Return to efi_strings.c CVS log

Up to [Qemu by Fabrice Bellard] / qemu / roms / ipxe / src / interface / efi

Annotation of qemu/roms/ipxe/src/interface/efi/efi_strings.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (C) 2011 Michael Brown <[email protected]>.
        !             3:  *
        !             4:  * This program is free software; you can redistribute it and/or
        !             5:  * modify it under the terms of the GNU General Public License as
        !             6:  * published by the Free Software Foundation; either version 2 of the
        !             7:  * License, or any later version.
        !             8:  *
        !             9:  * This program is distributed in the hope that it will be useful, but
        !            10:  * WITHOUT ANY WARRANTY; without even the implied warranty of
        !            11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
        !            12:  * General Public License for more details.
        !            13:  *
        !            14:  * You should have received a copy of the GNU General Public License
        !            15:  * along with this program; if not, write to the Free Software
        !            16:  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
        !            17:  */
        !            18: 
        !            19: FILE_LICENCE ( GPL2_OR_LATER );
        !            20: 
        !            21: #include <stddef.h>
        !            22: #include <stdarg.h>
        !            23: #include <ipxe/vsprintf.h>
        !            24: #include <ipxe/efi/efi_strings.h>
        !            25: 
        !            26: /** Context used by efi_vsnprintf() and friends */
        !            27: struct efi_sputc_context {
        !            28:        /** printf context */
        !            29:        struct printf_context ctx;
        !            30:        /** Buffer for formatted string (used by efi_printf_sputc()) */
        !            31:        wchar_t *buf;
        !            32:        /** Buffer length (used by efi_printf_sputc())
        !            33:         *
        !            34:         * Note that this is a number of wide characters, not a number
        !            35:         * of bytes.
        !            36:         */
        !            37:        size_t max_wlen;
        !            38: };
        !            39: 
        !            40: /**
        !            41:  * Write wide character to buffer
        !            42:  *
        !            43:  * @v ctx              Context
        !            44:  * @v c                        Character
        !            45:  */
        !            46: static void efi_printf_sputc ( struct printf_context *ctx, unsigned int c ) {
        !            47:        struct efi_sputc_context * sctx =
        !            48:                container_of ( ctx, struct efi_sputc_context, ctx );
        !            49: 
        !            50:        if ( ctx->len < sctx->max_wlen )
        !            51:                sctx->buf[ctx->len] = c;
        !            52: }
        !            53: 
        !            54: /**
        !            55:  * Write a formatted string to a wide-character buffer
        !            56:  *
        !            57:  * @v wbuf             Buffer into which to write the string
        !            58:  * @v wsize            Size of buffer (in wide characters)
        !            59:  * @v fmt              Format string
        !            60:  * @v args             Arguments corresponding to the format string
        !            61:  * @ret wlen           Length of formatted string (in wide characters)
        !            62:  *
        !            63:  * If the buffer is too small to contain the string, the returned
        !            64:  * length is the length that would have been written had enough space
        !            65:  * been available.
        !            66:  */
        !            67: int efi_vsnprintf ( wchar_t *wbuf, size_t wsize, const char *fmt,
        !            68:                    va_list args ) {
        !            69:        struct efi_sputc_context sctx;
        !            70:        size_t wlen;
        !            71:        size_t wend;
        !            72: 
        !            73:        /* Hand off to vcprintf */
        !            74:        sctx.ctx.handler = efi_printf_sputc;
        !            75:        sctx.buf = wbuf;
        !            76:        sctx.max_wlen = wsize;
        !            77:        wlen = vcprintf ( &sctx.ctx, fmt, args );
        !            78: 
        !            79:        /* Add trailing NUL */
        !            80:        if ( wsize ) {
        !            81:                wend = wsize - 1;
        !            82:                if ( wlen < wend )
        !            83:                        wend = wlen;
        !            84:                wbuf[wend] = '\0';
        !            85:        }
        !            86: 
        !            87:        return wlen;
        !            88: }
        !            89: 
        !            90: /**
        !            91:  * Write a formatted string to a buffer
        !            92:  *
        !            93:  * @v wbuf             Buffer into which to write the string
        !            94:  * @v wsize            Size of buffer (in wide characters)
        !            95:  * @v fmt              Format string
        !            96:  * @v ...              Arguments corresponding to the format string
        !            97:  * @ret wlen           Length of formatted string (in wide characters)
        !            98:  */
        !            99: int efi_snprintf ( wchar_t *wbuf, size_t wsize, const char *fmt, ... ) {
        !           100:        va_list args;
        !           101:        int i;
        !           102: 
        !           103:        va_start ( args, fmt );
        !           104:        i = efi_vsnprintf ( wbuf, wsize, fmt, args );
        !           105:        va_end ( args );
        !           106:        return i;
        !           107: }
        !           108: 
        !           109: /**
        !           110:  * Version of efi_vsnprintf() that accepts a signed buffer size
        !           111:  *
        !           112:  * @v wbuf             Buffer into which to write the string
        !           113:  * @v swsize           Size of buffer (in wide characters)
        !           114:  * @v fmt              Format string
        !           115:  * @v args             Arguments corresponding to the format string
        !           116:  * @ret wlen           Length of formatted string (in wide characters)
        !           117:  */
        !           118: int efi_vssnprintf ( wchar_t *wbuf, ssize_t swsize, const char *fmt,
        !           119:                     va_list args ) {
        !           120: 
        !           121:        /* Treat negative buffer size as zero buffer size */
        !           122:        if ( swsize < 0 )
        !           123:                swsize = 0;
        !           124: 
        !           125:        /* Hand off to vsnprintf */
        !           126:        return efi_vsnprintf ( wbuf, swsize, fmt, args );
        !           127: }
        !           128: 
        !           129: /**
        !           130:  * Version of efi_vsnprintf() that accepts a signed buffer size
        !           131:  *
        !           132:  * @v wbuf             Buffer into which to write the string
        !           133:  * @v swsize           Size of buffer (in wide characters)
        !           134:  * @v fmt              Format string
        !           135:  * @v ...              Arguments corresponding to the format string
        !           136:  * @ret wlen           Length of formatted string (in wide characters)
        !           137:  */
        !           138: int efi_ssnprintf ( wchar_t *wbuf, ssize_t swsize, const char *fmt, ... ) {
        !           139:        va_list args;
        !           140:        int len;
        !           141: 
        !           142:        /* Hand off to vssnprintf */
        !           143:        va_start ( args, fmt );
        !           144:        len = efi_vssnprintf ( wbuf, swsize, fmt, args );
        !           145:        va_end ( args );
        !           146:        return len;
        !           147: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.