mirrors/weston
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

shared: add str_printf()

Browse Source 
asprintf() has the problem that it leaves *strp undefined when it
fails. Here is a simple wrapper that ensures NULL if asprintf() fails,
which is much more convenient to use.

This will be useful in future patches, where one needs to return error
messages from maybe failing functions, and more.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
This commit is contained in:
Pekka Paalanen 2021-05-28 14:40:00 +03:00 committed by Daniel Stone
parent 63fc73d1cc
commit bc3c37840c
1 changed files with 27 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
shared/string-helpers.h
View File

@ -31,6 +31,8 @@
#include <stdint.h>
#include <errno.h>
#include <assert.h>
#include <stdarg.h>
#include <stdio.h>
/* Convert string to integer
*
@ -68,4 +70,29 @@ safe_strtoint(const char *str, int32_t *value)
return true;
}
/**
* Exactly like asprintf(), but sets *str_out to NULL if it fails.
*
* If str_out is NULL, does nothing.
*/
static inline void __attribute__ ((format (printf, 2, 3)))
str_printf(char **str_out, const char *fmt, ...)
{
char *msg;
va_list ap;
int ret;
if (!str_out)
return;
va_start(ap, fmt);
ret = vasprintf(&msg, fmt, ap);
va_end(ap);
if (ret >= 0)
*str_out = msg;
else
*str_out = NULL;
}
#endif /* WESTON_STRING_HELPERS_H */