minix/lib/sysutil/env_get_prm.c

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#include "sysutil.h"
#include <minix/config.h>
#include <string.h>
PRIVATE int argc = 0;
PRIVATE char **argv = NULL;
FORWARD _PROTOTYPE( char *find_key, (const char *params, const char *key));
/*===========================================================================*
* env_setargs *
*===========================================================================*/
PUBLIC void env_setargs(arg_c, arg_v)
int arg_c;
char *arg_v[];
{
argc= arg_c;
argv= arg_v;
}
/*===========================================================================*
* env_get_param *
*===========================================================================*/
PUBLIC int env_get_param(key, value, max_len)
char *key; /* which key to look up */
char *value; /* where to store value */
int max_len; /* maximum length of value */
{
message m;
static char mon_params[128*sizeof(char *)]; /* copy parameters here */
char *key_value;
int i, s, keylen;
if (key == NULL)
return EINVAL;
keylen= strlen(key);
for (i= 1; i<argc; i++)
{
if (strncmp(argv[i], key, keylen) != 0)
continue;
if (strlen(argv[i]) <= keylen)
continue;
if (argv[i][keylen] != '=')
continue;
key_value= argv[i]+keylen+1;
if (strlen(key_value)+1 > EP_BUF_SIZE)
return(E2BIG);
strcpy(value, key_value);
return OK;
}
/* Get copy of boot monitor parameters. */
m.m_type = SYS_GETINFO;
m.I_REQUEST = GET_MONPARAMS;
m.I_PROC_NR = SELF;
m.I_VAL_LEN = sizeof(mon_params);
m.I_VAL_PTR = mon_params;
if ((s=_taskcall(SYSTASK, SYS_GETINFO, &m)) != OK) {
printf("SYS_GETINFO: %d (size %u)\n", s, sizeof(mon_params));
return(s);
}
/* We got a copy, now search requested key. */
if ((key_value = find_key(mon_params, key)) == NULL)
return(ESRCH);
/* Value found, make the actual copy (as far as possible). */
strncpy(value, key_value, max_len);
/* See if it fits in the client's buffer. */
if ((strlen(key_value)+1) > max_len) return(E2BIG);
return(OK);
}
/*==========================================================================*
* find_key *
*==========================================================================*/
PRIVATE char *find_key(params,name)
const char *params;
const char *name;
{
register const char *namep;
register char *envp;
for (envp = (char *) params; *envp != 0;) {
for (namep = name; *namep != 0 && *namep == *envp; namep++, envp++)
;
if (*namep == '\0' && *envp == '=')
return(envp + 1);
while (*envp++ != 0)
;
}
return(NULL);
}