From 12b28343ee68f15bbf2946b4df35cd6384841c5f Mon Sep 17 00:00:00 2001 From: Bill Joy Date: Mon, 24 Dec 1979 02:14:00 -0800 Subject: [PATCH] BSD 3 development Work on file usr/src/sys/stand/sys.c Synthesized-from: 3bsd --- usr/src/sys/stand/sys.c | 474 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 474 insertions(+) create mode 100644 usr/src/sys/stand/sys.c diff --git a/usr/src/sys/stand/sys.c b/usr/src/sys/stand/sys.c new file mode 100644 index 0000000000..2ef70c81c5 --- /dev/null +++ b/usr/src/sys/stand/sys.c @@ -0,0 +1,474 @@ +#include +#include +#include +#include +#include +#include "saio.h" + +ino_t dlook(); + +static +openi(n,io) +register struct iob *io; +{ + register struct dinode *dp; + + io->i_offset = 0; + io->i_bn = fsbtodb(itod(n)) + io->i_boff; + io->i_cc = BSIZE; + io->i_ma = io->i_buf; + devread(io); + + dp = (struct dinode *)io->i_buf; + dp = &dp[itoo(n)]; + io->i_ino.i_number = n; + io->i_ino.i_mode = dp->di_mode; + io->i_ino.i_size = dp->di_size; + l3tol((char *)io->i_ino.i_un.i_addr, (char *)dp->di_addr, NADDR); +} + +static +find(path, file) +register char *path; +struct iob *file; +{ + register char *q; + char c; + int n; + + if (path==NULL || *path=='\0') { + printf("null path\n"); + return(0); + } + + openi((ino_t) ROOTINO, file); + while (*path) { + while (*path == '/') + path++; + q = path; + while(*q != '/' && *q != '\0') + q++; + c = *q; + *q = '\0'; + + if ((n=dlook(path, file))!=0) { + if (c=='\0') + break; + openi(n, file); + *q = c; + path = q; + continue; + } else { + printf("%s not found\n",path); + return(0); + } + } + return(n); +} + +static daddr_t +sbmap(io, bn) +register struct iob *io; +daddr_t bn; +{ + register i; + register struct inode *ip; + int j, sh; + daddr_t nb, *bap; + int ibn = bn; + + ip = &io->i_ino; + if(bn < 0) { + printf("bn negative\n"); + return((daddr_t)0); + } + + /* + * blocks 0..NADDR-4 are direct blocks + */ + if(bn < NADDR-3) { + i = bn; + nb = ip->i_un.i_addr[i]; + return(nb); + } + + /* + * addresses NADDR-3, NADDR-2, and NADDR-1 + * have single, double, triple indirect blocks. + * the first step is to determine + * how many levels of indirection. + */ + sh = 0; + nb = 1; + bn -= NADDR-3; + for(j=3; j>0; j--) { + sh += NSHIFT; + nb <<= NSHIFT; + if(bn < nb) + break; + bn -= nb; + } + if(j == 0) { + printf("bn ovf %D\n",bn); + return((daddr_t)0); + } + + /* + * fetch the address from the inode + */ + nb = ip->i_un.i_addr[NADDR-j]; + if(nb == 0) { + printf("bn void %D\n",bn); + return((daddr_t)0); + } + + /* + * fetch through the indirect blocks + */ + for(; j<=3; j++) { + if (blknos[j] != nb) { + io->i_bn = fsbtodb(nb) + io->i_boff; + io->i_ma = b[j]; + io->i_cc = BSIZE; + devread(io); + bap = (daddr_t *)b[j]; + blknos[j] = nb; + } + bap = (daddr_t *)b[j]; + sh -= NSHIFT; + i = (bn>>sh) & NMASK; + nb = bap[i]; + if(nb == 0) { + printf("bn void %D\n",bn); + return((daddr_t)0); + } + } + return(nb); +} + +static ino_t +dlook(s, io) +char *s; +register struct iob *io; +{ + register struct direct *dp; + register struct inode *ip; + daddr_t bn; + int n,dc; + + if (s==NULL || *s=='\0') + return(0); + ip = &io->i_ino; + if ((ip->i_mode&IFMT)!=IFDIR) { + printf("not a directory\n"); + return(0); + } + + n = ip->i_size/sizeof(struct direct); + + if (n==0) { + printf("zero length directory\n"); + return(0); + } + + dc = BSIZE; + bn = (daddr_t)0; + while(n--) { + if (++dc >= BSIZE/sizeof(struct direct)) { + io->i_bn = fsbtodb(sbmap(io, bn++)) + io->i_boff; + io->i_ma = io->i_buf; + io->i_cc = BSIZE; + devread(io); + dp = (struct direct *)io->i_buf; + dc = 0; + } + + if (match(s, dp->d_name)) + return(dp->d_ino); + dp++; + } + return(0); +} + +static +match(s1,s2) +register char *s1,*s2; +{ + register cc; + + cc = DIRSIZ; + while (cc--) { + if (*s1 != *s2) + return(0); + if (*s1++ && *s2++) + continue; else + return(1); + } + return(1); +} + +lseek(fdesc, addr, ptr) +int fdesc; +off_t addr; +int ptr; +{ + register struct iob *io; + + if (ptr != 0) { + printf("Seek not from beginning of file\n"); + return(-1); + } + fdesc -= 3; + if (fdesc < 0 || fdesc >= NFILES || ((io = &iob[fdesc])->i_flgs&F_ALLOC) == 0) + return(-1); + io->i_offset = addr; + io->i_bn = fsbtodb(addr/BSIZE) + io->i_boff; + io->i_cc = 0; + return(0); +} + +getc(fdesc) +int fdesc; +{ + register struct iob *io; + register char *p; + register c; + int off; + + + if (fdesc >= 0 && fdesc <= 2) + return(getchar()); + fdesc -= 3; + if (fdesc < 0 || fdesc >= NFILES || ((io = &iob[fdesc])->i_flgs&F_ALLOC) == 0) + return(-1); + p = io->i_ma; + if (io->i_cc <= 0) { + io->i_bn = fsbtodb(io->i_offset/(off_t)BSIZE); + if (io->i_flgs&F_FILE) + io->i_bn = fsbtodb(sbmap(io, dbtofsb(io->i_bn))) + io->i_boff; + io->i_ma = io->i_buf; + io->i_cc = BSIZE; + devread(io); + if (io->i_flgs&F_FILE) { + off = io->i_offset % (off_t)BSIZE; + if (io->i_offset+(BSIZE-off) >= io->i_ino.i_size) + io->i_cc = io->i_ino.i_size - io->i_offset + off; + io->i_cc -= off; + if (io->i_cc <= 0) + return(-1); + } else + off = 0; + p = &io->i_buf[off]; + } + io->i_cc--; + io->i_offset++; + c = (unsigned)*p++; + io->i_ma = p; + return(c); +} +/* does this port? +getw(fdesc) +int fdesc; +{ + register w,i; + register char *cp; + int val; + + for (i = 0, val = 0, cp = &val; i < sizeof(val); i++) { + w = getc(fdesc); + if (w < 0) { + if (i == 0) + return(-1); + else + return(val); + } + *cp++ = w; + } + return(val); +} +*/ + +read(fdesc, buf, count) +int fdesc; +char *buf; +int count; +{ + register i; + register struct iob *file; + + if (fdesc >= 0 & fdesc <= 2) { + i = count; + do { + *buf = getchar(); + } while (--i && *buf++ != '\n'); + return(count - i); + } + fdesc -= 3; + if (fdesc < 0 || fdesc >= NFILES || ((file = &iob[fdesc])->i_flgs&F_ALLOC) == 0) + return(-1); + if ((file->i_flgs&F_READ) == 0) + return(-1); + if ((file->i_flgs&F_FILE) == 0) { + file->i_cc = count; + file->i_ma = buf; + i = devread(file); + file->i_bn += CLSIZE; + return(i); + } + else { + if (file->i_offset+count > file->i_ino.i_size) + count = file->i_ino.i_size - file->i_offset; + if ((i = count) <= 0) + return(0); + do { + *buf++ = getc(fdesc+3); + } while (--i); + return(count); + } +} + +write(fdesc, buf, count) +int fdesc; +char *buf; +int count; +{ + register i; + register struct iob *file; + + if (fdesc >= 0 && fdesc <= 2) { + i = count; + while (i--) + putchar(*buf++); + return(count); + } + fdesc -= 3; + if (fdesc < 0 || fdesc >= NFILES || ((file = &iob[fdesc])->i_flgs&F_ALLOC) == 0) + return(-1); + if ((file->i_flgs&F_WRITE) == 0) + return(-1); + file->i_cc = count; + file->i_ma = buf; + i = devwrite(file); + file->i_bn += CLSIZE; + return(i); +} + +open(str, how) +char *str; +int how; +{ + register char *cp; + int i; + register struct iob *file; + register struct devsw *dp; + int fdesc; + static first = 1; + long atol(); + + if (first) { + for (i = 0; i < NFILES; i++) + iob[i].i_flgs = 0; + first = 0; + } + + for (fdesc = 0; fdesc < NFILES; fdesc++) + if (iob[fdesc].i_flgs == 0) + goto gotfile; + _stop("No more file slots"); +gotfile: + (file = &iob[fdesc])->i_flgs |= F_ALLOC; + + for (cp = str; *cp && *cp != '('; cp++) + ; + if (*cp != '(') { + printf("Bad device\n"); + file->i_flgs = 0; + return(-1); + } + *cp++ = '\0'; + for (dp = devsw; dp->dv_name; dp++) { + if (match(str, dp->dv_name)) + goto gotdev; + } + printf("Unknown device\n"); + file->i_flgs = 0; + return(-1); +gotdev: + *(cp-1) = '('; + file->i_ino.i_dev = dp-devsw; + file->i_unit = *cp++ - '0'; + if (file->i_unit < 0 || file->i_unit > 7) { + printf("Bad unit specifier\n"); + file->i_flgs = 0; + return(-1); + } + if (*cp++ != ',') { +badoff: + printf("Missing offset specification\n"); + file->i_flgs = 0; + return(-1); + } + file->i_boff = atol(cp); + for (;;) { + if (*cp == ')') + break; + if (*cp++) + continue; + goto badoff; + } + devopen(file); + if (*++cp == '\0') { + file->i_flgs |= how+1; + file->i_cc = 0; + file->i_offset = 0; + return(fdesc+3); + } + if ((i = find(cp, file)) == 0) { + file->i_flgs = 0; + return(-1); + } + if (how != 0) { + printf("Can't write files yet.. Sorry\n"); + file->i_flgs = 0; + return(-1); + } + openi(i, file); + file->i_offset = 0; + file->i_cc = 0; + file->i_flgs |= F_FILE | (how+1); + return(fdesc+3); +} + +close(fdesc) +int fdesc; +{ + struct iob *file; + + fdesc -= 3; + if (fdesc < 0 || fdesc >= NFILES || ((file = &iob[fdesc])->i_flgs&F_ALLOC) == 0) + return(-1); + if ((file->i_flgs&F_FILE) == 0) + devclose(file); + file->i_flgs = 0; + return(0); +} + +exit() +{ + _stop("Exit called"); +} + +_stop(s) +char *s; +{ + printf("%s\n", s); + _rtt(); +} + +trap(ps) +int ps; +{ + printf("Trap %o\n", ps); + for (;;) + ; +} -- 2.20.1