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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "stringfmt.h"
#include <cassert>
namespace vespalib {
//-----------------------------------------------------------------------------
vespalib::string make_string_va(const char *fmt, va_list ap)
{
va_list ap2;
vespalib::string ret;
int size = -1;
va_copy(ap2, ap);
size = vsnprintf(ret.begin(), ret.capacity(), fmt, ap2);
va_end(ap2);
assert(size >= 0);
if (ret.capacity() > static_cast<size_t>(size)) {
// all OK
} else {
int newLen = size;
ret.reserve(size+1);
va_copy(ap2, ap);
size = vsnprintf(ret.begin(), ret.capacity(), fmt, ap2);
va_end(ap2);
assert(newLen == size);
(void)newLen;
}
ret.append_from_reserved(size);
return ret;
}
/**
* @brief construct string value printf style.
*
* You must \#include <vespa/vespalib/util/stringfmt.h>
* to use this utility function.
* @param fmt format string
* @return formatted vespalib::string
**/
vespalib::string make_string(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vespalib::string ret = make_string_va(fmt, ap);
va_end(ap);
return ret;
}
namespace make_string_short {
vespalib::string fmt(const char *format, ...)
{
va_list ap;
va_start(ap, format);
vespalib::string ret = make_string_va(format, ap);
va_end(ap);
return ret;
}
} // namespace vespalib::make_string_short
} // namespace vespalib
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