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README.Coding: PRINT format specifiers PRIuxx

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Signed-off-by: Pavel Filipenský <pfilipensky@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
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Pavel Filipenský 2022-07-19 11:46:13 +02:00 committed by Andreas Schneider
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commit e01b9f11ad
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README.Coding.md
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@ -555,3 +555,26 @@ DBG_DEBUG("Received %d bytes\n", count);
The messages from these macros are automatically prefixed with the The messages from these macros are automatically prefixed with the
function name. function name.
### PRINT format specifiers PRIuxx
Use %PRIu32 instead of %u for uint32_t. Do not assume that this is valid:
/usr/include/inttypes.h
104:# define PRIu32 "u"
It could be possible to have a platform where "unsigned" is 64-bit. In theory
even 16-bit. The point is that "unsigned" being 32-bit is nowhere specified.
The PRIuxx specifiers are standard.
Example usage:
```
D_DEBUG("Resolving %"PRIu32" SID(s).\n", state->num_sids);
```
Note:
Do not use PRIu32 for uid_t and gid_t, they do not have to be uint32_t.