128 lines
2.6 KiB
C
128 lines
2.6 KiB
C
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2002 by Gary Czvitkovicz
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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/*
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* Minimal printf and snprintf formatting functions
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*
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* These support %c %s %d and %x
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* Field width and zero-padding flag only
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*/
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#include <stdarg.h>
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#include <string.h>
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static const char hexdigit[] = "0123456789ABCDEF";
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int vsnprintf (char *buf, int size, const char *fmt, va_list ap)
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{
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char *bp = buf;
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char *end = buf + size - 1;
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char *str;
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char tmpbuf[12], pad;
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int ch, width, val, sign;
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tmpbuf[sizeof tmpbuf - 1] = '\0';
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while ((ch = *fmt++) != '\0' && bp < end)
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{
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if (ch == '%')
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{
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ch = *fmt++;
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pad = ' ';
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if (ch == '0')
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pad = '0';
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width = 0;
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while (ch >= '0' && ch <= '9')
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{
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width = 10*width + ch - '0';
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ch = *fmt++;
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}
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str = tmpbuf + sizeof tmpbuf - 1;
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switch (ch)
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{
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case 'c':
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*--str = va_arg (ap, int);
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break;
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case 's':
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str = va_arg (ap, char*);
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break;
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case 'd':
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val = sign = va_arg (ap, int);
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if (val < 0)
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val = -val;
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do
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{
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*--str = (val % 10) + '0';
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val /= 10;
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}
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while (val > 0);
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if (sign < 0)
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*--str = '-';
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break;
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case 'x':
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case 'X':
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val = va_arg (ap, int);
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do
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{
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*--str = hexdigit[val & 0xf];
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val >>= 4;
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}
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while (val > 0);
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break;
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default:
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*--str = ch;
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break;
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}
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if (width > 0)
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{
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width -= strlen (str);
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while (width-- > 0 && buf < end)
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*bp++ = pad;
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}
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while (*str != '\0' && buf < end)
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*bp++ = *str++;
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}
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else
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*bp++ = ch;
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}
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*bp++ = '\0';
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return bp - buf - 1;
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}
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int snprintf (char *buf, int size, const char *fmt, ...)
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{
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int n;
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va_list ap;
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va_start (ap, fmt);
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n = vsnprintf (buf, size, fmt, ap);
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va_end (ap);
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return n;
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}
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