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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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32 | |||
33 | static char digits[] = "0123456789abcdef"; |
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34 | static spinlock_t printflock; |
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35 | |||
36 | void print_str(char *str) |
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37 | { |
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38 | int i = 0; |
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39 | char c; |
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40 | |||
41 | while (c = str[i++]) |
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42 | putchar(c); |
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43 | } |
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44 | |||
45 | |||
46 | /* |
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47 | * This is a universal function for printing hexadecimal numbers of fixed |
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48 | * width. |
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49 | */ |
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50 | void print_fixed_hex(__u32 num, int width) |
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51 | { |
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52 | int i; |
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53 | |||
54 | for (i = width*8 - 4; i >= 0; i -= 4) |
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55 | putchar(digits[(num>>i) & 0xf]); |
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56 | } |
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57 | |||
58 | /* |
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59 | * This is a universal function for printing decimal and hexadecimal numbers. |
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60 | * It prints only significant digits. |
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61 | */ |
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62 | void print_number(__u32 num, int base) |
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63 | { |
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64 | char d[32+1]; /* this is good enough even for base == 2 */ |
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65 | int i = 31; |
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66 | |||
67 | do { |
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68 | d[i--] = digits[num % base]; |
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69 | } while (num /= base); |
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70 | |||
71 | d[32] = 0; |
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72 | print_str(&d[i + 1]); |
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73 | } |
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74 | |||
75 | /* |
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76 | * This is our function for printing formatted text. |
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77 | * It's much simpler than the user-space one. |
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78 | * We are greateful for this function. |
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79 | */ |
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80 | void printf(char *fmt, ...) |
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81 | { |
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82 | int irqpri, i = 0, pos = 0; |
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83 | char c; |
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84 | |||
85 | irqpri = cpu_priority_high(); |
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86 | spinlock_lock(&printflock); |
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87 | while (c = fmt[i++]) { |
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88 | switch (c) { |
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89 | |||
90 | /* control character */ |
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91 | case '%': |
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92 | switch (c = fmt[i++]) { |
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93 | |||
94 | /* percentile itself */ |
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95 | case '%': |
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96 | break; |
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97 | |||
98 | /* |
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99 | * String and character conversions. |
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100 | */ |
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101 | case 's': |
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102 | print_str((char *) *(((__address *) &fmt + (++pos)))); |
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103 | goto loop; |
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104 | |||
105 | case 'c': |
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106 | c = *((char *) ((__address *)(&fmt + (++pos)))); |
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107 | break; |
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108 | |||
109 | /* |
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110 | * Hexadecimal conversions with fixed width. |
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111 | */ |
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112 | case 'L': |
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113 | print_str("0x"); |
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114 | case 'l': |
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115 | print_fixed_hex(*((__address *)(&fmt + (++pos))),INT32); |
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116 | goto loop; |
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117 | |||
118 | case 'W': |
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119 | print_str("0x"); |
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120 | case 'w': |
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121 | print_fixed_hex(*((__address *)(&fmt + (++pos))),INT16); |
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122 | goto loop; |
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123 | |||
124 | case 'B': |
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125 | print_str("0x"); |
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126 | case 'b': |
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127 | print_fixed_hex(*((__address *)(&fmt + (++pos))),INT8); |
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128 | goto loop; |
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129 | |||
130 | /* |
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131 | * Decimal and hexadecimal conversions. |
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132 | */ |
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133 | case 'd': |
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134 | print_number(*((__address *)(&fmt + (++pos))), 10); |
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135 | goto loop; |
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136 | |||
137 | case 'X': |
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138 | print_str("0x"); |
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139 | case 'x': |
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140 | print_number(*((__address *)(&fmt + (++pos))), 16); |
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141 | goto loop; |
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142 | |||
143 | /* |
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144 | * Bad formatting. |
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145 | */ |
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146 | default: |
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147 | goto out; |
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148 | } |
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149 | |||
150 | default: putchar(c); |
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151 | } |
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152 | |||
153 | loop: |
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154 | ; |
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155 | } |
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156 | |||
157 | out: |
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158 | spinlock_unlock(&printflock); |
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159 | cpu_priority_restore(irqpri); |
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160 | } |