05a3537d66
parsing a textual UEFI Device Path, since otherwise it things the passed in path is a filename. While here, reduce the repetition of 8192. Sponsored by: Netflix
156 lines
3.5 KiB
C
156 lines
3.5 KiB
C
/*-
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* Copyright (c) 2016 Netflix, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <ctype.h>
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#include <efivar.h>
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#include <efivar-dp.h>
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#include <err.h>
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#include <getopt.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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/* options descriptor */
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static struct option longopts[] = {
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{ "format", no_argument, NULL, 'f' },
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{ "parse", no_argument, NULL, 'p' },
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{ NULL, 0, NULL, 0 }
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};
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static int flag_format, flag_parse;
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static void
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usage(void)
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{
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errx(1, "efidp [-fp]");
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}
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static ssize_t
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read_file(int fd, void **rv)
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{
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uint8_t *retval;
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size_t len;
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off_t off;
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ssize_t red;
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len = 4096;
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off = 0;
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retval = malloc(len);
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do {
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red = read(fd, retval + off, len - off);
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off += red;
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if (red < (ssize_t)(len - off))
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break;
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len *= 2;
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retval = reallocf(retval, len);
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if (retval == NULL)
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return -1;
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} while (1);
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*rv = retval;
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return off;
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}
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static void
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parse_args(int argc, char **argv)
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{
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int ch;
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while ((ch = getopt_long(argc, argv, "fp",
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longopts, NULL)) != -1) {
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switch (ch) {
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case 'f':
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flag_format++;
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break;
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case 'p':
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flag_parse++;
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break;
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if (argc >= 1)
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usage();
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if (flag_parse + flag_format != 1) {
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warnx("Can only use one of -p (--parse), "
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"and -f (--format)");
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usage();
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}
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}
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int
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main(int argc, char **argv)
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{
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void *data;
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ssize_t len;
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parse_args(argc, argv);
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len = read_file(STDIN_FILENO, &data);
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if (len == -1)
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err(1, "read");
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if (flag_format) {
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char buffer[4096];
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ssize_t fmtlen;
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fmtlen = efidp_format_device_path(buffer, sizeof(buffer),
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(const_efidp)data, len);
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if (fmtlen > 0)
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printf("%s\n", buffer);
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free(data);
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} else if (flag_parse) {
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efidp dp;
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ssize_t dplen;
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char *str, *walker;
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dplen = 8192;
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dp = malloc(dplen);
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str = realloc(data, len + 1);
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if (str == NULL || dp == NULL)
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errx(1, "Can't allocate memory.");
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str[len] = '\0';
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walker = str;
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while (isspace(*walker))
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walker++;
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dplen = efidp_parse_device_path(walker, dp, dplen);
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if (dplen == -1)
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errx(1, "Can't parse %s", walker);
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write(STDOUT_FILENO, dp, dplen);
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free(dp);
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free(str);
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}
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}
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