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1 #include "types.h"
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2 #include "stat.h"
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3 #include "user.h"
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21
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4 #include <stdarg.h>
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0
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5
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6 static void
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7 putc(int fd, char c)
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8 {
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9 write(fd, &c, 1);
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10 }
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11
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12 static void
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13 printint(int fd, int xx, int base, int sgn)
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14 {
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15 static char digits[] = "0123456789ABCDEF";
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16 char buf[16];
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17 int i, neg;
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18 uint x;
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19
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20 neg = 0;
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21 if(sgn && xx < 0){
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22 neg = 1;
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23 x = -xx;
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24 } else {
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25 x = xx;
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26 }
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27
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28 i = 0;
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29 do{
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30 buf[i++] = digits[x % base];
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31 }while((x /= base) != 0);
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32 if(neg)
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33 buf[i++] = '-';
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34
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35 while(--i >= 0)
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36 putc(fd, buf[i]);
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37 }
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38
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39 // Print to the given fd. Only understands %d, %x, %p, %s.
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40 void
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41 printf(int fd, char *fmt, ...)
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42 {
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43 char *s;
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44 int c, i, state;
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45 va_list ap;
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46
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47 state = 0;
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48 va_start(ap, fmt);
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49 for(i = 0; fmt[i]; i++){
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50 c = fmt[i] & 0xff;
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51 if(state == 0){
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52 if(c == '%'){
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53 state = '%';
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54 } else {
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55 putc(fd, c);
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56 }
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57 } else if(state == '%'){
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58 if(c == 'd'){
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59 printint(fd, va_arg(ap,int), 10, 1);
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60 } else if(c == 'x' || c == 'p'){
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61 printint(fd, va_arg(ap,int), 16, 0);
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62 } else if(c == 's'){
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63 s = va_arg(ap,char*);
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64 if(s == 0)
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65 s = "(null)";
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66 while(*s != 0){
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67 putc(fd, *s);
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68 s++;
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69 }
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70 } else if(c == 'c'){
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71 putc(fd, va_arg(ap,int));
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72 } else if(c == '%'){
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73 putc(fd, c);
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74 } else {
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75 // Unknown % sequence. Print it to draw attention.
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76 putc(fd, '%');
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77 putc(fd, c);
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78 }
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79 state = 0;
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80 }
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81 }
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82 va_end(ap);
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83 }
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