1 #include <stdio.h>
2 #include <stdint.h>
3 #include <stdarg.h>
4
5 #if defined(__GNUC__)
6 #endif
7
8 #if defined(_MSC_VER)
9 #define snprintf(buf,size,fmt,...) sprintf_s(buf,size,fmt,__VA_ARGS__)
10 #define vsnprintf(buf,size,fmt,...) vsprintf_s(buf,size,fmt,__VA_ARGS__)
11 #endif
12
13 #define STRAPPEND(buf, size, offset, fmt, ...) do { \
14 if (offset < size) \
15 { \
16 offset += snprintf(buf + offset, size - offset, fmt, __VA_ARGS__); \
17 }\
18 }while (0)
19
20
21 inline void StrAppend(char buf[], const uint32_t bufLen, uint32_t &offset, const char *fmt, ...)
22 {
23 va_list argptr;
24 va_start(argptr, fmt);
25 if (offset < bufLen)
26 {
27 offset += vsnprintf(buf + offset, bufLen - offset, fmt, argptr);
28 }
29 va_end(argptr);
30 }
31
32 int32_t main(int32_t argc, char *argv[])
33 {
34 char buf[64] = { 0 };
35 uint32_t offset = 0;
36 StrAppend(buf, 64, offset, "%d ", 12);
37 StrAppend(buf, 64, offset, ",%s--", "qwe");
38 StrAppend(buf, 64, offset, ",%0.2f!!!", 1.0);
39 printf("%s\n", buf);
40 offset = 0;
41 STRAPPEND(buf, 64, offset, "%d ", 121);
42 STRAPPEND(buf, 64, offset, ",%s--", "qwe1");
43 STRAPPEND(buf, 64, offset, ",%0.3f!!!", 11.0);
44 printf("%s\n", buf);
45 return 0;
46 }
