minix/lib/libsys/env_prefix.c

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#include "sysutil.h"
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#include <stdlib.h>
#include <string.h>
/*=========================================================================*
* env_prefix *
*=========================================================================*/
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int env_prefix(env, prefix)
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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[] = ":,;.";
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int s;
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size_t n;
if ((s = env_get_param(env, value, sizeof(value))) != 0) {
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if (s != ESRCH) /* only error allowed */
printf("WARNING: env_get_param() failed in env_prefix(): %d\n", s);
return FALSE;
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}
n = strlen(prefix);
return(strncmp(value, prefix, n) == 0
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&& strchr(punct, value[n]) != NULL);
}