diplodocus.org Git - nmh/blob - docs/historical/mh-jun-1982/Extras/libh/execsh.c

   1 #ifdef COMMENT
   2         Proprietary Rand Corporation, 1981.
   3         Further distribution of this software
   4         subject to the terms of the Rand
   5         license agreement.
   6 #endif
   7
   8 #
   9 #include "../h/errors.h"
  10 #define NSHARGS 25      /* limit on number of args to shell command file  */
  11 execvsh(name,args)
  12 char *name, **args;
  13 {
  14         extern errno;
  15         register char **v1, **v2;
  16         char *shvec[NSHARGS];
  17
  18         v2 = args;
  19         for (v1 = v2; *v1; )
  20                 if (*v1++ == -1) *--v1 = 0;
  21         execv(name, v2);
  22         /* return 0 if not found, -1 if not executable */
  23         if (errno == ENOENT || errno == EACCES)
  24                 return (0);
  25         else if (errno != ENOEXEC)
  26                 return(-1);
  27         v1 = shvec;
  28         *v1++ = "sh";
  29         *v1++ = name;
  30         *v2++ = "/bin/sh";
  31         while (*v1++ = *v2++) {
  32                 if (v1 >= &shvec[NSHARGS]) {
  33                         errno = E2BIG;
  34                         return(-1);
  35                 }
  36         }
  37         execv(args[0], shvec);
  38         return(-1);
  39 }
  40
  41 execlsh(name,arg0,arg1,arg2)
  42 char *name, *arg0, *arg1, *arg2;
  43 {
  44         return(execvsh(name,&arg0));
  45 }