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basic: nicer xsprintf and xstrftime assert messages

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It's nicer if the assertion failure message from a bad use of xsprintf
actually mentions xsprintf instead of the expression the macro is
implemented as.

The assert_message_se macro was added in the previous commit as an
internal helper, but it can also be used for customizing assertion
failure messages like in this case.

Example:
  char buf[10];
  xsprintf(buf, "This is a %s message.\n", "long");

Before:
  Assertion '(size_t) snprintf(buf, ELEMENTSOF(buf), "This is a %s
  message.\n", "long") < ELEMENTSOF(buf)' failed at foo.c:6, function
  main(). Aborting.

After:
  Assertion 'xsprintf: buf[] must be big enough' failed at foo.c:6,
  function main(). Aborting.
This commit is contained in:
Michal Schmidt 2015-09-14 15:53:47 +02:00
parent 34c38d2aaa
commit a8b626100b
2 changed files with 6 additions and 2 deletions
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4
src/basic/time-util.h
View File

@ -112,6 +112,8 @@ bool timezone_is_valid(const char *name);
clockid_t clock_boottime_or_monotonic(void);
#define xstrftime(buf, fmt, tm) assert_se(strftime(buf, ELEMENTSOF(buf), fmt, tm) > 0)
#define xstrftime(buf, fmt, tm) \
assert_message_se(strftime(buf, ELEMENTSOF(buf), fmt, tm) > 0, \
"xstrftime: " #buf "[] must be big enough")
int get_timezone(char **timezone);

4
src/basic/util.h
View File

@ -374,7 +374,9 @@ DEFINE_TRIVIAL_CLEANUP_FUNC(cpu_set_t*, CPU_FREE);
cpu_set_t* cpu_set_malloc(unsigned *ncpus);
#define xsprintf(buf, fmt, ...) assert_se((size_t) snprintf(buf, ELEMENTSOF(buf), fmt, __VA_ARGS__) < ELEMENTSOF(buf))
#define xsprintf(buf, fmt, ...) \
assert_message_se((size_t) snprintf(buf, ELEMENTSOF(buf), fmt, __VA_ARGS__) < ELEMENTSOF(buf), \
"xsprintf: " #buf "[] must be big enough")
int files_same(const char *filea, const char *fileb);