88 lines
2.6 KiB
C
88 lines
2.6 KiB
C
#include "sysutil.h"
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#include <stdlib.h>
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#include <env.h>
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#include <string.h>
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#include <minix/param.h>
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/*=========================================================================*
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* env_parse *
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*=========================================================================*/
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int env_parse(const char *env, const char *fmt,
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int field, long *param, long min, long max)
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{
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/* Parse an environment variable setting, something like "DPETH0=300:3".
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* Panic if the parsing fails. Return EP_UNSET if the environment variable
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* is not set, EP_OFF if it is set to "off", EP_ON if set to "on" or a
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* field is left blank, or EP_SET if a field is given (return value through
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* *param). Punctuation may be used in the environment and format string,
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* fields in the environment string may be empty, and punctuation may be
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* missing to skip fields. The format string contains characters 'd', 'o',
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* 'x' and 'c' to indicate that 10, 8, 16, or 0 is used as the last argument
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* to strtol(). A '*' means that a field should be skipped. If the format
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* string contains something like "\4" then the string is repeated 4 characters
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* to the left.
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*/
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char *val, *end;
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char value[EP_BUF_SIZE];
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char PUNCT[] = ":,;.";
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long newpar;
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int s, i, radix, r;
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if ((s=env_get_param(env, value, sizeof(value))) != 0) {
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if (s == ESRCH) return(EP_UNSET); /* only error allowed */
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printf("WARNING: env_get_param() failed in env_parse(): %d\n",s);
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return(EP_EGETKENV);
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}
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val = value;
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if (strcmp(val, "off") == 0) return(EP_OFF);
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if (strcmp(val, "on") == 0) return(EP_ON);
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i = 0;
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r = EP_ON;
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for (;;) {
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while (*val == ' ') val++; /* skip spaces */
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if (*val == 0) return(r); /* the proper exit point */
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if (*fmt == 0) break; /* too many values */
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if (strchr(PUNCT, *val) != NULL) {
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/* Time to go to the next field. */
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if (strchr(PUNCT, *fmt) != NULL) i++;
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if (*fmt++ == *val) val++;
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if (*fmt < 32) fmt -= *fmt; /* step back? */
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} else {
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/* Environment contains a value, get it. */
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switch (*fmt) {
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case '*': radix = -1; break;
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case 'd': radix = 10; break;
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case 'o': radix = 010; break;
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case 'x': radix = 0x10; break;
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case 'c': radix = 0; break;
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default: goto badenv;
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}
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if (radix < 0) {
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/* Skip. */
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while (strchr(PUNCT, *val) == NULL) val++;
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continue;
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} else {
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/* A number. */
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newpar = strtol(val, &end, radix);
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if (end == val) break; /* not a number */
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val = end;
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}
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if (i == field) {
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/* The field requested. */
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if (newpar < min || newpar > max) break;
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*param = newpar;
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r = EP_SET;
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}
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}
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}
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badenv:
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env_panic(env);
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return -1;
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}
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