annotate cos/kernel/snprintf.c @ 293:6aa721e7b10b

Try to improve build sequence
author Windel Bouwman
date Thu, 28 Nov 2013 20:39:37 +0100
parents 8012221dd740
children
rev   line source
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1 /*
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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2 * snprintf.c
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3 */
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4 #include "kernel.h"
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5
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6 /*
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7 * NOTE! This ctype does not handle EOF like the standard C
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8 * library is required to.
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9 */
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10
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11 #define _U 0x01 /* upper */
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12 #define _L 0x02 /* lower */
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13 #define _D 0x04 /* digit */
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14 #define _C 0x08 /* cntrl */
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15 #define _P 0x10 /* punct */
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16 #define _S 0x20 /* white space (space/lf/tab) */
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17 #define _X 0x40 /* hex digit */
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18 #define _SP 0x80 /* hard space (0x20) */
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19
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20 uint8_t _ctype[] = {
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92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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21 _C,_C,_C,_C,_C,_C,_C,_C, /* 0-7 */
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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22 _C,_C|_S,_C|_S,_C|_S,_C|_S,_C|_S,_C,_C, /* 8-15 */
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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23 _C,_C,_C,_C,_C,_C,_C,_C, /* 16-23 */
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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24 _C,_C,_C,_C,_C,_C,_C,_C, /* 24-31 */
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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25 _S|_SP,_P,_P,_P,_P,_P,_P,_P, /* 32-39 */
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26 _P,_P,_P,_P,_P,_P,_P,_P, /* 40-47 */
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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27 _D,_D,_D,_D,_D,_D,_D,_D, /* 48-55 */
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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28 _D,_D,_P,_P,_P,_P,_P,_P, /* 56-63 */
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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29 _P,_U|_X,_U|_X,_U|_X,_U|_X,_U|_X,_U|_X,_U, /* 64-71 */
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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30 _U,_U,_U,_U,_U,_U,_U,_U, /* 72-79 */
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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31 _U,_U,_U,_U,_U,_U,_U,_U, /* 80-87 */
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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32 _U,_U,_U,_P,_P,_P,_P,_P, /* 88-95 */
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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33 _P,_L|_X,_L|_X,_L|_X,_L|_X,_L|_X,_L|_X,_L, /* 96-103 */
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34 _L,_L,_L,_L,_L,_L,_L,_L, /* 104-111 */
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35 _L,_L,_L,_L,_L,_L,_L,_L, /* 112-119 */
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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36 _L,_L,_L,_P,_P,_P,_P,_C, /* 120-127 */
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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37 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 128-143 */
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38 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 144-159 */
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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39 _S|_SP,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P, /* 160-175 */
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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40 _P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P, /* 176-191 */
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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41 _U,_U,_U,_U,_U,_U,_U,_U,_U,_U,_U,_U,_U,_U,_U,_U, /* 192-207 */
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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42 _U,_U,_U,_U,_U,_U,_U,_P,_U,_U,_U,_U,_U,_U,_U,_L, /* 208-223 */
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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43 _L,_L,_L,_L,_L,_L,_L,_L,_L,_L,_L,_L,_L,_L,_L,_L, /* 224-239 */
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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44 _L,_L,_L,_L,_L,_L,_L,_P,_L,_L,_L,_L,_L,_L,_L,_L}; /* 240-255 */
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45
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46 #define __ismask(x) (_ctype[(int)(uint8_t)(x)])
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47
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48 #define isalnum(c) ((__ismask(c)&(_U|_L|_D)) != 0)
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49 #define isalpha(c) ((__ismask(c)&(_U|_L)) != 0)
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50 #define iscntrl(c) ((__ismask(c)&(_C)) != 0)
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51 #define isdigit(c) ((__ismask(c)&(_D)) != 0)
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52 #define isgraph(c) ((__ismask(c)&(_P|_U|_L|_D)) != 0)
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53 #define islower(c) ((__ismask(c)&(_L)) != 0)
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54 #define isprint(c) ((__ismask(c)&(_P|_U|_L|_D|_SP)) != 0)
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55 #define ispunct(c) ((__ismask(c)&(_P)) != 0)
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56 #define isspace(c) ((__ismask(c)&(_S)) != 0)
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57 #define isupper(c) ((__ismask(c)&(_U)) != 0)
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58 #define isxdigit(c) ((__ismask(c)&(_D|_X)) != 0)
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59
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60 #define isascii(c) (((unsigned char)(c))<=0x7f)
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61 #define toascii(c) (((unsigned char)(c))&0x7f)
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62
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63 static inline uint8_t tolower(uint8_t c)
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64 {
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65 if (isupper(c))
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66 c += 'a'-'A';
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67 return c;
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68 }
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69
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70 static inline uint8_t toupper(uint8_t c)
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71 {
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72 if (islower(c))
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73 c -= 'a'-'A';
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74 return c;
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75 }
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92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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77 #define MORE_THAN_YOU_WANT 1<<30
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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78 #define MAX_STDOUT_CHARS 255
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79
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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80 static char hexmap[] = {
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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81 '0', '1', '2', '3', '4', '5', '6', '7',
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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82 '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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83 };
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84
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85 /* string print function. Supports the formats:
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86 %p, %x: 64 bits hex number
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87 %d: signed integer
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88 %u: unsigned integer
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89 */
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92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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90 void va_snprintf(char *b, int l, const char *fmt, va_list pvar)
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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91 {
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92 int i;
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93 int64_t s64;
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94 uint64_t u64;
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95 char *t;
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96 char d[20]; // For storing the decimal value in chars.
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92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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97
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98 if ((fmt == 0) || (b == 0) || (l < 1))
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99 {
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100 return;
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101 }
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92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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102
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103 while ((l > 0) && (*fmt != 0))
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104 {
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105 if (*fmt == '%')
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106 {
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107 if ((--l) == 0)
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108 {
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92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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109 break;
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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110 }
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111
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112 fmt++;
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113 switch (*fmt)
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114 {
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115 case 's': /* string */
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116 t = va_arg(pvar, char *);
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117 while ((l > 0) && (*t != 0))
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118 {
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119 *b++ = *t++;
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120 l--;
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121 }
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122 break;
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123
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124 case 'c': /* single character */
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125 *b++ = (char)va_arg(pvar, int);
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126 l--;
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127 break;
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128
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129 case 'x':
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130 case 'p':
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131 /* Pointer and hex uint64_t */
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132 /* 16 digit, unsigned 64-bit hex integer */
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133 if (l < 18)
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134 {
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135 l = 0;
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136 break;
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137 }
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138
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139 *b++ = '0';
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140 *b++ = 'x';
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141
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142 u64 = va_arg(pvar, uint64_t);
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143 for (i = 15; i >= 0; i--)
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144 {
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145 b[i] = hexmap[u64 & 0x0f];
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146 u64 >>= 4;
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147 }
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148 b += 16;
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149 l -= 16;
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150 break;
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151
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152 case 'd': /* signed integer */
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153 s64 = va_arg(pvar, int);
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154 if (s64 < 0)
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155 {
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156 u64 = (uint64_t)(-s64);
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157 *b++ = '-';
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158 if ((--l) == 0)
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159 {
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160 break;
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161 }
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162 }
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163 else
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164 {
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165 u64 = s64;
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166 }
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167 goto u2;
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168
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169 case 'u': /* unsigned integer */
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170 u64 = va_arg(pvar, unsigned int);
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171 u2:
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172 i = 19;
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173 do
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174 {
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175 d[i] = (u64 % 10) + '0';
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176 u64 /= 10;
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177 i--;
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178 }
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179 while ((u64 != 0) && (i >= 0));
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180
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181 // Now print the characters:
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182 while (++i < 20)
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183 {
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184 *b++ = d[i];
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185 if ((--l) == 0)
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186 {
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187 break;
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188 }
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189 }
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190 break;
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191
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192 default:
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193 *b++ = *fmt;
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194 }
34
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195 }
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196 else
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197 {
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198 *b++ = *fmt;
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199 l--;
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200 }
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201
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202 fmt++;
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203 }
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204
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205 *b = 0; // Add a 0 terminate
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206 }
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207
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208 void snprintf(char *str, int len, char *fmt, ...)
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209 {
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210 va_list pvar;
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211 va_start(pvar, fmt);
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212 va_snprintf(str, len, fmt, pvar);
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213 va_end(pvar);
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214 }
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215
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216 void
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217 printf(const char* fmt, ...)
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218 {
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219 static char buf[MAX_STDOUT_CHARS];
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220
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221 va_list args;
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222 va_start(args, fmt);
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223 va_snprintf(buf, MAX_STDOUT_CHARS, fmt, args);
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224 va_end(args);
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225
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226 print_string(buf);
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227 }