mirror of https://github.com/YosysHQ/yosys.git
101 lines
2.2 KiB
C
101 lines
2.2 KiB
C
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#include "kernel/yosys_common.h"
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#include <string>
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#ifndef YOSYS_IO_H
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#define YOSYS_IO_H
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#ifdef YOSYS_ENABLE_ZLIB
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#include <zlib.h>
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#endif
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YOSYS_NAMESPACE_BEGIN
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inline std::string vstringf(const char *fmt, va_list ap)
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{
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// For the common case of strings shorter than 128, save a heap
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// allocation by using a stack allocated buffer.
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const int kBufSize = 128;
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char buf[kBufSize];
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buf[0] = '\0';
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va_list apc;
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va_copy(apc, ap);
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int n = vsnprintf(buf, kBufSize, fmt, apc);
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va_end(apc);
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if (n < kBufSize)
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return std::string(buf);
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std::string string;
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char *str = NULL;
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#if defined(_WIN32) || defined(__CYGWIN__)
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int sz = 2 * kBufSize, rc;
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while (1) {
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va_copy(apc, ap);
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str = (char *)realloc(str, sz);
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rc = vsnprintf(str, sz, fmt, apc);
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va_end(apc);
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if (rc >= 0 && rc < sz)
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break;
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sz *= 2;
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}
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if (str != NULL) {
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string = str;
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free(str);
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}
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return string;
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#else
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if (vasprintf(&str, fmt, ap) < 0)
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str = NULL;
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if (str != NULL) {
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string = str;
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free(str);
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}
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return string;
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#endif
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}
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std::string stringf(const char *fmt, ...) YS_ATTRIBUTE(format(printf, 1, 2));
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inline std::string stringf(const char *fmt, ...)
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{
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std::string string;
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va_list ap;
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va_start(ap, fmt);
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string = vstringf(fmt, ap);
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va_end(ap);
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return string;
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}
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#ifdef YOSYS_ENABLE_ZLIB
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/*
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An output stream that uses a stringbuf to buffer data internally,
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using zlib to write gzip-compressed data every time the stream is flushed.
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*/
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class gzip_ostream : public std::ostream {
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public:
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gzip_ostream();
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bool open(const std::string &filename);
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private:
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class gzip_streambuf : public std::stringbuf {
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public:
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gzip_streambuf();
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bool open(const std::string &filename);
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virtual int sync() override;
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virtual ~gzip_streambuf();
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private:
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static const int buffer_size = 4096; // Size of the internal buffer
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char buffer[buffer_size]; // Internal buffer for compressed data
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gzFile gzf = nullptr; // Handle to the gzip file
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};
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gzip_streambuf outbuf; // The stream buffer instance
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};
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#endif // YOSYS_ENABLE_ZLIB
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std::istream* uncompressed(std::ifstream* f, const std::string filename);
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YOSYS_NAMESPACE_END
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#endif // YOSYS_IO_H
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