diff options
Diffstat (limited to 'os/various/chprintf.c')
| -rw-r--r-- | os/various/chprintf.c | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/os/various/chprintf.c b/os/various/chprintf.c new file mode 100644 index 000000000..1645cd678 --- /dev/null +++ b/os/various/chprintf.c @@ -0,0 +1,206 @@ +/*
+ ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
+ 2011 Giovanni Di Sirio.
+
+ This file is part of ChibiOS/RT.
+
+ ChibiOS/RT is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ ChibiOS/RT is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdarg.h>
+
+#include "ch.h"
+
+#define MAX_FILLER 11
+
+static char *ltoa(char *p, long num, unsigned radix) {
+ int i;
+ char *q;
+
+ q = p + MAX_FILLER;
+ do {
+ i = (int)(num % radix);
+ i += '0';
+ if (i > '9')
+ i += 'A' - '0' - 10;
+ *--q = i;
+ } while ((num /= radix) != 0);
+
+ i = (int)(p + MAX_FILLER - q);
+ do
+ *p++ = *q++;
+ while (--i);
+
+ return p;
+}
+
+/**
+ * @brief System formatted output function.
+ * @details This function implements a minimal @p printf() like functionality
+ * with output on a @p BaseChannel.
+ * The general parameters format is: %[.][width|*][l|L]p.
+ * The following parameter types (p) are supported:
+ * - <b>x</b> hexadecimal integer.
+ * - <b>X</b> hexadecimal long.
+ * - <b>o</b> octal integer.
+ * - <b>O</b> octal long.
+ * - <b>d</b> decimal signed integer.
+ * - <b>D</b> decimal signed long.
+ * - <b>u</b> decimal unsigned integer.
+ * - <b>U</b> decimal unsigned long.
+ * - <b>c</b> character.
+ * - <b>s</b> string.
+ * .
+ * @note Floating point types are not implemented, this function is meant
+ * as a system utility and not a full implementation.
+ *
+ * @param[in] chp pointer to a @p BaseChannel implementing object
+ * @param[in] fmt formatting string
+ */
+void chprintf(BaseChannel *chp, const char *fmt, ...) {
+ va_list ap;
+ char buf[MAX_FILLER + 1];
+ char *p, *s, c, filler;
+ int i, n, width;
+ bool_t lflag, ljust;
+ long l;
+
+ va_start(ap, fmt);
+ while (TRUE) {
+ c = *fmt++;
+ if (c == 0) {
+ va_end(ap);
+ return;
+ }
+ if (c != '%') {
+ chIOPut(chp, (uint8_t)c);
+ continue;
+ }
+ p = buf;
+ s = buf;
+ ljust = FALSE;
+ if (*fmt == '-') {
+ fmt++;
+ ljust = TRUE;
+ }
+ filler = ' ';
+ if (*fmt == '.') {
+ fmt++;
+ filler = '0';
+ }
+ for (width = 0;;) {
+ c = *fmt++;
+ if (c >= '0' && c <= '9')
+ c -= '0';
+ else if (c == '*')
+ c = va_arg(ap, int);
+ else
+ break;
+ width = width * 10 + c;
+ }
+ n = 0;
+ if (c == '.') {
+ for (;;) {
+ c = *fmt++;
+ if (c >= '0' && c <= '9')
+ c -= '0';
+ else if (c == '*')
+ c = va_arg(ap, int);
+ else
+ break;
+ n *= 10;
+ n += c;
+ }
+ }
+ lflag = FALSE;
+ if (c == 'l' || c == 'L') {
+ lflag++;
+ if (*fmt)
+ c = *fmt++;
+ }
+ switch (c) {
+ case 'X':
+ lflag = TRUE;
+ case 'x':
+ c = 16;
+ goto oxu;
+ case 'U':
+ lflag = TRUE;
+ case 'u':
+ c = 10;
+ goto oxu;
+ case 'O':
+ lflag = TRUE;
+ case 'o':
+ c = 8;
+oxu:
+ if (lflag)
+ l = va_arg(ap, long);
+ else
+ l = va_arg(ap, int);
+ p = ltoa(p, l, c);
+ break;
+ case 'D':
+ lflag = TRUE;
+ case 'd':
+ if (lflag)
+ l = va_arg(ap, long);
+ else
+ l = va_arg(ap, int);
+ if (l < 0) {
+ *p++ = '-';
+ l = -l;
+ }
+ p = ltoa(p, l, 10);
+ break;
+ case 'c':
+ filler = ' ';
+ *p++ = va_arg(ap, int);
+ break;
+ case 's':
+ filler = ' ';
+ if ((s = va_arg(ap, char *)) == 0)
+ s = "(null)";
+ if (n == 0)
+ n = 32767;
+ for (p = s; *p && --n >= 0; p++)
+ ;
+ break;
+ default:
+ *p++ = c;
+ break;
+ }
+ i = (int)(p - s);
+ if ((width -= i) < 0)
+ width = 0;
+ if (ljust == FALSE)
+ width = -width;
+ if (width < 0) {
+ if (*s == '-' && filler == '0') {
+ chIOPut(chp, (uint8_t)*s++);
+ i--;
+ }
+ do
+ chIOPut(chp, (uint8_t)filler);
+ while (++width != 0);
+ }
+ while (--i >= 0)
+ chIOPut(chp, (uint8_t)*s++);
+
+ while (width) {
+ chIOPut(chp, (uint8_t)filler);
+ width--;
+ }
+ }
+}
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