MINOR: tools: add a generic hexdump function for debugging
debug_hexdump() prints to the requested output stream (typically stdout
or stderr) an hex dump of the blob passed in argument. This is useful
to help debug binary protocols.
diff --git a/include/common/standard.h b/include/common/standard.h
index e16b304..68244db 100644
--- a/include/common/standard.h
+++ b/include/common/standard.h
@@ -24,6 +24,7 @@
#include <limits.h>
#include <string.h>
+#include <stdio.h>
#include <time.h>
#include <sys/time.h>
#include <sys/types.h>
@@ -990,6 +991,11 @@
*/
#define fddebug(msg...) do { char *_m = NULL; memprintf(&_m, ##msg); if (_m) write(-1, _m, strlen(_m)); free(_m); } while (0)
+/* displays a <len> long memory block at <buf>, assuming first byte of <buf>
+ * has address <baseaddr>. The output is emitted to file <out>.
+ */
+void debug_hexdump(FILE *out, char *buf, unsigned int baseaddr, int len);
+
/* used from everywhere just to drain results we don't want to read and which
* recent versions of gcc increasingly and annoyingly complain about.
*/
diff --git a/src/standard.c b/src/standard.c
index 079aef8..910e1c2 100644
--- a/src/standard.c
+++ b/src/standard.c
@@ -3765,6 +3765,51 @@
return ptr;
}
+/* displays a <len> long memory block at <buf>, assuming first byte of <buf>
+ * has address <baseaddr>. The output is emitted to file <out>.
+ */
+void debug_hexdump(FILE *out, char *buf, unsigned int baseaddr, int len)
+{
+ unsigned int i, j;
+ int b;
+
+ for (i = 0; i < (len + (baseaddr & 15)); i += 16) {
+ b = i - (baseaddr & 15);
+ fprintf(out, "%08x: ", i + (baseaddr & ~15));
+ for (j = 0; j < 8; j++) {
+ if (b + j >= 0 && b + j < len)
+ fprintf(out, "%02x ", (unsigned char)buf[b + j]);
+ else
+ fprintf(out, " ");
+ }
+
+ if (b + j >= 0 && b + j < len)
+ fputc('-', out);
+ else
+ fputc(' ', out);
+
+ for (j = 8; j < 16; j++) {
+ if (b + j >= 0 && b + j < len)
+ fprintf(out, " %02x", (unsigned char)buf[b + j]);
+ else
+ fprintf(out, " ");
+ }
+
+ fprintf(out, " ");
+ for (j = 0; j < 16; j++) {
+ if (b + j >= 0 && b + j < len) {
+ if (isprint((unsigned char)buf[b + j]))
+ fputc((unsigned char)buf[b + j], out);
+ else
+ fputc('.', out);
+ }
+ else
+ fputc(' ', out);
+ }
+ fputc('\n', out);
+ }
+}
+
/*
* Local variables:
* c-indent-level: 8