f2a85e58d9
* Removed some variants of the SYS_GETINFO calls from the kernel; replaced them with new PM and utils libary functionality. Fixed bugs in utils library that used old get_kenv() variant. * Implemented a buffer in the kernel to gather random data. Memory driver periodically checks this for /dev/random. A better random algorithm can now be implemented in the driver. Removed SYS_RANDOM; the SYS_GETINFO call is used instead. * Remove SYS_KMALLOC from the kernel. Memory allocation can now be done at the process manager with new 'other' library functions.
89 lines
2.7 KiB
C
89 lines
2.7 KiB
C
#include "utils.h"
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
|
|
/*=========================================================================*
|
|
* env_parse *
|
|
*=========================================================================*/
|
|
PUBLIC int env_parse(env, fmt, field, param, min, max)
|
|
char *env; /* environment variable to inspect */
|
|
char *fmt; /* template to parse it with */
|
|
int field; /* field number of value to return */
|
|
long *param; /* address of parameter to get */
|
|
long min, max; /* minimum and maximum values for the parameter */
|
|
{
|
|
/* Parse an environment variable setting, something like "DPETH0=300:3".
|
|
* Panic if the parsing fails. Return EP_UNSET if the environment variable
|
|
* is not set, EP_OFF if it is set to "off", EP_ON if set to "on" or a
|
|
* field is left blank, or EP_SET if a field is given (return value through
|
|
* *param). Punctuation may be used in the environment and format string,
|
|
* fields in the environment string may be empty, and punctuation may be
|
|
* missing to skip fields. The format string contains characters 'd', 'o',
|
|
* 'x' and 'c' to indicate that 10, 8, 16, or 0 is used as the last argument
|
|
* to strtol(). A '*' means that a field should be skipped. If the format
|
|
* string contains something like "\4" then the string is repeated 4 characters
|
|
* to the left.
|
|
*/
|
|
char *val, *end;
|
|
char value[EP_BUF_SIZE];
|
|
char PUNCT[] = ":,;.";
|
|
long newpar;
|
|
int s, i = 0, radix, r;
|
|
|
|
if ((s=get_mon_param(env, value, sizeof(value))) != 0) {
|
|
if (s == ESRCH) return(EP_UNSET); /* only error allowed */
|
|
printf("WARNING: get_mon_param() failed in env_parse(): %d\n",s);
|
|
return(EP_EGETKENV);
|
|
}
|
|
val = value;
|
|
if (strcmp(val, "off") == 0) return(EP_OFF);
|
|
if (strcmp(val, "on") == 0) return(EP_ON);
|
|
|
|
r = EP_ON;
|
|
for (;;) {
|
|
while (*val == ' ') val++; /* skip spaces */
|
|
if (*val == 0) return(r); /* the proper exit point */
|
|
if (*fmt == 0) break; /* too many values */
|
|
|
|
if (strchr(PUNCT, *val) != NULL) {
|
|
/* Time to go to the next field. */
|
|
if (strchr(PUNCT, *fmt) != NULL) i++;
|
|
if (*fmt++ == *val) val++;
|
|
if (*fmt < 32) fmt -= *fmt; /* step back? */
|
|
} else {
|
|
/* Environment contains a value, get it. */
|
|
switch (*fmt) {
|
|
case '*': radix = -1; break;
|
|
case 'd': radix = 10; break;
|
|
case 'o': radix = 010; break;
|
|
case 'x': radix = 0x10; break;
|
|
case 'c': radix = 0; break;
|
|
default: goto badenv;
|
|
}
|
|
|
|
if (radix < 0) {
|
|
/* Skip. */
|
|
while (strchr(PUNCT, *val) == NULL) val++;
|
|
continue;
|
|
} else {
|
|
/* A number. */
|
|
newpar = strtol(val, &end, radix);
|
|
|
|
if (end == val) break; /* not a number */
|
|
val = end;
|
|
}
|
|
|
|
if (i == field) {
|
|
/* The field requested. */
|
|
if (newpar < min || newpar > max) break;
|
|
*param = newpar;
|
|
r = EP_SET;
|
|
}
|
|
}
|
|
}
|
|
badenv:
|
|
env_panic(env);
|
|
}
|
|
|
|
|