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macros.h: Make FLAC_CHECK_RETURN print to stderr 

Also comment the fact that this macro should only be used for things
that are extremely unlikely to fail.
This commit is contained in:
Erik de Castro Lopo 2016-01-19 18:16:26 +11:00
parent cc55e65182
commit 293d6b22cd
1 changed files with 6 additions and 2 deletions
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8
include/share/macros.h
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@ -32,10 +32,14 @@
#include <errno.h>
/* FLAC_CHECK_RETURN : Check the return value of the provided function and
* print and error message if it fails (ie returns a value < 0).
* print an error message if it fails (ie returns a value < 0).
*
* Ideally, a library should not print anything, but this macro is only used
* for things that extremely unlikely to fail, like `chown` to a previoulsy
* saved `uid`.
*/
#define FLAC_CHECK_RETURN(x) \
{ if ((x) < 0) \
printf ("%s : %s\n", #x, strerror (errno)) ; \
fprintf (stderr, "%s : %s\n", #x, strerror (errno)) ; \
}