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24 lines
596 B
C
24 lines
596 B
C
// Copyright (c) 2019 Christoffer Lerno. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include <stdarg.h>
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#include <stddef.h>
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#include <assert.h>
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#include "lib.h"
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#include "stdio.h"
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char *strformat(const char *var, ...)
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{
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va_list list;
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va_start(list, var);
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int len = vsnprintf(NULL, 0, var, list);
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va_end(list);
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if (len == 0) return "";
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va_start(list, var);
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char *buffer = malloc_arena(len + 1);
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int new_len = vsnprintf(buffer, len + 1, var, list);
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va_end(list);
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assert(len == new_len);
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return buffer;
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} |