); 152 fb = fopen(nmb, "w"); 153 whash(fta, fa, fb, nhash, iflong, &keys, &hashes); 154 fclose(fta); 155 # ifndef D1 156 unlink(tmpa); 157 # endif 158 if (appflg) 159 { 160 unlink(tmpb); 161 unlink(tmpc); 162 } 163 if (chatty) 164 165 printf ("%ld key occurrences, %d hashes, %d docs\n", 166 keys, hashes, docs); 167 } 168