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hexdump: add hd alias, add -R option

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This commit is contained in:
Denis Vlasenko
2007-11-18 05:36:50 +00:00
parent 16aec39ebe
commit fbe5f39f0f
4 changed files with 108 additions and 32 deletions
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16
util-linux/Config.in
View File

@@ -210,6 +210,22 @@ config HEXDUMP
The hexdump utility is used to display binary data in a readable
way that is comparable to the output from most hex editors.
config HD
bool "hd"
default n
help
hd is an alias to hexdump -C.
config FEATURE_HEXDUMP_REVERSE
bool "Support -R, reverse of 'hexdump -Cv'"
default n
depends on HEXDUMP
help
The hexdump utility is used to display binary data in an ascii
readable way. This option creates binary data from an ascii input.
NB: this option is non-standard. It's unwise to use it in scripts
aimed to be portable.
config HWCLOCK
bool "hwclock"
default n

90
util-linux/hexdump.c
View File

@@ -45,7 +45,7 @@ static const char *const add_strings[] = {
static const char add_first[] ALIGN1 = "\"%07.7_Ax\n\"";
static const char hexdump_opts[] ALIGN1 = "bcdoxCe:f:n:s:v";
static const char hexdump_opts[] ALIGN1 = "bcdoxCe:f:n:s:v" USE_FEATURE_HEXDUMP_REVERSE("R");
static const struct suffix_mult suffixes[] = {
{ "b", 512 },
@@ -59,10 +59,21 @@ int hexdump_main(int argc, char **argv)
{
const char *p;
int ch;
#if ENABLE_FEATURE_HEXDUMP_REVERSE
FILE *fp;
smallint rdump = 0;
#endif
bb_dump_vflag = FIRST;
bb_dump_length = -1;
if (ENABLE_HD && !applet_name[2]) { /* we are "hd" */
ch = 'C';
goto hd_applet;
}
/* We cannot use getopt32: in hexdump options are cumulative.
* E.g. hexdump -C -C file should dump each line twice */
while ((ch = getopt(argc, argv, hexdump_opts)) > 0) {
p = strchr(hexdump_opts, ch);
if (!p)
@@ -70,28 +81,34 @@ int hexdump_main(int argc, char **argv)
if ((p - hexdump_opts) < 5) {
bb_dump_add(add_first);
bb_dump_add(add_strings[(int)(p - hexdump_opts)]);
} else if (ch == 'C') {
}
/* Save a little bit of space below by omitting the 'else's. */
if (ch == 'C') {
hd_applet:
bb_dump_add("\"%08.8_Ax\n\"");
bb_dump_add("\"%08.8_ax \" 8/1 \"%02x \" \" \" 8/1 \"%02x \" ");
bb_dump_add("\" |\" 16/1 \"%_p\" \"|\\n\"");
} else {
/* Save a little bit of space below by omitting the 'else's. */
if (ch == 'e') {
bb_dump_add(optarg);
} /* else */
if (ch == 'f') {
bb_dump_addfile(optarg);
} /* else */
if (ch == 'n') {
bb_dump_length = xatoi_u(optarg);
} /* else */
if (ch == 's') {
bb_dump_skip = xatoul_range_sfx(optarg, 0, LONG_MAX, suffixes);
} /* else */
if (ch == 'v') {
bb_dump_vflag = ALL;
}
}
if (ch == 'e') {
bb_dump_add(optarg);
} /* else */
if (ch == 'f') {
bb_dump_addfile(optarg);
} /* else */
if (ch == 'n') {
bb_dump_length = xatoi_u(optarg);
} /* else */
if (ch == 's') {
bb_dump_skip = xatoul_range_sfx(optarg, 0, LONG_MAX, suffixes);
} /* else */
if (ch == 'v') {
bb_dump_vflag = ALL;
}
#if ENABLE_FEATURE_HEXDUMP_REVERSE
if (ch == 'R') {
rdump = 1;
}
#endif
}
if (!bb_dump_fshead) {
@@ -101,5 +118,40 @@ int hexdump_main(int argc, char **argv)
argv += optind;
#if !ENABLE_FEATURE_HEXDUMP_REVERSE
return bb_dump_dump(argv);
#else
if (!rdump) {
return bb_dump_dump(argv);
}
/* -R: reverse of 'hexdump -Cv' */
fp = stdin;
if (!*argv) {
argv--;
goto jump_in;
}
do {
char *buf;
fp = xfopen(*argv, "r");
jump_in:
while ((buf = xmalloc_getline(fp)) != NULL) {
p = buf;
while (1) {
/* skip address or previous byte */
while (isxdigit(*p)) p++;
while (*p == ' ') p++;
/* '|' char will break the line */
if (!isxdigit(*p) || sscanf(p, "%x ", &ch) != 1)
break;
putchar(ch);
}
free(buf);
}
fclose(fp);
} while (*++argv);
fflush_stdout_and_exit(EXIT_SUCCESS);
#endif
}