parse.c

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    1 #include        "u.h"
    2 #include        "../port/lib.h"
    3 #include        "mem.h"
    4 #include        "dat.h"
    5 #include        "fns.h"
    6 #include        "../port/error.h"
    7 
    8 /*
    9  * Generous estimate of number of fields, including terminal nil pointer
   10  */
   11 static int
   12 ncmdfield(char *p, int n)
   13 {
   14         int white, nwhite;
   15         char *ep;
   16         int nf;
   17 
   18         if(p == nil)
   19                 return 1;
   20 
   21         nf = 0;
   22         ep = p+n;
   23         white = 1;      /* first text will start field */
   24         while(p < ep){
   25                 nwhite = (strchr(" \t\r\n", *p++ & 0xFF) != 0); /* UTF is irrelevant */
   26                 if(white && !nwhite)    /* beginning of field */
   27                         nf++;
   28                 white = nwhite;
   29         }
   30         return nf+1;    /* +1 for nil */
   31 }
   32 
   33 /*
   34  *  parse a command written to a device
   35  */
   36 Cmdbuf*
   37 parsecmd(char *p, int n)
   38 {
   39         Cmdbuf *volatile cb;
   40         int nf;
   41         char *sp;
   42 
   43         nf = ncmdfield(p, n);
   44 
   45         /* allocate Cmdbuf plus string pointers plus copy of string including \0 */
   46         sp = smalloc(sizeof(*cb) + nf * sizeof(char*) + n + 1);
   47         cb = (Cmdbuf*)sp;
   48         cb->f = (char**)(&cb[1]);
   49         cb->buf = (char*)(&cb->f[nf]);
   50 
   51         if(up!=nil && waserror()){
   52                 free(cb);
   53                 nexterror();
   54         }
   55         memmove(cb->buf, p, n);
   56         if(up != nil)
   57                 poperror();
   58 
   59         /* dump new line and null terminate */
   60         if(n > 0 && cb->buf[n-1] == '\n')
   61                 n--;
   62         cb->buf[n] = '\0';
   63 
   64         cb->nf = tokenize(cb->buf, cb->f, nf-1);
   65         cb->f[cb->nf] = nil;
   66 
   67         return cb;
   68 }
   69 
   70 /*
   71  * Reconstruct original message, for error diagnostic
   72  */
   73 void
   74 cmderror(Cmdbuf *cb, char *s)
   75 {
   76         int i;
   77         char *p, *e;
   78 
   79         p = up->genbuf;
   80         e = p+ERRMAX-10;
   81         p = seprint(p, e, "%s \"", s);
   82         for(i=0; i<cb->nf; i++){
   83                 if(i > 0)
   84                         p = seprint(p, e, " ");
   85                 p = seprint(p, e, "%q", cb->f[i]);
   86         }
   87         strcpy(p, "\"");
   88         error(up->genbuf);
   89 }
   90 
   91 /*
   92  * Look up entry in table
   93  */
   94 Cmdtab*
   95 lookupcmd(Cmdbuf *cb, Cmdtab *ctab, int nctab)
   96 {
   97         int i;
   98         Cmdtab *ct;
   99 
  100         if(cb->nf == 0)
  101                 error("empty control message");
  102 
  103         for(ct = ctab, i=0; i<nctab; i++, ct++){
  104                 if(strcmp(ct->cmd, "*") !=0)    /* wildcard always matches */
  105                 if(strcmp(ct->cmd, cb->f[0]) != 0)
  106                         continue;
  107                 if(ct->narg != 0 && ct->narg != cb->nf)
  108                         cmderror(cb, Ecmdargs);
  109                 return ct;
  110         }
  111 
  112         cmderror(cb, "unknown control message");
  113         return nil;
  114 }

Cache object: 0aad520fca1d42f8223b908f2ce05979

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FreeBSD/Linux Kernel Cross Reference sys/port/parse.c

FreeBSD/Linux Kernel Cross Reference
sys/port/parse.c