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