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1.1 root 1: #include "cbt.h"
2: #include "pr.h"
3:
4: extern bfile *curbf;
5: bdelete(bf, key) bfile *bf; mbuf key;
6: { dkey *dold, *dnew;
7: hdr *b;
8: int svlen, dellen;
9: char *ffree;
10:
11: if(bf == NULL)
12: return(EOF);
13: if(notran(bf))
14: return(EOF);
15: if(!bf->rdwrt) {
16: errno = BNOWRITE;
17: return(EOF);
18: }
19: if(bseek(bf, key) != FOUND)
20: return(NOTFOUND);
21: b = bf->path[0];
22: dold = bf->rdptr.rptr;
23: if(bf->rdptr.rnum + 1 >= b->kcnt) {
24: nfree(b) += dold->dlen + (treeonly(bf)? 0: sizeof(lfaddr));
25: --b->kcnt;
26: mustwrite(bf, 0) = 1;
27: if(b->hlev == 0 && b->kcnt <= 0 || b->hlev > 0 && b->kcnt < 0) {
28: mustwrite(bf, 0) = 0;
29: ndelete(1, key);
30: }
31: if(b->kcnt < 0)
32: b->kcnt = 0;
33: (void) bseek(bf, key);
34: return(FOUND);
35: }
36:
37: if(treeonly(bf))
38: ffree = (char *)&nfree(b) - nfree(b);
39: else
40: ffree = (char *)lfadr(b, b->kcnt - 1) - nfree(b);
41: svlen = dold->dlen;
42: dnew = (dkey *)((char *)dold + dold->dlen);
43: if(dnew->dcom <= dold->dcom) {
44: mvgbt((char *)dold, (char *)dnew, ffree - (char *)dnew);
45: if(!treeonly(bf))
46: rmlfadr(b, bf->rdptr.rnum);
47: b->kcnt--;
48: mustwrite(bf, 0) = 1;
49: nfree(b) += svlen + (treeonly(bf)? 0: sizeof(lfaddr));
50: (void) bseek(bf, key);
51: return(FOUND);
52: }
53: dellen = dnew->dcom - dold->dcom;
54: /* writing over dold */
55: dold->dlen = dnew->dlen + dellen;
56: mvgbt(dold->dkey + dellen, dnew->dkey, ffree - dnew->dkey);
57: if(!treeonly(bf))
58: rmlfadr(b, bf->rdptr.rnum);
59: b->kcnt--;
60: mustwrite(bf, 0) = 1;
61: nfree(b) += svlen - dellen + (treeonly(bf)? 0: sizeof(lfaddr));
62: (void) bseek(bf, key);
63: return(FOUND);
64: }
65: rmlfadr(b, n) hdr *b; unsigned int n;
66: {
67: mvgbt((char *)lfadr(b, b->kcnt - 2), (char *)lfadr(b, b->kcnt - 1),
68: (int)sizeof(lfaddr) * (b->kcnt - 1 - n));
69: }
70: rmndadr(b, n) hdr *b; unsigned short n;
71: {
72: mvgbt((char *)ndadr(b, b->kcnt - 1), (char *)ndadr(b, b->kcnt),
73: (int)sizeof(ndaddr) * (b->kcnt - n));
74: }
75: ndelete(lev, key) mbuf key;
76: { hdr *b;
77: int svlen, dellen;
78: unsigned short n;
79: private x;
80: char *ffree;
81: dkey *dold, *dnew;
82: if(lev > curbf->height) {
83: b = curbf->path[curbf->height];
84: b->hlev = 0;
85: curbf->height = 0;
86: mustwrite(curbf, 0) = 1;
87: curbf->loc[0] = 0;
88: nfree(b) = NDSZ - sizeof(hdr) - sizeof(trailer);
89: b->kcnt = 0;
90: mvgbt((char *)curbf->path[0], (char *)b, NDSZ);
91: return;
92: }
93: b = curbf->path[lev];
94: n = xscan(b, key, &x);
95: if(x.match == EOF) {
96: if(b->kcnt <= 0) {
97: mustwrite(curbf, lev) = 0;
98: ndelete(lev+1, key);
99: return;
100: }
101: b->kcnt--;
102: nfree(b) += sizeof(ndaddr) + x.d->dlen;
103: mustwrite(curbf, lev) = 1;
104: return;
105: }
106: dold = x.d;
107: dnew = (dkey *)((char *)dold + dold->dlen);
108: ffree = (char *)ndadr(b, b->kcnt) - nfree(b);
109: svlen = dold->dlen;
110: if(n + 1 >= b->kcnt || dnew->dcom <= dold->dcom) {
111: mvgbt((char *)dold, (char *)dnew, ffree - (char *)dnew);
112: rmndadr(b, n);
113: b->kcnt--;
114: mustwrite(curbf, lev) = 1;
115: nfree(b) += sizeof(ndaddr) + svlen;
116: return;
117: }
118: dellen = dnew->dcom - dold->dcom;
119: /* writing over dold */
120: dold->dlen = dnew->dlen + dellen;
121: mvgbt(dold->dkey + dellen, dnew->dkey, ffree - dnew->dkey);
122: rmndadr(b, n);
123: b->kcnt--;
124: mustwrite(curbf, lev) = 1;
125: nfree(b) += sizeof(ndaddr) + svlen - dellen;
126: }
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