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internal: Add STRLIM macro for checking string length using strnlen()

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As a microoprimization when checking whether length of a string fits
into a limit we don't necessarily need to calculate the full length but
can use strnlen to check only LIMIT+1 chars. Add a macro which will
simplify the expressions.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Peter Krempa 2021-11-24 17:03:07 +01:00
parent 9220413480
commit 8eb7471eb3
1 changed files with 9 additions and 0 deletions
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9
src/internal.h
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@ -87,6 +87,15 @@
#define STRPREFIX(a, b) (strncmp(a, b, strlen(b)) == 0) #define STRPREFIX(a, b) (strncmp(a, b, strlen(b)) == 0)
#define STRCASEPREFIX(a, b) (g_ascii_strncasecmp(a, b, strlen(b)) == 0) #define STRCASEPREFIX(a, b) (g_ascii_strncasecmp(a, b, strlen(b)) == 0)
#define STRSKIP(a, b) (STRPREFIX(a, b) ? (a) + strlen(b) : NULL) #define STRSKIP(a, b) (STRPREFIX(a, b) ? (a) + strlen(b) : NULL)
/**
* STRLIM
* @str: pointer to a string (evaluated once)
* @lim: length limit (evaluated twice)
*
* Evaluates as true if length of @str doesn't exceed the limit @lim. Note
* that @lim + 1 characters may be accessed.
*/
#define STRLIM(str, lim) (strnlen((str), (lim) + 1) <= (lim))
#define STREQ_NULLABLE(a, b) (g_strcmp0(a, b) == 0) #define STREQ_NULLABLE(a, b) (g_strcmp0(a, b) == 0)
#define STRNEQ_NULLABLE(a, b) (g_strcmp0(a, b) != 0) #define STRNEQ_NULLABLE(a, b) (g_strcmp0(a, b) != 0)