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-rw-r--r--toys/pending/xxd.c77
1 files changed, 30 insertions, 47 deletions
diff --git a/toys/pending/xxd.c b/toys/pending/xxd.c
index 03ead7c2..dee8c316 100644
--- a/toys/pending/xxd.c
+++ b/toys/pending/xxd.c
@@ -2,11 +2,13 @@
*
* Copyright 2015 The Android Open Source Project
*
+ * No obvious standard, output looks like:
+ * 0000000: 4c69 6e75 7820 7665 7273 696f 6e20 332e Linux version 3.
+ *
* TODO: support for reversing a hexdump back into the original data.
- * TODO: support > 4GiB files?
* TODO: -s seek
-USE_XXD(NEWTOY(xxd, ">1c#<0=16l#g#<0=2", TOYFLAG_USR|TOYFLAG_BIN))
+USE_XXD(NEWTOY(xxd, ">1c#<1>4096=16l#g#<1=2", TOYFLAG_USR|TOYFLAG_BIN))
config XXD
bool "xxd"
@@ -25,58 +27,39 @@ config XXD
#define FOR_xxd
#include "toys.h"
-static const char* hex_digits = "0123456789abcdef";
-
GLOBALS(
- long bytes_per_group; // -g
- long limit; // -l
- long bytes_per_line; // -c
+ long g;
+ long l;
+ long c;
)
-static void xxd_file(FILE *fp)
+static void do_xxd(int fd, char *name)
{
- // "0000000: 4c69 6e75 7820 7665 7273 696f 6e20 332e Linux version 3.".
- size_t hex_size = 8 + 2 +
- 2*TT.bytes_per_line + TT.bytes_per_line/TT.bytes_per_group + 1;
- size_t line_size = hex_size + TT.bytes_per_line + 1;
- char *line = xmalloc(line_size);
- int offset = 0, bytes_this_line = 0, index = 0, ch;
-
- memset(line, ' ', line_size);
- line[line_size - 1] = 0;
-
- while ((ch = getc(fp)) != EOF) {
- if (!bytes_this_line) index = sprintf(line, "%08x: ", offset);
- ++offset;
-
- line[index++] = hex_digits[(ch >> 4) & 0xf];
- line[index++] = hex_digits[ch & 0xf];
- line[hex_size + bytes_this_line] = (ch >= ' ' && ch <= '~') ? ch : '.';
-
- ++bytes_this_line;
- if (bytes_this_line == TT.bytes_per_line) {
- puts(line);
- memset(line, ' ', line_size - 1);
- bytes_this_line = 0;
- } else if (!(bytes_this_line % TT.bytes_per_group)) line[index++] = ' ';
- if ((toys.optflags & FLAG_l) && offset == TT.limit) break;
+ long long pos = 0;
+ int i, len, space;
+
+ while (0<(len = readall(fd, toybuf, (TT.l && TT.l-pos<TT.c)?TT.l-pos:TT.c))) {
+ printf("%08llx: ", pos);
+ pos += len;
+ space = 2*TT.c+TT.c/TT.g+1;
+
+ for (i=0; i<len;) {
+ space -= printf("%02x", toybuf[i]);
+ if (!(++i%TT.g)) {
+ putchar(' ');
+ space--;
+ }
+ }
+
+ printf("%*s", space, "");
+ for (i=0; i<len; i++)
+ putchar((toybuf[i]>=' ' && toybuf[i]<='~') ? toybuf[i] : '.');
+ putchar('\n');
}
- if (bytes_this_line) {
- line[hex_size + bytes_this_line] = 0;
- puts(line);
- }
-
- if (CFG_FREE) free(line);
+ if (len<0) perror_exit("read");
}
void xxd_main(void)
{
- FILE *fp;
-
- if (!*toys.optargs || !strcmp(*toys.optargs, "-")) fp = stdin;
- else fp = xfopen(*toys.optargs, "r");
-
- xxd_file(fp);
-
- fclose(fp);
+ loopfiles(toys.optargs, do_xxd);
}