util: unify line caching and column caching

[elogind.git] / src / shared / util.h

diff --git a/src/shared/util.h b/src/shared/util.h
index 2429339f5bba3c3a46a1e521d902e3ceb1fc0a17..affb66998c1977c78b53bd8b142f2c2cf1b0bcc2 100644 (file)
--- a/src/shared/util.h
+++ b/src/shared/util.h
@@ -35,6 +35,7 @@
 #include <sys/stat.h>
 #include <dirent.h>
 #include <sys/resource.h>
+#include <stddef.h>
 
 #include "macro.h"
 
@@ -46,6 +47,12 @@ typedef struct dual_timestamp {
         usec_t monotonic;
 } dual_timestamp;
 
+union dirent_storage {
+        struct dirent de;
+        uint8_t storage[offsetof(struct dirent, d_name) +
+                        ((NAME_MAX + 1 + sizeof(long)) & ~(sizeof(long) - 1))];
+};
+
 #define MSEC_PER_SEC  1000ULL
 #define USEC_PER_SEC  1000000ULL
 #define USEC_PER_MSEC 1000ULL
@@ -104,13 +111,13 @@ size_t page_size(void);
 
 bool streq_ptr(const char *a, const char *b);
 
-#define new(t, n) ((t*) malloc(sizeof(t)*(n)))
+#define new(t, n) ((t*) malloc_multiply(sizeof(t), (n)))
 
 #define new0(t, n) ((t*) calloc((n), sizeof(t)))
 
 #define newa(t, n) ((t*) alloca(sizeof(t)*(n)))
 
-#define newdup(t, p, n) ((t*) memdup(p, sizeof(t)*(n)))
+#define newdup(t, p, n) ((t*) memdup_multiply(p, sizeof(t), (n)))
 
 #define malloc0(n) (calloc((n), 1))
 
@@ -377,10 +384,11 @@ int status_welcome(void);
 
 int fd_columns(int fd);
 unsigned columns(void);
-unsigned columns_uncached(void);
-
 int fd_lines(int fd);
 unsigned lines(void);
+void columns_lines_cache_reset(int _unused_ signum);
+
+bool on_tty(void);
 
 int running_in_chroot(void);
 
@@ -507,7 +515,7 @@ char *format_bytes(char *buf, size_t l, off_t t);
 
 int fd_wait_for_event(int fd, int event, usec_t timeout);
 
-void* memdup(const void *p, size_t l);
+void* memdup(const void *p, size_t l) _malloc_;
 
 int is_kernel_thread(pid_t pid);
 
@@ -536,3 +544,22 @@ void fclosep(FILE **f);
 void closep(int *fd);
 void closedirp(DIR **d);
 void umaskp(mode_t *u);
+
+_malloc_  static inline void *malloc_multiply(size_t a, size_t b) {
+        if (_unlikely_(b == 0 || a > ((size_t) -1) / b))
+                return NULL;
+
+        return malloc(a * b);
+}
+
+_malloc_ static inline void *memdup_multiply(const void *p, size_t a, size_t b) {
+        if (_unlikely_(b == 0 || a > ((size_t) -1) / b))
+                return NULL;
+
+        return memdup(p, a * b);
+}
+
+bool filename_is_safe(const char *p);
+bool string_is_safe(const char *p);
+
+int parse_timestamp(const char *t, usec_t *usec);