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974 | cejka | 1 | /* |
2 | * Copyright (C) 2001-2004 Jakub Jermar |
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3 | * Copyright (C) 2006 Josef Cejka |
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4 | * All rights reserved. |
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5 | * |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions |
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8 | * are met: |
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9 | * |
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10 | * - Redistributions of source code must retain the above copyright |
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11 | * notice, this list of conditions and the following disclaimer. |
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12 | * - Redistributions in binary form must reproduce the above copyright |
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13 | * notice, this list of conditions and the following disclaimer in the |
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14 | * documentation and/or other materials provided with the distribution. |
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15 | * - The name of the author may not be used to endorse or promote products |
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16 | * derived from this software without specific prior written permission. |
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17 | * |
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18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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28 | */ |
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29 | |||
30 | #include <stdio.h> |
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31 | #include <unistd.h> |
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32 | #include <io/io.h> |
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33 | #include <stdarg.h> |
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34 | |||
1073 | cejka | 35 | #define __PRINTF_FLAG_PREFIX 0x00000001 /* show prefixes 0x or 0*/ |
36 | #define __PRINTF_FLAG_SIGNED 0x00000002 /* signed / unsigned number */ |
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37 | #define __PRINTF_FLAG_ZEROPADDED 0x00000004 /* print leading zeroes */ |
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38 | #define __PRINTF_FLAG_LEFTALIGNED 0x00000010 /* align to left */ |
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39 | #define __PRINTF_FLAG_SHOWPLUS 0x00000020 /* always show + sign */ |
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40 | #define __PRINTF_FLAG_SPACESIGN 0x00000040 /* print space instead of plus */ |
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41 | #define __PRINTF_FLAG_BIGCHARS 0x00000080 /* show big characters */ |
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42 | #define __PRINTF_FLAG_NEGATIVE 0x00000100 /* number has - sign */ |
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995 | cejka | 43 | |
1073 | cejka | 44 | #define PRINT_NUMBER_BUFFER_SIZE (64+5) /* Buffer big enought for 64 bit number |
45 | * printed in base 2, sign, prefix and |
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46 | * 0 to terminate string.. (last one is only for better testing |
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47 | * end of buffer by zero-filling subroutine) |
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48 | */ |
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49 | typedef enum { |
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50 | PrintfQualifierByte = 0, |
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51 | PrintfQualifierShort, |
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52 | PrintfQualifierInt, |
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53 | PrintfQualifierLong, |
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54 | PrintfQualifierLongLong, |
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55 | PrintfQualifierSizeT, |
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56 | PrintfQualifierPointer |
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57 | } qualifier_t; |
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974 | cejka | 58 | |
1073 | cejka | 59 | static char digits_small[] = "0123456789abcdef"; /* Small hexadecimal characters */ |
60 | static char digits_big[] = "0123456789ABCDEF"; /* Big hexadecimal characters */ |
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995 | cejka | 61 | |
974 | cejka | 62 | /** Print number in given base |
63 | * |
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64 | * Print significant digits of a number in given |
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65 | * base. |
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66 | * |
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67 | * @param num Number to print. |
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1073 | cejka | 68 | * @param size not used, in future releases will be replaced with precision and width params |
974 | cejka | 69 | * @param base Base to print the number in (should |
70 | * be in range 2 .. 16). |
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1073 | cejka | 71 | * @param flags output modifiers |
72 | * @return number of written characters or EOF |
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974 | cejka | 73 | * |
74 | */ |
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1073 | cejka | 75 | static int print_number(uint64_t num, size_t size, int base , uint64_t flags) |
974 | cejka | 76 | { |
1073 | cejka | 77 | /* FIXME: This is only first version. |
78 | * Printf does not have support for specification of size |
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79 | * and precision, so this function writes with parameters defined by |
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80 | * their type size. |
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81 | */ |
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82 | char *digits = digits_small; |
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83 | char d[PRINT_NUMBER_BUFFER_SIZE]; /* this is good enough even for base == 2, prefix and sign */ |
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84 | char *ptr = &d[PRINT_NUMBER_BUFFER_SIZE - 1]; |
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974 | cejka | 85 | |
1073 | cejka | 86 | if (flags & __PRINTF_FLAG_BIGCHARS) |
87 | digits = digits_big; |
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995 | cejka | 88 | |
1073 | cejka | 89 | *ptr-- = 0; /* Put zero at end of string */ |
90 | |||
91 | if (num == 0) { |
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92 | *ptr-- = '0'; |
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93 | } else { |
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94 | do { |
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95 | *ptr-- = digits[num % base]; |
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96 | } while (num /= base); |
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97 | } |
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98 | if (flags & __PRINTF_FLAG_PREFIX) { /*FIXME*/ |
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99 | switch(base) { |
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100 | case 2: /* Binary formating is not standard, but usefull */ |
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101 | *ptr = 'b'; |
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102 | if (flags & __PRINTF_FLAG_BIGCHARS) *ptr = 'B'; |
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103 | ptr--; |
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104 | *ptr-- = '0'; |
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105 | break; |
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106 | case 8: |
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107 | *ptr-- = 'o'; |
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108 | break; |
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109 | case 16: |
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110 | *ptr = 'x'; |
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111 | if (flags & __PRINTF_FLAG_BIGCHARS) *ptr = 'X'; |
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112 | ptr--; |
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113 | *ptr-- = '0'; |
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114 | break; |
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115 | } |
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116 | } |
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974 | cejka | 117 | |
1073 | cejka | 118 | if (flags & __PRINTF_FLAG_SIGNED) { |
119 | if (flags & __PRINTF_FLAG_NEGATIVE) { |
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120 | *ptr-- = '-'; |
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121 | } else if (flags & __PRINTF_FLAG_SHOWPLUS) { |
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122 | *ptr-- = '+'; |
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123 | } else if (flags & __PRINTF_FLAG_SPACESIGN) { |
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124 | *ptr-- = ' '; |
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125 | } |
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126 | } |
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974 | cejka | 127 | |
1073 | cejka | 128 | /* Print leading zeroes */ |
129 | |||
130 | if (flags & __PRINTF_FLAG_LEFTALIGNED) { |
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131 | flags &= ~__PRINTF_FLAG_ZEROPADDED; |
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132 | } |
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133 | if (flags & __PRINTF_FLAG_ZEROPADDED) { |
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134 | while (ptr != d ) { |
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135 | *ptr-- = '0'; |
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136 | } |
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137 | } |
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138 | |||
139 | return putstr(++ptr); |
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974 | cejka | 140 | } |
141 | |||
142 | |||
143 | |||
144 | /** General formatted text print |
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145 | * |
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146 | * Print text formatted according the fmt parameter |
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147 | * and variant arguments. Each formatting directive |
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148 | * begins with \% (percentage) character and one of the |
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149 | * following character: |
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150 | * |
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151 | * \% Prints the percentage character. |
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152 | * |
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153 | * s The next variant argument is treated as char* |
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154 | * and printed as a NULL terminated string. |
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155 | * |
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156 | * c The next variant argument is treated as a single char. |
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157 | * |
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158 | * p The next variant argument is treated as a maximum |
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159 | * bit-width integer with respect to architecture |
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160 | * and printed in full hexadecimal width. |
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161 | * |
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162 | * P As with 'p', but '0x' is prefixed. |
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163 | * |
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164 | * q The next variant argument is treated as a 64b integer |
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165 | * and printed in full hexadecimal width. |
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166 | * |
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167 | * Q As with 'q', but '0x' is prefixed. |
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168 | * |
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169 | * l The next variant argument is treated as a 32b integer |
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170 | * and printed in full hexadecimal width. |
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171 | * |
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172 | * L As with 'l', but '0x' is prefixed. |
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173 | * |
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174 | * w The next variant argument is treated as a 16b integer |
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175 | * and printed in full hexadecimal width. |
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176 | * |
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177 | * W As with 'w', but '0x' is prefixed. |
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178 | * |
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179 | * b The next variant argument is treated as a 8b integer |
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180 | * and printed in full hexadecimal width. |
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181 | * |
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182 | * B As with 'b', but '0x' is prefixed. |
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183 | * |
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184 | * d The next variant argument is treated as integer |
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185 | * and printed in standard decimal format (only significant |
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186 | * digits). |
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187 | * |
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188 | * x The next variant argument is treated as integer |
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189 | * and printed in standard hexadecimal format (only significant |
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190 | * digits). |
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191 | * |
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192 | * X As with 'x', but '0x' is prefixed. |
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193 | * |
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194 | * All other characters from fmt except the formatting directives |
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195 | * are printed in verbatim. |
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196 | * |
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197 | * @param fmt Formatting NULL terminated string. |
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198 | */ |
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199 | int printf(const char *fmt, ...) |
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200 | { |
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1073 | cejka | 201 | int i = 0, j = 0; /* i is index of currently processed char from fmt, j is index to the first not printed nonformating character */ |
202 | int end; |
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203 | int counter; /* counter of printed characters */ |
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204 | int retval; /* used to store return values from called functions */ |
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974 | cejka | 205 | va_list ap; |
1073 | cejka | 206 | char c; |
207 | qualifier_t qualifier; /* type of argument */ |
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208 | int base; /* base in which will be parameter (numbers only) printed */ |
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209 | uint64_t number; /* argument value */ |
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210 | size_t size; /* byte size of integer parameter */ |
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995 | cejka | 211 | uint64_t flags; |
974 | cejka | 212 | |
213 | counter = 0; |
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214 | va_start(ap, fmt); |
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215 | |||
216 | while ((c = fmt[i])) { |
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992 | jermar | 217 | /* control character */ |
974 | cejka | 218 | if (c == '%' ) { |
992 | jermar | 219 | /* print common characters if any processed */ |
974 | cejka | 220 | if (i > j) { |
995 | cejka | 221 | if ((retval = putnchars(&fmt[j], (size_t)(i - j))) == EOF) { /* error */ |
974 | cejka | 222 | return -counter; |
223 | } |
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224 | counter += retval; |
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225 | } |
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1073 | cejka | 226 | |
227 | j = i; |
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995 | cejka | 228 | /* parse modifiers */ |
229 | flags = 0; |
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1073 | cejka | 230 | end = 0; |
231 | |||
232 | do { |
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233 | ++i; |
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234 | switch (c = fmt[i]) { |
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235 | case '#': flags |= __PRINTF_FLAG_PREFIX; break; |
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236 | case '-': flags |= __PRINTF_FLAG_LEFTALIGNED; break; |
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237 | case '+': flags |= __PRINTF_FLAG_SHOWPLUS; break; |
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238 | case ' ': flags |= __PRINTF_FLAG_SPACESIGN; break; |
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239 | case '0': flags |= __PRINTF_FLAG_ZEROPADDED; break; |
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240 | default: end = 1; |
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241 | }; |
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242 | |||
243 | } while (end == 0); |
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244 | /* TODO: width & '*' operator */ |
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245 | /* TODO: precision and '*' operator */ |
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246 | |||
247 | switch (fmt[i++]) { |
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248 | case 'h': /* char or short */ |
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249 | qualifier = PrintfQualifierShort; |
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250 | if (fmt[i] == 'h') { |
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251 | i++; |
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252 | qualifier = PrintfQualifierByte; |
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253 | } |
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254 | break; |
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255 | case 'l': /* long or long long*/ |
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256 | qualifier = PrintfQualifierLong; |
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257 | if (fmt[i] == 'l') { |
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258 | i++; |
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259 | qualifier = PrintfQualifierLongLong; |
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260 | } |
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261 | break; |
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262 | case 'z': /* size_t */ |
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263 | qualifier = PrintfQualifierSizeT; |
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264 | break; |
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265 | default: |
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266 | qualifier = PrintfQualifierInt; /* default type */ |
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267 | --i; |
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995 | cejka | 268 | } |
1073 | cejka | 269 | |
270 | base = 10; |
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271 | |||
974 | cejka | 272 | switch (c = fmt[i]) { |
273 | |||
274 | /* |
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275 | * String and character conversions. |
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276 | */ |
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277 | case 's': |
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278 | if ((retval = putstr(va_arg(ap, char*))) == EOF) { |
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279 | return -counter; |
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280 | }; |
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281 | |||
282 | counter += retval; |
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1073 | cejka | 283 | j = i + 1; |
284 | goto next_char; |
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974 | cejka | 285 | case 'c': |
1010 | cejka | 286 | c = va_arg(ap, unsigned long); |
287 | if ((retval = putnchars(&c, sizeof(char))) == EOF) { |
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974 | cejka | 288 | return -counter; |
289 | }; |
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290 | |||
291 | counter += retval; |
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1073 | cejka | 292 | j = i + 1; |
293 | goto next_char; |
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974 | cejka | 294 | |
1073 | cejka | 295 | /* |
296 | * Integer values |
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974 | cejka | 297 | */ |
1073 | cejka | 298 | case 'P': /* pointer */ |
299 | flags |= __PRINTF_FLAG_BIGCHARS; |
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974 | cejka | 300 | case 'p': |
1073 | cejka | 301 | flags |= __PRINTF_FLAG_PREFIX; |
302 | base = 16; |
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303 | qualifier = PrintfQualifierPointer; |
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304 | break; |
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305 | case 'b': |
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306 | base = 2; |
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974 | cejka | 307 | break; |
1073 | cejka | 308 | case 'o': |
309 | base = 8; |
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974 | cejka | 310 | break; |
311 | case 'd': |
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995 | cejka | 312 | case 'i': |
1073 | cejka | 313 | flags |= __PRINTF_FLAG_SIGNED; |
314 | case 'u': |
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315 | break; |
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974 | cejka | 316 | case 'X': |
1073 | cejka | 317 | flags |= __PRINTF_FLAG_BIGCHARS; |
974 | cejka | 318 | case 'x': |
1073 | cejka | 319 | base = 16; |
320 | break; |
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321 | /* percentile itself */ |
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322 | case '%': |
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323 | j = i; |
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324 | goto next_char; |
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974 | cejka | 325 | /* |
326 | * Bad formatting. |
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327 | */ |
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328 | default: |
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1073 | cejka | 329 | /* Unknown format |
330 | * now, the j is index of '%' so we will |
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331 | * print whole bad format sequence |
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332 | */ |
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333 | goto next_char; |
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334 | } |
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335 | |||
336 | |||
337 | /* Print integers */ |
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338 | /* print number */ |
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339 | switch (qualifier) { |
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340 | case PrintfQualifierByte: |
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341 | size = sizeof(unsigned char); |
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342 | number = (uint64_t)va_arg(ap, unsigned int); |
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343 | break; |
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344 | case PrintfQualifierShort: |
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345 | size = sizeof(unsigned short); |
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346 | number = (uint64_t)va_arg(ap, unsigned int); |
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347 | break; |
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348 | case PrintfQualifierInt: |
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349 | size = sizeof(unsigned int); |
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350 | number = (uint64_t)va_arg(ap, unsigned int); |
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351 | break; |
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352 | case PrintfQualifierLong: |
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353 | size = sizeof(unsigned long); |
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354 | number = (uint64_t)va_arg(ap, unsigned long); |
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355 | break; |
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356 | case PrintfQualifierLongLong: |
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357 | size = sizeof(unsigned long long); |
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358 | number = (uint64_t)va_arg(ap, unsigned long long); |
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359 | break; |
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360 | case PrintfQualifierPointer: |
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361 | size = sizeof(void *); |
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362 | number = (uint64_t)(unsigned long)va_arg(ap, void *); |
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363 | break; |
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364 | case PrintfQualifierSizeT: |
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365 | size = sizeof(size_t); |
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366 | number = (uint64_t)va_arg(ap, size_t); |
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367 | break; |
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368 | default: /* Unknown qualifier */ |
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974 | cejka | 369 | return -counter; |
1073 | cejka | 370 | |
974 | cejka | 371 | } |
1073 | cejka | 372 | |
373 | if (flags & __PRINTF_FLAG_SIGNED) { |
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374 | if (number & (0x1 << (size*8 - 1))) { |
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375 | flags |= __PRINTF_FLAG_NEGATIVE; |
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376 | |||
377 | if (size == sizeof(uint64_t)) { |
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378 | number = -((int64_t)number); |
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379 | } else { |
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380 | number = ~number; |
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381 | number &= (~((0xFFFFFFFFFFFFFFFFll) << (size * 8))); |
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382 | number++; |
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383 | } |
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384 | } |
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385 | } |
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386 | |||
387 | if ((retval = print_number(number, size, base, flags)) == EOF ) { |
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388 | return -counter; |
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389 | }; |
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390 | |||
391 | counter += retval; |
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392 | j = i + 1; |
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974 | cejka | 393 | } |
1073 | cejka | 394 | next_char: |
395 | |||
974 | cejka | 396 | ++i; |
397 | } |
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398 | |||
975 | cejka | 399 | if (i > j) { |
995 | cejka | 400 | if ((retval = putnchars(&fmt[j], (size_t)(i - j))) == EOF) { /* error */ |
975 | cejka | 401 | return -counter; |
402 | } |
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403 | counter += retval; |
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404 | } |
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405 | |||
974 | cejka | 406 | va_end(ap); |
407 | return counter; |
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408 | } |
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409 |