[libc] implement extension standard C functions (#6044)

* implement extension standard C functions

1 files changed, 144 insertions, 0 deletions

diff --git a/components/libc/compilers/common/cstdlib.c b/components/libc/compilers/common/cstdlib.c
new file mode 100644
index 0000000000..9d1667b5d3
--- /dev/null
+++ b/components/libc/compilers/common/cstdlib.c
@@ -0,0 +1,144 @@
+/*
+ * Copyright (c) 2006-2022, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2021-02-15     Meco Man     first version
+ */
+
+#include <rtthread.h>
+
+#define DBG_TAG    "stdlib"
+#define DBG_LVL    DBG_INFO
+#include <rtdbg.h>
+
+void __rt_libc_exit(int status)
+{
+    rt_thread_t self = rt_thread_self();
+
+    if (self != RT_NULL)
+    {
+#ifdef RT_USING_PTHREADS
+        extern void pthread_exit(void *value);
+        pthread_exit((void *)status);
+#else
+        LOG_E("thread:%s exit:%d!", self->name, status);
+        rt_thread_control(self, RT_THREAD_CTRL_CLOSE, RT_NULL);
+#endif
+    }
+}
+
+#ifdef RT_USING_MSH
+int system(const char *command)
+{
+    extern int msh_exec(char *cmd, rt_size_t length);
+
+    if (command)
+    {
+        msh_exec((char *)command, rt_strlen(command));
+    }
+
+    return 0;
+}
+RTM_EXPORT(system);
+#endif /* RT_USING_MSH */
+
+char *ltoa(long value, char *string, int radix)
+{
+    char tmp[33];
+    char *tp = tmp;
+    long i;
+    unsigned long v;
+    int sign;
+    char *sp;
+
+    if (string == NULL)
+    {
+        return 0 ;
+    }
+
+    if (radix > 36 || radix <= 1)
+    {
+        return 0 ;
+    }
+
+    sign = (radix == 10 && value < 0);
+    if (sign)
+    {
+        v = -value;
+    }
+    else
+    {
+        v = (unsigned long)value;
+    }
+
+    while (v || tp == tmp)
+    {
+        i = v % radix;
+        v = v / radix;
+        if (i < 10)
+            *tp++ = i+'0';
+        else
+            *tp++ = i + 'a' - 10;
+    }
+
+    sp = string;
+
+    if (sign)
+        *sp++ = '-';
+    while (tp > tmp)
+        *sp++ = *--tp;
+    *sp = 0;
+
+    return string;
+}
+
+char *itoa(int value, char *string, int radix)
+{
+    return ltoa(value, string, radix) ;
+}
+
+
+char *ultoa(unsigned long value, char *string, int radix)
+{
+    char tmp[33];
+    char *tp = tmp;
+    long i;
+    unsigned long v = value;
+    char *sp;
+
+    if (string == NULL)
+    {
+        return 0;
+    }
+
+    if (radix > 36 || radix <= 1)
+    {
+        return 0;
+    }
+
+    while (v || tp == tmp)
+    {
+        i = v % radix;
+        v = v / radix;
+        if (i < 10)
+            *tp++ = i+'0';
+        else
+            *tp++ = i + 'a' - 10;
+    }
+
+    sp = string;
+
+    while (tp > tmp)
+        *sp++ = *--tp;
+    *sp = 0;
+
+    return string;
+}
+
+char *utoa(unsigned value, char *string, int radix)
+{
+    return ultoa(value, string, radix) ;
+}