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MINOR: tools: add dump_hex()

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This is used to dump a memory area into a buffer for debugging purposes.
This commit is contained in:
Willy Tarreau 2019-05-20 16:13:40 +02:00
parent da5a63f8f1
commit 9fc5dcbd71
2 changed files with 43 additions and 0 deletions
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1
include/common/standard.h
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@ -1423,6 +1423,7 @@ int dump_text(struct buffer *out, const char *buf, int bsize);
int dump_binary(struct buffer *out, const char *buf, int bsize); int dump_binary(struct buffer *out, const char *buf, int bsize);
int dump_text_line(struct buffer *out, const char *buf, int bsize, int len, int dump_text_line(struct buffer *out, const char *buf, int bsize, int len,
int *line, int ptr); int *line, int ptr);
void dump_hex(struct buffer *out, const char *pfx, const void *buf, int len);
/* same as realloc() except that ptr is also freed upon failure */ /* same as realloc() except that ptr is also freed upon failure */
static inline void *my_realloc2(void *ptr, size_t size) static inline void *my_realloc2(void *ptr, size_t size)

42
src/standard.c
View File

@ -4076,6 +4076,48 @@ int dump_binary(struct buffer *out, const char *buf, int bsize)
return ptr; return ptr;
} }
/* Appends into buffer <out> a hex dump of memory area <buf> for <len> bytes,
* prepending each line with prefix <pfx>. The output is *not* initialized.
* The output will not wrap pas the buffer's end so it is more optimal if the
* caller makes sure the buffer is aligned first. A trailing zero will always
* be appended (and not counted) if there is room for it. The caller must make
* sure that the area is dumpable first.
*/
void dump_hex(struct buffer *out, const char *pfx, const void *buf, int len)
{
const unsigned char *d = buf;
int i, j, start;
d = (const unsigned char *)(((unsigned long)buf) & -16);
start = ((unsigned long)buf) & 15;
for (i = 0; i < start + len; i += 16) {
chunk_appendf(out, (sizeof(void *) == 4) ? "%s%8p: " : "%s%16p: ", pfx, d + i);
for (j = 0; j < 16; j++) {
if ((i + j >= start) && (i + j < start + len))
chunk_appendf(out, "%02x ", d[i + j]);
else
chunk_strcat(out, "'' ");
if (j == 7)
chunk_strcat(out, "- ");
}
chunk_strcat(out, " ");
for (j = 0; j < 16; j++) {
if ((i + j >= start) && (i + j < start + len)) {
if (isprint(d[i + j]))
chunk_appendf(out, "%c", d[i + j]);
else
chunk_strcat(out, ".");
}
else
chunk_strcat(out, "'");
}
chunk_strcat(out, "\n");
}
}
/* print a line of text buffer (limited to 70 bytes) to <out>. The format is : /* print a line of text buffer (limited to 70 bytes) to <out>. The format is :
* <2 spaces> <offset=5 digits> <space or plus> <space> <70 chars max> <\n> * <2 spaces> <offset=5 digits> <space or plus> <space> <70 chars max> <\n>
* which is 60 chars per line. Non-printable chars \t, \n, \r and \e are * which is 60 chars per line. Non-printable chars \t, \n, \r and \e are