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util/hexdump: introduce qemu_hexdump_line()

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Dumping one line of hexadecimal/ASCII from a buffer is often needed.
Move this part from qemu_hexdump() and use it

Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Message-Id: <20200925091055.186023-2-lvivier@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Laurent Vivier 2020-09-25 11:10:54 +02:00 committed by Michael S. Tsirkin
parent f68ec01fe9
commit bbb169080f
2 changed files with 42 additions and 20 deletions
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8
include/qemu-common.h
View File

@ -134,6 +134,14 @@ void os_setup_early_signal_handling(void);
char *os_find_datadir(void);
int os_parse_cmd_args(int index, const char *optarg);
/*
* Hexdump a line of a byte buffer into a hexadecimal/ASCII buffer
*/
#define QEMU_HEXDUMP_LINE_BYTES 16 /* Number of bytes to dump */
#define QEMU_HEXDUMP_LINE_LEN 75 /* Number of characters in line */
void qemu_hexdump_line(char *line, unsigned int b, const void *bufptr,
unsigned int len, bool ascii);
/*
* Hexdump a buffer to a file. An optional string prefix is added to every line
*/

54
util/hexdump.c
View File

@ -16,36 +16,50 @@
#include "qemu/osdep.h"
#include "qemu-common.h"
void qemu_hexdump(FILE *fp, const char *prefix,
const void *bufptr, size_t size)
void qemu_hexdump_line(char *line, unsigned int b, const void *bufptr,
unsigned int len, bool ascii)
{
const char *buf = bufptr;
unsigned int b, len, i, c;
int i, c;
for (b = 0; b < size; b += 16) {
len = size - b;
if (len > 16) {
len = 16;
if (len > QEMU_HEXDUMP_LINE_BYTES) {
len = QEMU_HEXDUMP_LINE_BYTES;
}
line += snprintf(line, 6, "%04x:", b);
for (i = 0; i < QEMU_HEXDUMP_LINE_BYTES; i++) {
if ((i % 4) == 0) {
*line++ = ' ';
}
fprintf(fp, "%s: %04x:", prefix, b);
for (i = 0; i < 16; i++) {
if ((i % 4) == 0) {
fprintf(fp, " ");
}
if (i < len) {
fprintf(fp, " %02x", (unsigned char)buf[b + i]);
} else {
fprintf(fp, " ");
}
if (i < len) {
line += sprintf(line, " %02x", (unsigned char)buf[b + i]);
} else {
line += sprintf(line, " ");
}
fprintf(fp, " ");
}
if (ascii) {
*line++ = ' ';
for (i = 0; i < len; i++) {
c = buf[b + i];
if (c < ' ' || c > '~') {
c = '.';
}
fprintf(fp, "%c", c);
*line++ = c;
}
fprintf(fp, "\n");
}
*line = '\0';
}
void qemu_hexdump(FILE *fp, const char *prefix,
const void *bufptr, size_t size)
{
unsigned int b, len;
char line[QEMU_HEXDUMP_LINE_LEN];
for (b = 0; b < size; b += QEMU_HEXDUMP_LINE_BYTES) {
len = size - b;
qemu_hexdump_line(line, b, bufptr, len, true);
fprintf(fp, "%s: %s\n", prefix, line);
}
}