foo
Eggert Jung
6 months ago
parent
383561a4f6
commit
7214ce8e53
@ -0,0 +1,2 @@
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-Iarch
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-xc++
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@ -0,0 +1,193 @@
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/*
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Copyright 2001 Georges Menie
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https://www.menie.org/georges/embedded/small_printf_source_code.html
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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putchar is the only external dependency for this file,
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if you have a working putchar, just remove the following
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define. If the function should be called something else,
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replace outbyte(c) by your own function call.
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*/
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static void printchar(char **str, int c)
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{
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extern int putchar(int c);
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if (str) {
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**str = c;
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++(*str);
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}
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//else (void)putchar(c);
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}
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#define PAD_RIGHT 1
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#define PAD_ZERO 2
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static int prints(char **out, const char *string, int width, int pad)
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{
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int pc = 0, padchar = ' ';
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if (width > 0) {
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int len = 0;
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const char *ptr;
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for (ptr = string; *ptr; ++ptr) ++len;
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if (len >= width) width = 0;
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else width -= len;
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if (pad & PAD_ZERO) padchar = '0';
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}
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if (!(pad & PAD_RIGHT)) {
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for ( ; width > 0; --width) {
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printchar (out, padchar);
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++pc;
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}
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}
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for ( ; *string ; ++string) {
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printchar (out, *string);
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++pc;
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}
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for ( ; width > 0; --width) {
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printchar (out, padchar);
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++pc;
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}
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return pc;
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}
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/* the following should be enough for 32 bit int */
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#define PRINT_BUF_LEN 12
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static int printi(char **out, int i, int b, int sg, int width, int pad, int letbase)
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{
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char print_buf[PRINT_BUF_LEN];
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char *s;
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int t, neg = 0, pc = 0;
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unsigned int u = i;
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if (i == 0) {
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print_buf[0] = '0';
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print_buf[1] = '\0';
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return prints (out, print_buf, width, pad);
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}
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if (sg && b == 10 && i < 0) {
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neg = 1;
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u = -i;
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}
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s = print_buf + PRINT_BUF_LEN-1;
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*s = '\0';
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while (u) {
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t = u % b;
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if( t >= 10 )
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t += letbase - '0' - 10;
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*--s = t + '0';
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u /= b;
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}
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if (neg) {
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if( width && (pad & PAD_ZERO) ) {
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printchar (out, '-');
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++pc;
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--width;
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}
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else {
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*--s = '-';
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}
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}
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return pc + prints (out, s, width, pad);
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}
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static int print(char **out, int *varg)
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{
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int width, pad;
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int pc = 0;
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char *format = reinterpret_cast<char*>(*varg++);
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char scr[2];
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for (; *format != 0; ++format) {
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if (*format == '%') {
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++format;
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width = pad = 0;
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if (*format == '\0') break;
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if (*format == '%') goto out;
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if (*format == '-') {
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++format;
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pad = PAD_RIGHT;
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}
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while (*format == '0') {
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++format;
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pad |= PAD_ZERO;
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}
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for ( ; *format >= '0' && *format <= '9'; ++format) {
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width *= 10;
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width += *format - '0';
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}
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if( *format == 's' ) {
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char *s = *((char **)varg++);
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pc += prints (out, s?s:"(null)", width, pad);
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continue;
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}
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if( *format == 'd' ) {
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pc += printi (out, *varg++, 10, 1, width, pad, 'a');
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continue;
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}
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if( *format == 'x' ) {
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pc += printi (out, *varg++, 16, 0, width, pad, 'a');
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continue;
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}
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if( *format == 'X' ) {
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pc += printi (out, *varg++, 16, 0, width, pad, 'A');
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continue;
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}
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if( *format == 'u' ) {
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pc += printi (out, *varg++, 10, 0, width, pad, 'a');
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continue;
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}
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if( *format == 'c' ) {
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/* char are converted to int then pushed on the stack */
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scr[0] = *varg++;
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scr[1] = '\0';
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pc += prints (out, scr, width, pad);
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continue;
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}
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}
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else {
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out:
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printchar (out, *format);
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++pc;
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}
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}
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if (out) **out = '\0';
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return pc;
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}
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/* assuming sizeof(void *) == sizeof(int) */
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extern "C" int printf(const char *format, ...)
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{
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int *varg = (int *)(&format);
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return print(0, varg);
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}
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extern "C" int sprintf(char *out, const char *format, ...)
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{
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int *varg = (int *)(&format);
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return print(&out, varg);
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}
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@ -0,0 +1,7 @@
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extern "C" {
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int printf(const char *format, ...);
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int sprintf(char *out, const char *format, ...);
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}
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