1 | /* |
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2 | * linux/lib/vsprintf.c |
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3 | * |
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4 | * Copyright (C) 1991, 1992 Linus Torvalds |
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5 | */ |
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6 | |
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7 | /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */ |
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8 | /* |
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9 | * Wirzenius wrote this portably, Torvalds fucked it up :-) |
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10 | */ |
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11 | |
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12 | /* |
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13 | * Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com> |
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14 | * - changed to provide snprintf and vsnprintf functions |
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15 | * So Feb 1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de> |
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16 | * - scnprintf and vscnprintf |
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17 | */ |
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18 | |
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19 | #include <xen/stdarg.h> |
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20 | #include <xen/ctype.h> |
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21 | #include <xen/lib.h> |
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22 | #include <asm/div64.h> |
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23 | #include <asm/page.h> |
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24 | |
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25 | /** |
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26 | * simple_strtoul - convert a string to an unsigned long |
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27 | * @cp: The start of the string |
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28 | * @endp: A pointer to the end of the parsed string will be placed here |
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29 | * @base: The number base to use |
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30 | */ |
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31 | unsigned long simple_strtoul( |
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32 | const char *cp, const char **endp, unsigned int base) |
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33 | { |
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34 | unsigned long result = 0,value; |
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35 | |
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36 | if (!base) { |
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37 | base = 10; |
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38 | if (*cp == '0') { |
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39 | base = 8; |
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40 | cp++; |
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41 | if ((toupper(*cp) == 'X') && isxdigit(cp[1])) { |
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42 | cp++; |
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43 | base = 16; |
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44 | } |
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45 | } |
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46 | } else if (base == 16) { |
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47 | if (cp[0] == '0' && toupper(cp[1]) == 'X') |
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48 | cp += 2; |
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49 | } |
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50 | while (isxdigit(*cp) && |
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51 | (value = isdigit(*cp) ? *cp-'0' : toupper(*cp)-'A'+10) < base) { |
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52 | result = result*base + value; |
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53 | cp++; |
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54 | } |
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55 | if (endp) |
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56 | *endp = cp; |
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57 | return result; |
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58 | } |
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59 | |
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60 | EXPORT_SYMBOL(simple_strtoul); |
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61 | |
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62 | /** |
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63 | * simple_strtol - convert a string to a signed long |
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64 | * @cp: The start of the string |
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65 | * @endp: A pointer to the end of the parsed string will be placed here |
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66 | * @base: The number base to use |
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67 | */ |
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68 | long simple_strtol(const char *cp, const char **endp, unsigned int base) |
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69 | { |
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70 | if(*cp=='-') |
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71 | return -simple_strtoul(cp+1,endp,base); |
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72 | return simple_strtoul(cp,endp,base); |
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73 | } |
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74 | |
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75 | EXPORT_SYMBOL(simple_strtol); |
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76 | |
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77 | /** |
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78 | * simple_strtoull - convert a string to an unsigned long long |
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79 | * @cp: The start of the string |
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80 | * @endp: A pointer to the end of the parsed string will be placed here |
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81 | * @base: The number base to use |
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82 | */ |
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83 | unsigned long long simple_strtoull( |
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84 | const char *cp, const char **endp, unsigned int base) |
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85 | { |
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86 | unsigned long long result = 0,value; |
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87 | |
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88 | if (!base) { |
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89 | base = 10; |
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90 | if (*cp == '0') { |
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91 | base = 8; |
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92 | cp++; |
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93 | if ((toupper(*cp) == 'X') && isxdigit(cp[1])) { |
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94 | cp++; |
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95 | base = 16; |
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96 | } |
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97 | } |
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98 | } else if (base == 16) { |
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99 | if (cp[0] == '0' && toupper(cp[1]) == 'X') |
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100 | cp += 2; |
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101 | } |
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102 | while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp) |
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103 | ? toupper(*cp) : *cp)-'A'+10) < base) { |
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104 | result = result*base + value; |
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105 | cp++; |
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106 | } |
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107 | if (endp) |
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108 | *endp = cp; |
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109 | return result; |
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110 | } |
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111 | |
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112 | EXPORT_SYMBOL(simple_strtoull); |
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113 | |
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114 | /** |
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115 | * simple_strtoll - convert a string to a signed long long |
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116 | * @cp: The start of the string |
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117 | * @endp: A pointer to the end of the parsed string will be placed here |
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118 | * @base: The number base to use |
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119 | */ |
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120 | long long simple_strtoll(const char *cp,const char **endp,unsigned int base) |
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121 | { |
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122 | if(*cp=='-') |
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123 | return -simple_strtoull(cp+1,endp,base); |
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124 | return simple_strtoull(cp,endp,base); |
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125 | } |
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126 | |
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127 | static int skip_atoi(const char **s) |
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128 | { |
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129 | int i=0; |
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130 | |
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131 | while (isdigit(**s)) |
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132 | i = i*10 + *((*s)++) - '0'; |
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133 | return i; |
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134 | } |
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135 | |
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136 | #define ZEROPAD 1 /* pad with zero */ |
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137 | #define SIGN 2 /* unsigned/signed long */ |
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138 | #define PLUS 4 /* show plus */ |
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139 | #define SPACE 8 /* space if plus */ |
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140 | #define LEFT 16 /* left justified */ |
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141 | #define SPECIAL 32 /* 0x */ |
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142 | #define LARGE 64 /* use 'ABCDEF' instead of 'abcdef' */ |
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143 | |
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144 | static char *number( |
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145 | char *buf, char *end, unsigned long long num, |
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146 | int base, int size, int precision, int type) |
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147 | { |
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148 | char c,sign,tmp[66]; |
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149 | const char *digits; |
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150 | static const char small_digits[] = "0123456789abcdefghijklmnopqrstuvwxyz"; |
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151 | static const char large_digits[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"; |
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152 | int i; |
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153 | |
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154 | digits = (type & LARGE) ? large_digits : small_digits; |
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155 | if (type & LEFT) |
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156 | type &= ~ZEROPAD; |
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157 | if (base < 2 || base > 36) |
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158 | return NULL; |
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159 | c = (type & ZEROPAD) ? '0' : ' '; |
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160 | sign = 0; |
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161 | if (type & SIGN) { |
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162 | if ((signed long long) num < 0) { |
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163 | sign = '-'; |
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164 | num = - (signed long long) num; |
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165 | size--; |
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166 | } else if (type & PLUS) { |
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167 | sign = '+'; |
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168 | size--; |
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169 | } else if (type & SPACE) { |
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170 | sign = ' '; |
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171 | size--; |
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172 | } |
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173 | } |
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174 | if (type & SPECIAL) { |
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175 | if (base == 16) |
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176 | size -= 2; |
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177 | else if (base == 8) |
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178 | size--; |
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179 | } |
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180 | i = 0; |
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181 | if (num == 0) |
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182 | tmp[i++]='0'; |
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183 | else while (num != 0) |
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184 | tmp[i++] = digits[do_div(num,base)]; |
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185 | if (i > precision) |
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186 | precision = i; |
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187 | size -= precision; |
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188 | if (!(type&(ZEROPAD+LEFT))) { |
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189 | while(size-->0) { |
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190 | if (buf <= end) |
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191 | *buf = ' '; |
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192 | ++buf; |
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193 | } |
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194 | } |
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195 | if (sign) { |
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196 | if (buf <= end) |
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197 | *buf = sign; |
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198 | ++buf; |
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199 | } |
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200 | if (type & SPECIAL) { |
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201 | if (base==8) { |
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202 | if (buf <= end) |
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203 | *buf = '0'; |
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204 | ++buf; |
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205 | } else if (base==16) { |
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206 | if (buf <= end) |
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207 | *buf = '0'; |
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208 | ++buf; |
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209 | if (buf <= end) |
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210 | *buf = digits[33]; |
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211 | ++buf; |
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212 | } |
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213 | } |
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214 | if (!(type & LEFT)) { |
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215 | while (size-- > 0) { |
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216 | if (buf <= end) |
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217 | *buf = c; |
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218 | ++buf; |
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219 | } |
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220 | } |
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221 | while (i < precision--) { |
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222 | if (buf <= end) |
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223 | *buf = '0'; |
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224 | ++buf; |
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225 | } |
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226 | while (i-- > 0) { |
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227 | if (buf <= end) |
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228 | *buf = tmp[i]; |
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229 | ++buf; |
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230 | } |
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231 | while (size-- > 0) { |
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232 | if (buf <= end) |
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233 | *buf = ' '; |
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234 | ++buf; |
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235 | } |
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236 | return buf; |
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237 | } |
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238 | |
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239 | /** |
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240 | * vsnprintf - Format a string and place it in a buffer |
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241 | * @buf: The buffer to place the result into |
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242 | * @size: The size of the buffer, including the trailing null space |
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243 | * @fmt: The format string to use |
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244 | * @args: Arguments for the format string |
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245 | * |
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246 | * The return value is the number of characters which would |
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247 | * be generated for the given input, excluding the trailing |
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248 | * '\0', as per ISO C99. If you want to have the exact |
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249 | * number of characters written into @buf as return value |
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250 | * (not including the trailing '\0'), use vscnprintf. If the |
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251 | * return is greater than or equal to @size, the resulting |
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252 | * string is truncated. |
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253 | * |
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254 | * Call this function if you are already dealing with a va_list. |
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255 | * You probably want snprintf instead. |
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256 | */ |
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257 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) |
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258 | { |
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259 | int len; |
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260 | unsigned long long num; |
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261 | int i, base; |
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262 | char *str, *end, c; |
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263 | const char *s; |
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264 | |
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265 | int flags; /* flags to number() */ |
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266 | |
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267 | int field_width; /* width of output field */ |
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268 | int precision; /* min. # of digits for integers; max |
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269 | number of chars for from string */ |
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270 | int qualifier; /* 'h', 'l', or 'L' for integer fields */ |
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271 | /* 'z' support added 23/7/1999 S.H. */ |
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272 | /* 'z' changed to 'Z' --davidm 1/25/99 */ |
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273 | |
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274 | /* Reject out-of-range values early */ |
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275 | BUG_ON((int)size < 0); |
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276 | |
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277 | str = buf; |
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278 | end = buf + size - 1; |
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279 | |
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280 | if (end < buf - 1) { |
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281 | end = ((void *) -1); |
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282 | size = end - buf + 1; |
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283 | } |
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284 | |
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285 | for (; *fmt ; ++fmt) { |
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286 | if (*fmt != '%') { |
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287 | if (str <= end) |
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288 | *str = *fmt; |
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289 | ++str; |
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290 | continue; |
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291 | } |
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292 | |
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293 | /* process flags */ |
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294 | flags = 0; |
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295 | repeat: |
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296 | ++fmt; /* this also skips first '%' */ |
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297 | switch (*fmt) { |
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298 | case '-': flags |= LEFT; goto repeat; |
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299 | case '+': flags |= PLUS; goto repeat; |
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300 | case ' ': flags |= SPACE; goto repeat; |
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301 | case '#': flags |= SPECIAL; goto repeat; |
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302 | case '0': flags |= ZEROPAD; goto repeat; |
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303 | } |
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304 | |
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305 | /* get field width */ |
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306 | field_width = -1; |
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307 | if (isdigit(*fmt)) |
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308 | field_width = skip_atoi(&fmt); |
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309 | else if (*fmt == '*') { |
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310 | ++fmt; |
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311 | /* it's the next argument */ |
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312 | field_width = va_arg(args, int); |
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313 | if (field_width < 0) { |
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314 | field_width = -field_width; |
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315 | flags |= LEFT; |
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316 | } |
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317 | } |
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318 | |
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319 | /* get the precision */ |
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320 | precision = -1; |
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321 | if (*fmt == '.') { |
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322 | ++fmt; |
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323 | if (isdigit(*fmt)) |
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324 | precision = skip_atoi(&fmt); |
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325 | else if (*fmt == '*') { |
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326 | ++fmt; |
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327 | /* it's the next argument */ |
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328 | precision = va_arg(args, int); |
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329 | } |
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330 | if (precision < 0) |
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331 | precision = 0; |
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332 | } |
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333 | |
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334 | /* get the conversion qualifier */ |
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335 | qualifier = -1; |
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336 | if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || |
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337 | *fmt =='Z' || *fmt == 'z') { |
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338 | qualifier = *fmt; |
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339 | ++fmt; |
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340 | if (qualifier == 'l' && *fmt == 'l') { |
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341 | qualifier = 'L'; |
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342 | ++fmt; |
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343 | } |
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344 | } |
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345 | |
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346 | /* default base */ |
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347 | base = 10; |
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348 | |
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349 | switch (*fmt) { |
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350 | case 'c': |
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351 | if (!(flags & LEFT)) { |
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352 | while (--field_width > 0) { |
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353 | if (str <= end) |
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354 | *str = ' '; |
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355 | ++str; |
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356 | } |
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357 | } |
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358 | c = (unsigned char) va_arg(args, int); |
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359 | if (str <= end) |
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360 | *str = c; |
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361 | ++str; |
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362 | while (--field_width > 0) { |
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363 | if (str <= end) |
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364 | *str = ' '; |
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365 | ++str; |
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366 | } |
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367 | continue; |
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368 | |
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369 | case 's': |
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370 | s = va_arg(args, char *); |
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371 | if ((unsigned long)s < PAGE_SIZE) |
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372 | s = "<NULL>"; |
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373 | |
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374 | len = strnlen(s, precision); |
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375 | |
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376 | if (!(flags & LEFT)) { |
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377 | while (len < field_width--) { |
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378 | if (str <= end) |
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379 | *str = ' '; |
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380 | ++str; |
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381 | } |
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382 | } |
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383 | for (i = 0; i < len; ++i) { |
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384 | if (str <= end) |
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385 | *str = *s; |
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386 | ++str; ++s; |
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387 | } |
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388 | while (len < field_width--) { |
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389 | if (str <= end) |
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390 | *str = ' '; |
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391 | ++str; |
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392 | } |
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393 | continue; |
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394 | |
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395 | case 'p': |
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396 | if (field_width == -1) { |
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397 | field_width = 2*sizeof(void *); |
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398 | flags |= ZEROPAD; |
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399 | } |
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400 | str = number(str, end, |
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401 | (unsigned long) va_arg(args, void *), |
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402 | 16, field_width, precision, flags); |
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403 | continue; |
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404 | |
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405 | |
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406 | case 'n': |
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407 | /* FIXME: |
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408 | * What does C99 say about the overflow case here? */ |
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409 | if (qualifier == 'l') { |
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410 | long * ip = va_arg(args, long *); |
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411 | *ip = (str - buf); |
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412 | } else if (qualifier == 'Z' || qualifier == 'z') { |
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413 | size_t * ip = va_arg(args, size_t *); |
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414 | *ip = (str - buf); |
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415 | } else { |
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416 | int * ip = va_arg(args, int *); |
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417 | *ip = (str - buf); |
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418 | } |
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419 | continue; |
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420 | |
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421 | case '%': |
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422 | if (str <= end) |
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423 | *str = '%'; |
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424 | ++str; |
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425 | continue; |
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426 | |
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427 | /* integer number formats - set up the flags and "break" */ |
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428 | case 'o': |
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429 | base = 8; |
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430 | break; |
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431 | |
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432 | case 'X': |
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433 | flags |= LARGE; |
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434 | case 'x': |
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435 | base = 16; |
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436 | break; |
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437 | |
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438 | case 'd': |
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439 | case 'i': |
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440 | flags |= SIGN; |
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441 | case 'u': |
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442 | break; |
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443 | |
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444 | default: |
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445 | if (str <= end) |
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446 | *str = '%'; |
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447 | ++str; |
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448 | if (*fmt) { |
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449 | if (str <= end) |
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450 | *str = *fmt; |
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451 | ++str; |
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452 | } else { |
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453 | --fmt; |
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454 | } |
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455 | continue; |
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456 | } |
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457 | if (qualifier == 'L') |
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458 | num = va_arg(args, long long); |
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459 | else if (qualifier == 'l') { |
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460 | num = va_arg(args, unsigned long); |
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461 | if (flags & SIGN) |
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462 | num = (signed long) num; |
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463 | } else if (qualifier == 'Z' || qualifier == 'z') { |
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464 | num = va_arg(args, size_t); |
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465 | } else if (qualifier == 'h') { |
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466 | num = (unsigned short) va_arg(args, int); |
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467 | if (flags & SIGN) |
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468 | num = (signed short) num; |
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469 | } else { |
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470 | num = va_arg(args, unsigned int); |
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471 | if (flags & SIGN) |
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472 | num = (signed int) num; |
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473 | } |
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474 | |
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475 | str = number(str, end, num, base, |
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476 | field_width, precision, flags); |
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477 | } |
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478 | if (str <= end) |
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479 | *str = '\0'; |
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480 | else if (size > 0) |
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481 | /* don't write out a null byte if the buf size is zero */ |
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482 | *end = '\0'; |
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483 | /* the trailing null byte doesn't count towards the total |
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484 | * ++str; |
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485 | */ |
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486 | return str-buf; |
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487 | } |
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488 | |
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489 | EXPORT_SYMBOL(vsnprintf); |
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490 | |
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491 | /** |
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492 | * vscnprintf - Format a string and place it in a buffer |
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493 | * @buf: The buffer to place the result into |
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494 | * @size: The size of the buffer, including the trailing null space |
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495 | * @fmt: The format string to use |
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496 | * @args: Arguments for the format string |
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497 | * |
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498 | * The return value is the number of characters which have been written into |
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499 | * the @buf not including the trailing '\0'. If @size is <= 0 the function |
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500 | * returns 0. |
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501 | * |
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502 | * Call this function if you are already dealing with a va_list. |
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503 | * You probably want scnprintf instead. |
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504 | */ |
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505 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) |
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506 | { |
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507 | int i; |
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508 | |
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509 | i=vsnprintf(buf,size,fmt,args); |
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510 | return (i >= size) ? (size - 1) : i; |
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511 | } |
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512 | |
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513 | EXPORT_SYMBOL(vscnprintf); |
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514 | |
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515 | /** |
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516 | * snprintf - Format a string and place it in a buffer |
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517 | * @buf: The buffer to place the result into |
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518 | * @size: The size of the buffer, including the trailing null space |
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519 | * @fmt: The format string to use |
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520 | * @...: Arguments for the format string |
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521 | * |
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522 | * The return value is the number of characters which would be |
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523 | * generated for the given input, excluding the trailing null, |
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524 | * as per ISO C99. If the return is greater than or equal to |
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525 | * @size, the resulting string is truncated. |
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526 | */ |
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527 | int snprintf(char * buf, size_t size, const char *fmt, ...) |
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528 | { |
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529 | va_list args; |
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530 | int i; |
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531 | |
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532 | va_start(args, fmt); |
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533 | i=vsnprintf(buf,size,fmt,args); |
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534 | va_end(args); |
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535 | return i; |
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536 | } |
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537 | |
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538 | EXPORT_SYMBOL(snprintf); |
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539 | |
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540 | /** |
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541 | * scnprintf - Format a string and place it in a buffer |
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542 | * @buf: The buffer to place the result into |
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543 | * @size: The size of the buffer, including the trailing null space |
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544 | * @fmt: The format string to use |
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545 | * @...: Arguments for the format string |
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546 | * |
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547 | * The return value is the number of characters written into @buf not including |
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548 | * the trailing '\0'. If @size is <= 0 the function returns 0. If the return is |
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549 | * greater than or equal to @size, the resulting string is truncated. |
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550 | */ |
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551 | |
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552 | int scnprintf(char * buf, size_t size, const char *fmt, ...) |
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553 | { |
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554 | va_list args; |
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555 | int i; |
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556 | |
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557 | va_start(args, fmt); |
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558 | i = vsnprintf(buf, size, fmt, args); |
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559 | va_end(args); |
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560 | return (i >= size) ? (size - 1) : i; |
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561 | } |
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562 | EXPORT_SYMBOL(scnprintf); |
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563 | |
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564 | /* |
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565 | * Local variables: |
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566 | * mode: C |
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567 | * c-set-style: "BSD" |
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568 | * c-basic-offset: 4 |
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569 | * tab-width: 4 |
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570 | * indent-tabs-mode: nil |
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571 | * End: |
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572 | */ |
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