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stb_sprintf: fix size-only snprintf query

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This commit is contained in:
Sean Barrett 2018-01-30 05:29:31 -08:00
parent ccee11ad79
commit 01daa3a244
1 changed files with 31 additions and 12 deletions
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43
stb_sprintf.h
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@ -1,4 +1,4 @@
// stb_sprintf - v1.04 - public domain snprintf() implementation
// stb_sprintf - v1.05 - public domain snprintf() implementation
// originally by Jeff Roberts / RAD Game Tools, 2015/10/20
// http://github.com/nothings/stb
//
@ -14,6 +14,7 @@
// Jari Komppa (SI suffixes)
// Rohit Nirmal
// Marcin Wojdyr
// Leonard Ritter
//
// LICENSE:
//
@ -1343,24 +1344,42 @@ static char *stbsp__clamp_callback(char *buf, void *user, int len)
return (c->count >= STB_SPRINTF_MIN) ? c->buf : c->tmp; // go direct into buffer if you can
}
STBSP__PUBLICDEF int STB_SPRINTF_DECORATE(vsnprintf)(char *buf, int count, char const *fmt, va_list va)
static char * stbsp__count_clamp_callback( char * buf, void * user, int len )
{
stbsp__context * c = (stbsp__context*)user;
c->count += len;
return c->tmp; // go direct into buffer if you can
}
STBSP__PUBLICDEF int STB_SPRINTF_DECORATE( vsnprintf )( char * buf, int count, char const * fmt, va_list va )
{
stbsp__context c;
int l;
if (count == 0)
return 0;
if ( (count == 0) && !buf )
{
c.count = 0;
c.buf = buf;
c.count = count;
STB_SPRINTF_DECORATE( vsprintfcb )( stbsp__count_clamp_callback, &c, c.tmp, fmt, va );
l = c.count;
}
else
{
if ( count == 0 )
return 0;
STB_SPRINTF_DECORATE(vsprintfcb)(stbsp__clamp_callback, &c, stbsp__clamp_callback(0, &c, 0), fmt, va);
c.buf = buf;
c.count = count;
// zero-terminate
l = (int)(c.buf - buf);
if (l >= count) // should never be greater, only equal (or less) than count
l = count - 1;
buf[l] = 0;
STB_SPRINTF_DECORATE( vsprintfcb )( stbsp__clamp_callback, &c, stbsp__clamp_callback(0,&c,0), fmt, va );
// zero-terminate
l = (int)( c.buf - buf );
if ( l >= count ) // should never be greater, only equal (or less) than count
l = count - 1;
buf[l] = 0;
}
return l;
}