subr_prf.c

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10

    1 /*      $NetBSD: subr_prf.c,v 1.10 2003/08/07 16:32:30 agc Exp $        */
    2 
    3 /*-
    4  * Copyright (c) 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)printf.c    8.1 (Berkeley) 6/11/93
   32  */
   33 
   34 /*
   35  * Scaled down version of printf(3).
   36  */
   37 
   38 #include <sys/cdefs.h>
   39 #include <sys/types.h>
   40 #include <machine/stdarg.h>
   41 
   42 #include "stand.h"
   43 
   44 static void kprintn(void (*)(int), u_long, int);
   45 static void sputchar(int);
   46 static void kdoprnt(void (*)(int), const char *, va_list);
   47 
   48 static char *sbuf, *ebuf;
   49 
   50 static void
   51 sputchar(int c)
   52 {
   53 
   54         if (sbuf < ebuf)
   55                 *sbuf++ = c;
   56 }
   57 
   58 void
   59 vprintf(const char *fmt, va_list ap)
   60 {
   61 
   62         kdoprnt(putchar, fmt, ap);
   63 }
   64 
   65 int
   66 vsnprintf(char *buf, size_t size, const char *fmt, va_list ap)
   67 {
   68 
   69         sbuf = buf;
   70         ebuf = buf + size - 1;
   71         kdoprnt(sputchar, fmt, ap);
   72         *sbuf = '\0';
   73         return (sbuf - buf);
   74 }
   75 
   76 static void
   77 kdoprnt(void (*put)(int), const char *fmt, va_list ap)
   78 {
   79         char *p;
   80         int ch;
   81         unsigned long ul;
   82         int lflag;
   83 
   84         for (;;) {
   85                 while ((ch = *fmt++) != '%') {
   86                         if (ch == '\0')
   87                                 return;
   88                         put(ch);
   89                 }
   90                 lflag = 0;
   91 reswitch:       switch (ch = *fmt++) {
   92                 case 'l':
   93                         lflag = 1;
   94                         goto reswitch;
   95                 case 'c':
   96                         ch = va_arg(ap, int);
   97                                 put(ch & 0x7f);
   98                         break;
   99                 case 's':
  100                         p = va_arg(ap, char *);
  101                         while ((ch = *p++))
  102                                 put(ch);
  103                         break;
  104                 case 'd':
  105                         ul = lflag ?
  106                             va_arg(ap, long) : va_arg(ap, int);
  107                         if ((long)ul < 0) {
  108                                 put('-');
  109                                 ul = -(long)ul;
  110                         }
  111                         kprintn(put, ul, 10);
  112                         break;
  113                 case 'o':
  114                         ul = lflag ?
  115                             va_arg(ap, u_long) : va_arg(ap, u_int);
  116                         kprintn(put, ul, 8);
  117                         break;
  118                 case 'u':
  119                         ul = lflag ?
  120                             va_arg(ap, u_long) : va_arg(ap, u_int);
  121                         kprintn(put, ul, 10);
  122                         break;
  123                 case 'p':
  124                         put('');
  125                         put('x');
  126                         lflag = 1;
  127                         /* fall through */
  128                 case 'x':
  129                         ul = lflag ?
  130                             va_arg(ap, u_long) : va_arg(ap, u_int);
  131                         kprintn(put, ul, 16);
  132                         break;
  133                 default:
  134                         put('%');
  135                         if (lflag)
  136                                 put('l');
  137                         if (ch == '\0')
  138                                 return;
  139                         put(ch);
  140                 }
  141         }
  142 }
  143 
  144 static void
  145 kprintn(void (*put)(int), unsigned long ul, int base)
  146 {
  147                                         /* hold a long in base 8 */
  148         char *p, buf[(sizeof(long) * NBBY / 3) + 1];
  149 
  150         p = buf;
  151         do {
  152                 *p++ = "0123456789abcdef"[ul % base];
  153         } while (ul /= base);
  154         do {
  155                 put(*--p);
  156         } while (p > buf);
  157 }

Cache object: 4e4186d353a14e73bfc52ee1a630b9eb

[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.

FreeBSD/Linux Kernel Cross Reference sys/lib/libsa/subr_prf.c

FreeBSD/Linux Kernel Cross Reference
sys/lib/libsa/subr_prf.c