src/base/string/makef.c


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#include "internal.h"

// Newf returns a new dynamic string object
string
str·makef(const byte *fmt, ...)
{
    vlong  n;
    string s;
    va_list args;

    va_start(args, fmt);
    n = vsnprintf(nil, 0, fmt, args);
    va_end(args);

    s = str·makecap(nil, 0, n);

    va_start(args, fmt);
    vsnprintf(s, n + 1, fmt, args);
    va_end(args);

    Hdr* h = (Hdr*)(s - sizeof(Hdr));
    h->len = n;

    return s;
}