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+/*
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+ * Copyright (C) 2011 Michael Brown <mbrown@fensystems.co.uk>.
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License as
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+ * published by the Free Software Foundation; either version 2 of the
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+ * License, or any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful, but
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+ * WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ * General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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+ */
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+
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+FILE_LICENCE ( GPL2_OR_LATER );
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+
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+#include <stddef.h>
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+#include <stdarg.h>
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+#include <ipxe/vsprintf.h>
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+#include <ipxe/efi/efi_strings.h>
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+
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+/** Context used by efi_vsnprintf() and friends */
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+struct efi_sputc_context {
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+ /** printf context */
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+ struct printf_context ctx;
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+ /** Buffer for formatted string (used by efi_printf_sputc()) */
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+ wchar_t *buf;
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+ /** Buffer length (used by efi_printf_sputc())
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+ *
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+ * Note that this is a number of wide characters, not a number
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+ * of bytes.
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+ */
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+ size_t max_wlen;
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+};
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+
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+/**
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+ * Write wide character to buffer
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+ *
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+ * @v ctx Context
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+ * @v c Character
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+ */
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+static void efi_printf_sputc ( struct printf_context *ctx, unsigned int c ) {
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+ struct efi_sputc_context * sctx =
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+ container_of ( ctx, struct efi_sputc_context, ctx );
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+
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+ if ( ctx->len < sctx->max_wlen )
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+ sctx->buf[ctx->len] = c;
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+}
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+
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+/**
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+ * Write a formatted string to a wide-character buffer
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+ *
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+ * @v wbuf Buffer into which to write the string
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+ * @v wsize Size of buffer (in wide characters)
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+ * @v fmt Format string
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+ * @v args Arguments corresponding to the format string
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+ * @ret wlen Length of formatted string (in wide characters)
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+ *
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+ * If the buffer is too small to contain the string, the returned
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+ * length is the length that would have been written had enough space
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+ * been available.
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+ */
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+int efi_vsnprintf ( wchar_t *wbuf, size_t wsize, const char *fmt,
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+ va_list args ) {
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+ struct efi_sputc_context sctx;
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+ size_t wlen;
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+ size_t wend;
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+
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+ /* Hand off to vcprintf */
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+ sctx.ctx.handler = efi_printf_sputc;
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+ sctx.buf = wbuf;
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+ sctx.max_wlen = wsize;
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+ wlen = vcprintf ( &sctx.ctx, fmt, args );
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+
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+ /* Add trailing NUL */
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+ if ( wsize ) {
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+ wend = wsize - 1;
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+ if ( wlen < wend )
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+ wend = wlen;
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+ wbuf[wend] = '\0';
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+ }
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+
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+ return wlen;
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+}
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+
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+/**
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+ * Write a formatted string to a buffer
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+ *
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+ * @v wbuf Buffer into which to write the string
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+ * @v wsize Size of buffer (in wide characters)
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+ * @v fmt Format string
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+ * @v ... Arguments corresponding to the format string
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+ * @ret wlen Length of formatted string (in wide characters)
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+ */
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+int efi_snprintf ( wchar_t *wbuf, size_t wsize, const char *fmt, ... ) {
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+ va_list args;
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+ int i;
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+
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+ va_start ( args, fmt );
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+ i = efi_vsnprintf ( wbuf, wsize, fmt, args );
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+ va_end ( args );
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+ return i;
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+}
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+
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+/**
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+ * Version of efi_vsnprintf() that accepts a signed buffer size
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+ *
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+ * @v wbuf Buffer into which to write the string
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+ * @v swsize Size of buffer (in wide characters)
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+ * @v fmt Format string
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+ * @v args Arguments corresponding to the format string
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+ * @ret wlen Length of formatted string (in wide characters)
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+ */
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+int efi_vssnprintf ( wchar_t *wbuf, ssize_t swsize, const char *fmt,
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+ va_list args ) {
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+
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+ /* Treat negative buffer size as zero buffer size */
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+ if ( swsize < 0 )
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+ swsize = 0;
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+
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+ /* Hand off to vsnprintf */
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+ return efi_vsnprintf ( wbuf, swsize, fmt, args );
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+}
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+
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+/**
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+ * Version of efi_vsnprintf() that accepts a signed buffer size
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+ *
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+ * @v wbuf Buffer into which to write the string
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+ * @v swsize Size of buffer (in wide characters)
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+ * @v fmt Format string
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+ * @v ... Arguments corresponding to the format string
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+ * @ret wlen Length of formatted string (in wide characters)
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+ */
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+int efi_ssnprintf ( wchar_t *wbuf, ssize_t swsize, const char *fmt, ... ) {
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+ va_list args;
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+ int len;
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+
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+ /* Hand off to vssnprintf */
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+ va_start ( args, fmt );
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+ len = efi_vssnprintf ( wbuf, swsize, fmt, args );
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+ va_end ( args );
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+ return len;
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+}
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Michael Brown
13 år sedan