1 | /**
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2 | * @file ntstdio.c
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3 | * @author CuBeatSystems
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4 | * @author Shinichiro Nakamura
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5 | * @copyright
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6 | * ===============================================================
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7 | * Natural Tiny Shell (NT-Shell) Version 0.3.1
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8 | * ===============================================================
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9 | * Copyright (c) 2010-2016 Shinichiro Nakamura
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10 | *
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11 | * Permission is hereby granted, free of charge, to any person
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12 | * obtaining a copy of this software and associated documentation
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13 | * files (the "Software"), to deal in the Software without
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14 | * restriction, including without limitation the rights to use,
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15 | * copy, modify, merge, publish, distribute, sublicense, and/or
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16 | * sell copies of the Software, and to permit persons to whom the
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17 | * Software is furnished to do so, subject to the following
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18 | * conditions:
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19 | *
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20 | * The above copyright notice and this permission notice shall be
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21 | * included in all copies or substantial portions of the Software.
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22 | *
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23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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25 | * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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27 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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28 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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29 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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30 | * OTHER DEALINGS IN THE SOFTWARE.
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31 | */
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32 |
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33 | /*------------------------------------------------------------------------/
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34 | / Universal string handler for user console interface
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35 | /-------------------------------------------------------------------------/
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36 | /
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37 | / Copyright (C) 2011, ChaN, all right reserved.
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38 | /
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39 | / * This software is a free software and there is NO WARRANTY.
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40 | / * No restriction on use. You can use, modify and redistribute it for
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41 | / personal, non-profit or commercial products UNDER YOUR RESPONSIBILITY.
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42 | / * Redistributions of source code must retain the above copyright notice.
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43 | /
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44 | /-------------------------------------------------------------------------*/
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45 |
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46 | #include <stdarg.h>
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47 | #include "ntstdio.h"
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48 |
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49 | #define FLAG_ZERO_PADDED (1 << 0)
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50 | #define FLAG_LEFT_JUSTIFIED (1 << 1)
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51 | #define FLAG_SIZE_LONG_INT (1 << 2)
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52 | #define FLAG_SIGNED_DECIMAL (1 << 3)
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53 | #define FLAG_SIZE_HALF_INT (1 << 4)
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54 |
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55 | /*
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56 | * ntstdio_printf("%d", 1234); "1234"
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57 | * ntstdio_printf("%6d,%3d%%", -200, 5); " -200, 5%"
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58 | * ntstdio_printf("%-6u", 100); "100 "
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59 | * ntstdio_printf("%ld", 12345678L); "12345678"
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60 | * ntstdio_printf("%04x", 0xA3); "00a3"
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61 | * ntstdio_printf("%08LX", 0x123ABC); "00123ABC"
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62 | * ntstdio_printf("%016b", 0x550F); "0101010100001111"
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63 | * ntstdio_printf("%s", "String"); "String"
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64 | * ntstdio_printf("%-4s", "abc"); "abc "
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65 | * ntstdio_printf("%4s", "abc"); " abc"
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66 | * ntstdio_printf("%c", 'a'); "a"
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67 | * ntstdio_printf("%f", 10.0); <ntstdio_printf lacks floating point support>
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68 | */
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69 |
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70 | static int xvprintf(ntstdio_t *handle, const char *fmt, va_list arp)
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71 | {
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72 | unsigned int i, j;
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73 | unsigned int flag, radix, width;
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74 | unsigned long value;
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75 | char s[16], c, d, *p;
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76 |
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77 | while (1) {
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78 | /*
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79 | * Get a character.
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80 | */
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81 | c = *fmt++;
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82 | if (!c) {
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83 | /*
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84 | * End of the format.
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85 | */
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86 | break;
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87 | }
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88 | if (c != '%') {
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89 | /*
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90 | * Pass through it if not a % sequense
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91 | */
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92 | ntstdio_putc(handle, c);
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93 | continue;
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94 | }
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95 |
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96 | /*
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97 | * Reset the flag.
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98 | */
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99 | flag = 0;
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100 |
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101 | /*
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102 | * Get the first character of the sequense.
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103 | */
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104 | c = *fmt++;
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105 | if (c == '0') {
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106 | flag = FLAG_ZERO_PADDED;
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107 | c = *fmt++;
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108 | }
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109 | else {
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110 | if (c == '-') {
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111 | flag = FLAG_LEFT_JUSTIFIED;
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112 | c = *fmt++;
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113 | }
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114 | }
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115 | /*
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116 | * Calculate the minimum width.
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117 | */
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118 | for (width = 0; (c >= '0') && (c <= '9'); c = *fmt++) {
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119 | width = (width * 10) + (c - '0');
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120 | }
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121 | if ((c == 'l') || (c == 'L')) {
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122 | flag |= FLAG_SIZE_LONG_INT;
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123 | c = *fmt++;
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124 | }
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125 | else if (c == 'h') { /* Prefix: Size is short int */
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126 | flag |= FLAG_SIZE_HALF_INT;
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127 | c = *fmt++;
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128 | }
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129 | if (!c) {
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130 | /*
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131 | * End of the format.
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132 | */
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133 | break;
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134 | }
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135 | d = c;
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136 | if (d >= 'a') {
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137 | d -= 0x20;
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138 | }
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139 | /* Type is... */
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140 | switch (d) {
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141 | case 'S':
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142 | /* String */
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143 | p = va_arg(arp, char*);
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144 | for (j = 0; p[j]; j++) {
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145 | }
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146 | while (!(flag & FLAG_LEFT_JUSTIFIED) && (j++ < width)) {
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147 | ntstdio_putc(handle, ' ');
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148 | }
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149 | ntstdio_puts(handle, p);
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150 | while (j++ < width) {
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151 | ntstdio_putc(handle, ' ');
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152 | }
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153 | continue;
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154 | case 'C':
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155 | /* Character */
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156 | ntstdio_putc(handle, (char)va_arg(arp, int));
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157 | continue;
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158 | case 'B':
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159 | /* Binary */
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160 | radix = 2;
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161 | break;
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162 | case 'O':
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163 | /* Octal */
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164 | radix = 8;
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165 | break;
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166 | case 'D':
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167 | /* Signed decimal */
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168 | radix = 10;
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169 | break;
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170 | case 'U':
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171 | /* Unsigned decimal */
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172 | radix = 10;
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173 | break;
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174 | case 'X':
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175 | /* Hexdecimal */
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176 | radix = 16;
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177 | break;
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178 | default:
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179 | /* Unknown type (passthrough) */
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180 | ntstdio_putc(handle, c);
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181 | continue;
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182 | }
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183 |
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184 | /*
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185 | * Get an argument and put it in numeral.
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186 | */
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187 | value = (flag & FLAG_SIZE_LONG_INT) ? va_arg(arp, long)
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188 | : (flag & FLAG_SIZE_HALF_INT) ? ((d == 'D') ? (long)((short)va_arg(arp, int)) : (long)((unsigned short)va_arg(arp, unsigned int)))
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189 | : ((d == 'D') ? (long)va_arg(arp, int) : (long)va_arg(arp, unsigned int));
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190 | if ((d == 'D') && (value & 0x80000000)) {
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191 | value = 0 - value;
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192 | flag |= FLAG_SIGNED_DECIMAL;
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193 | }
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194 | i = 0;
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195 | do {
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196 | d = (char)(value % radix);
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197 | value /= radix;
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198 | if (d > 9) {
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199 | d += (c == 'x') ? 0x27 : 0x07;
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200 | }
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201 | s[i++] = d + '0';
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202 | } while (value && (i < sizeof(s)));
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203 | if (flag & FLAG_SIGNED_DECIMAL) {
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204 | s[i++] = '-';
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205 | }
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206 | j = i;
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207 | d = (flag & FLAG_ZERO_PADDED) ? '0' : ' ';
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208 | while (!(flag & FLAG_LEFT_JUSTIFIED) && (j++ < width)) {
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209 | ntstdio_putc(handle, d);
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210 | }
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211 | do {
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212 | ntstdio_putc(handle, s[--i]);
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213 | } while (i);
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214 | while (j++ < width) {
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215 | ntstdio_putc(handle, ' ');
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216 | }
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217 | }
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218 |
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219 | return handle->pos;
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220 | }
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221 |
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222 | void ntstdio_init(ntstdio_t *handle, unsigned int option, NTSTDIO_XI xi, NTSTDIO_XO xo)
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223 | {
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224 | handle->xi = xi;
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225 | handle->xo = xo;
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226 | handle->pos = 0;
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227 | handle->option = option;
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228 | }
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229 |
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230 | static void _putc(ntstdio_t *handle, char c)
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231 | {
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232 | if (handle->xo) {
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233 | handle->xo(handle, (unsigned char)c);
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234 | }
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235 | handle->pos++;
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236 | }
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237 |
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238 | void ntstdio_putc(ntstdio_t *handle, char c)
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239 | {
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240 | if ((handle->option & NTSTDIO_OPTION_LF_CRLF) && (c == '\n')) {
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241 | _putc(handle, '\r');
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242 | _putc(handle, '\n');
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243 | }
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244 | else{
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245 | _putc(handle, c);
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246 | }
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247 | }
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248 |
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249 | void ntstdio_puts(ntstdio_t *handle, const char *str)
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250 | {
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251 | while (*str) {
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252 | ntstdio_putc(handle, *str++);
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253 | }
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254 | }
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255 |
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256 | void ntstdio_fputs(ntstdio_t *handle, NTSTDIO_XO xo, const char *str)
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257 | {
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258 | NTSTDIO_XO pf;
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259 |
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260 | /* Save current output device */
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261 | pf = handle->xo;
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262 | /* Switch output to specified device */
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263 | handle->xo = xo;
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264 |
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265 | while (*str) {
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266 | ntstdio_putc(handle, *str++);
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267 | }
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268 |
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269 | /* Restore output device */
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270 | handle->xo = pf;
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271 | }
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272 |
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273 | int ntstdio_printf(ntstdio_t *handle, const char *fmt, ...)
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274 | {
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275 | int result;
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276 | va_list arp;
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277 | va_start(arp, fmt);
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278 | result = xvprintf(handle, fmt, arp);
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279 | va_end(arp);
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280 | return result;
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281 | }
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282 |
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283 | struct put_buf_t {
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284 | char *outptr;
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285 | int len;
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286 | };
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287 |
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288 | static void put_buf(struct ntstdio_t *handle, unsigned char c)
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289 | {
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290 | struct put_buf_t *put_buf = (struct put_buf_t *)handle->exinf;
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291 | if ((handle->pos + 1) >= put_buf->len)
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292 | return;
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293 | put_buf->outptr[handle->pos] = (char)c;
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294 | handle->pos++;
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295 | }
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296 |
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297 | int ntstdio_snprintf(char *buf, int len, const char *fmt, ...)
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298 | {
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299 | int result;
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300 | ntstdio_t handle;
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301 | struct put_buf_t exinf;
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302 | va_list arp;
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303 | /* Switch destination for memory */
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304 | handle.xo = put_buf;
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305 | handle.option = 0;
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306 | handle.pos = 0;
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307 | handle.exinf = &exinf;
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308 | exinf.outptr = buf;
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309 | exinf.len = len;
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310 |
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311 | va_start(arp, fmt);
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312 | result = xvprintf(&handle, fmt, arp);
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313 | va_end(arp);
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314 |
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315 | /* Terminate output string with a \0 */
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316 | buf[handle.pos] = '\0';
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317 | return result;
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318 | }
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319 |
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320 | int ntstdio_fprintf(ntstdio_t *handle, NTSTDIO_XO xo, const char *fmt, ...)
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321 | {
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322 | int result;
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323 | va_list arp;
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324 | NTSTDIO_XO pf;
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325 |
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326 | /* Save current output device */
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327 | pf = handle->xo;
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328 | /* Switch output to specified device */
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329 | handle->xo = xo;
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330 |
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331 | va_start(arp, fmt);
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332 | result = xvprintf(handle, fmt, arp);
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333 | va_end(arp);
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334 |
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335 | /* Restore output device */
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336 | handle->xo = pf;
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337 | return result;
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338 | }
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339 |
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340 | int ntstdio_getc(ntstdio_t *handle)
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341 | {
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342 | extern void shell_exit(int cd);
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343 |
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344 | int c = handle->xi(handle);
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345 | if (handle->option & NTSTDIO_OPTION_LF_CR) {
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346 | if (c == '\r')
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347 | c = '\n';
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348 | }
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349 | if (handle->option & NTSTDIO_OPTION_CANON) {
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350 | if (c == 0x03)
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351 | shell_exit(-1);
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352 | }
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353 | if (handle->option & NTSTDIO_OPTION_LINE_ECHO) {
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354 | ntstdio_putc(handle, c);
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355 | }
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356 | return c;
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357 | }
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358 |
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359 | /* 0:End of stream, 1:A line arrived */
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360 | int ntstdio_gets(ntstdio_t *handle, char *buf, int len)
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361 | {
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362 | int c, i;
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363 |
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364 | if (!handle->xi) {
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365 | /* No input function specified */
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366 | return 0;
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367 | }
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368 |
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369 | i = 0;
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370 | for (;;) {
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371 | /* Get a char from the incoming stream */
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372 | c = handle->xi(handle);
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373 | if (!c) {
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374 | /* End of stream */
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375 | return 0;
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376 | }
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377 | if (c == '\r') {
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378 | /* End of line */
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379 | break;
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380 | }
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381 | if ((c == '\b') && i) {
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382 | /* Back space */
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383 | i--;
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384 | if (handle->option & NTSTDIO_OPTION_LINE_ECHO) {
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385 | ntstdio_putc(handle, c);
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386 | }
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387 | continue;
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388 | }
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389 | if ((c >= ' ') && (i < len - 1)) {
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390 | /* Visible chars */
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391 | buf[i++] = c;
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392 | if (handle->option & NTSTDIO_OPTION_LINE_ECHO) {
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393 | ntstdio_putc(handle, c);
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394 | }
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395 | }
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396 | }
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397 | buf[i] = 0;
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398 | /* Terminate with a \0 */
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399 | if (handle->option & NTSTDIO_OPTION_LINE_ECHO) {
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400 | ntstdio_putc(handle, '\n');
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401 | }
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402 | return 1;
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403 | }
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404 |
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405 | /* 0:End of stream, 1:A line arrived */
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406 | int ntstdio_fgets(ntstdio_t *handle, NTSTDIO_XI xi, char *buf, int len)
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407 | {
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408 | NTSTDIO_XI pf;
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409 | int n;
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410 |
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411 | /* Save current input device */
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412 | pf = handle->xi;
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413 | /* Switch input to specified device */
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414 | handle->xi = xi;
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415 | /* Get a line */
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416 | n = ntstdio_gets(handle, buf, len);
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417 | /* Restore input device */
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418 | handle->xi = pf;
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419 |
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420 | return n;
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421 | }
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