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shared: support empty blobs in nm_utils_bin2hexstr_full()

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The limitation to not accept a length of 0 is easy to forget.

Handle also empty blobs in a sensible way, by returning the
empty word.
This commit is contained in:
Thomas Haller 2019-02-21 12:03:29 +01:00
parent 53b747fff5
commit 9d0da3e60b
1 changed files with 17 additions and 15 deletions
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32
shared/nm-utils/nm-shared-utils.c
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@ -2538,8 +2538,10 @@ nm_utils_memeqzero (gconstpointer data, gsize length)
/**
* nm_utils_bin2hexstr_full:
* @addr: pointer of @length bytes.
* @length: number of bytes in @addr
* @addr: pointer of @length bytes. If @length is zero, this may
* also be %NULL.
* @length: number of bytes in @addr. May also be zero, in which
* case this will return an empty string.
* @delimiter: either '\0', otherwise the output string will have the
* given delimiter character between each two hex numbers.
* @upper_case: if TRUE, use upper case ASCII characters for hex.
@ -2565,9 +2567,6 @@ nm_utils_bin2hexstr_full (gconstpointer addr,
const char *LOOKUP = upper_case ? "0123456789ABCDEF" : "0123456789abcdef";
char *out0;
nm_assert (addr);
nm_assert (length > 0);
if (out)
out0 = out;
else {
@ -2579,19 +2578,22 @@ nm_utils_bin2hexstr_full (gconstpointer addr,
/* @out must contain at least @length*3 bytes if @delimiter is set,
* otherwise, @length*2+1. */
for (;;) {
const guint8 v = *in++;
if (length > 0) {
nm_assert (in);
for (;;) {
const guint8 v = *in++;
*out++ = LOOKUP[v >> 4];
*out++ = LOOKUP[v & 0x0F];
length--;
if (!length)
break;
if (delimiter)
*out++ = delimiter;
*out++ = LOOKUP[v >> 4];
*out++ = LOOKUP[v & 0x0F];
length--;
if (!length)
break;
if (delimiter)
*out++ = delimiter;
}
}
*out = 0;
*out = '\0';
return out0;
}