sbase

suckless unix tools
git clone git://git.suckless.org/sbase
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getconf.c (2048B)

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