355 lines
7.0 KiB
C
355 lines
7.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) Paul Mackerras 1997.
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*/
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#include <stdarg.h>
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#include <stddef.h>
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#include "string.h"
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#include "stdio.h"
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#include "ops.h"
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size_t strnlen(const char * s, size_t count)
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{
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const char *sc;
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for (sc = s; count-- && *sc != '\0'; ++sc)
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/* nothing */;
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return sc - s;
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}
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char *strrchr(const char *s, int c)
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{
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const char *last = NULL;
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do {
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if (*s == (char)c)
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last = s;
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} while (*s++);
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return (char *)last;
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}
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#ifdef __powerpc64__
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# define do_div(n, base) ({ \
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unsigned int __base = (base); \
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unsigned int __rem; \
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__rem = ((unsigned long long)(n)) % __base; \
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(n) = ((unsigned long long)(n)) / __base; \
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__rem; \
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})
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#else
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extern unsigned int __div64_32(unsigned long long *dividend,
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unsigned int divisor);
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/* The unnecessary pointer compare is there
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* to check for type safety (n must be 64bit)
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*/
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# define do_div(n,base) ({ \
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unsigned int __base = (base); \
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unsigned int __rem; \
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(void)(((typeof((n)) *)0) == ((unsigned long long *)0)); \
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if (((n) >> 32) == 0) { \
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__rem = (unsigned int)(n) % __base; \
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(n) = (unsigned int)(n) / __base; \
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} else \
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__rem = __div64_32(&(n), __base); \
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__rem; \
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})
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#endif /* __powerpc64__ */
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static int skip_atoi(const char **s)
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{
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int i, c;
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for (i = 0; '0' <= (c = **s) && c <= '9'; ++*s)
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i = i*10 + c - '0';
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return i;
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}
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#define ZEROPAD 1 /* pad with zero */
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#define SIGN 2 /* unsigned/signed long */
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#define PLUS 4 /* show plus */
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#define SPACE 8 /* space if plus */
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#define LEFT 16 /* left justified */
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#define SPECIAL 32 /* 0x */
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#define LARGE 64 /* use 'ABCDEF' instead of 'abcdef' */
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static char * number(char * str, unsigned long long num, int base, int size, int precision, int type)
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{
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char c,sign,tmp[66];
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const char *digits="0123456789abcdefghijklmnopqrstuvwxyz";
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int i;
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if (type & LARGE)
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digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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if (type & LEFT)
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type &= ~ZEROPAD;
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if (base < 2 || base > 36)
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return 0;
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c = (type & ZEROPAD) ? '0' : ' ';
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sign = 0;
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if (type & SIGN) {
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if ((signed long long)num < 0) {
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sign = '-';
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num = - (signed long long)num;
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size--;
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} else if (type & PLUS) {
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sign = '+';
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size--;
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} else if (type & SPACE) {
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sign = ' ';
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size--;
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}
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}
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if (type & SPECIAL) {
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if (base == 16)
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size -= 2;
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else if (base == 8)
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size--;
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}
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i = 0;
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if (num == 0)
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tmp[i++]='0';
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else while (num != 0) {
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tmp[i++] = digits[do_div(num, base)];
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}
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if (i > precision)
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precision = i;
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size -= precision;
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if (!(type&(ZEROPAD+LEFT)))
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while(size-->0)
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*str++ = ' ';
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if (sign)
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*str++ = sign;
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if (type & SPECIAL) {
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if (base==8)
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*str++ = '0';
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else if (base==16) {
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*str++ = '0';
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*str++ = digits[33];
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}
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}
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if (!(type & LEFT))
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while (size-- > 0)
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*str++ = c;
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while (i < precision--)
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*str++ = '0';
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while (i-- > 0)
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*str++ = tmp[i];
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while (size-- > 0)
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*str++ = ' ';
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return str;
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}
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int vsprintf(char *buf, const char *fmt, va_list args)
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{
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int len;
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unsigned long long num;
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int i, base;
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char * str;
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const char *s;
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int flags; /* flags to number() */
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int field_width; /* width of output field */
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int precision; /* min. # of digits for integers; max
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number of chars for from string */
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int qualifier; /* 'h', 'l', or 'L' for integer fields */
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/* 'z' support added 23/7/1999 S.H. */
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/* 'z' changed to 'Z' --davidm 1/25/99 */
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for (str=buf ; *fmt ; ++fmt) {
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if (*fmt != '%') {
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*str++ = *fmt;
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continue;
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}
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/* process flags */
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flags = 0;
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repeat:
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++fmt; /* this also skips first '%' */
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switch (*fmt) {
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case '-': flags |= LEFT; goto repeat;
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case '+': flags |= PLUS; goto repeat;
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case ' ': flags |= SPACE; goto repeat;
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case '#': flags |= SPECIAL; goto repeat;
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case '0': flags |= ZEROPAD; goto repeat;
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}
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/* get field width */
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field_width = -1;
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if ('0' <= *fmt && *fmt <= '9')
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field_width = skip_atoi(&fmt);
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else if (*fmt == '*') {
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++fmt;
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/* it's the next argument */
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field_width = va_arg(args, int);
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if (field_width < 0) {
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field_width = -field_width;
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flags |= LEFT;
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}
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}
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/* get the precision */
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precision = -1;
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if (*fmt == '.') {
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++fmt;
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if ('0' <= *fmt && *fmt <= '9')
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precision = skip_atoi(&fmt);
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else if (*fmt == '*') {
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++fmt;
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/* it's the next argument */
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precision = va_arg(args, int);
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}
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if (precision < 0)
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precision = 0;
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}
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/* get the conversion qualifier */
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qualifier = -1;
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if (*fmt == 'l' && *(fmt + 1) == 'l') {
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qualifier = 'q';
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fmt += 2;
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} else if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L'
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|| *fmt == 'Z') {
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qualifier = *fmt;
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++fmt;
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}
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/* default base */
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base = 10;
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switch (*fmt) {
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case 'c':
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if (!(flags & LEFT))
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while (--field_width > 0)
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*str++ = ' ';
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*str++ = (unsigned char) va_arg(args, int);
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while (--field_width > 0)
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*str++ = ' ';
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continue;
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case 's':
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s = va_arg(args, char *);
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if (!s)
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s = "<NULL>";
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len = strnlen(s, precision);
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if (!(flags & LEFT))
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while (len < field_width--)
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*str++ = ' ';
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for (i = 0; i < len; ++i)
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*str++ = *s++;
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while (len < field_width--)
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*str++ = ' ';
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continue;
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case 'p':
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if (field_width == -1) {
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field_width = 2*sizeof(void *);
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flags |= ZEROPAD;
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}
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str = number(str,
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(unsigned long) va_arg(args, void *), 16,
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field_width, precision, flags);
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continue;
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case 'n':
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if (qualifier == 'l') {
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long * ip = va_arg(args, long *);
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*ip = (str - buf);
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} else if (qualifier == 'Z') {
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size_t * ip = va_arg(args, size_t *);
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*ip = (str - buf);
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} else {
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int * ip = va_arg(args, int *);
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*ip = (str - buf);
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}
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continue;
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case '%':
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*str++ = '%';
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continue;
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/* integer number formats - set up the flags and "break" */
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case 'o':
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base = 8;
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break;
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case 'X':
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flags |= LARGE;
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case 'x':
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base = 16;
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break;
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case 'd':
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case 'i':
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flags |= SIGN;
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case 'u':
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break;
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default:
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*str++ = '%';
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if (*fmt)
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*str++ = *fmt;
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else
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--fmt;
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continue;
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}
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if (qualifier == 'l') {
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num = va_arg(args, unsigned long);
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if (flags & SIGN)
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num = (signed long) num;
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} else if (qualifier == 'q') {
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num = va_arg(args, unsigned long long);
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if (flags & SIGN)
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num = (signed long long) num;
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} else if (qualifier == 'Z') {
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num = va_arg(args, size_t);
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} else if (qualifier == 'h') {
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num = (unsigned short) va_arg(args, int);
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if (flags & SIGN)
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num = (signed short) num;
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} else {
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num = va_arg(args, unsigned int);
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if (flags & SIGN)
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num = (signed int) num;
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}
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str = number(str, num, base, field_width, precision, flags);
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}
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*str = '\0';
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return str-buf;
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}
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int sprintf(char * buf, const char *fmt, ...)
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{
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va_list args;
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int i;
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va_start(args, fmt);
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i=vsprintf(buf,fmt,args);
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va_end(args);
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return i;
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}
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static char sprint_buf[1024];
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int
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printf(const char *fmt, ...)
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{
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va_list args;
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int n;
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va_start(args, fmt);
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n = vsprintf(sprint_buf, fmt, args);
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va_end(args);
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if (console_ops.write)
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console_ops.write(sprint_buf, n);
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return n;
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}
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