minix/lib/utils/env_prefix.c

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2005-04-21 16:53:53 +02:00
#include "utils.h"
#include <stdlib.h>
#include <string.h>
/*=========================================================================*
* env_prefix *
*=========================================================================*/
PUBLIC int env_prefix(env, prefix)
char *env; /* environment variable to inspect */
char *prefix; /* prefix to test for */
{
/* An environment setting may be prefixed by a word, usually "pci".
* Return TRUE if a given prefix is used.
*/
char value[EP_BUF_SIZE];
char punct[] = ":,;.";
int s;
size_t n;
if ((s = sys_getkenv(env, strlen(env), value, sizeof(value))) != 0) {
if (s != ESRCH) /* only error allowed */
printf("WARNING: sys_getkenv() failed in env_prefix(): %d\n", s);
}
n = strlen(prefix);
return(value != NULL
&& strncmp(value, prefix, n) == 0
&& strchr(punct, value[n]) != NULL);
}