4.3BSD - /usr/src/new/rn/head.c

   1: /* $Header: head.c,v 4.3.1.2 85/05/10 13:47:25 lwall Exp $
   2:  *
   3:  * $Log:	head.c,v $
   4:  * Revision 4.3.1.2  85/05/10  13:47:25  lwall
   5:  * Added debugging stuff.
   6:  *
   7:  * Revision 4.3.1.1  85/05/10  11:32:30  lwall
   8:  * Branch for patches.
   9:  *
  10:  * Revision 4.3  85/05/01  11:38:21  lwall
  11:  * Baseline for release with 4.3bsd.
  12:  *
  13:  */
  14: 
  15: #include "EXTERN.h"
  16: #include "common.h"
  17: #include "artio.h"
  18: #include "bits.h"
  19: #include "util.h"
  20: #include "INTERN.h"
  21: #include "head.h"
  22: 
  23: bool first_one;     /* is this the 1st occurance of this header line? */
  24: 
  25: static char htypeix[26] =
  26:     {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
  27: 
  28: void
  29: head_init()
  30: {
  31:     register int i;
  32: 
  33:     for (i=HEAD_FIRST+1; i<HEAD_LAST; i++)
  34:     htypeix[*htype[i].ht_name - 'a'] = i;
  35: }
  36: 
  37: #ifdef DEBUGGING
  38: dumpheader(where)
  39: char *where;
  40: {
  41:     register int i;
  42: 
  43:     printf("header: %d %s", parsed_art, where);
  44: 
  45:     for (i=0; i<HEAD_LAST; i++) {
  46:     printf("%15s %4d %4d %03o\n",htype[i].ht_name,
  47:         htype[i].ht_minpos,
  48:         htype[i].ht_maxpos,
  49:         htype[i].ht_flags) FLUSH;
  50:     }
  51: }
  52: #endif
  53: 
  54: int
  55: set_line_type(bufptr,colon)
  56: char *bufptr;
  57: register char *colon;
  58: {
  59:     char lc[LONGKEY+3];
  60:     register char *t, *f;
  61:     register int i, len;
  62: 
  63:     for (t=lc,f=bufptr; f<colon; f++, t++) {
  64:     if (isspace(*f))
  65:     /* guard against space before : */
  66:         break;
  67:     *t = isupper(*f) ? tolower(*f) : *f;
  68:     }
  69:     *t = '\0';
  70:     f = lc;             /* get lc into register */
  71:     len = t - f;
  72: 
  73:     /* now scan the headtype table, backwards so we don't have to supply an
  74:      * extra terminating value, using first letter as index, and length as
  75:      * optimization to avoid calling subroutine strEQ unnecessarily.  Hauls.
  76:      */
  77: 
  78:     if (islower(*f)) {
  79:     for (i = htypeix[*f - 'a']; *htype[i].ht_name == *f; --i) {
  80:         if (len == htype[i].ht_length && strEQ(f, htype[i].ht_name)) {
  81:         return i;
  82:         }
  83:     }
  84:     }
  85:     return SOME_LINE;
  86: }
  87: 
  88: void
  89: start_header(artnum)
  90: ART_NUM artnum;
  91: {
  92:     register int i;
  93: 
  94: #ifdef DEBUGGING
  95:     if (debug & 4)
  96:     dumpheader("start_header\n");
  97: #endif
  98:     for (i=0; i<HEAD_LAST; i++) {
  99:     htype[i].ht_minpos = -1;
 100:     htype[i].ht_maxpos = 0;
 101:     }
 102:     in_header = SOME_LINE;
 103:     first_one = FALSE;
 104: #ifdef ASYNC_PARSE
 105:     parsed_art = artnum;
 106: #endif
 107: }
 108: 
 109: bool
 110: parseline(art_buf,newhide,oldhide)
 111: char *art_buf;
 112: int newhide, oldhide;
 113: {
 114:     if (*art_buf == ' ' || *art_buf == '\t')
 115:                     /* header continuation line? */
 116:     return oldhide;
 117:     else {              /* maybe another header line */
 118:     char *s;
 119: 
 120:     if (first_one) {        /* did we just pass 1st occurance? */
 121:         first_one = FALSE;
 122:         htype[in_header].ht_maxpos = artpos;
 123:                     /* remember where line left off */
 124:     }
 125:     s = index(art_buf,':');
 126:     if (s == Nullch || s-art_buf > LONGKEY+2) {
 127:                 /* is it the end of the header? */
 128:         htype[PAST_HEADER].ht_minpos =
 129:         (*art_buf == '\n') ? ftell(artfp) : artpos;
 130:                 /* remember where body starts */
 131:         in_header = PAST_HEADER;
 132:     }
 133:     else {  /* it is a new header line */
 134:         in_header = set_line_type(art_buf,s);
 135:         first_one = (htype[in_header].ht_minpos < 0);
 136:         if (first_one)
 137:         htype[in_header].ht_minpos = artpos;
 138: #ifdef DEBUGGING
 139:         if (debug & 4)
 140:         dumpheader(art_buf);
 141: #endif
 142:         if (htype[in_header].ht_flags & HT_HIDE)
 143:         return newhide;
 144:     }
 145:     }
 146:     return FALSE;           /* don't hide this line */
 147: }
 148: 
 149: #ifdef ASYNC_PARSE
 150: int
 151: parse_maybe(artnum)
 152: ART_NUM artnum;
 153: {
 154:     char tmpbuf[LBUFLEN];
 155: 
 156:     if (parsed_art == artnum)
 157:     return 0;
 158:     /* no maybe about it now */
 159:     if (artopen(artnum) == Nullfp) {
 160:     return -1;
 161:     }
 162:     start_header(artnum);
 163:     while (in_header) {
 164:     artpos = ftell(artfp);
 165:     if (fgets(tmpbuf,LBUFLEN,artfp) == Nullch)
 166:         break;
 167:     parseline(tmpbuf,FALSE,FALSE);
 168:     }
 169:     in_header = PAST_HEADER;
 170:     return 0;
 171: }
 172: #endif
 173: 
 174: /* get the subject line for an article */
 175: 
 176: char *
 177: fetchsubj(artnum,current_subject,copy)
 178: ART_NUM artnum;             /* article to get subject from */
 179: bool current_subject;           /* is it in a parsed header? */
 180: bool copy;              /* do you want it savestr()ed? */
 181: {
 182:     char *s = Nullch, *t;
 183: 
 184: #ifdef CACHESUBJ
 185:     if (!subj_list) {
 186:     register ART_NUM i;
 187: 
 188: 
 189: #ifndef lint
 190:     subj_list =
 191:       (char**)safemalloc((MEM_SIZE)((OFFSET(lastart)+2)*sizeof(char *)));
 192: #endif lint
 193:     for (i=0; i<=OFFSET(lastart); i++)
 194:         subj_list[i] = Nullch;
 195:     }
 196:     if (!artnum || artnum > lastart)
 197:     s = nullstr;
 198:     else
 199:     s = subj_list[OFFSET(artnum)];
 200: #endif
 201:     if (s == Nullch) {
 202:     if (current_subject) {
 203:         s = fetchlines(artnum,SUBJ_LINE);
 204: #ifdef CACHESUBJ
 205:         subj_list[OFFSET(artnum)] = s;
 206: #endif
 207:     }
 208:     else {
 209:         s = safemalloc((MEM_SIZE)256);
 210:         *s = '\0';
 211:         if (artopen(artnum) != Nullfp) {
 212:         do {
 213:             if (fgets(s,256,artfp) == Nullch)
 214:             strcpy(s, "Title: \n");
 215:         } while (strnNE(s,"Title:",6) && strnNE(s,"Subject:",8));
 216:         s[strlen(s)-1] = '\0';
 217:         t = index(s,':')+1;
 218:         while (*t == ' ') t++;
 219:         strcpy(s, t);
 220:         }
 221:         s = saferealloc(s, (MEM_SIZE)strlen(s)+1);
 222: #ifdef CACHESUBJ
 223:         subj_list[OFFSET(artnum)] = s;
 224: #endif
 225:     }
 226:     }
 227: #ifdef CACHESUBJ
 228:     if (copy) {
 229:     t = savestr(s);
 230:     return t;
 231:     }
 232:     else
 233:     return s;
 234: #else
 235:     if (copy)
 236:     return s;
 237:     else {
 238:     safecpy(cmd_buf,s,CBUFLEN); /* hope this is okay--we're */
 239:     free(s);
 240:     return cmd_buf;         /* really scraping for space here */
 241:     }
 242: #endif
 243: }
 244: 
 245: /* get header lines from an article */
 246: 
 247: char *
 248: fetchlines(artnum,which_line)
 249: ART_NUM artnum;             /* article to get line from */
 250: int which_line;             /* type of line desired */
 251: {
 252:     char *newbuf, *t, tmp_buf[LBUFLEN];
 253:     register ART_POS curpos;
 254:     int size;
 255:     register ART_POS firstpos;
 256:     register ART_POS lastpos;
 257: 
 258: #ifdef ASYNC_PARSE
 259:     if (parse_maybe(artnum))
 260:     artnum = 0;
 261: #endif
 262:     firstpos = htype[which_line].ht_minpos;
 263:     lastpos = htype[which_line].ht_maxpos;
 264:     if (!artnum || firstpos < 0 || artopen(artnum) == Nullfp) {
 265:     newbuf = safemalloc((unsigned int)1);
 266:     *newbuf = '\0';
 267:     return newbuf;
 268:     }
 269: #ifndef lint
 270:     size = lastpos - firstpos + 1;
 271: #else
 272:     size = Null(int);
 273: #endif lint
 274: #ifdef DEBUGGING
 275:     if (debug && (size < 1 || size > 1000)) {
 276:     printf("Firstpos = %ld, lastpos = %ld\n",(long)firstpos,(long)lastpos);
 277:     gets(tmp_buf);
 278:     }
 279: #endif
 280:     newbuf = safemalloc((unsigned int)size);
 281:     *newbuf = '\0';
 282:     fseek(artfp,firstpos,0);
 283:     for (curpos = firstpos; curpos < lastpos; curpos = ftell(artfp)) {
 284:     if (fgets(tmp_buf,LBUFLEN,artfp) == Nullch)
 285:         break;
 286:     if (*tmp_buf == ' ' || *tmp_buf == '\t')
 287:         t = tmp_buf;
 288:     else
 289:         t = index(tmp_buf,':')+1;
 290:     if (t == Nullch)
 291:         break;
 292:     else {
 293:         while (*t == ' ' || *t == '\t') t++;
 294:         safecat(newbuf,t,size);
 295:     }
 296:     }
 297:     return newbuf;
 298: }

Defined functions

Defined variables