5 files changed, 37 insertions, 52 deletions

diff --git a/hw/dma/pl330.c b/hw/dma/pl330.c
index 70a502d245..5f89295af3 100644
--- a/hw/dma/pl330.c
+++ b/hw/dma/pl330.c
@@ -15,6 +15,7 @@
  */
 
 #include "qemu/osdep.h"
+#include "qemu/cutils.h"
 #include "hw/irq.h"
 #include "hw/qdev-properties.h"
 #include "hw/sysbus.h"
@@ -317,22 +318,14 @@ typedef struct PL330InsnDesc {
 
 static void pl330_hexdump(uint8_t *buf, size_t size)
 {
-    unsigned int b, i, len;
-    char tmpbuf[80];
-
-    for (b = 0; b < size; b += 16) {
-        len = size - b;
-        if (len > 16) {
-            len = 16;
-        }
-        tmpbuf[0] = '\0';
-        for (i = 0; i < len; i++) {
-            if ((i % 4) == 0) {
-                strcat(tmpbuf, " ");
-            }
-            sprintf(tmpbuf + strlen(tmpbuf), " %02x", buf[b + i]);
-        }
-        trace_pl330_hexdump(b, tmpbuf);
+    g_autoptr(GString) str = g_string_sized_new(64);
+    size_t b, len;
+
+    for (b = 0; b < size; b += len) {
+        len = MIN(16, size - b);
+        g_string_truncate(str, 0);
+        qemu_hexdump_line(str, buf + b, len, 1, 4);
+        trace_pl330_hexdump(b, str->str);
     }
 }
 
diff --git a/hw/ide/atapi.c b/hw/ide/atapi.c
index 73ec373184..fcb6cca157 100644
--- a/hw/ide/atapi.c
+++ b/hw/ide/atapi.c
@@ -24,6 +24,7 @@
  */
 
 #include "qemu/osdep.h"
+#include "qemu/cutils.h"
 #include "hw/scsi/scsi.h"
 #include "sysemu/block-backend.h"
 #include "scsi/constants.h"
@@ -1309,14 +1310,9 @@ void ide_atapi_cmd(IDEState *s)
     trace_ide_atapi_cmd(s, s->io_buffer[0]);
 
     if (trace_event_get_state_backends(TRACE_IDE_ATAPI_CMD_PACKET)) {
-        /* Each pretty-printed byte needs two bytes and a space; */
-        char *ppacket = g_malloc(ATAPI_PACKET_SIZE * 3 + 1);
-        int i;
-        for (i = 0; i < ATAPI_PACKET_SIZE; i++) {
-            sprintf(ppacket + (i * 3), "%02x ", buf[i]);
-        }
-        trace_ide_atapi_cmd_packet(s, s->lcyl | (s->hcyl << 8), ppacket);
-        g_free(ppacket);
+        g_autoptr(GString) str =
+            qemu_hexdump_line(NULL, buf, ATAPI_PACKET_SIZE, 1, 0);
+        trace_ide_atapi_cmd_packet(s, s->lcyl | (s->hcyl << 8), str->str);
     }
 
     /*
diff --git a/hw/mips/malta.c b/hw/mips/malta.c
index af74008c82..664a2ae0a9 100644
--- a/hw/mips/malta.c
+++ b/hw/mips/malta.c
@@ -26,6 +26,7 @@
 #include "qemu/units.h"
 #include "qemu/bitops.h"
 #include "qemu/datadir.h"
+#include "qemu/cutils.h"
 #include "qemu/guest-random.h"
 #include "hw/clock.h"
 #include "hw/southbridge/piix.h"
@@ -850,15 +851,18 @@ static void G_GNUC_PRINTF(3, 4) prom_set(uint32_t *prom_buf, int index,
     va_end(ap);
 }
 
-static void reinitialize_rng_seed(void *opaque)
+static GString *rng_seed_hex_new(void)
 {
-    char *rng_seed_hex = opaque;
     uint8_t rng_seed[32];
 
     qemu_guest_getrandom_nofail(rng_seed, sizeof(rng_seed));
-    for (size_t i = 0; i < sizeof(rng_seed); ++i) {
-        sprintf(rng_seed_hex + i * 2, "%02x", rng_seed[i]);
-    }
+    return qemu_hexdump_line(NULL, rng_seed, sizeof(rng_seed), 0, 0);
+}
+
+static void reinitialize_rng_seed(void *opaque)
+{
+    g_autoptr(GString) hex = rng_seed_hex_new();
+    memcpy(opaque, hex->str, hex->len);
 }
 
 /* Kernel */
@@ -870,8 +874,6 @@ static uint64_t load_kernel(void)
     uint32_t *prom_buf;
     long prom_size;
     int prom_index = 0;
-    uint8_t rng_seed[32];
-    char rng_seed_hex[sizeof(rng_seed) * 2 + 1];
     size_t rng_seed_prom_offset;
 
     kernel_size = load_elf(loaderparams.kernel_filename, NULL,
@@ -946,14 +948,13 @@ static uint64_t load_kernel(void)
     prom_set(prom_buf, prom_index++, "modetty0");
     prom_set(prom_buf, prom_index++, "38400n8r");
 
-    qemu_guest_getrandom_nofail(rng_seed, sizeof(rng_seed));
-    for (size_t i = 0; i < sizeof(rng_seed); ++i) {
-        sprintf(rng_seed_hex + i * 2, "%02x", rng_seed[i]);
-    }
     prom_set(prom_buf, prom_index++, "rngseed");
     rng_seed_prom_offset = prom_index * ENVP_ENTRY_SIZE +
                            sizeof(uint32_t) * ENVP_NB_ENTRIES;
-    prom_set(prom_buf, prom_index++, "%s", rng_seed_hex);
+    {
+        g_autoptr(GString) hex = rng_seed_hex_new();
+        prom_set(prom_buf, prom_index++, "%s", hex->str);
+    }
 
     prom_set(prom_buf, prom_index++, NULL);
 
diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c
index 4bd7af9d0c..f386a2f01c 100644
--- a/hw/scsi/scsi-disk.c
+++ b/hw/scsi/scsi-disk.c
@@ -2648,19 +2648,12 @@ static const SCSIReqOps *const scsi_disk_reqops_dispatch[256] = {
 
 static void scsi_disk_new_request_dump(uint32_t lun, uint32_t tag, uint8_t *buf)
 {
-    int i;
     int len = scsi_cdb_length(buf);
-    char *line_buffer, *p;
+    g_autoptr(GString) str = NULL;
 
     assert(len > 0 && len <= 16);
-    line_buffer = g_malloc(len * 5 + 1);
-
-    for (i = 0, p = line_buffer; i < len; i++) {
-        p += sprintf(p, " 0x%02x", buf[i]);
-    }
-    trace_scsi_disk_new_request(lun, tag, line_buffer);
-
-    g_free(line_buffer);
+    str = qemu_hexdump_line(NULL, buf, len, 1, 0);
+    trace_scsi_disk_new_request(lun, tag, str->str);
 }
 
 static SCSIRequest *scsi_new_request(SCSIDevice *d, uint32_t tag, uint32_t lun,
diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
index 7368b71902..3cdaa12ed5 100644
--- a/hw/virtio/vhost-vdpa.c
+++ b/hw/virtio/vhost-vdpa.c
@@ -944,13 +944,15 @@ static int vhost_vdpa_set_config_call(struct vhost_dev *dev,
 static void vhost_vdpa_dump_config(struct vhost_dev *dev, const uint8_t *config,
                                    uint32_t config_len)
 {
-    int b, len;
-    char line[QEMU_HEXDUMP_LINE_LEN];
+    g_autoptr(GString) str = g_string_sized_new(4 * 16);
+    size_t b, len;
 
-    for (b = 0; b < config_len; b += 16) {
-        len = config_len - b;
-        qemu_hexdump_line(line, config + b, len);
-        trace_vhost_vdpa_dump_config(dev, b, line);
+    for (b = 0; b < config_len; b += len) {
+        len = MIN(config_len - b, 16);
+
+        g_string_truncate(str, 0);
+        qemu_hexdump_line(str, config + b, len, 1, 4);
+        trace_vhost_vdpa_dump_config(dev, b, str->str);
     }
 }