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nhttpd/yhttpd_core/helper.cpp: avoid buffer overload

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Origin commit data
------------------
Commit: 7ebd9f8fdf
Author: Jacek Jendrzej <overx300@gmail.com>
Date: 2016-02-19 (Fri, 19 Feb 2016)
This commit is contained in:
Jacek Jendrzej
2016-02-19 15:15:46 +01:00
parent c8ac0e8670
commit caee20b1ad
1 changed files with 9 additions and 2 deletions
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11
src/nhttpd/yhttpd_core/helper.cpp
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@@ -76,10 +76,17 @@ std::string timeString(time_t time) {
// Printf and return formatet String. Buffer-save! // Printf and return formatet String. Buffer-save!
// max length up to bufferlen -> then snip // max length up to bufferlen -> then snip
//------------------------------------------------------------------------- //-------------------------------------------------------------------------
#define bufferlen 4*1024
std::string string_printf(const char *fmt, ...) { std::string string_printf(const char *fmt, ...) {
char buffer[bufferlen];
va_list arglist; va_list arglist;
va_start (arglist, fmt);
int len = vsnprintf (NULL, 0, fmt, arglist);
va_end (arglist);
const int bufferlen = 4*1024;
if(len >= bufferlen){
printf("string_printf: error: buffer overflow : len %i line %i\n",len,__LINE__);
return "error";
}
char buffer[bufferlen] = {0};
va_start(arglist, fmt); va_start(arglist, fmt);
vsnprintf(buffer, bufferlen, fmt, arglist); vsnprintf(buffer, bufferlen, fmt, arglist);
va_end(arglist); va_end(arglist);