| 1 | #include "sysutil.h"
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| 2 | #include <stdlib.h>
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| 3 | #include <string.h>
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| 4 |
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| 5 |
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| 6 | /*=========================================================================*
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| 7 | * env_parse *
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| 8 | *=========================================================================*/
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| 9 | PUBLIC int env_parse(env, fmt, field, param, min, max)
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| 10 | char *env; /* environment variable to inspect */
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| 11 | char *fmt; /* template to parse it with */
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| 12 | int field; /* field number of value to return */
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| 13 | long *param; /* address of parameter to get */
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| 14 | long min, max; /* minimum and maximum values for the parameter */
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| 15 | {
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| 16 | /* Parse an environment variable setting, something like "DPETH0=300:3".
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| 17 | * Panic if the parsing fails. Return EP_UNSET if the environment variable
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| 18 | * is not set, EP_OFF if it is set to "off", EP_ON if set to "on" or a
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| 19 | * field is left blank, or EP_SET if a field is given (return value through
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| 20 | * *param). Punctuation may be used in the environment and format string,
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| 21 | * fields in the environment string may be empty, and punctuation may be
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| 22 | * missing to skip fields. The format string contains characters 'd', 'o',
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| 23 | * 'x' and 'c' to indicate that 10, 8, 16, or 0 is used as the last argument
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| 24 | * to strtol(). A '*' means that a field should be skipped. If the format
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| 25 | * string contains something like "\4" then the string is repeated 4 characters
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| 26 | * to the left.
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| 27 | */
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| 28 | char *val, *end;
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| 29 | char value[EP_BUF_SIZE];
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| 30 | char PUNCT[] = ":,;.";
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| 31 | long newpar;
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| 32 | int s, i, radix, r, keylen;
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| 33 |
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| 34 | if ((s=env_get_param(env, value, sizeof(value))) != 0) {
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| 35 | if (s == ESRCH) return(EP_UNSET); /* only error allowed */
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| 36 | printf("WARNING: get_mon_param() failed in env_parse(): %d\n",s);
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| 37 | return(EP_EGETKENV);
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| 38 | }
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| 39 | val = value;
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| 40 | if (strcmp(val, "off") == 0) return(EP_OFF);
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| 41 | if (strcmp(val, "on") == 0) return(EP_ON);
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| 42 |
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| 43 | i = 0;
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| 44 | r = EP_ON;
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| 45 | for (;;) {
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| 46 | while (*val == ' ') val++; /* skip spaces */
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| 47 | if (*val == 0) return(r); /* the proper exit point */
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| 48 | if (*fmt == 0) break; /* too many values */
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| 49 |
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| 50 | if (strchr(PUNCT, *val) != NULL) {
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| 51 | /* Time to go to the next field. */
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| 52 | if (strchr(PUNCT, *fmt) != NULL) i++;
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| 53 | if (*fmt++ == *val) val++;
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| 54 | if (*fmt < 32) fmt -= *fmt; /* step back? */
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| 55 | } else {
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| 56 | /* Environment contains a value, get it. */
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| 57 | switch (*fmt) {
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| 58 | case '*': radix = -1; break;
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| 59 | case 'd': radix = 10; break;
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| 60 | case 'o': radix = 010; break;
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| 61 | case 'x': radix = 0x10; break;
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| 62 | case 'c': radix = 0; break;
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| 63 | default: goto badenv;
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| 64 | }
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| 65 |
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| 66 | if (radix < 0) {
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| 67 | /* Skip. */
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| 68 | while (strchr(PUNCT, *val) == NULL) val++;
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| 69 | continue;
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| 70 | } else {
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| 71 | /* A number. */
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| 72 | newpar = strtol(val, &end, radix);
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| 73 |
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| 74 | if (end == val) break; /* not a number */
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| 75 | val = end;
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| 76 | }
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| 77 |
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| 78 | if (i == field) {
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| 79 | /* The field requested. */
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| 80 | if (newpar < min || newpar > max) break;
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| 81 | *param = newpar;
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| 82 | r = EP_SET;
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| 83 | }
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| 84 | }
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| 85 | }
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| 86 | badenv:
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| 87 | env_panic(env);
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| 88 | }
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| 89 |
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| 90 |
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