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label.c revision 1.22 
      1 /*-
      2  * Copyright (c) 2005 Marcel Moolenaar
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  *
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25  */
     26 
     27 #if HAVE_NBTOOL_CONFIG_H
     28 #include "nbtool_config.h"
     29 #endif
     30 
     31 #include <sys/cdefs.h>
     32 #ifdef __FBSDID
     33 __FBSDID("$FreeBSD: src/sbin/gpt/label.c,v 1.3 2006/10/04 18:20:25 marcel Exp $");
     34 #endif
     35 #ifdef __RCSID
     36 __RCSID("$NetBSD: label.c,v 1.22 2015/12/01 19:25:24 christos Exp $");
     37 #endif
     38 
     39 #include <sys/types.h>
     40 
     41 #include <err.h>
     42 #include <stddef.h>
     43 #include <stdio.h>
     44 #include <stdlib.h>
     45 #include <string.h>
     46 #include <unistd.h>
     47 
     48 #include "map.h"
     49 #include "gpt.h"
     50 #include "gpt_private.h"
     51 #include "gpt_uuid.h"
     52 
     53 static int cmd_label(gpt_t, int, char *[]);
     54 
     55 static const char *labelhelp[] = {
     56     "-a <-l label | -f file>",
     57     "[-b blocknr] [-i index] [-L label] [-s sectors] [-t uuid] <-l label | -f file>",
     58 };
     59 
     60 struct gpt_cmd c_label = {
     61 	"label",
     62 	cmd_label,
     63 	labelhelp, __arraycount(labelhelp),
     64 	0,
     65 };
     66 
     67 #define usage() gpt_usage(NULL, &c_label)
     68 
     69 static void
     70 change(struct gpt_ent *ent, void *v)
     71 {
     72 	uint8_t *name = v;
     73 	utf8_to_utf16(name, ent->ent_name, 36);
     74 }
     75 
     76 static char *
     77 name_from_file(const char *fn)
     78 {
     79 	FILE *f;
     80 	char *p;
     81 	size_t maxlen = 1024;
     82 	size_t len;
     83 	char *name;
     84 
     85 	if (strcmp(fn, "-") != 0) {
     86 		f = fopen(fn, "r");
     87 		if (f == NULL)
     88 			err(1, "unable to open file %s", fn);
     89 	} else
     90 		f = stdin;
     91 	name = malloc(maxlen);
     92 	len = fread(name, 1, maxlen - 1, f);
     93 	if (ferror(f))
     94 		err(1, "unable to read label from file %s", fn);
     95 	if (f != stdin)
     96 		fclose(f);
     97 	name[len] = '\0';
     98 	/* Only keep the first line, excluding the newline character. */
     99 	p = strchr((const char *)name, '\n');
    100 	if (p != NULL)
    101 		*p = '\0';
    102 	return name;
    103 }
    104 
    105 static int
    106 cmd_label(gpt_t gpt, int argc, char *argv[])
    107 {
    108 	int ch;
    109 	struct gpt_find find;
    110 	char *name = NULL;
    111 
    112 	memset(&find, 0, sizeof(find));
    113 	find.msg = "label changed";
    114 
    115 	/* Get the label options */
    116 	while ((ch = getopt(argc, argv, GPT_FIND "f:l:")) != -1) {
    117 		switch(ch) {
    118 		case 'f':
    119 			if (name != NULL)
    120 				return usage();
    121 			name = name_from_file(optarg);
    122 			break;
    123 		case 'l':
    124 			if (name != NULL)
    125 				return usage();
    126 			name = strdup(optarg);
    127 			break;
    128 		default:
    129 			if (gpt_add_find(gpt, &find, ch) == -1)
    130 				return usage();
    131 			break;
    132 		}
    133 	}
    134 
    135 	if (name == NULL || argc != optind)
    136 		return usage();
    137 
    138 	return gpt_change_ent(gpt, &find, change, name);
    139 }
    140