78 lines
1.7 KiB
C++
78 lines
1.7 KiB
C++
/*
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* Copyright (c) 2016 Andrew Kelley
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*
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* This file is part of zig, which is MIT licensed.
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* See http://opensource.org/licenses/MIT
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*/
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#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_vprintf(const char *format, va_list ap) {
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va_list ap2;
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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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return buf;
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}
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Buf *buf_sprintf(const char *format, ...) {
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va_list ap;
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va_start(ap, format);
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Buf *result = buf_vprintf(format, ap);
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va_end(ap);
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return result;
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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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size_t 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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// these functions are not static inline so they can be better used as template parameters
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bool buf_eql_buf(Buf *buf, Buf *other) {
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assert(buf->list.length);
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return buf_eql_mem(buf, buf_ptr(other), buf_len(other));
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}
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uint32_t buf_hash(Buf *buf) {
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assert(buf->list.length);
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// FNV 32-bit hash
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uint32_t h = 2166136261;
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for (size_t i = 0; i < buf_len(buf); i += 1) {
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h = h ^ ((uint8_t)buf->list.at(i));
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h = h * 16777619;
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}
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return h;
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}
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