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Annotation of researchv10no/cmd/btree/diskwrt.c, revision 1.1.1.1

1.1       root        1: #include "cbt.h"
                      2: 
                      3: extern bfile *curbf;
                      4: extern long lseek();
                      5: 
                      6: ndwrt(b, where) hdr *b; ndaddr where;
                      7: {
                      8:        register n;
                      9:        if(lseek(curbf->tfd, where * (long)NDSZ, 0) == -1)
                     10:                return(EOF);
                     11:        if((n = write(curbf->tfd, (char *)b, NDSZ)) != NDSZ) { /*unacceptable*/
                     12:                if(n >= 0)
                     13:                        errno = BIOWRT;
                     14:                curbf->fatal++;
                     15:                return(EOF);
                     16:        }
                     17:        return(0);
                     18: }
                     19: 
                     20: long brecwrite(rec) mbuf rec;
                     21: {      long loc;
                     22:        int n;
                     23:        errno = 0;
                     24:        loc = lseek(curbf->dfd, 0L, 2);
                     25:        if((n = write(curbf->dfd, rec.mdata, rec.mlen)) == rec.mlen)
                     26:                return(loc);
                     27:        else if(n == -1 || errno)
                     28:                return(EOF);
                     29:        errno = BIOWRT;
                     30:        return(EOF);
                     31: }
                     32: 
                     33: ndaddr newnode(b) hdr *b;
                     34: {      long loc;
                     35:        int n;
                     36:        b->hstamp = tranid;
                     37:        loc = lseek(curbf->tfd, 0L, 2);
                     38:        if(loc == -1)
                     39:                return(EOF);
                     40:        if((n = write(curbf->tfd, (char *)b, NDSZ)) != NDSZ)
                     41:                if(n < 0)
                     42:                        return(EOF);
                     43:                else {
                     44:                        errno = BIOWRT;
                     45:                        return(EOF);
                     46:                }
                     47:        return(loc/NDSZ);
                     48: }
                     49: 
                     50: ndaddr oldnode(lev)
                     51: {      int n;
                     52:        ndaddr a;
                     53:        if(curbf->path[lev]->hstamp != tranid) {
                     54:                a = newnode(curbf->path[lev]);
                     55:                if(a == EOF)
                     56:                        curbf->fatal++;
                     57:                curbf->loc[lev] = a;
                     58:                return(a);
                     59:        }
                     60:        if(lseek(curbf->tfd, (long)curbf->loc[lev]*NDSZ, 0) == EOF)
                     61:                return(EOF);
                     62:        if((n = write(curbf->tfd, (char *)curbf->path[lev], NDSZ)) != NDSZ) {
                     63:                if(n >= 0)
                     64:                        errno = BIOWRT;
                     65:                return(EOF);
                     66:        }
                     67:        mustwrite(curbf, lev) = 0;
                     68:        return(curbf->loc[lev]);
                     69: }
                     70: static struct D { struct D *a; char *b;} VER = {&VER,"\n81/8/9:diskwrt.c\n"};
                     71: /*0100101010000110*/

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