/home/ptr/dev/dev-libs/libsex/libsex/utility.cxx

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/**
 * @file
 *
 * Non-template definitions of formatting-related internal
 * functions.
 */

#include <libsex/utility.hxx>
#include <cassert>

bool libsex::vformat(
        char* const buf,
        size_t len,
        const char* const file,
        unsigned short line,
        const char* const msg,
        va_list ap) throw()
{
        size_t chars = snprintf(buf, len, "%s:%d: ", file, line);

        // If buffer was too small, chars contains length
        // of chars that would've been written. Chars must
        // be lower than length or else we could not fit
        // the message into buffer, too.
        bool didFitIntoBuffer = chars < len;

        if (didFitIntoBuffer) {
                size_t      newLength = len - chars;
                char* const newBuffer = buf + chars;
                chars = vsnprintf(newBuffer, newLength, msg, ap);
                didFitIntoBuffer = chars <= newLength;
        }

        return didFitIntoBuffer;
}

bool libsex::format(
        char* const buf,
        size_t len,
        const char* const file,
        unsigned short line,
        const char* const msg,
        ...) throw()
{
        va_list ap;
        va_start(ap, msg);

        bool result = vformat(buf, len, file, line, msg, ap);

        va_end(ap);
        return result;
}