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* HACKING (Programming tips): added a tip concerning the NULL

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pointer in varargs function calls.
This commit is contained in:
Roland Illig 2004-09-24 14:19:21 +00:00
parent ad1e412fa1
commit df14f4860c
2 changed files with 15 additions and 1 deletions
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ChangeLog
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@ -1,3 +1,8 @@
2004-09-24 Roland Illig <roland.illig@gmx.de>
* HACKING (Programming tips): added a tip concerning the NULL
pointer in varargs function calls.
2004-09-22 Roland Illig <roland.illig@gmx.de>
* HACKING: added advice for using g_strdup for a modifiable

11
HACKING
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@ -331,7 +331,7 @@ g_free: g_free handles NULL argument too, no need for the comparison.
Right way:
g_free (old_dir);
g_strdup: If you use g_strdup to create a local copy of a string, use
g_strdup: When you use g_strdup to create a local copy of a string, use
the following pattern to keep the reference.
char * const pathref = g_strdup(argument);
@ -345,6 +345,15 @@ g_strlcpy: Whenever you use this function, be sure to add "glibcompat.h"
to the included headers. This is because in glib-1.2 there is
no such function.
NULL: When you pass NULL as an argument of a varargs function, cast the
NULL to the appropriate data type. If a system #defines NULL to
be 0 (at least NetBSD and OpenBSD do), and the sizes of int and
a pointer are different, the argument will be passed as int 0,
not as a pointer.
example:
char *path = g_strconcat("dir", "/", "file", (char *) NULL);
size_t: This data type is suitable for expressing sizes of memory or the
length of strings. This type is unsigned, so you need not check
if the value is >= 0.