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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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1173 | cejka | 34 | #include <ctype.h> |
35 | #include <string.h> |
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974 | cejka | 36 | |
1073 | cejka | 37 | #define __PRINTF_FLAG_PREFIX 0x00000001 /* show prefixes 0x or 0*/ |
38 | #define __PRINTF_FLAG_SIGNED 0x00000002 /* signed / unsigned number */ |
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39 | #define __PRINTF_FLAG_ZEROPADDED 0x00000004 /* print leading zeroes */ |
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40 | #define __PRINTF_FLAG_LEFTALIGNED 0x00000010 /* align to left */ |
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41 | #define __PRINTF_FLAG_SHOWPLUS 0x00000020 /* always show + sign */ |
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42 | #define __PRINTF_FLAG_SPACESIGN 0x00000040 /* print space instead of plus */ |
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43 | #define __PRINTF_FLAG_BIGCHARS 0x00000080 /* show big characters */ |
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44 | #define __PRINTF_FLAG_NEGATIVE 0x00000100 /* number has - sign */ |
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995 | cejka | 45 | |
1073 | cejka | 46 | #define PRINT_NUMBER_BUFFER_SIZE (64+5) /* Buffer big enought for 64 bit number |
47 | * printed in base 2, sign, prefix and |
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48 | * 0 to terminate string.. (last one is only for better testing |
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49 | * end of buffer by zero-filling subroutine) |
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50 | */ |
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51 | typedef enum { |
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52 | PrintfQualifierByte = 0, |
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53 | PrintfQualifierShort, |
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54 | PrintfQualifierInt, |
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55 | PrintfQualifierLong, |
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56 | PrintfQualifierLongLong, |
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57 | PrintfQualifierSizeT, |
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58 | PrintfQualifierPointer |
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59 | } qualifier_t; |
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974 | cejka | 60 | |
1073 | cejka | 61 | static char digits_small[] = "0123456789abcdef"; /* Small hexadecimal characters */ |
62 | static char digits_big[] = "0123456789ABCDEF"; /* Big hexadecimal characters */ |
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995 | cejka | 63 | |
1173 | cejka | 64 | |
65 | /** Print one formatted character |
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66 | * @param c character to print |
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67 | * @param width |
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68 | * @param flags |
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69 | * @return number of printed characters or EOF |
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70 | */ |
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71 | |||
72 | static int print_char(char c, int width, uint64_t flags) |
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73 | { |
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74 | int counter = 0; |
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75 | char space = ' '; |
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76 | |||
77 | if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) { |
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78 | while (--width > 0) { /* one space is consumed by character itself hence predecrement */ |
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79 | /* FIXME: painful slow */ |
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80 | putchar(' '); |
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81 | ++counter; |
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82 | } |
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83 | } |
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84 | |||
85 | if (putchar(c) == EOF) { |
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86 | return EOF; |
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87 | } |
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88 | |||
89 | while (--width > 0) { /* one space is consumed by character itself hence predecrement */ |
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90 | putchar(' '); |
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91 | ++counter; |
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92 | } |
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93 | |||
94 | return ++counter; |
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95 | } |
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96 | |||
97 | /** Print one string |
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98 | * @param s string |
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99 | * @param width |
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100 | * @param precision |
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101 | * @param flags |
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102 | * @return number of printed characters or EOF |
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103 | */ |
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104 | |||
105 | static int print_string(char *s, int width, int precision, uint64_t flags) |
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106 | { |
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107 | int counter = 0; |
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108 | size_t size; |
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109 | |||
110 | if (s == NULL) { |
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111 | return putstr("(NULL)"); |
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112 | } |
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113 | |||
114 | size = strlen(s); |
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115 | |||
116 | /* print leading spaces */ |
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117 | |||
118 | if (precision == 0) |
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119 | precision = size; |
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120 | |||
121 | width -= precision; |
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122 | |||
123 | if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) { |
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124 | while (width-- > 0) { |
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125 | putchar(' '); |
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126 | counter++; |
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127 | } |
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128 | } |
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129 | |||
130 | while (precision > size) { |
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131 | precision--; |
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132 | putchar(' '); |
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133 | ++counter; |
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134 | } |
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135 | |||
136 | if (putnchars(s, precision) == EOF) { |
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137 | return EOF; |
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138 | } |
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139 | |||
140 | counter += precision; |
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141 | |||
142 | while (width-- > 0) { |
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143 | putchar(' '); |
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144 | ++counter; |
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145 | } |
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146 | |||
147 | return ++counter; |
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148 | } |
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149 | |||
150 | |||
974 | cejka | 151 | /** Print number in given base |
152 | * |
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153 | * Print significant digits of a number in given |
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154 | * base. |
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155 | * |
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156 | * @param num Number to print. |
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1173 | cejka | 157 | * @param width |
158 | * @param precision |
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974 | cejka | 159 | * @param base Base to print the number in (should |
160 | * be in range 2 .. 16). |
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1073 | cejka | 161 | * @param flags output modifiers |
162 | * @return number of written characters or EOF |
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974 | cejka | 163 | * |
164 | */ |
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1173 | cejka | 165 | static int print_number(uint64_t num, int width, int precision, int base , uint64_t flags) |
974 | cejka | 166 | { |
1073 | cejka | 167 | char *digits = digits_small; |
168 | char d[PRINT_NUMBER_BUFFER_SIZE]; /* this is good enough even for base == 2, prefix and sign */ |
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169 | char *ptr = &d[PRINT_NUMBER_BUFFER_SIZE - 1]; |
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1173 | cejka | 170 | int size = 0; |
171 | int written = 0; |
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172 | char sgn; |
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974 | cejka | 173 | |
1073 | cejka | 174 | if (flags & __PRINTF_FLAG_BIGCHARS) |
175 | digits = digits_big; |
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995 | cejka | 176 | |
1073 | cejka | 177 | *ptr-- = 0; /* Put zero at end of string */ |
178 | |||
179 | if (num == 0) { |
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180 | *ptr-- = '0'; |
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1173 | cejka | 181 | size++; |
1073 | cejka | 182 | } else { |
183 | do { |
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184 | *ptr-- = digits[num % base]; |
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1173 | cejka | 185 | size++; |
1073 | cejka | 186 | } while (num /= base); |
187 | } |
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1173 | cejka | 188 | |
189 | /* Collect sum of all prefixes/signs/... to calculate padding and leading zeroes */ |
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190 | if (flags & __PRINTF_FLAG_PREFIX) { |
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1073 | cejka | 191 | switch(base) { |
192 | case 2: /* Binary formating is not standard, but usefull */ |
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1173 | cejka | 193 | size += 2; |
1073 | cejka | 194 | break; |
195 | case 8: |
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1173 | cejka | 196 | size++; |
1073 | cejka | 197 | break; |
198 | case 16: |
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1173 | cejka | 199 | size += 2; |
1073 | cejka | 200 | break; |
201 | } |
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202 | } |
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1173 | cejka | 203 | |
204 | sgn = 0; |
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1073 | cejka | 205 | if (flags & __PRINTF_FLAG_SIGNED) { |
206 | if (flags & __PRINTF_FLAG_NEGATIVE) { |
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1173 | cejka | 207 | sgn = '-'; |
208 | size++; |
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1073 | cejka | 209 | } else if (flags & __PRINTF_FLAG_SHOWPLUS) { |
1173 | cejka | 210 | sgn = '+'; |
211 | size++; |
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1073 | cejka | 212 | } else if (flags & __PRINTF_FLAG_SPACESIGN) { |
1173 | cejka | 213 | sgn = ' '; |
214 | size++; |
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1073 | cejka | 215 | } |
216 | } |
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974 | cejka | 217 | |
1073 | cejka | 218 | if (flags & __PRINTF_FLAG_LEFTALIGNED) { |
219 | flags &= ~__PRINTF_FLAG_ZEROPADDED; |
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220 | } |
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1173 | cejka | 221 | |
222 | /* if number is leftaligned or precision is specified then zeropadding is ignored */ |
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1073 | cejka | 223 | if (flags & __PRINTF_FLAG_ZEROPADDED) { |
1173 | cejka | 224 | if ((precision == 0) && (width > size)) { |
225 | precision = width - size; |
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1073 | cejka | 226 | } |
227 | } |
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1173 | cejka | 228 | |
229 | /* print leading spaces */ |
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230 | if (size > precision) /* We must print whole number not only a part */ |
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231 | precision = size; |
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232 | |||
233 | width -= precision; |
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1073 | cejka | 234 | |
1173 | cejka | 235 | if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) { |
236 | while (width-- > 0) { |
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237 | putchar(' '); |
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238 | written++; |
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239 | } |
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240 | } |
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241 | |||
242 | /* print sign */ |
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243 | if (sgn) { |
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244 | putchar(sgn); |
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245 | written++; |
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246 | } |
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247 | |||
248 | /* print prefix */ |
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249 | |||
250 | if (flags & __PRINTF_FLAG_PREFIX) { |
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251 | switch(base) { |
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252 | case 2: /* Binary formating is not standard, but usefull */ |
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253 | putchar('0'); |
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254 | if (flags & __PRINTF_FLAG_BIGCHARS) { |
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255 | putchar('B'); |
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256 | } else { |
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257 | putchar('b'); |
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258 | } |
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259 | written == 2; |
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260 | break; |
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261 | case 8: |
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262 | putchar('o'); |
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263 | written++; |
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264 | break; |
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265 | case 16: |
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266 | putchar('0'); |
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267 | if (flags & __PRINTF_FLAG_BIGCHARS) { |
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268 | putchar('X'); |
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269 | } else { |
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270 | putchar('x'); |
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271 | } |
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272 | written += 2; |
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273 | break; |
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274 | } |
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275 | } |
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276 | |||
277 | /* print leading zeroes */ |
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278 | precision -= size; |
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279 | while (precision-- > 0) { |
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280 | putchar('0'); |
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281 | written++; |
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282 | } |
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283 | |||
284 | |||
285 | /* print number itself */ |
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286 | |||
287 | written += putstr(++ptr); |
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288 | |||
289 | /* print ending spaces */ |
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290 | |||
291 | while (width-- > 0) { |
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292 | putchar(' '); |
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293 | written++; |
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294 | } |
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295 | |||
296 | return written; |
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974 | cejka | 297 | } |
298 | |||
299 | |||
300 | |||
301 | /** General formatted text print |
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302 | * |
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303 | * Print text formatted according the fmt parameter |
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304 | * and variant arguments. Each formatting directive |
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305 | * begins with \% (percentage) character and one of the |
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306 | * following character: |
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307 | * |
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308 | * \% Prints the percentage character. |
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309 | * |
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310 | * s The next variant argument is treated as char* |
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311 | * and printed as a NULL terminated string. |
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312 | * |
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313 | * c The next variant argument is treated as a single char. |
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314 | * |
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315 | * p The next variant argument is treated as a maximum |
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316 | * bit-width integer with respect to architecture |
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317 | * and printed in full hexadecimal width. |
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318 | * |
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319 | * P As with 'p', but '0x' is prefixed. |
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320 | * |
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321 | * q The next variant argument is treated as a 64b integer |
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322 | * and printed in full hexadecimal width. |
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323 | * |
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324 | * Q As with 'q', but '0x' is prefixed. |
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325 | * |
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326 | * l The next variant argument is treated as a 32b integer |
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327 | * and printed in full hexadecimal width. |
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328 | * |
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329 | * L As with 'l', but '0x' is prefixed. |
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330 | * |
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331 | * w The next variant argument is treated as a 16b integer |
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332 | * and printed in full hexadecimal width. |
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333 | * |
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334 | * W As with 'w', but '0x' is prefixed. |
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335 | * |
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336 | * b The next variant argument is treated as a 8b integer |
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337 | * and printed in full hexadecimal width. |
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338 | * |
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339 | * B As with 'b', but '0x' is prefixed. |
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340 | * |
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341 | * d The next variant argument is treated as integer |
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342 | * and printed in standard decimal format (only significant |
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343 | * digits). |
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344 | * |
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345 | * x The next variant argument is treated as integer |
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346 | * and printed in standard hexadecimal format (only significant |
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347 | * digits). |
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348 | * |
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349 | * X As with 'x', but '0x' is prefixed. |
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350 | * |
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351 | * All other characters from fmt except the formatting directives |
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352 | * are printed in verbatim. |
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353 | * |
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354 | * @param fmt Formatting NULL terminated string. |
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355 | */ |
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356 | int printf(const char *fmt, ...) |
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357 | { |
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1073 | cejka | 358 | int i = 0, j = 0; /* i is index of currently processed char from fmt, j is index to the first not printed nonformating character */ |
359 | int end; |
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360 | int counter; /* counter of printed characters */ |
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361 | int retval; /* used to store return values from called functions */ |
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974 | cejka | 362 | va_list ap; |
1073 | cejka | 363 | char c; |
364 | qualifier_t qualifier; /* type of argument */ |
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365 | int base; /* base in which will be parameter (numbers only) printed */ |
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366 | uint64_t number; /* argument value */ |
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367 | size_t size; /* byte size of integer parameter */ |
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1173 | cejka | 368 | int width, precision; |
995 | cejka | 369 | uint64_t flags; |
974 | cejka | 370 | |
371 | counter = 0; |
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372 | va_start(ap, fmt); |
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1173 | cejka | 373 | |
974 | cejka | 374 | while ((c = fmt[i])) { |
992 | jermar | 375 | /* control character */ |
974 | cejka | 376 | if (c == '%' ) { |
992 | jermar | 377 | /* print common characters if any processed */ |
974 | cejka | 378 | if (i > j) { |
995 | cejka | 379 | if ((retval = putnchars(&fmt[j], (size_t)(i - j))) == EOF) { /* error */ |
974 | cejka | 380 | return -counter; |
381 | } |
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382 | counter += retval; |
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383 | } |
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1073 | cejka | 384 | |
385 | j = i; |
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995 | cejka | 386 | /* parse modifiers */ |
387 | flags = 0; |
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1073 | cejka | 388 | end = 0; |
389 | |||
390 | do { |
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391 | ++i; |
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392 | switch (c = fmt[i]) { |
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393 | case '#': flags |= __PRINTF_FLAG_PREFIX; break; |
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394 | case '-': flags |= __PRINTF_FLAG_LEFTALIGNED; break; |
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395 | case '+': flags |= __PRINTF_FLAG_SHOWPLUS; break; |
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396 | case ' ': flags |= __PRINTF_FLAG_SPACESIGN; break; |
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397 | case '0': flags |= __PRINTF_FLAG_ZEROPADDED; break; |
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398 | default: end = 1; |
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399 | }; |
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400 | |||
401 | } while (end == 0); |
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1173 | cejka | 402 | |
403 | /* width & '*' operator */ |
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404 | width = 0; |
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405 | if (isdigit(fmt[i])) { |
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406 | while (isdigit(fmt[i])) { |
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407 | width *= 10; |
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408 | width += fmt[i++] - '0'; |
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409 | } |
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410 | } else if (fmt[i] == '*') { |
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411 | /* get width value from argument list*/ |
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412 | i++; |
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413 | width = (int)va_arg(ap, int); |
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414 | if (width < 0) { |
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415 | /* negative width means to set '-' flag */ |
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416 | width *= -1; |
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417 | flags |= __PRINTF_FLAG_LEFTALIGNED; |
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418 | } |
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419 | } |
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420 | |||
421 | /* precision and '*' operator */ |
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422 | precision = 0; |
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423 | if (fmt[i] == '.') { |
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424 | ++i; |
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425 | if (isdigit(fmt[i])) { |
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426 | while (isdigit(fmt[i])) { |
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427 | precision *= 10; |
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428 | precision += fmt[i++] - '0'; |
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429 | } |
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430 | } else if (fmt[i] == '*') { |
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431 | /* get precision value from argument list*/ |
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432 | i++; |
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433 | precision = (int)va_arg(ap, int); |
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434 | if (precision < 0) { |
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435 | /* negative precision means to ignore it */ |
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436 | precision = 0; |
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437 | } |
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438 | } |
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439 | } |
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1073 | cejka | 440 | |
441 | switch (fmt[i++]) { |
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1173 | cejka | 442 | /** TODO: unimplemented qualifiers: |
443 | * t ptrdiff_t - ISO C 99 |
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444 | */ |
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1073 | cejka | 445 | case 'h': /* char or short */ |
446 | qualifier = PrintfQualifierShort; |
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447 | if (fmt[i] == 'h') { |
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448 | i++; |
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449 | qualifier = PrintfQualifierByte; |
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450 | } |
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451 | break; |
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452 | case 'l': /* long or long long*/ |
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453 | qualifier = PrintfQualifierLong; |
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454 | if (fmt[i] == 'l') { |
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455 | i++; |
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456 | qualifier = PrintfQualifierLongLong; |
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457 | } |
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458 | break; |
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459 | case 'z': /* size_t */ |
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460 | qualifier = PrintfQualifierSizeT; |
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461 | break; |
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462 | default: |
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463 | qualifier = PrintfQualifierInt; /* default type */ |
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464 | --i; |
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995 | cejka | 465 | } |
1073 | cejka | 466 | |
467 | base = 10; |
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468 | |||
974 | cejka | 469 | switch (c = fmt[i]) { |
470 | |||
471 | /* |
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472 | * String and character conversions. |
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473 | */ |
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474 | case 's': |
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1173 | cejka | 475 | if ((retval = print_string(va_arg(ap, char*), width, precision, flags)) == EOF) { |
974 | cejka | 476 | return -counter; |
477 | }; |
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478 | |||
479 | counter += retval; |
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1073 | cejka | 480 | j = i + 1; |
481 | goto next_char; |
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974 | cejka | 482 | case 'c': |
1173 | cejka | 483 | c = va_arg(ap, unsigned int); |
484 | if ((retval = print_char(c, width, flags )) == EOF) { |
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974 | cejka | 485 | return -counter; |
486 | }; |
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487 | |||
488 | counter += retval; |
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1073 | cejka | 489 | j = i + 1; |
490 | goto next_char; |
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974 | cejka | 491 | |
1073 | cejka | 492 | /* |
493 | * Integer values |
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974 | cejka | 494 | */ |
1073 | cejka | 495 | case 'P': /* pointer */ |
496 | flags |= __PRINTF_FLAG_BIGCHARS; |
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974 | cejka | 497 | case 'p': |
1073 | cejka | 498 | flags |= __PRINTF_FLAG_PREFIX; |
499 | base = 16; |
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500 | qualifier = PrintfQualifierPointer; |
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501 | break; |
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502 | case 'b': |
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503 | base = 2; |
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974 | cejka | 504 | break; |
1073 | cejka | 505 | case 'o': |
506 | base = 8; |
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974 | cejka | 507 | break; |
508 | case 'd': |
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995 | cejka | 509 | case 'i': |
1073 | cejka | 510 | flags |= __PRINTF_FLAG_SIGNED; |
511 | case 'u': |
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512 | break; |
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974 | cejka | 513 | case 'X': |
1073 | cejka | 514 | flags |= __PRINTF_FLAG_BIGCHARS; |
974 | cejka | 515 | case 'x': |
1073 | cejka | 516 | base = 16; |
517 | break; |
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518 | /* percentile itself */ |
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519 | case '%': |
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520 | j = i; |
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521 | goto next_char; |
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974 | cejka | 522 | /* |
523 | * Bad formatting. |
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524 | */ |
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525 | default: |
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1073 | cejka | 526 | /* Unknown format |
527 | * now, the j is index of '%' so we will |
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528 | * print whole bad format sequence |
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529 | */ |
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530 | goto next_char; |
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531 | } |
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532 | |||
533 | |||
534 | /* Print integers */ |
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535 | /* print number */ |
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536 | switch (qualifier) { |
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537 | case PrintfQualifierByte: |
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538 | size = sizeof(unsigned char); |
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539 | number = (uint64_t)va_arg(ap, unsigned int); |
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540 | break; |
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541 | case PrintfQualifierShort: |
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542 | size = sizeof(unsigned short); |
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543 | number = (uint64_t)va_arg(ap, unsigned int); |
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544 | break; |
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545 | case PrintfQualifierInt: |
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546 | size = sizeof(unsigned int); |
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547 | number = (uint64_t)va_arg(ap, unsigned int); |
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548 | break; |
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549 | case PrintfQualifierLong: |
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550 | size = sizeof(unsigned long); |
||
551 | number = (uint64_t)va_arg(ap, unsigned long); |
||
552 | break; |
||
553 | case PrintfQualifierLongLong: |
||
554 | size = sizeof(unsigned long long); |
||
555 | number = (uint64_t)va_arg(ap, unsigned long long); |
||
556 | break; |
||
557 | case PrintfQualifierPointer: |
||
558 | size = sizeof(void *); |
||
559 | number = (uint64_t)(unsigned long)va_arg(ap, void *); |
||
560 | break; |
||
561 | case PrintfQualifierSizeT: |
||
562 | size = sizeof(size_t); |
||
563 | number = (uint64_t)va_arg(ap, size_t); |
||
564 | break; |
||
565 | default: /* Unknown qualifier */ |
||
974 | cejka | 566 | return -counter; |
1073 | cejka | 567 | |
974 | cejka | 568 | } |
1073 | cejka | 569 | |
570 | if (flags & __PRINTF_FLAG_SIGNED) { |
||
571 | if (number & (0x1 << (size*8 - 1))) { |
||
572 | flags |= __PRINTF_FLAG_NEGATIVE; |
||
573 | |||
574 | if (size == sizeof(uint64_t)) { |
||
575 | number = -((int64_t)number); |
||
576 | } else { |
||
577 | number = ~number; |
||
578 | number &= (~((0xFFFFFFFFFFFFFFFFll) << (size * 8))); |
||
579 | number++; |
||
580 | } |
||
581 | } |
||
582 | } |
||
583 | |||
1173 | cejka | 584 | if ((retval = print_number(number, width, precision, base, flags)) == EOF ) { |
1073 | cejka | 585 | return -counter; |
586 | }; |
||
587 | |||
588 | counter += retval; |
||
589 | j = i + 1; |
||
974 | cejka | 590 | } |
1073 | cejka | 591 | next_char: |
592 | |||
974 | cejka | 593 | ++i; |
594 | } |
||
595 | |||
975 | cejka | 596 | if (i > j) { |
995 | cejka | 597 | if ((retval = putnchars(&fmt[j], (size_t)(i - j))) == EOF) { /* error */ |
975 | cejka | 598 | return -counter; |
599 | } |
||
600 | counter += retval; |
||
601 | } |
||
602 | |||
974 | cejka | 603 | va_end(ap); |
604 | return counter; |
||
605 | } |
||
606 |