51 lines
1.3 KiB
C
51 lines
1.3 KiB
C
#include "stdio.h"
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#include "string.h"
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#include "drivers/shell.h"
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int printf(const char *format, ...) {
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char buf[20],c,*s;
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int val;
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int32_t uval;
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va_list ap;
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va_start(ap, format);
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for(size_t i = 0; i < strlen(format); i++) {
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if(format[i] == '%') {
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i++;
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while(format[i] == ' ')
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i++;
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switch(format[i]) {
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case 'i':
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val = va_arg(ap, int);
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itoa(val, buf, 10);
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printk(buf);
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break;
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case 'x':
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uval = va_arg(ap, uint32_t);
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uitoa(uval, buf, 16);
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printk(buf);
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break;
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case 'd':
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uval = va_arg(ap, uint32_t);
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uitoa(uval, buf, 10);
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printk(buf);
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break;
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case 'c':
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s = va_arg(ap, char*);
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printk_c(&c, 1);
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break;
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case 's':
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s = va_arg(ap, char*);
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printk(s);
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break;
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default:
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printk_c((char*)format+1, 1);
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}
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} else
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printk_c((char*)format+1, 1);
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}
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va_end(ap);
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return 0;
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} |