ref: 11954a19a6252415c4eae086cc6b09bfbbc1aa9f
dir: /sys/src/ape/lib/ap/plan9/9iounit.c/
#include "lib.h" #include <string.h> #include <stdlib.h> #include <fmt.h> #include "sys9.h" #include "dir.h" /* * Format: 3 r M 4 (0000000000457def 11 00) 8192 512 /rc/lib/rcmain */ static int getfields(char *str, char **args, int max, int mflag) { char r; int intok, narg; if(max <= 0) return 0; narg = 0; args[narg] = str; if(!mflag) narg++; intok = 0; for(;; str++) { r = *str; if(r == 0) break; if(r == ' ' || r == '\t'){ if(narg >= max) break; *str = 0; intok = 0; args[narg] = str + 1; if(!mflag) narg++; } else { if(!intok && mflag) narg++; intok = 1; } } return narg; } int _IOUNIT(int fd) { int i, cfd; char buf[128], *args[10]; snprint(buf, sizeof buf, "#d/%dctl", fd); cfd = _OPEN(buf, OREAD); if(cfd < 0) return 0; i = _READ(cfd, buf, sizeof buf-1); _CLOSE(cfd); if(i <= 0) return 0; buf[i] = '\0'; if(getfields(buf, args, 10, 1) != 10) return 0; return atoi(args[7]); }