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annotate src/libsys/sprintf/integer.c @ 0:92470e5d0b9e

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src: partial import from FC Selenite
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 15 May 2020 01:28:16 +0000
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92470e5d0b9e src: partial import from FC Selenite
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1 /*
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2 * Embedded [v]sprintf() implementation by Mychaela Falconia,
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3 * loosely based on the 4.3BSD-Tahoe version.
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4 *
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5 * This module contains the integer conversion functions.
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6 */
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7
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8 #include <sys/types.h>
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9 #include <ctype.h>
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10 #include "defs.h"
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11
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12 extern u_char * _sprintf_field(u_char *op, int width, int flags, int sign,
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13 u_char *body, int size, int dprec, int fpprec);
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14
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15 static const char lcdigits[] = "0123456789abcdef";
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16 static const char ucdigits[] = "0123456789ABCDEF";
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17
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18 u_char *
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19 _sprintf_integer(u_char *op, int width, int flags, int sign,
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20 unsigned number, int base, int prec)
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21 {
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22 const char *digits;
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23 char buf[12];
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24 char *t, *endp;
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25
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26 /*
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27 * ``... diouXx conversions ... if a precision is
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28 * specified, the 0 flag will be ignored.''
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29 * -- ANSI X3J11
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30 */
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31 if (prec >= 0)
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32 flags &= ~ZEROPAD;
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33
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34 if (flags & UPPERCASE)
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35 digits = ucdigits;
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36 else
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37 digits = lcdigits;
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38
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39 /*
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40 * ``The result of converting a zero value with an
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41 * explicit precision of zero is no characters.''
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42 * -- ANSI X3J11
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43 */
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44 t = endp = buf + sizeof(buf);
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45 if (number != 0 || prec != 0) {
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46 do {
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47 *--t = digits[number % base];
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48 number /= base;
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49 } while (number);
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50 if (flags & ALT && base == 8 && *t != '0')
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51 *--t = '0'; /* octal leading 0 */
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52 }
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53 return _sprintf_field(op, width, flags, sign, t, endp - t, prec, 0);
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54 }