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65 lines
1.2 KiB
65 lines
1.2 KiB
1 year ago
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#include "c_type51.h"
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#include "c_lib.h"
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///#include "../msp/msp_uart0.h"
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////#include "../msp/time.h"
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#include <stdarg.h>
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#if 0
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///int print_withoutbuf(const char *format, ...);
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//va_start(arg,format),初始化参数指针arg，将函数参数format右边第一个参数地址赋值给arg
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//format必须是一个参数的指针，所以，此种类型函数至少要有一个普通的参数,
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//从而提供给va_start ,这样va_start才能找到可变参数在栈上的位置。
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//va_arg(arg,char),获得arg指向参数的值，同时使arg指向下一个参数,char用来指名当前参数型
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//va_end 在有些实现中可能会把arg改成无效值，这里，是把arg指针指向了 NULL,避免出现野指针
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void print_withoutbuf(const char *format, ...)
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{
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va_listcc arg;
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va_start(arg, format);
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while (*format)
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{
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char ret = *format;
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if (ret == '%')
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{
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switch (*++format)
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{
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case 'c':
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{
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char ch = va_arg(arg, char);
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/// putchar(ch);
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break;
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}
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case 's':
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{
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char *pc = va_arg(arg, char *);
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while (*pc)
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{
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/// putchar(*pc);
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pc++;
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}
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break;
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}
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default:
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break;
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}
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}
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else
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{
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putchar(*format);
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}
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format++;
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}
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va_end(arg);
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}
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#endif
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