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buffer.cpp
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80 lines (62 loc) · 1.78 KB
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/*
* Copyright (c) 2016 Andrew Kelley
*
* This file is part of zig, which is MIT licensed.
* See http://opensource.org/licenses/MIT
*/
#include "buffer.hpp"
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
Buf *buf_vprintf(const char *format, va_list ap) {
va_list ap2;
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);
return buf;
}
Buf *buf_sprintf(const char *format, ...) {
va_list ap;
va_start(ap, format);
Buf *result = buf_vprintf(format, ap);
va_end(ap);
return result;
}
void buf_appendf(Buf *buf, const char *format, ...) {
assert(buf->list.length);
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;
size_t 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);
}
// these functions are not static inline so they can be better used as template parameters
bool buf_eql_buf(Buf *buf, Buf *other) {
assert(buf->list.length);
return buf_eql_mem(buf, buf_ptr(other), buf_len(other));
}
uint32_t buf_hash(Buf *buf) {
assert(buf->list.length);
size_t interval = buf->list.length / 256;
if (interval == 0)
interval = 1;
// FNV 32-bit hash
uint32_t h = 2166136261;
for (size_t i = 0; i < buf_len(buf); i += interval) {
h = h ^ ((uint8_t)buf->list.at(i));
h = h * 16777619;
}
return h;
}