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Annotation of src/usr.bin/readlink/readlink.c, Revision 1.22

1.3       kstailey    1: /*
1.22    ! deraadt     2:  * $OpenBSD: readlink.c,v 1.19 2003/06/10 22:20:50 deraadt Exp $
1.3       kstailey    3:  *
                      4:  * Copyright (c) 1997
                      5:  *     Kenneth Stailey (hereinafter referred to as the author)
                      6:  *
                      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
                     15:  * 3. The name of the author may not be used to endorse or promote products
                     16:  *    derived from this software without specific prior written permission.
                     17:  *
                     18:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     19:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     20:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     21:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
                     22:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
                     23:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     24:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     25:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     26:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
                     27:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     28:  */
                     29:
1.9       kstailey   30: #include <limits.h>
1.22    ! deraadt    31: #include <errno.h>
1.1       kstailey   32: #include <stdio.h>
1.12      niklas     33: #include <stdlib.h>
1.10      niklas     34: #include <string.h>
1.1       kstailey   35: #include <unistd.h>
                     36:
                     37: int
1.19      deraadt    38: main(int argc, char *argv[])
1.1       kstailey   39: {
                     40:        char buf[PATH_MAX];
1.22    ! deraadt    41:        int n, ch, nflag = 0, fflag = 0;
        !            42:        extern int optind;
1.1       kstailey   43:
1.10      niklas     44:        while ((ch = getopt(argc, argv, "fn")) != -1)
1.8       kstailey   45:                switch (ch) {
1.10      niklas     46:                case 'f':
                     47:                        fflag = 1;
                     48:                        break;
1.8       kstailey   49:                case 'n':
                     50:                        nflag = 1;
                     51:                        break;
                     52:                default:
1.22    ! deraadt    53:                        (void)fprintf(stderr,
        !            54:                            "usage: readlink [-n] [-f] symlink\n");
        !            55:                        exit(1);
1.8       kstailey   56:                }
                     57:        argc -= optind;
                     58:        argv += optind;
                     59:
1.22    ! deraadt    60:        if (argc != 1) {
        !            61:                fprintf(stderr, "usage: readlink [-n] [-f] symlink\n");
        !            62:                exit(1);
        !            63:        }
        !            64:
        !            65:        n = strlen(argv[0]);
        !            66:        if (n > PATH_MAX - 1) {
        !            67:                fprintf(stderr,
        !            68:                        "readlink: filename longer than PATH_MAX-1 (%d)\n",
        !            69:                        PATH_MAX - 1);
        !            70:                exit(1);
        !            71:        }
1.10      niklas     72:
1.22    ! deraadt    73:        if (fflag)
        !            74:                realpath(argv[0], buf);
        !            75:        else {
1.18      kstailey   76:                if ((n = readlink(argv[0], buf, sizeof buf-1)) < 0)
1.22    ! deraadt    77:                        exit(1);
1.18      kstailey   78:                buf[n] = '\0';
1.17      kstailey   79:        }
1.4       grr        80:
                     81:        printf("%s", buf);
1.8       kstailey   82:        if (!nflag)
                     83:                putchar('\n');
1.1       kstailey   84:        exit(0);
                     85: }