1 /****************************************************************************
2
3 GLUI User Interface Toolkit
4 ---------------------------
5
6 glui.cpp
7
8
9 --------------------------------------------------
10
11 Copyright (c) 1998 Paul Rademacher (this file, Bill Baxter 2005)
12
13 This software is provided 'as-is', without any express or implied
14 warranty. In no event will the authors be held liable for any damages
15 arising from the use of this software.
16
17 Permission is granted to anyone to use this software for any purpose,
18 including commercial applications, and to alter it and redistribute it
19 freely, subject to the following restrictions:
20
21 1. The origin of this software must not be misrepresented; you must not
22 claim that you wrote the original software. If you use this software
23 in a product, an acknowledgment in the product documentation would be
24 appreciated but is not required.
25 2. Altered source versions must be plainly marked as such, and must not be
26 misrepresented as being the original software.
27 3. This notice may not be removed or altered from any source distribution.
28
29 *****************************************************************************/
30
31 #include "GL/glui.h"
32 #include <stdarg.h>
33
34 #ifdef _MSC_VER
35 #define vsnprintf _vsnprintf
36 #endif
37
glui_format_str(GLUI_String & str,const char * fmt,...)38 GLUI_String& glui_format_str(GLUI_String& str, const char* fmt, ...)
39 {
40 const size_t ISIZE = 128;
41 char stackbuf[ISIZE];
42 size_t bufsz = ISIZE;
43 char *buf = stackbuf;
44 str = "";
45 va_list arg;
46 while (1) {
47 va_start(arg, fmt);
48 int ret = vsnprintf(buf,bufsz-1,fmt,arg);
49 va_end(arg);
50 if (ret>=0) {
51 break;
52 }
53 // else make a bigger buf, try again
54 bufsz <<= 1;
55 if (buf==stackbuf) buf = (char*)malloc(sizeof(char)*bufsz);
56 else buf = (char*)realloc(buf, sizeof(char)*bufsz);
57 }
58 if (buf!=stackbuf) free(buf);
59 str=buf;
60 return str;
61 }
62