1 #include "sysutil.h" 2 #include <string.h> 3 4 int env_argc = 0; 5 char **env_argv = NULL; 6 7 static const char *find_key(const char *params, const char *key); 8 9 /*===========================================================================* 10 * env_setargs * 11 *===========================================================================*/ 12 void env_setargs(int arg_c, char *arg_v[]) 13 { 14 env_argc= arg_c; 15 env_argv= arg_v; 16 } 17 18 /*===========================================================================* 19 * env_get_param * 20 *===========================================================================*/ 21 int env_get_param(const char *key, char *value, int max_len) 22 { 23 message m; 24 static char mon_params[MULTIBOOT_PARAM_BUF_SIZE]; /* copy parameters here */ 25 const char *key_value; 26 int i, s; 27 size_t keylen; 28 29 if (key == NULL) 30 return EINVAL; 31 32 keylen= strlen(key); 33 for (i= 1; i<env_argc; i++) 34 { 35 if (strncmp(env_argv[i], key, keylen) != 0) 36 continue; 37 if (strlen(env_argv[i]) <= keylen) 38 continue; 39 if (env_argv[i][keylen] != '=') 40 continue; 41 key_value= env_argv[i]+keylen+1; 42 if (strlen(key_value)+1 > (size_t) max_len) 43 return(E2BIG); 44 strcpy(value, key_value); 45 return OK; 46 } 47 48 /* Get copy of boot monitor parameters. */ 49 m.m_type = SYS_GETINFO; 50 m.m_lsys_krn_sys_getinfo.request = GET_MONPARAMS; 51 m.m_lsys_krn_sys_getinfo.endpt = SELF; 52 m.m_lsys_krn_sys_getinfo.val_len = sizeof(mon_params); 53 m.m_lsys_krn_sys_getinfo.val_ptr = (vir_bytes)mon_params; 54 if ((s=_kernel_call(SYS_GETINFO, &m)) != OK) { 55 printf("SYS_GETINFO: %d (size %zu)\n", s, sizeof(mon_params)); 56 return(s); 57 } 58 59 /* We got a copy, now search requested key. */ 60 if ((key_value = find_key(mon_params, key)) == NULL) 61 return(ESRCH); 62 63 /* Value found, see if it fits in the client's buffer. Callers assume that 64 * their buffer is unchanged on error, so don't make a partial copy. 65 */ 66 if ((strlen(key_value)+1) > (size_t) max_len) return(E2BIG); 67 68 /* Make the actual copy. */ 69 strcpy(value, key_value); 70 71 return(OK); 72 } 73 74 75 /*==========================================================================* 76 * find_key * 77 *==========================================================================*/ 78 static const char *find_key(const char *params, const char *name) 79 { 80 const char *namep, *envp; 81 82 for (envp = params; *envp != 0;) { 83 for (namep = name; *namep != 0 && *namep == *envp; namep++, envp++) 84 ; 85 if (*namep == '\0' && *envp == '=') 86 return(envp + 1); 87 while (*envp++ != 0) 88 ; 89 } 90 return(NULL); 91 } 92 93