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authorShao Miller <sha0.miller@gmail.com>2012-11-04 00:26:32 -0400
committerShao Miller <sha0.miller@gmail.com>2012-11-04 00:26:32 -0400
commitc9c67dd61ba0b11e46d514601cf0722e1b43017c (patch)
treee36096be2de3a5ceb47a9cd237852f0f28ebd1d8
parent28b3a9d4d7eb932b827122f3e641ce14fb2cbd03 (diff)
downloadsyslinux-hexdump.tar.gz
syslinux-hexdump.tar.xz
syslinux-hexdump.zip
hexdump.c32: Simple file hex-dumperhexdump
Usage: %s [<option> [...]] <filename> [<option> [...]] Options: -p --page . . . . . . . Pause output every 24 lines --no-buffer . . . . Load the entire file before dumping --extended-ascii . . Use extended ASCII chars in dump -? -h --help . . . . . . Display this help Signed-off-by: Shao Miller <sha0.miller@gmail.com>
-rw-r--r--com32/modules/Makefile3
-rw-r--r--com32/modules/hexdump.c245
2 files changed, 247 insertions, 1 deletions
diff --git a/com32/modules/Makefile b/com32/modules/Makefile
index ee428e30..9cf4da8e 100644
--- a/com32/modules/Makefile
+++ b/com32/modules/Makefile
@@ -24,7 +24,8 @@ MODULES = config.c32 ethersel.c32 dmitest.c32 cpuidtest.c32 \
meminfo.c32 sdi.c32 sanboot.c32 ifcpu64.c32 vesainfo.c32 \
kbdmap.c32 cmd.c32 vpdtest.c32 host.c32 ls.c32 gpxecmd.c32 \
ifcpu.c32 cpuid.c32 cat.c32 pwd.c32 ifplop.c32 zzjson.c32 \
- whichsys.c32 prdhcp.c32 pxechn.c32 kontron_wdt.c32 ifmemdsk.c32
+ whichsys.c32 prdhcp.c32 pxechn.c32 kontron_wdt.c32 ifmemdsk.c32 \
+ hexdump.c32
TESTFILES =
diff --git a/com32/modules/hexdump.c b/com32/modules/hexdump.c
new file mode 100644
index 00000000..bc2c70dd
--- /dev/null
+++ b/com32/modules/hexdump.c
@@ -0,0 +1,245 @@
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <console.h>
+#include <errno.h>
+#include <syslinux/loadfile.h>
+
+/* Macros */
+#define ROWS_PER_PAGE 24
+#define COLS_PER_ROW 16
+#define BYTES_PER_PAGE (ROWS_PER_PAGE * COLS_PER_ROW)
+
+/* Functions declarations */
+static int usage(void);
+static void eat_stdin(void);
+static int do_page(void);
+static void hexdump(const void *memory, size_t bytes);
+
+/* Objects */
+static const char *prog_name;
+static int opt_page;
+static int opt_no_buffer;
+static int opt_extended_ascii;
+
+int main(int argc, char **argv)
+{
+ int rc;
+ const char *filename;
+ int i;
+ void *file_data;
+ size_t file_sz;
+ FILE *f;
+ size_t len;
+ const char *cur_pos;
+
+ /* Assume failure */
+ rc = EXIT_FAILURE;
+
+ /* Determine the program name, as invoked */
+ if (argc < 1 || !argv || !argv[0]) {
+ fprintf(stderr, "argc or argv failure!\n");
+ goto err_prog_name;
+ }
+ prog_name = argv[0];
+
+ /* Process arguments */
+ filename = NULL;
+ for (i = 1; i < argc; ++i) {
+ if (!argv[i]) {
+ fprintf(stderr, "argc and argv mismatch!\n");
+ goto err_argv;
+ }
+
+ if (!strncmp(argv[i], "--page", sizeof "--page") ||
+ !strncmp(argv[i], "-p", sizeof "-p")) {
+ opt_page = 1;
+ continue;
+ }
+
+ if (!strncmp(argv[i], "--no-buffer", sizeof "--no-buffer")) {
+ opt_no_buffer = 1;
+ continue;
+ }
+
+ if (!strncmp(argv[i], "--extended-ascii", sizeof "--extended-ascii")) {
+ opt_extended_ascii = 1;
+ continue;
+ }
+
+ if (!strncmp(argv[i], "--help", sizeof "--help") ||
+ !strncmp(argv[i], "-h", sizeof "-h") ||
+ !strncmp(argv[i], "-?", sizeof "-?"))
+ return usage();
+
+ /* Otherwise, interpret as a filename, but only accept one */
+ if (filename)
+ return usage();
+ filename = argv[i];
+ }
+ if (!filename)
+ return usage();
+ fprintf(stdout, "Dumping file: %s\n", filename);
+
+ /* Either fetch the whole file, or just allocate a buffer */
+ f = NULL;
+ if (opt_no_buffer) {
+ errno = 0;
+ if (loadfile(filename, &file_data, &file_sz)) {
+ fprintf(stderr, "Couldn't load file. Error: %d\n", errno);
+ goto err_file_data;
+ }
+ } else {
+ file_sz = BYTES_PER_PAGE;
+ file_data = malloc(file_sz);
+ if (!file_data) {
+ fprintf(stderr, "Couldn't allocate file data buffer\n");
+ goto err_file_data;
+ }
+ errno = 0;
+ f = fopen(filename, "r");
+ if (!f) {
+ fprintf(stderr, "Couldn't open file. Error: %d\n", errno);
+ goto err_f;
+ }
+ }
+
+ /* Dump the data */
+ len = BYTES_PER_PAGE;
+ cur_pos = file_data;
+ do {
+ if (f) {
+ /* Buffered */
+ len = fread(file_data, 1, file_sz, f);
+ cur_pos = file_data;
+ } else {
+ /* Non-buffered */
+ if (file_sz < len)
+ len = file_sz;
+ }
+ if (!len)
+ break;
+
+ hexdump(cur_pos, len);
+
+ /* Pause, if requested */
+ if (opt_page) {
+ /* The user might choose to quit */
+ if (do_page())
+ break;
+ }
+
+ /* Reduce file_sz for non-buffered mode */
+ if (!f)
+ file_sz -= len;
+ } while (cur_pos += len);
+
+ rc = EXIT_SUCCESS;
+
+ if (f)
+ fclose(f);
+ err_f:
+
+ free(file_data);
+ err_file_data:
+
+ err_argv:
+
+ err_prog_name:
+
+ return rc;
+}
+
+static int usage(void)
+{
+ static const char usage[] =
+ "Usage: %s [<option> [...]] <filename> [<option> [...]]\n"
+ "\n"
+ "Options: -p\n"
+ " --page . . . . . . . Pause output every 24 lines\n"
+ " --no-buffer . . . . Load the entire file before dumping\n"
+ " --extended-ascii . . Use extended ASCII chars in dump\n"
+ " -?\n"
+ " -h\n"
+ " --help . . . . . . Display this help\n";
+
+ fprintf(stderr, usage, prog_name);
+ return EXIT_FAILURE;
+}
+
+static void eat_stdin(void)
+{
+ int i;
+
+ while (1) {
+ i = fgetc(stdin);
+ if (i == EOF || i == '\n')
+ return;
+ }
+}
+static int do_page(void)
+{
+ int i;
+
+ while (1) {
+ fprintf(stdout, "Continue? [Y|n]: ");
+ i = fgetc(stdin);
+ switch (i) {
+ case 'n':
+ case 'N':
+ eat_stdin();
+ return 1;
+
+ case EOF:
+ fprintf(stderr, "No response. Continuing...\n");
+ /* Fall through to "yes" */
+
+ case 'y':
+ case 'Y':
+ eat_stdin();
+ case '\n':
+ return 0;
+
+ default:
+ fprintf(stderr, "Invalid choice\n");
+ eat_stdin();
+ }
+ }
+}
+
+static void hexdump(const void *memory, size_t bytes)
+{
+ const unsigned char *p, *q;
+ int i;
+
+ p = memory;
+ while (bytes) {
+ q = p;
+ printf("%p: ", (void *) p);
+ for (i = 0; i < 16 && bytes; ++i) {
+ printf("%02X ", *p);
+ ++p;
+ --bytes;
+ }
+ bytes += i;
+ while (i < 16) {
+ printf("XX ");
+ ++i;
+ }
+ printf("| ");
+ p = q;
+ for (i = 0; i < 16 && bytes; ++i) {
+ printf("%c", isprint(*p) && !isspace(*p) ? *p : ' ');
+ ++p;
+ --bytes;
+ }
+ while (i < 16) {
+ printf(" ");
+ ++i;
+ }
+ printf("\n");
+ }
+ return;
+}