1 #ifndef _UTILS_H
2 #define _UTILS_H
3 #include <stdbool.h>
4 #include <string.h>
5 #include <stdint.h>
6 #include <stdio.h>
7
8 #include <xen-tools/common-macros.h>
9
10 #include "xenstore_lib.h"
11
12 /* Is A == B ? */
13 #define streq(a,b) (strcmp((a),(b)) == 0)
14
15 /* Does A start with B ? */
16 #define strstarts(a,b) (strncmp((a),(b),strlen(b)) == 0)
17
18 /* Does A end in B ? */
strends(const char * a,const char * b)19 static inline bool strends(const char *a, const char *b)
20 {
21 if (strlen(a) < strlen(b))
22 return false;
23
24 return streq(a + strlen(a) - strlen(b), b);
25 }
26
27 /*
28 * Write NUL bytes for aligning state data to 8 bytes.
29 */
30 const char *dump_state_align(FILE *fp);
31
32 #define PRINTF_ATTRIBUTE(a1, a2) __attribute__((format (printf, a1, a2)))
33
34 #define __noreturn __attribute__((noreturn))
35
36 void barf(const char *fmt, ...) __noreturn PRINTF_ATTRIBUTE(1, 2);
37 void barf_perror(const char *fmt, ...) __noreturn PRINTF_ATTRIBUTE(1, 2);
38
39 /* Function pointer as xprintf() can be configured at runtime. */
40 extern void (*xprintf)(const char *fmt, ...) PRINTF_ATTRIBUTE(1, 2);
41
42 #define eprintf(_fmt, _args...) xprintf("[ERR] %s" _fmt, __FUNCTION__, ##_args)
43
44 /*
45 * Mux errno values onto returned pointers.
46 */
47
ERR_PTR(long error)48 static inline void *ERR_PTR(long error)
49 {
50 return (void *)error;
51 }
52
PTR_ERR(const void * ptr)53 static inline long PTR_ERR(const void *ptr)
54 {
55 return (long)ptr;
56 }
57
IS_ERR(const void * ptr)58 static inline long IS_ERR(const void *ptr)
59 {
60 return ((unsigned long)ptr > (unsigned long)-1000L);
61 }
62
63
64 #endif /* _UTILS_H */
65
66 /*
67 * Local variables:
68 * mode: C
69 * c-file-style: "linux"
70 * indent-tabs-mode: t
71 * c-basic-offset: 8
72 * tab-width: 8
73 * End:
74 */
75