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1 | jermar | 1 | /* |
2 | * Copyright (C) 2001-2004 Jakub Jermar |
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3 | * All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * |
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9 | * - Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * - Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * - The name of the author may not be used to endorse or promote products |
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15 | * derived from this software without specific prior written permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |||
29 | #include <putchar.h> |
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30 | #include <print.h> |
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31 | #include <synch/spinlock.h> |
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40 | jermar | 32 | #include <arch/arg.h> |
1 | jermar | 33 | |
40 | jermar | 34 | |
1 | jermar | 35 | static char digits[] = "0123456789abcdef"; |
36 | static spinlock_t printflock; |
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37 | |||
38 | void print_str(char *str) |
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39 | { |
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40 | int i = 0; |
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41 | char c; |
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42 | |||
43 | while (c = str[i++]) |
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44 | putchar(c); |
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45 | } |
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46 | |||
47 | |||
48 | /* |
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49 | * This is a universal function for printing hexadecimal numbers of fixed |
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50 | * width. |
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51 | */ |
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52 | void print_fixed_hex(__u32 num, int width) |
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53 | { |
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54 | int i; |
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55 | |||
56 | for (i = width*8 - 4; i >= 0; i -= 4) |
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57 | putchar(digits[(num>>i) & 0xf]); |
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58 | } |
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59 | |||
60 | /* |
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61 | * This is a universal function for printing decimal and hexadecimal numbers. |
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62 | * It prints only significant digits. |
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63 | */ |
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64 | void print_number(__u32 num, int base) |
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65 | { |
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66 | char d[32+1]; /* this is good enough even for base == 2 */ |
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67 | int i = 31; |
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68 | |||
69 | do { |
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70 | d[i--] = digits[num % base]; |
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71 | } while (num /= base); |
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72 | |||
73 | d[32] = 0; |
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74 | print_str(&d[i + 1]); |
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75 | } |
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76 | |||
77 | /* |
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78 | * This is our function for printing formatted text. |
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79 | * It's much simpler than the user-space one. |
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80 | * We are greateful for this function. |
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81 | */ |
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82 | void printf(char *fmt, ...) |
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83 | { |
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40 | jermar | 84 | int irqpri, i = 0; |
85 | va_list ap; |
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86 | char c; |
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1 | jermar | 87 | |
40 | jermar | 88 | va_start(ap, fmt); |
89 | |||
1 | jermar | 90 | irqpri = cpu_priority_high(); |
91 | spinlock_lock(&printflock); |
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40 | jermar | 92 | |
1 | jermar | 93 | while (c = fmt[i++]) { |
94 | switch (c) { |
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95 | |||
96 | /* control character */ |
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97 | case '%': |
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98 | switch (c = fmt[i++]) { |
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99 | |||
100 | /* percentile itself */ |
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101 | case '%': |
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102 | break; |
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103 | |||
104 | /* |
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105 | * String and character conversions. |
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106 | */ |
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107 | case 's': |
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40 | jermar | 108 | print_str(va_arg(ap, char_ptr)); |
1 | jermar | 109 | goto loop; |
110 | |||
111 | case 'c': |
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40 | jermar | 112 | c = va_arg(ap, char); |
1 | jermar | 113 | break; |
114 | |||
115 | /* |
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116 | * Hexadecimal conversions with fixed width. |
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117 | */ |
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118 | case 'L': |
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119 | print_str("0x"); |
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120 | case 'l': |
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40 | jermar | 121 | print_fixed_hex(va_arg(ap, __native), INT32); |
1 | jermar | 122 | goto loop; |
123 | |||
124 | case 'W': |
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125 | print_str("0x"); |
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126 | case 'w': |
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40 | jermar | 127 | print_fixed_hex(va_arg(ap, __native), INT16); |
1 | jermar | 128 | goto loop; |
129 | |||
130 | case 'B': |
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131 | print_str("0x"); |
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132 | case 'b': |
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40 | jermar | 133 | print_fixed_hex(va_arg(ap, __native), INT8); |
1 | jermar | 134 | goto loop; |
135 | |||
136 | /* |
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137 | * Decimal and hexadecimal conversions. |
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138 | */ |
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139 | case 'd': |
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40 | jermar | 140 | print_number(va_arg(ap, __native), 10); |
1 | jermar | 141 | goto loop; |
142 | |||
143 | case 'X': |
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144 | print_str("0x"); |
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145 | case 'x': |
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40 | jermar | 146 | print_number(va_arg(ap, __native), 16); |
1 | jermar | 147 | goto loop; |
148 | |||
149 | /* |
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150 | * Bad formatting. |
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151 | */ |
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152 | default: |
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153 | goto out; |
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154 | } |
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155 | |||
156 | default: putchar(c); |
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157 | } |
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158 | |||
159 | loop: |
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160 | ; |
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161 | } |
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162 | |||
163 | out: |
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164 | spinlock_unlock(&printflock); |
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165 | cpu_priority_restore(irqpri); |
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40 | jermar | 166 | |
167 | va_end(ap); |
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1 | jermar | 168 | } |