| rsc | b2cfc4e | 2003-09-30 17:47:41 +0000 | [diff] [blame] | 1 | #include "lib9.h" |
| 2 | #include <bio.h> |
| 3 | |
| 4 | enum |
| 5 | { |
| 6 | MAXBUFS = 20 |
| 7 | }; |
| 8 | |
| 9 | static Biobuf* wbufs[MAXBUFS]; |
| 10 | static int atexitflag; |
| 11 | |
| 12 | static |
| 13 | void |
| 14 | batexit(void) |
| 15 | { |
| 16 | Biobuf *bp; |
| 17 | int i; |
| 18 | |
| 19 | for(i=0; i<MAXBUFS; i++) { |
| 20 | bp = wbufs[i]; |
| 21 | if(bp != 0) { |
| 22 | wbufs[i] = 0; |
| 23 | Bflush(bp); |
| 24 | } |
| 25 | } |
| 26 | } |
| 27 | |
| 28 | static |
| 29 | void |
| 30 | deinstall(Biobuf *bp) |
| 31 | { |
| 32 | int i; |
| 33 | |
| 34 | for(i=0; i<MAXBUFS; i++) |
| 35 | if(wbufs[i] == bp) |
| 36 | wbufs[i] = 0; |
| 37 | } |
| 38 | |
| 39 | static |
| 40 | void |
| 41 | install(Biobuf *bp) |
| 42 | { |
| 43 | int i; |
| 44 | |
| 45 | deinstall(bp); |
| 46 | for(i=0; i<MAXBUFS; i++) |
| 47 | if(wbufs[i] == 0) { |
| 48 | wbufs[i] = bp; |
| 49 | break; |
| 50 | } |
| 51 | if(atexitflag == 0) { |
| 52 | atexitflag = 1; |
| 53 | atexit(batexit); |
| 54 | } |
| 55 | } |
| 56 | |
| 57 | int |
| 58 | Binits(Biobuf *bp, int f, int mode, unsigned char *p, int size) |
| 59 | { |
| 60 | |
| 61 | p += Bungetsize; /* make room for Bungets */ |
| 62 | size -= Bungetsize; |
| 63 | |
| 64 | switch(mode) { |
| 65 | default: |
| 66 | fprint(2, "Bopen: unknown mode %d\n", mode); |
| 67 | return Beof; |
| 68 | |
| 69 | case OREAD: |
| 70 | bp->state = Bractive; |
| 71 | bp->ocount = 0; |
| 72 | break; |
| 73 | |
| 74 | case OWRITE: |
| 75 | install(bp); |
| 76 | bp->state = Bwactive; |
| 77 | bp->ocount = -size; |
| 78 | break; |
| 79 | } |
| 80 | bp->bbuf = p; |
| 81 | bp->ebuf = p+size; |
| 82 | bp->bsize = size; |
| 83 | bp->icount = 0; |
| 84 | bp->gbuf = bp->ebuf; |
| 85 | bp->fid = f; |
| 86 | bp->flag = 0; |
| 87 | bp->rdline = 0; |
| 88 | bp->offset = 0; |
| 89 | /* bp->runesize = 0; */ |
| 90 | return 0; |
| 91 | } |
| 92 | |
| 93 | |
| 94 | int |
| 95 | Binit(Biobuf *bp, int f, int mode) |
| 96 | { |
| 97 | return Binits(bp, f, mode, bp->b, sizeof(bp->b)); |
| 98 | } |
| 99 | |
| 100 | Biobuf* |
| 101 | Bopen(char *name, int mode) |
| 102 | { |
| 103 | Biobuf *bp; |
| 104 | int f; |
| 105 | |
| 106 | switch(mode) { |
| 107 | default: |
| 108 | fprint(2, "Bopen: unknown mode %d\n", mode); |
| 109 | return 0; |
| 110 | |
| 111 | case OREAD: |
| 112 | f = open(name, OREAD); |
| 113 | if(f < 0) |
| 114 | return 0; |
| 115 | break; |
| 116 | |
| 117 | case OWRITE: |
| 118 | f = creat(name, 0666); |
| 119 | if(f < 0) |
| 120 | return 0; |
| 121 | } |
| 122 | bp = malloc(sizeof(Biobuf)); |
| 123 | if(bp == 0) |
| 124 | return 0; |
| 125 | Binits(bp, f, mode, bp->b, sizeof(bp->b)); |
| 126 | bp->flag = Bmagic; |
| 127 | return bp; |
| 128 | } |
| 129 | |
| 130 | int |
| 131 | Bterm(Biobuf *bp) |
| 132 | { |
| 133 | |
| 134 | deinstall(bp); |
| 135 | Bflush(bp); |
| 136 | if(bp->flag == Bmagic) { |
| 137 | bp->flag = 0; |
| 138 | close(bp->fid); |
| 139 | free(bp); |
| 140 | } |
| 141 | return 0; |
| 142 | } |
