lib/libsys/env_prefix.c

   1 #include "sysutil.h"
   2 #include <stdlib.h>
   3 #include <string.h>
   4
   5 /*=========================================================================*
   6  *                              env_prefix                                 *
   7  *=========================================================================*/
   8 int env_prefix(env, prefix)
   9 char *env;              /* environment variable to inspect */
  10 char *prefix;           /* prefix to test for */
  11 {
  12 /* An environment setting may be prefixed by a word, usually "pci".
  13  * Return TRUE if a given prefix is used.
  14  */
  15   char value[EP_BUF_SIZE];
  16   char punct[] = ":,;.";
  17   int s;
  18   size_t n;
  19
  20   if ((s = env_get_param(env, value, sizeof(value))) != 0) {
  21         if (s != ESRCH)         /* only error allowed */
  22         printf("WARNING: env_get_param() failed in env_prefix(): %d\n", s);
  23         return FALSE;
  24   }
  25   n = strlen(prefix);
  26   return(strncmp(value, prefix, n) == 0
  27         && strchr(punct, value[n]) != NULL);
  28 }
  29