PengZheng commented on issue #471:
URL: https://github.com/apache/celix/issues/471#issuecomment-1396916768
For MacOS, I found `va_list` something like this:
```C
typedef struct {
char gpr; /* index into the array of 8 GPRs stored in the
register save area gpr=0 corresponds to r3,
gpr=1 to r4, etc. */
char fpr; /* index into the array of 8 FPRs stored in the
register save area fpr=0 corresponds to f1,
fpr=1 to f2, etc. */
char *overflow_arg_area; /* location on stack that holds the next
overflow argument */
char *reg_save_area; /* where r3:r10 and f1:f8, if saved are
stored */
} __va_list[1];
#elif defined(_HIDDEN_VA_LIST) && defined(_VA_LIST)
#undef _HIDDEN_VA_LIST
typedef __va_list va_list;
```
https://opensource.apple.com/source/xnu/xnu-201/osfmk/libsa/ppc/va_list.h.auto.html
Then the following seems buggy:
```C
char buffer[1024];
size_t needed = vsnprintf(buffer, 1024, format, formatArgs);
//formatArgs is modified HERE
if (needed > 1024) {
char *allocatedBuffer = NULL;
vasprintf(&allocatedBuffer, format, formatArgs); //formatArgs is
used again
syslog(sysLogLvl, "[%s]: %s", logServiceName, allocatedBuffer);
free(allocatedBuffer);
} else {
syslog(sysLogLvl, "[%s]: %s", logServiceName, buffer);
}
```
We may need a `va_copy` here. I'll give it a try.
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