2.11BSD#431 - /usr/src/new/rn/artsrch.c

   1: /* $Header: artsrch.c,v 4.3 85/05/01 11:35:47 lwall Exp $
   2:  *
   3:  * $Log:	artsrch.c,v $
   4:  * Revision 4.3  85/05/01  11:35:47  lwall
   5:  * Baseline for release with 4.3bsd.
   6:  *
   7:  */
   8: 
   9: #include "EXTERN.h"
  10: #include "common.h"
  11: #include "search.h"
  12: #include "term.h"
  13: #include "util.h"
  14: #include "intrp.h"
  15: #include "bits.h"
  16: #include "kfile.h"
  17: #include "head.h"
  18: #include "final.h"
  19: #include "cheat.h"
  20: #include "ng.h"
  21: #include "artio.h"
  22: #include "INTERN.h"
  23: #include "artsrch.h"
  24: 
  25: void
  26: artsrch_init()
  27: {
  28: #ifdef ARTSEARCH
  29: #ifdef ZEROGLOB
  30:     init_compex(&sub_compex);
  31:     init_compex(&art_compex);
  32: #endif
  33: #endif
  34: }
  35: 
  36: /* search for an article containing some pattern */
  37: 
  38: #ifdef ARTSEARCH
  39: int
  40: art_search(patbuf,patbufsiz,get_cmd)
  41: char *patbuf;               /* if patbuf != buf, get_cmd must */
  42: int patbufsiz;
  43: int get_cmd;                /*   be set to FALSE!!! */
  44: {
  45:     char *pattern;          /* unparsed pattern */
  46:     register char cmdchr = *patbuf; /* what kind of search? */
  47:     register char *s;
  48:     bool backward = cmdchr == '?' || cmdchr == Ctl('p');
  49:                     /* direction of search */
  50:     COMPEX *compex;         /* which compiled expression */
  51:     char *cmdlst = Nullch;      /* list of commands to do */
  52:     int normal_return = SRCH_NOTFOUND;  /* assume no commands */
  53:     bool saltaway = FALSE;      /* store in KILL file? */
  54:     char howmuch;           /* search just the subjects */
  55:     bool doread;            /* search read articles? */
  56:     bool foldcase = TRUE;       /* fold upper and lower case? */
  57: 
  58:     int_count = 0;
  59:     if (cmdchr == '/' || cmdchr == '?') {   /* normal search? */
  60:     if (get_cmd && buf == patbuf)
  61:         if (!finish_command(FALSE)) /* get rest of command */
  62:         return SRCH_ABORT;
  63:     compex = &art_compex;
  64:     if (patbuf[1]) {
  65:         howmuch = 0;
  66:         doread = FALSE;
  67:     }
  68:     else {
  69:         howmuch = art_howmuch;
  70:         doread = art_doread;
  71:     }
  72:     s = cpytill(buf,patbuf+1,cmdchr);/* ok to cpy buf+1 to buf */
  73:     pattern = buf;
  74:     if (*pattern) {
  75:         if (*lastpat)
  76:         free(lastpat);
  77:         lastpat = savestr(pattern);
  78:     }
  79:     if (*s) {           /* modifiers or commands? */
  80:         for (s++; *s && index("Kharc",*s); s++) {
  81:         if (*s == 'h')      /* scan header */
  82:             howmuch = 1;
  83:         else if (*s == 'a') /* scan article */
  84:             howmuch = 2;
  85:         else if (*s == 'r') /* scan read articles */
  86:             doread = TRUE;
  87:         else if (*s == 'K') /* put into KILL file */
  88:             saltaway = TRUE;
  89:         else if (*s == 'c') /* make search case sensitive */
  90:             foldcase = FALSE;
  91:         }
  92:     }
  93:     while (isspace(*s) || *s == ':')
  94:         s++;
  95:     if (*s) {
  96:         if (*s == 'm' || *s == 'M')
  97:         doread = TRUE;
  98:         if (*s == 'k')      /* grandfather clause */
  99:         *s = 'j';
 100:         cmdlst = savestr(s);
 101:         normal_return = SRCH_DONE;
 102:     }
 103:     art_howmuch = howmuch;
 104:     art_doread = doread;
 105:     if (srchahead)
 106:         srchahead = -1;
 107:     }
 108:     else {
 109:     register char *h;
 110: 
 111:     howmuch = 0;            /* just search subjects */
 112:     doread = (cmdchr == Ctl('p'));
 113:     if (cmdchr == Ctl('n'))
 114:         normal_return = SRCH_SUBJDONE;
 115:     compex = &sub_compex;
 116:     pattern = patbuf+1;
 117:     strcpy(pattern,": *");
 118:     h = pattern + strlen(pattern);
 119:     interp(h,patbufsiz - (h-patbuf),"%s");  /* fetch current subject */
 120:     if (cmdchr == 'K') {
 121:         saltaway = TRUE;
 122:         cmdchr = 'k';
 123:     }
 124:     if (cmdchr == 'k') {
 125:         normal_return = SRCH_DONE;
 126:         cmdlst = savestr("j");
 127:         mark_as_read(art);      /* this article has this subject */
 128:         if (!*h) {
 129: #ifdef VERBOSE
 130:         IF(verbose)
 131:             fputs("\nCannot delete null subject.\n",stdout) FLUSH;
 132:         ELSE
 133: #endif
 134: #ifdef TERSE
 135:             fputs("\nNull subject.\n",stdout) FLUSH;
 136: #endif
 137:         return SRCH_ABORT;
 138:         }
 139: #ifdef VERBOSE
 140:         else if (verbose)
 141:         printf("\nMarking subject \"%s\" as read.\n",h) FLUSH;
 142: #endif
 143:     }
 144:     else if (!srchahead)
 145:         srchahead = -1;
 146:     h[24] = '\0';       /* compensate for notesfiles */
 147:     while (*h) {
 148:         if (index("/\\[.^*$'\"",*h) != Nullch)
 149:         *h++ = '.';
 150:         else
 151:         h++;
 152:     }
 153: #ifdef DEBUGGING
 154:     if (debug) {
 155:         printf("\npattern = %s\n",pattern) FLUSH;
 156:     }
 157: #endif
 158:     }
 159:     if ((s = compile(compex,pattern,TRUE,foldcase)) != Nullch) {
 160:                     /* compile regular expression */
 161:     printf("\n%s\n",s) FLUSH;
 162:     return SRCH_ABORT;
 163:     }
 164: #ifdef KILLFILES
 165:     if (saltaway) {
 166:     char saltbuf[LBUFLEN];
 167: 
 168:     s = saltbuf;
 169:     sprintf(s,"/%s/",pattern);
 170:     s += strlen(s);
 171:     if (doread)
 172:         *s++ = 'r';
 173:     if (howmuch==1)
 174:         *s++ = 'h';
 175:     else if (howmuch==2)
 176:         *s++ = 'a';
 177:     *s++ = ':';
 178:     if (!cmdlst)
 179:         cmdlst = savestr("j");
 180:     safecpy(s,cmdlst,LBUFLEN-(s-saltbuf));
 181:     kf_append(saltbuf);
 182:     }
 183: #endif
 184:     if (cmdlst && index(cmdlst,'='))
 185:     normal_return = SRCH_ERROR; /* listing subjects is an error? */
 186:     if (get_cmd) {
 187:     fputs("\nSearching...\n",stdout) FLUSH;
 188:                     /* give them something to read */
 189:     }
 190:     if (backward) {
 191:     if (cmdlst && art < lastart)
 192:         art++;          /* include current article */
 193:     if (doread)
 194:         check_first(absfirst);
 195:     }
 196:     else {
 197:     if (art > lastart)
 198:         art = (doread ? absfirst : firstart) - 1;
 199:     else if (cmdlst && art > absfirst)
 200:         art--;          /* include current article */
 201:     check_first(art);
 202:     }
 203:     if (srchahead > 0) {
 204:     if (!backward)
 205:         art = srchahead - 1;
 206:     srchahead = -1;
 207:     }
 208:     assert(!cmdlst || *cmdlst);
 209:     for (;;) {
 210:     if (int_count) {
 211:         int_count = 0;
 212:         if (cmdlst)
 213:         free(cmdlst);
 214:         return SRCH_INTR;
 215:     }
 216:     if (backward ?
 217:         (--art < absfirst || (!doread && art < firstart)) :
 218:         (++art > lastart)
 219:       ) {           /* out of articles? */
 220:         if (cmdlst)
 221:         free(cmdlst);
 222:         return normal_return;
 223:     }
 224:     /*NOSTRICT*/
 225:     if (doread || !was_read(art)) {
 226:         if (wanted(compex,art,howmuch)) {
 227:                     /* does the shoe fit? */
 228:         if (cmdlst) {
 229:             if (perform(cmdlst,TRUE)) {
 230:             if (cmdlst)
 231:                 free(cmdlst);
 232:             return SRCH_INTR;
 233:             }
 234:         }
 235:         else {
 236:             if (cmdlst)
 237:             free(cmdlst);
 238:             return SRCH_FOUND;
 239:         }
 240:         }
 241:         else if (!cmdlst && ! (art%50)) {
 242:         printf("...%ld",(long)art);
 243:         fflush(stdout);
 244:         }
 245:     }
 246:     }
 247: }
 248: 
 249: /* determine if article fits pattern */
 250: /* returns TRUE if it exists and fits pattern, FALSE otherwise */
 251: 
 252: bool
 253: wanted(compex, artnum, scope)
 254: COMPEX *compex;
 255: ART_NUM artnum;
 256: char scope;
 257: {
 258:     if (!scope) {
 259:     char subj_buf[266];
 260: 
 261:     strcpy(subj_buf, "Subject: ");
 262:     strncpy(subj_buf+9,fetchsubj(artnum,FALSE,FALSE),256);
 263: #ifdef DEBUGGING
 264:     if (debug & DEB_SEARCH_AHEAD)
 265:         printf("%s\n",subj_buf) FLUSH;
 266: #endif
 267:     return execute(compex,subj_buf) != Nullch;
 268:     }
 269: #ifdef CACHESUBJ
 270:     else
 271:     fetchsubj(artnum,FALSE,FALSE);/* might as well get subject handy */
 272: #endif
 273: 
 274:     if (artopen(artnum) == Nullfp)  /* ensure that article is open */
 275:     return FALSE;           /* if not, return NO MATCH */
 276:     scope--;
 277:     while (fgets(buf,LBUFLEN,artfp) != Nullch) {
 278:                     /* for each line of article */
 279:     if (!scope && index(buf,':') == Nullch && *buf != ' ' && *buf != '\t')
 280:                     /* if headers only and out of header */
 281:         return FALSE;       /* say no go */
 282:     if (execute(compex,buf) != Nullch) {
 283:                     /* does pattern matcher match? */
 284:         return TRUE;        /* say Eureka */
 285:     }
 286:     }
 287:     return FALSE;           /* out of article, so no match */
 288: }
 289: #endif

Defined functions