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glib-aux: add nmtst_assert_cmpmem() helper

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g_assert_cmpmem() exists, but it does not print the actual buffer
content on test failure.  It is useful to see what actually failed in
the test output.

Also, nmtst_assert_cmpmem() prints a backslash escaped output, that you
can unescape in the terminal with `echo -e`. You can also directly copy
and paste the output to C source code.

(cherry picked from commit 3c3938406d)
This commit is contained in:
Thomas Haller 2023-05-10 08:41:00 +02:00 • committed by Fernando Fernandez Mancera
parent 18848c77c7
commit 4ec00efca9
1 changed files with 48 additions and 0 deletions
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48
src/libnm-glib-aux/nm-test-utils.h
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@ -203,6 +203,54 @@
} \
G_STMT_END
#define nmtst_assert_cmpmem(m1, l1, m2, l2) \
G_STMT_START \
{ \
const guint8 *const _m1 = (gpointer) (m1); \
const guint8 *const _m2 = (gpointer) (m2); \
const gsize _l1 = (l1); \
const gsize _l2 = (l2); \
\
/* This is like g_assert_cmpmem(), however on failure it actually
* prints the compared buffer contents, which is useful for debugging
* the test failure. */ \
\
g_assert(_l1 == 0 || _m1); \
g_assert(_l2 == 0 || _m2); \
\
if (_l1 != _l2 || (_l1 > 0 && memcmp(_m1, _m2, _l1) != 0)) { \
gs_free char *_s1 = NULL; \
gs_free char *_s2 = NULL; \
\
g_error( \
"ERROR: %s:%d : buffer [\"%s\" (%s, %zu bytes)] differs from [\"%s\" (%s, %zu " \
"bytes)]:\n" \
" a=[ \"%s\" ]\n" \
" b=[ \"%s\" ]\n", \
__FILE__, \
(int) __LINE__, \
#m1, \
#l1, \
_l1, \
#m2, \
#l2, \
_l2, \
(_s1 = nm_utils_buf_utf8safe_escape_cp( \
_m1, \
_l1, \
NM_UTILS_STR_UTF8_SAFE_FLAG_ESCAPE_CTRL \
| NM_UTILS_STR_UTF8_SAFE_FLAG_ESCAPE_DOUBLE_QUOTE)) \
?: "", \
(_s2 = nm_utils_buf_utf8safe_escape_cp( \
_m2, \
_l2, \
NM_UTILS_STR_UTF8_SAFE_FLAG_ESCAPE_CTRL \
| NM_UTILS_STR_UTF8_SAFE_FLAG_ESCAPE_DOUBLE_QUOTE)) \
?: ""); \
} \
} \
G_STMT_END
/*****************************************************************************/
/* Our nm-error error numbers use negative values to signal failure.