od: code shrink, fix "od --traditional FILE"
function old new delta parse_old_offset 107 125 +18 packed_usage 28715 28691 -24 od_main 2312 2275 -37 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
232ebaa568
commit
5c10fa5c24
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@ -11,11 +11,12 @@
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* Original copyright notice is retained at the end of this file.
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*/
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//usage:#if !ENABLE_DESKTOP
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//usage:#define od_trivial_usage
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//usage: "[-aBbcDdeFfHhIiLlOovXx] " IF_DESKTOP("[-t TYPE] ") "[FILE]"
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//usage: "[-aBbcDdeFfHhIiLlOovXx] [FILE]"
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//usage:#define od_full_usage "\n\n"
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//usage: "Write an unambiguous representation, octal bytes by default, of FILE\n"
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//usage: "(or stdin) to stdout"
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//usage: "Print FILE (or stdin) unambiguously, as octal bytes by default"
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//usage:#endif
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#include "libbb.h"
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#if ENABLE_DESKTOP
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@ -13,43 +13,24 @@
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/* Written by Jim Meyering. */
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/* Busyboxed by Denys Vlasenko, based on od.c from coreutils-5.2.1 */
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/* Busyboxed by Denys Vlasenko
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//usage:#if ENABLE_DESKTOP
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//usage:#define od_trivial_usage
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//usage: "[-abcdfhilovxs] [-t TYPE] [-A RADIX] [-N SIZE] [-j SKIP] [-S MINSTR] [-w WIDTH] [FILE...]"
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// We don't support:
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// ... [FILE] [[+]OFFSET[.][b]]
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// Support is buggy for:
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// od --traditional [OPTION]... [FILE] [[+]OFFSET[.][b] [+][LABEL][.][b]]
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Based on od.c from coreutils-5.2.1
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Top bloat sources:
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//usage:#define od_full_usage "\n\n"
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//usage: "Print FILEs (or stdin) unambiguously, as octal bytes by default"
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//usage:#endif
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00000073 t parse_old_offset
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0000007b t get_lcm
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00000090 r long_options
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00000092 t print_named_ascii
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000000bf t print_ascii
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00000168 t write_block
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00000366 t decode_format_string
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00000a71 T od_main
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Tested for compat with coreutils 6.3
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using this script. Minor differences fixed.
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#!/bin/sh
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echo STD
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time /path/to/coreutils/od \
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...params... \
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>std
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echo Exit code $?
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echo BBOX
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time ./busybox od \
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...params... \
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>bbox
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echo Exit code $?
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diff -u -a std bbox >bbox.diff || { echo Different!; sleep 1; }
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*/
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#include "libbb.h"
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/* #include "libbb.h" - done in od.c */
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#define assert(a) ((void)0)
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@ -214,7 +195,7 @@ static const unsigned char integral_type_size[MAX_INTEGRAL_TYPE_SIZE + 1] ALIGN1
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#define MAX_FP_TYPE_SIZE sizeof(longdouble_t)
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static const unsigned char fp_type_size[MAX_FP_TYPE_SIZE + 1] ALIGN1 = {
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/* gcc seems to allow repeated indexes. Last one stays */
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/* gcc seems to allow repeated indexes. Last one wins */
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[sizeof(longdouble_t)] = FLOAT_LONG_DOUBLE,
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[sizeof(double)] = FLOAT_DOUBLE,
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[sizeof(float)] = FLOAT_SINGLE
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@ -376,7 +357,7 @@ print_named_ascii(size_t n_bytes, const char *block,
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};
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// buf[N] pos: 01234 56789
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char buf[12] = " x\0 0xx\0";
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// actually " x\0 xxx\0", but I want to share the string with below.
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// actually " x\0 xxx\0", but want to share string with print_ascii.
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// [12] because we take three 32bit stack slots anyway, and
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// gcc is too dumb to initialize with constant stores,
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// it copies initializer from rodata. Oh well.
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@ -954,42 +935,6 @@ get_lcm(void)
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return l_c_m;
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}
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#if ENABLE_LONG_OPTS
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/* If S is a valid traditional offset specification with an optional
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leading '+' return nonzero and set *OFFSET to the offset it denotes. */
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static int
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parse_old_offset(const char *s, off_t *offset)
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{
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static const struct suffix_mult Bb[] = {
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{ "B", 1024 },
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{ "b", 512 },
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{ "", 0 }
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};
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char *p;
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int radix;
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/* Skip over any leading '+'. */
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if (s[0] == '+') ++s;
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/* Determine the radix we'll use to interpret S. If there is a '.',
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* it's decimal, otherwise, if the string begins with '0X'or '0x',
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* it's hexadecimal, else octal. */
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p = strchr(s, '.');
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radix = 8;
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if (p) {
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p[0] = '\0'; /* cheating */
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radix = 10;
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} else if (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'))
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radix = 16;
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*offset = xstrtooff_sfx(s, radix, Bb);
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if (p) p[0] = '.';
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return (*offset >= 0);
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}
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#endif
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/* Read a chunk of size BYTES_PER_BLOCK from the input files, write the
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formatted block to standard output, and repeat until the specified
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maximum number of bytes has been read or until all input has been
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@ -1172,8 +1117,45 @@ dump_strings(off_t address, off_t end_offset)
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check_and_close();
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}
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#if ENABLE_LONG_OPTS
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/* If S is a valid traditional offset specification with an optional
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leading '+' return nonzero and set *OFFSET to the offset it denotes. */
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static int
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parse_old_offset(const char *s, off_t *offset)
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{
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static const struct suffix_mult Bb[] = {
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{ "B", 1024 },
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{ "b", 512 },
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{ "", 0 }
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};
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char *p;
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int radix;
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/* Skip over any leading '+'. */
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if (s[0] == '+') ++s;
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if (!isdigit(s[0])) return 0; /* not a number */
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/* Determine the radix we'll use to interpret S. If there is a '.',
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* it's decimal, otherwise, if the string begins with '0X'or '0x',
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* it's hexadecimal, else octal. */
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p = strchr(s, '.');
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radix = 8;
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if (p) {
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p[0] = '\0'; /* cheating */
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radix = 10;
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} else if (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'))
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radix = 16;
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*offset = xstrtooff_sfx(s, radix, Bb);
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if (p) p[0] = '.';
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return (*offset >= 0);
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}
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#endif
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int od_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int od_main(int argc, char **argv)
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int od_main(int argc UNUSED_PARAM, char **argv)
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{
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static const struct suffix_mult bkm[] = {
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{ "b", 512 },
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@ -1245,7 +1227,6 @@ int od_main(int argc, char **argv)
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// but in coreutils 6.3 it was renamed and now has
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// _mandatory_ parameter
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&str_A, &str_N, &str_j, &lst_t, &str_S, &bytes_per_block);
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argc -= optind;
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argv += optind;
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if (opt & OPT_A) {
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static const char doxn[] ALIGN1 = "doxn";
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@ -1288,7 +1269,6 @@ int od_main(int argc, char **argv)
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if (opt & OPT_x) decode_format_string("x2");
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if (opt & OPT_s) decode_format_string("d2");
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if (opt & OPT_S) {
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string_min = 3;
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string_min = xstrtou_sfx(str_S, 0, bkm);
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flag_dump_strings = 1;
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}
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@ -1301,7 +1281,7 @@ int od_main(int argc, char **argv)
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/* If the --traditional option is used, there may be from
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* 0 to 3 remaining command line arguments; handle each case
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* separately.
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* od [file] [[+]offset[.][b] [[+]label[.][b]]]
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* od [FILE] [[+]OFFSET[.][b] [[+]LABEL[.][b]]]
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* The offset and pseudo_start have the same syntax.
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*
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* FIXME: POSIX 1003.1-2001 with XSI requires support for the
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@ -1311,48 +1291,47 @@ int od_main(int argc, char **argv)
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if (opt & OPT_traditional) {
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off_t o1, o2;
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if (argc == 1) {
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if (parse_old_offset(argv[0], &o1)) {
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n_bytes_to_skip = o1;
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--argc;
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++argv;
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if (argv[0]) {
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if (!argv[1]) { /* one arg */
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if (parse_old_offset(argv[0], &o1)) {
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/* od --traditional OFFSET */
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n_bytes_to_skip = o1;
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argv++;
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}
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/* od --traditional FILE */
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} else if (!argv[2]) { /* two args */
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if (parse_old_offset(argv[0], &o1)
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&& parse_old_offset(argv[1], &o2)
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) {
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/* od --traditional OFFSET LABEL */
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n_bytes_to_skip = o1;
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flag_pseudo_start = 1;
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pseudo_start = o2;
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argv += 2;
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} else if (parse_old_offset(argv[1], &o2)) {
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/* od --traditional FILE OFFSET */
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n_bytes_to_skip = o2;
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argv[1] = NULL;
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} else {
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bb_error_msg_and_die("invalid second argument '%s'", argv[1]);
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}
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} else if (!argv[3]) { /* three args */
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if (parse_old_offset(argv[1], &o1)
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&& parse_old_offset(argv[2], &o2)
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) {
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/* od --traditional FILE OFFSET LABEL */
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n_bytes_to_skip = o1;
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flag_pseudo_start = 1;
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pseudo_start = o2;
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argv[1] = NULL;
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} else {
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bb_error_msg_and_die("the last two arguments must be offsets");
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}
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} else { /* >3 args */
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bb_error_msg_and_die("too many arguments");
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}
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} else if (argc == 2) {
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if (parse_old_offset(argv[0], &o1)
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&& parse_old_offset(argv[1], &o2)
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) {
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n_bytes_to_skip = o1;
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flag_pseudo_start = 1;
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pseudo_start = o2;
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argv += 2;
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argc -= 2;
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} else if (parse_old_offset(argv[1], &o2)) {
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n_bytes_to_skip = o2;
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--argc;
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argv[1] = argv[0];
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++argv;
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} else {
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bb_error_msg_and_die("invalid second operand "
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"in compatibility mode '%s'", argv[1]);
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}
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} else if (argc == 3) {
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if (parse_old_offset(argv[1], &o1)
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&& parse_old_offset(argv[2], &o2)
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) {
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n_bytes_to_skip = o1;
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flag_pseudo_start = 1;
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pseudo_start = o2;
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argv[2] = argv[0];
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argv += 2;
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argc -= 2;
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} else {
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bb_error_msg_and_die("in compatibility mode "
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"the last two arguments must be offsets");
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}
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} else if (argc > 3) {
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bb_error_msg_and_die("compatibility mode supports "
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"at most three arguments");
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}
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/* else: od --traditional (without args) */
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if (flag_pseudo_start) {
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if (format_address == format_address_none) {
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@ -1368,7 +1347,7 @@ int od_main(int argc, char **argv)
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if (limit_bytes_to_format) {
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end_offset = n_bytes_to_skip + max_bytes_to_format;
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if (end_offset < n_bytes_to_skip)
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bb_error_msg_and_die("skip-bytes + read-bytes is too large");
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bb_error_msg_and_die("SKIP + SIZE is too large");
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}
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if (n_specs == 0) {
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@ -1380,7 +1359,7 @@ int od_main(int argc, char **argv)
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set the global pointer FILE_LIST so that it
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references the null-terminated list of one name: "-". */
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file_list = bb_argv_dash;
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if (argc > 0) {
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if (argv[0]) {
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/* Set the global pointer FILE_LIST so that it
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references the first file-argument on the command-line. */
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file_list = (char const *const *) argv;
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@ -4,7 +4,7 @@
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. ./testing.sh
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# testing "test name" "options" "expected result" "file input" "stdin"
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# testing "test name" "commands" "expected result" "file input" "stdin"
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optional DESKTOP
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testing "od -b" \
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@ -16,4 +16,24 @@ testing "od -b" \
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"" "HELLO"
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SKIP=
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optional DESKTOP
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testing "od -b --traditional" \
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"od -b --traditional" \
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"\
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0000000 110 105 114 114 117
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0000005
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" \
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"" "HELLO"
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SKIP=
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optional DESKTOP
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testing "od -b --traditional FILE" \
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"od -b --traditional input" \
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"\
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0000000 110 105 114 114 117
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0000005
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" \
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"HELLO" ""
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SKIP=
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exit $FAILCOUNT
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