micropython: add micropython component

components/language/micropython/shared/libc/printf.c

@@ -0,0 +1,133 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2013, 2014 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "py/mpconfig.h"
+
+#include <stdint.h>
+#include <string.h>
+#include <stdarg.h>
+
+#include "py/obj.h"
+#include "py/mphal.h"
+
+#if MICROPY_PY_BUILTINS_FLOAT
+#include "py/formatfloat.h"
+#endif
+
+#if MICROPY_DEBUG_PRINTERS
+int DEBUG_printf(const char *fmt, ...) {
+    va_list ap;
+    va_start(ap, fmt);
+    int ret = mp_vprintf(MICROPY_DEBUG_PRINTER, fmt, ap);
+    va_end(ap);
+    return ret;
+}
+#endif
+
+#if MICROPY_USE_INTERNAL_PRINTF
+
+#undef putchar  // Some stdlibs have a #define for putchar
+int printf(const char *fmt, ...);
+int vprintf(const char *fmt, va_list ap);
+int putchar(int c);
+int puts(const char *s);
+int vsnprintf(char *str, size_t size, const char *fmt, va_list ap);
+int snprintf(char *str, size_t size, const char *fmt, ...);
+
+int printf(const char *fmt, ...) {
+    va_list ap;
+    va_start(ap, fmt);
+    int ret = mp_vprintf(&mp_plat_print, fmt, ap);
+    va_end(ap);
+    return ret;
+}
+
+int vprintf(const char *fmt, va_list ap) {
+    return mp_vprintf(&mp_plat_print, fmt, ap);
+}
+
+// need this because gcc optimises printf("%c", c) -> putchar(c), and printf("a") -> putchar('a')
+int putchar(int c) {
+    char chr = c;
+    mp_hal_stdout_tx_strn_cooked(&chr, 1);
+    return chr;
+}
+
+// need this because gcc optimises printf("string\n") -> puts("string")
+int puts(const char *s) {
+    mp_hal_stdout_tx_strn_cooked(s, strlen(s));
+    char chr = '\n';
+    mp_hal_stdout_tx_strn_cooked(&chr, 1);
+    return 1;
+}
+
+typedef struct _strn_print_env_t {
+    char *cur;
+    size_t remain;
+} strn_print_env_t;
+
+STATIC void strn_print_strn(void *data, const char *str, size_t len) {
+    strn_print_env_t *strn_print_env = data;
+    if (len > strn_print_env->remain) {
+        len = strn_print_env->remain;
+    }
+    memcpy(strn_print_env->cur, str, len);
+    strn_print_env->cur += len;
+    strn_print_env->remain -= len;
+}
+
+#if defined(__GNUC__) && !defined(__clang__) && __GNUC__ < 9
+// uClibc requires this alias to be defined, or there may be link errors
+// when linkings against it statically.
+// GCC 9 gives a warning about missing attributes so it's excluded until
+// uClibc+GCC9 support is needed.
+int __GI_vsnprintf(char *str, size_t size, const char *fmt, va_list ap) __attribute__((weak, alias("vsnprintf")));
+#endif
+
+int vsnprintf(char *str, size_t size, const char *fmt, va_list ap) {
+    strn_print_env_t strn_print_env = {str, size};
+    mp_print_t print = {&strn_print_env, strn_print_strn};
+    int len = mp_vprintf(&print, fmt, ap);
+    // add terminating null byte
+    if (size > 0) {
+        if (strn_print_env.remain == 0) {
+            strn_print_env.cur[-1] = 0;
+        } else {
+            strn_print_env.cur[0] = 0;
+        }
+    }
+    return len;
+}
+
+int snprintf(char *str, size_t size, const char *fmt, ...) {
+    va_list ap;
+    va_start(ap, fmt);
+    int ret = vsnprintf(str, size, fmt, ap);
+    va_end(ap);
+    return ret;
+}
+
+#endif // MICROPY_USE_INTERNAL_PRINTF