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#include "buffer.hpp"
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
Buf *buf_sprintf(const char *format, ...) {
va_list ap, ap2;
va_start(ap, format);
va_copy(ap2, ap);
int len1 = vsnprintf(nullptr, 0, format, ap);
assert(len1 >= 0);
size_t required_size = len1 + 1;
Buf *buf = buf_alloc_fixed(len1);
int len2 = vsnprintf(buf_ptr(buf), required_size, format, ap2);
assert(len2 == len1);
va_end(ap2);
va_end(ap);
return buf;
}
void buf_appendf(Buf *buf, const char *format, ...) {
va_list ap, ap2;
va_start(ap, format);
va_copy(ap2, ap);
int len1 = vsnprintf(nullptr, 0, format, ap);
assert(len1 >= 0);
size_t required_size = len1 + 1;
int orig_len = buf_len(buf);
buf_resize(buf, orig_len + len1);
int len2 = vsnprintf(buf_ptr(buf) + orig_len, required_size, format, ap2);
assert(len2 == len1);
va_end(ap2);
va_end(ap);
}
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