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lib: fixup zlog_hexdump

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* Allocate correct amount of memory
* Use snprintf() instead of sprintf()

Signed-off-by: Quentin Young <qlyoung@cumulusnetworks.com>
This commit is contained in:
Quentin Young 2018-03-12 14:01:47 -04:00
parent 9d16566bb3
commit 2cf63c3561
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GPG Key ID: DAF48E0F57E0834F
1 changed files with 23 additions and 16 deletions
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39
lib/log.c
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@ -1092,41 +1092,48 @@ void zlog_hexdump(const void *mem, unsigned int len)
unsigned long i = 0;
unsigned int j = 0;
unsigned int columns = 8;
char buf[(len * 4) + ((len / 4) * 20) + 30];
/* 19 bytes for 0xADDRESS: */
/* 24 bytes for data; 2 chars plus a space per data byte */
/* 1 byte for space */
/* 8 bytes for ASCII representation */
/* 1 byte for a newline */
/* ===================== */
/* 53 bytes per 8 bytes of data */
/* 1 byte for null term */
size_t bs = ((len / 8) + 1) * 53 + 1;
char buf[bs];
char *s = buf;
for (i = 0; i < len + ((len % columns) ? (columns - len % columns) : 0);
i++) {
/* print offset */
if (i % columns == 0)
s += sprintf(s, "0x%016lx: ", (unsigned long)mem + i);
s += snprintf(s, bs - (s - buf),
"0x%016lx: ", (unsigned long)mem + i);
/* print hex data */
if (i < len)
s += sprintf(s, "%02x ", 0xFF & ((const char *)mem)[i]);
s += snprintf(s, bs - (s - buf), "%02x ",
0xFF & ((const char *)mem)[i]);
/* end of block, just aligning for ASCII dump */
else
s += sprintf(s, " ");
s += snprintf(s, bs - (s - buf), " ");
/* print ASCII dump */
if (i % columns == (columns - 1)) {
for (j = i - (columns - 1); j <= i; j++) {
if (j >= len) /* end of block, not really
printing */
s += sprintf(s, " ");
else if (isprint((int)((const char *)mem)
[j])) /* printable char
*/
s += sprintf(
s, "%c",
/* end of block not really printing */
if (j >= len)
s += snprintf(s, bs - (s - buf), " ");
else if (isprint((int)((const char *)mem)[j]))
s += snprintf(
s, bs - (s - buf), "%c",
0xFF & ((const char *)mem)[j]);
else /* other char */
s += sprintf(s, ".");
s += snprintf(s, bs - (s - buf), ".");
}
s += sprintf(s, "\n");
s += snprintf(s, bs - (s - buf), "\n");
}
}
zlog_debug("\n%s", buf);