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Annotation of researchv10no/cmd/ops/gettty.c, revision 1.1.1.1

1.1       root        1: #include "ps.h"
                      2: 
                      3: char *
                      4: lookdir(node)
                      5: register node;
                      6: {
                      7:        register Dirnode *np;
                      8:        register struct direct *dp;
                      9:        if (node)
                     10:                for (np = devlist; np; np = np->next)
                     11:                        for (dp = np->begin; dp < np->end; dp++)
                     12:                                if (dp->d_ino == node)
                     13:                                        return dp->d_name;
                     14:        return 0;
                     15: }
                     16: 
                     17: char *
                     18: gettty(dev, node)
                     19: {
                     20:        register char *nm;
                     21:        if (dev == 0xffff) {
                     22:                static char buf[8];
                     23:                sprintf(buf, "p%4.4x", node&0xffff);
                     24:                return buf;
                     25:        }
                     26:        nm = lookdir(node);
                     27:        if (nm == 0)
                     28:                return "?";
                     29:        if (nm[0] == 't' && nm[1] == 't' && nm[2] == 'y')
                     30:                nm += 3;
                     31:        return nm;
                     32: }
                     33: 
                     34: Dirnode *
                     35: getdir(dirname, list)
                     36: char *dirname; Dirnode *list;
                     37: {
                     38:        struct stat sbuf;
                     39:        register fd, n;
                     40:        register Dirnode *np; register struct direct *dp;
                     41: 
                     42:        if ((fd = open(dirname, 0)) < 0)
                     43:                return 0;
                     44:        if (fstat(fd, &sbuf) < 0 || (np = Malloc(Dirnode, 1)) == 0) {
                     45:                close(fd); return 0;
                     46:        }
                     47:        n = sbuf.st_size/sizeof(struct direct);
                     48:        if ((dp = Malloc(struct direct, n)) == 0) {
                     49:                free(np); close(fd); return 0;
                     50:        }
                     51:        if (!Read(fd, dp, sbuf.st_size)) {
                     52:                free(np); free(dp); close(fd); return 0;
                     53:        }
                     54:        np->next = list;
                     55:        np->begin = dp;
                     56:        np->end = dp + n;
                     57:        close(fd);
                     58:        return np;
                     59: }

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