1/* See LICENSE file for copyright and license details. */
  2
  3#include <errno.h>
  4#include <limits.h>
  5#include <stdlib.h>
  6#include <string.h>
  7#include <unistd.h>
  8
  9#include "util.h"
 10
 11struct var {
 12  const char *k;
 13  long        v;
 14};
 15
 16#include "getconf.h"
 17
 18void
 19usage(void)
 20{
 21  eprintf("usage: %s [-v spec] var [path]\n", argv0);
 22}
 23
 24// ?man getconf: query configuration variables
 25// ?man arguments: var [path]
 26// ?man query system configuration variables
 27int
 28main(int argc, char *argv[])
 29{
 30  size_t len;
 31  long   res;
 32  size_t i;
 33  char  *str;
 34
 35  ARGBEGIN
 36  {
 37    // ?man -v:str: verbose mode; show progress
 38    case 'v':
 39      /* ignore */
 40      EARGF(usage());
 41      break;
 42    default:
 43      usage();
 44      break;
 45  }
 46  ARGEND
 47
 48  if (argc == 1) {
 49    /* sysconf */
 50    for (i = 0; i < LEN(sysconf_l); i++) {
 51      if (strcmp(argv[0], sysconf_l[i].k))
 52        continue;
 53      errno = 0;
 54      if ((res = sysconf(sysconf_l[i].v)) < 0) {
 55        if (errno)
 56          eprintf("sysconf %ld:", sysconf_l[i].v);
 57        puts("undefined");
 58      } else {
 59        printf("%ld\n", res);
 60      }
 61      return fshut(stdout, "<stdout>");
 62    }
 63    /* confstr */
 64    for (i = 0; i < LEN(confstr_l); i++) {
 65      if (strcmp(argv[0], confstr_l[i].k))
 66        continue;
 67      errno = 0;
 68      if (!(len = confstr(confstr_l[i].v, NULL, 0))) {
 69        if (errno)
 70          eprintf("confstr %ld:", confstr_l[i].v);
 71        puts("undefined");
 72      } else {
 73        str   = emalloc(len);
 74        errno = 0;
 75        if (!confstr(confstr_l[i].v, str, len)) {
 76          if (errno)
 77            eprintf("confstr %ld:", confstr_l[i].v);
 78          puts("undefined");
 79        } else {
 80          puts(str);
 81        }
 82        free(str);
 83      }
 84      return fshut(stdout, "<stdout>");
 85    }
 86    /* limits */
 87    for (i = 0; i < LEN(limits_l); i++) {
 88      if (strcmp(argv[0], limits_l[i].k))
 89        continue;
 90      printf("%ld\n", limits_l[i].v);
 91      return fshut(stdout, "<stdout>");
 92    }
 93  } else if (argc == 2) {
 94    /* pathconf */
 95    for (i = 0; i < LEN(pathconf_l); i++) {
 96      if (strcmp(argv[0], pathconf_l[i].k))
 97        continue;
 98      errno = 0;
 99      if ((res = pathconf(argv[1], pathconf_l[i].v)) < 0) {
100        if (errno)
101          eprintf("pathconf %ld:", pathconf_l[i].v);
102        puts("undefined");
103      } else {
104        printf("%ld\n", res);
105      }
106      return fshut(stdout, "<stdout>");
107    }
108  } else {
109    usage();
110  }
111
112  eprintf("invalid variable: %s\n", argv[0]);
113
114  return 0;
115}