usr/src/bin/csh/printf.c

/*-
 * Copyright (c) 1991 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char sccsid[] = "@(#)printf.c    5.4 (Berkeley) 6/16/91";
#endif /* not lint */

/*
 * tc.printf.c: A public-domain, minimal printf/sprintf routine that prints
 *             through the putchar() routine.  Feel free to use for
 *             anything...  -- 7/17/87 Paul Placeway
 */
#include <strings.h>
#include <stdlib.h>
#if __STDC__
# include <stdarg.h>
#else
# include <varargs.h>
#endif
#include "csh.h"
#include "char.h"
#include "extern.h"

#ifdef lint
#undef va_arg
#define va_arg(a, b) (a ? (b) 0 : (b) 0)
#endif

#define INF     32766           /* should be bigger than any field to print */

static unsigned char buf[128];

static void
doprnt(addchar, sfmt, ap)
    void    (*addchar) ();
    char   *sfmt;
    va_list ap;
{
    register unsigned char *f, *bp;
    register long l;
    register unsigned long u;
    register int i;
    register int fmt;
    register unsigned char pad = ' ';
    int     flush_left = 0, f_width = 0, prec = INF, hash = 0, do_long = 0;
    int     sign = 0;

    f = (unsigned char *) sfmt;
    for (; *f; f++) {
        if (*f != '%') {        /* then just out the char */
            (*addchar) ((int) (*f));
        }
        else {
            f++;                /* skip the % */

            if (*f == '-') {    /* minus: flush left */
                flush_left = 1;
                f++;
            }

            if (*f == '0' || *f == '.') {
                /* padding with 0 rather than blank */
                pad = '0';
                f++;
            }
            if (*f == '*') {    /* field width */
                f_width = va_arg(ap, int);
                f++;
            }
            else if (Isdigit(*f)) {
                f_width = atoi((char *) f);
                while (Isdigit(*f))
                    f++;        /* skip the digits */
            }

            if (*f == '.') {    /* precision */
                f++;
                if (*f == '*') {
                    prec = va_arg(ap, int);
                    f++;
                }
                else if (Isdigit(*f)) {
                    prec = atoi((char *) f);
                    while (Isdigit(*f))
                        f++;    /* skip the digits */
                }
            }

            if (*f == '#') {    /* alternate form */
                hash = 1;
                f++;
            }

            if (*f == 'l') {    /* long format */
                do_long = 1;
                f++;
            }

            fmt = *f;
            if (Isupper(fmt)) {
                do_long = 1;
                fmt = Tolower(fmt);
            }
            bp = buf;
            switch (fmt) {      /* do the format */
            case 'd':
                if (do_long)
                    l = va_arg(ap, long);
                else
                    l = (long) (va_arg(ap, int));
                if (l < 0) {
                    sign = 1;
                    l = -l;
                }
                do {
                    *bp++ = l % 10 + '0';
                } while ((l /= 10) > 0);
                if (sign)
                    *bp++ = '-';
                f_width = f_width - (bp - buf);
                if (!flush_left)
                    while (f_width-- > 0)
                        (*addchar) ((int) (pad));
                for (bp--; bp >= buf; bp--)
                    (*addchar) ((int) (*bp));
                if (flush_left)
                    while (f_width-- > 0)
                        (*addchar) ((int) (' '));
                break;

            case 'o':
            case 'x':
            case 'u':
                if (do_long)
                    u = va_arg(ap, unsigned long);
                else
                    u = (unsigned long) (va_arg(ap, unsigned));
                if (fmt == 'u') {       /* unsigned decimal */
                    do {
                        *bp++ = u % 10 + '0';
                    } while ((u /= 10) > 0);
                }
                else if (fmt == 'o') {  /* octal */
                    do {
                        *bp++ = u % 8 + '0';
                    } while ((u /= 8) > 0);
                    if (hash)
                        *bp++ = '0';
                }
                else if (fmt == 'x') {  /* hex */
                    do {
                        i = u % 16;
                        if (i < 10)
                            *bp++ = i + '0';
                        else
                            *bp++ = i - 10 + 'a';
                    } while ((u /= 16) > 0);
                    if (hash) {
                        *bp++ = 'x';
                        *bp++ = '0';
                    }
                }
                i = f_width - (bp - buf);
                if (!flush_left)
                    while (i-- > 0)
                        (*addchar) ((int) (pad));
                for (bp--; bp >= buf; bp--)
                    (*addchar) ((int) (*bp));
                if (flush_left)
                    while (i-- > 0)
                        (*addchar) ((int) (' '));
                break;


            case 'c':
                i = va_arg(ap, int);
                (*addchar) ((int) (i));
                break;

            case 's':
                bp = va_arg(ap, unsigned char *);
                if (!bp)
                    bp = (unsigned char *) "(nil)";
                f_width = f_width - strlen((char *) bp);
                if (!flush_left)
                    while (f_width-- > 0)
                        (*addchar) ((int) (pad));
                for (i = 0; *bp && i < prec; i++) {
                    (*addchar) ((int) (*bp));
                    bp++;
                }
                if (flush_left)
                    while (f_width-- > 0)
                        (*addchar) ((int) (' '));

                break;

            case '%':
                (*addchar) ((int) ('%'));
                break;
            }
            flush_left = 0, f_width = 0, prec = INF, hash = 0, do_long = 0;
            sign = 0;
            pad = ' ';
        }
    }
}


static unsigned char *xstring;
static void
xaddchar(c)
    int     c;
{
    *xstring++ = c;
}


void
#if __STDC__
xsprintf(char *str, char *fmt, ...)
#else
xsprintf(str, fmt, va_alist)
    char   *str;
    char   *fmt;
    va_dcl
#endif
{
    va_list va;

#if __STDC__
    va_start(va, fmt);
#else
    va_start(va);
#endif
    xstring = (unsigned char *) str;
    doprnt(xaddchar, fmt, va);
    va_end(va);
    *xstring++ = '\0';
}


void
#if __STDC__
xprintf(char *fmt, ...)
#else
xprintf(fmt, va_alist)
    char   *fmt;
    va_dcl
#endif
{
    va_list va;

#if __STDC__
    va_start(va, fmt);
#else
    va_start(va);
#endif
    doprnt(xputchar, fmt, va);
    va_end(va);
}


void
xvprintf(fmt, va)
    char   *fmt;
    va_list va;
{
    doprnt(xputchar, fmt, va);
}

void
xvsprintf(str, fmt, va)
    char   *str;
    char   *fmt;
    va_list va;
{
    xstring = (unsigned char *) str;
    doprnt(xaddchar, fmt, va);
    *xstring++ = '\0';
}