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-rw-r--r--src/util.h29
1 files changed, 17 insertions, 12 deletions
diff --git a/src/util.h b/src/util.h
index 1c7d8a6..c1f8934 100644
--- a/src/util.h
+++ b/src/util.h
@@ -19,6 +19,16 @@
+#ifndef GCC_ONLY
+# if defined(__GNUC__) && !defined(__clang__)
+# define GCC_ONLY(...) __VA_ARGS__
+# else
+# define GCC_ONLY(...) /* nothing */
+# endif
+#endif
+
+
+
/**
* Duplicate a memory segment
*
@@ -27,8 +37,8 @@
* @return The duplicate of the memory segment,
* `NULL` on error
*/
-void* memdup(const void* src, size_t n);
-
+GCC_ONLY(__attribute__((malloc, nonnull)))
+void* memdup(const void* restrict src, size_t n);
/**
* Read an entire file
@@ -40,8 +50,8 @@ void* memdup(const void* src, size_t n);
* @return The read content, plus a NUL byte at
* the end (not counted in `*n`)
*/
-void* nread(int fd, size_t* n);
-
+GCC_ONLY(__attribute__((malloc)))
+void* nread(int fd, size_t* restrict n);
/**
* Write an entire buffer to a file
@@ -54,8 +64,7 @@ void* nread(int fd, size_t* n);
* @return The number of written bytes, less than `n`
* on error, cannot exceed `n`
*/
-size_t nwrite(int fd, const void* buf, size_t n);
-
+size_t nwrite(int fd, const void* restrict buf, size_t n);
/**
* Duplicate a file descriptor an make sure
@@ -68,7 +77,6 @@ size_t nwrite(int fd, const void* buf, size_t n);
*/
int dup2atleast(int fd, int atleast);
-
/**
* Perform a timed suspention of the process.
* The process resumes when the timer expires,
@@ -79,7 +87,6 @@ int dup2atleast(int fd, int atleast);
*/
void msleep(int ms);
-
/**
* Check whether a NUL-terminated string is encoded in UTF-8
*
@@ -87,8 +94,6 @@ void msleep(int ms);
* @param allow_modified_nul Whether Modified UTF-8 is allowed, which allows a two-byte encoding for NUL
* @return Zero if good, -1 on encoding error
*/
-#if defined(__GNUC__)
-__attribute__((pure))
-#endif
-int verify_utf8(const char* string, int allow_modified_nul);
+GCC_ONLY(__attribute__((pure, nonnull)))
+int verify_utf8(const char* restrict string, int allow_modified_nul);