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#include "sysutil.h"
#include <string.h>
int env_argc = 0;
char **env_argv = NULL;
static const char *find_key(const char *params, const char *key);
/*===========================================================================*
* env_setargs *
*===========================================================================*/
void env_setargs(int arg_c, char *arg_v[])
{
env_argc= arg_c;
env_argv= arg_v;
}
/*===========================================================================*
* env_get_param *
*===========================================================================*/
int env_get_param(const char *key, char *value, int max_len)
{
message m;
static char mon_params[MULTIBOOT_PARAM_BUF_SIZE]; /* copy parameters here */
const char *key_value;
int i, s;
size_t keylen;
if (key == NULL)
return EINVAL;
keylen= strlen(key);
for (i= 1; i<env_argc; i++)
{
if (strncmp(env_argv[i], key, keylen) != 0)
continue;
if (strlen(env_argv[i]) <= keylen)
continue;
if (env_argv[i][keylen] != '=')
continue;
key_value= env_argv[i]+keylen+1;
if (strlen(key_value)+1 > (size_t) max_len)
return(E2BIG);
strcpy(value, key_value);
return OK;
}
/* Get copy of boot monitor parameters. */
m.m_type = SYS_GETINFO;
m.m_lsys_krn_sys_getinfo.request = GET_MONPARAMS;
m.m_lsys_krn_sys_getinfo.endpt = SELF;
m.m_lsys_krn_sys_getinfo.val_len = sizeof(mon_params);
m.m_lsys_krn_sys_getinfo.val_ptr = (vir_bytes)mon_params;
if ((s=_kernel_call(SYS_GETINFO, &m)) != OK) {
printf("SYS_GETINFO: %d (size %zu)\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, see if it fits in the client's buffer. Callers assume that
* their buffer is unchanged on error, so don't make a partial copy.
*/
if ((strlen(key_value)+1) > (size_t) max_len) return(E2BIG);
/* Make the actual copy. */
strcpy(value, key_value);
return(OK);
}
/*==========================================================================*
* find_key *
*==========================================================================*/
static const char *find_key(const char *params, const char *name)
{
const char *namep, *envp;
for (envp = params; *envp != 0;) {
for (namep = name; *namep != 0 && *namep == *envp; namep++, envp++)
;
if (*namep == '\0' && *envp == '=')
return(envp + 1);
while (*envp++ != 0)
;
}
return(NULL);
}
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