kopia lustrzana https://github.com/micropython/micropython
278 wiersze
7.6 KiB
C
278 wiersze
7.6 KiB
C
#include <stdarg.h>
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#include "std.h"
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#define PF_FLAG_LEFT_ADJUST (0x01)
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#define PF_FLAG_SHOW_SIGN (0x02)
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#define PF_FLAG_SPACE_SIGN (0x04)
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#define PF_FLAG_NO_TRAILZ (0x08)
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#define PF_FLAG_ZERO_PAD (0x10)
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// tricky; we compute pad string by: pad_chars + (flags & PF_FLAG_ZERO_PAD)
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#define PF_PAD_SIZE PF_FLAG_ZERO_PAD
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static const char *pad_chars = " 0000000000000000";
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typedef struct _pfenv_t {
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void *data;
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void (*print_strn)(void *, const char *str, unsigned int len);
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} pfenv_t;
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static void print_str_dummy(void *data, const char *str, unsigned int len) {
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}
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const pfenv_t pfenv_dummy = {0, print_str_dummy};
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static int pfenv_print_strn(const pfenv_t *pfenv, const char *str, unsigned int len, int flags, int width) {
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int pad = width - len;
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if (pad > 0 && (flags & PF_FLAG_LEFT_ADJUST) == 0) {
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while (pad > 0) {
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int p = pad;
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if (p > PF_PAD_SIZE)
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p = PF_PAD_SIZE;
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pfenv->print_strn(pfenv->data, pad_chars + (flags & PF_FLAG_ZERO_PAD), p);
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pad -= p;
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}
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}
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pfenv->print_strn(pfenv->data, str, len);
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while (pad > 0) {
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int p = pad;
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if (p > PF_PAD_SIZE)
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p = PF_PAD_SIZE;
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pfenv->print_strn(pfenv->data, pad_chars, p);
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pad -= p;
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}
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return len;
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}
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// enough room for 32 signed number
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#define INT_BUF_SIZE (12)
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static int pfenv_print_int(const pfenv_t *pfenv, unsigned int x, int sgn, int base, int base_char, int flags, int width) {
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char sign = 0;
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if (sgn) {
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if ((int)x < 0) {
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sign = '-';
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x = -x;
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} else if (flags & PF_FLAG_SHOW_SIGN) {
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sign = '+';
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} else if (flags & PF_FLAG_SPACE_SIGN) {
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sign = ' ';
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}
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}
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char buf[INT_BUF_SIZE];
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char *b = buf + INT_BUF_SIZE;
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if (x == 0) {
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*(--b) = '0';
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} else {
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do {
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int c = x % base;
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x /= base;
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if (c >= 10) {
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c += base_char - 10;
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} else {
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c += '0';
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}
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*(--b) = c;
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} while (b > buf && x != 0);
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}
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if (b > buf && sign != 0) {
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*(--b) = sign;
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}
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return pfenv_print_strn(pfenv, b, buf + INT_BUF_SIZE - b, flags, width);
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}
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void pfenv_prints(const pfenv_t *pfenv, const char *str) {
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pfenv->print_strn(pfenv->data, str, strlen(str));
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}
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int pfenv_printf(const pfenv_t *pfenv, const char *fmt, va_list args) {
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int chrs = 0;
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for (;;) {
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{
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const char *f = fmt;
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while (*f != '\0' && *f != '%') {
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++f; // XXX UTF8 advance char
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}
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if (f > fmt) {
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pfenv->print_strn(pfenv->data, fmt, f - fmt);
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chrs += f - fmt;
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fmt = f;
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}
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}
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if (*fmt == '\0') {
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break;
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}
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// move past % character
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++fmt;
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// parse flags, if they exist
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int flags = 0;
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while (*fmt != '\0') {
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if (*fmt == '-') flags |= PF_FLAG_LEFT_ADJUST;
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else if (*fmt == '+') flags |= PF_FLAG_SHOW_SIGN;
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else if (*fmt == ' ') flags |= PF_FLAG_SPACE_SIGN;
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else if (*fmt == '!') flags |= PF_FLAG_NO_TRAILZ;
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else if (*fmt == '0') flags |= PF_FLAG_ZERO_PAD;
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else break;
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++fmt;
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}
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// parse width, if it exists
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int width = 0;
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for (; '0' <= *fmt && *fmt <= '9'; ++fmt) {
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width = width * 10 + *fmt - '0';
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}
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// parse precision, if it exists
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int prec = -1;
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if (*fmt == '.') {
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++fmt;
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if (*fmt == '*') {
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++fmt;
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prec = va_arg(args, int);
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} else {
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prec = 0;
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for (; '0' <= *fmt && *fmt <= '9'; ++fmt) {
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prec = prec * 10 + *fmt - '0';
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}
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}
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if (prec < 0) {
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prec = 0;
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}
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}
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// parse long specifiers (current not used)
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//bool long_arg = false;
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if (*fmt == 'l') {
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++fmt;
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//long_arg = true;
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}
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if (*fmt == '\0') {
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break;
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}
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switch (*fmt) {
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case 'b':
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if (va_arg(args, int)) {
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chrs += pfenv_print_strn(pfenv, "true", 4, flags, width);
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} else {
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chrs += pfenv_print_strn(pfenv, "false", 5, flags, width);
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}
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break;
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case 'c':
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{
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char str = va_arg(args, int);
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chrs += pfenv_print_strn(pfenv, &str, 1, flags, width);
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break;
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}
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case 's':
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{
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const char *str = va_arg(args, const char*);
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if (str) {
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if (prec < 0) {
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prec = strlen(str);
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}
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chrs += pfenv_print_strn(pfenv, str, prec, flags, width);
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} else {
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chrs += pfenv_print_strn(pfenv, "(null)", 6, flags, width);
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}
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break;
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}
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case 'u':
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chrs += pfenv_print_int(pfenv, va_arg(args, int), 0, 10, 'a', flags, width);
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break;
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case 'd':
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chrs += pfenv_print_int(pfenv, va_arg(args, int), 1, 10, 'a', flags, width);
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break;
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case 'x':
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case 'p': // ?
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chrs += pfenv_print_int(pfenv, va_arg(args, int), 0, 16, 'a', flags, width);
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break;
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case 'X':
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case 'P': // ?
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chrs += pfenv_print_int(pfenv, va_arg(args, int), 0, 16, 'A', flags, width);
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break;
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default:
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pfenv->print_strn(pfenv->data, fmt, 1);
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chrs += 1;
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break;
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}
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++fmt;
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}
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return chrs;
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}
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void lcd_print_strn(const char *str, unsigned int len);
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void usb_vcp_send(const char* str, int len);
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void stdout_print_strn(void *data, const char *str, unsigned int len) {
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// send stdout to LCD and USB CDC VCP
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lcd_print_strn(str, len);
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usb_vcp_send(str, len);
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}
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static const pfenv_t pfenv_stdout = {0, stdout_print_strn};
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int printf(const char *fmt, ...) {
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va_list args;
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va_start(args, fmt);
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return pfenv_printf(&pfenv_stdout, fmt, args);
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}
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// need this because gcc optimises printf("%c", c) -> putchar(c), and printf("a") -> putchar('a')
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int putchar(int c) {
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char chr = c;
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stdout_print_strn(0, &chr, 1);
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return chr;
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}
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// need this because gcc optimises printf("string\n") -> puts("string")
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int puts(const char *s) {
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stdout_print_strn(0, s, strlen(s));
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char chr = '\n';
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stdout_print_strn(0, &chr, 1);
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return 1;
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}
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typedef struct _strn_pfenv_t {
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char *cur;
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size_t remain;
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} strn_pfenv_t;
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void strn_print_strn(void *data, const char *str, unsigned int len) {
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strn_pfenv_t *strn_pfenv = data;
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if (len > strn_pfenv->remain) {
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len = strn_pfenv->remain;
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}
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memcpy(strn_pfenv->cur, str, len);
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strn_pfenv->cur += len;
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strn_pfenv->remain -= len;
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}
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int snprintf(char *str, size_t size, const char *fmt, ...) {
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strn_pfenv_t strn_pfenv;
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strn_pfenv.cur = str;
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strn_pfenv.remain = size;
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pfenv_t pfenv;
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pfenv.data = &strn_pfenv;
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pfenv.print_strn = strn_print_strn;
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va_list args;
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va_start(args, fmt);
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int len = pfenv_printf(&pfenv, fmt, args);
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// add terminating null byte
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if (size > 0) {
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if (strn_pfenv.remain == 0) {
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strn_pfenv.cur[-1] = 0;
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} else {
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strn_pfenv.cur[0] = 0;
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}
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}
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return len;
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}
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