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