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shared: add nm_strndup_a() helper

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(cherry picked from commit ba491a6674)
This commit is contained in:
Thomas Haller 2018-09-21 15:45:59 +02:00
parent a1831d1832
commit 2c685fc3e0
1 changed files with 31 additions and 0 deletions
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31
shared/nm-utils/nm-shared-utils.h
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@ -262,6 +262,37 @@ nm_memdup (gconstpointer data, gsize size)
return p;
}
/* Similar to g_strndup(), however, if the string (including the terminating
* NUL char) fits into alloca_maxlen, this will alloca() the memory.
*
* It's a mix of strndup() and strndupa(), but deciding based on @alloca_maxlen
* which one to use.
*
* In case malloc() is necessary, @out_str_free will be set (this string
* must be freed afterwards). It is permissible to pass %NULL as @out_str_free,
* if you ensure that len < alloca_maxlen. */
#define nm_strndup_a(alloca_maxlen, str, len, out_str_free) \
({ \
const gsize _alloca_maxlen = (alloca_maxlen); \
const char *const _str = (str); \
const gsize _len = (len); \
char **const _out_str_free = (out_str_free); \
char *_s; \
\
if ( _out_str_free \
&& _len >= _alloca_maxlen) { \
_s = g_malloc (_len + 1); \
*_out_str_free = _s; \
} else { \
g_assert (_len < _alloca_maxlen); \
_s = g_alloca (_len + 1); \
} \
if (_len > 0) \
strncpy (_s, _str, _len); \
_s[_len] = '\0'; \
_s; \
})
/*****************************************************************************/
extern const void *const _NM_PTRARRAY_EMPTY[1];