readlink.c - sbase - suckless unix tools
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       ---
       readlink.c (846B)
       ---
            1 /* See LICENSE file for copyright and license details. */
            2 #include <limits.h>
            3 #include <stdio.h>
            4 #include <stdlib.h>
            5 #include <string.h>
            6 #include <unistd.h>
            7 
            8 #include "util.h"
            9 
           10 static void
           11 usage(void)
           12 {
           13         eprintf("usage: %s [-fn] path\n", argv0);
           14 }
           15 
           16 int
           17 main(int argc, char *argv[])
           18 {
           19         char buf[PATH_MAX];
           20         ssize_t n;
           21         int nflag = 0, fflag = 0;
           22 
           23         ARGBEGIN {
           24         case 'f':
           25                 fflag = ARGC();
           26                 break;
           27         case 'n':
           28                 nflag = 1;
           29                 break;
           30         default:
           31                 usage();
           32         } ARGEND
           33 
           34         if (argc != 1)
           35                 usage();
           36 
           37         if (strlen(argv[0]) >= PATH_MAX)
           38                 eprintf("path too long\n");
           39 
           40         if (fflag) {
           41                 if (!realpath(argv[0], buf))
           42                         eprintf("realpath %s:", argv[0]);
           43         } else {
           44                 if ((n = readlink(argv[0], buf, PATH_MAX - 1)) < 0)
           45                         eprintf("readlink %s:", argv[0]);
           46                 buf[n] = '\0';
           47         }
           48 
           49         fputs(buf, stdout);
           50         if (!nflag)
           51                 putchar('\n');
           52 
           53         return fshut(stdout, "<stdout>");
           54 }