1 | /* vi: set sw=4 ts=4: */
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2 | /* printf - format and print data
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3 |
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4 | Copyright 1999 Dave Cinege
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5 | Portions copyright (C) 1990-1996 Free Software Foundation, Inc.
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6 |
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7 | Licensed under GPL v2 or later, see file LICENSE in this tarball for details.
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8 | */
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9 |
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10 | /* Usage: printf format [argument...]
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11 |
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12 | A front end to the printf function that lets it be used from the shell.
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13 |
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14 | Backslash escapes:
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15 |
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16 | \" = double quote
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17 | \\ = backslash
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18 | \a = alert (bell)
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19 | \b = backspace
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20 | \c = produce no further output
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21 | \f = form feed
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22 | \n = new line
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23 | \r = carriage return
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24 | \t = horizontal tab
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25 | \v = vertical tab
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26 | \0ooo = octal number (ooo is 0 to 3 digits)
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27 | \xhhh = hexadecimal number (hhh is 1 to 3 digits)
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28 |
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29 | Additional directive:
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30 |
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31 | %b = print an argument string, interpreting backslash escapes
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32 |
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33 | The 'format' argument is re-used as many times as necessary
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34 | to convert all of the given arguments.
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35 |
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36 | David MacKenzie <djm@gnu.ai.mit.edu> */
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37 |
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38 |
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39 | // 19990508 Busy Boxed! Dave Cinege
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40 |
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41 | #include "libbb.h"
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42 |
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43 | typedef void (*converter)(const char *arg, void *result);
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44 |
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45 | static void multiconvert(const char *arg, void *result, converter convert)
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46 | {
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47 | char s[sizeof(int)*3 + 2];
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48 |
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49 | if (*arg == '"' || *arg == '\'') {
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50 | sprintf(s, "%d", (unsigned char)arg[1]);
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51 | arg = s;
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52 | }
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53 | convert(arg, result);
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54 | /* if there was conversion error, print unconverted string */
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55 | if (errno)
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56 | fputs(arg, stderr);
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57 | }
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58 |
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59 | static void conv_strtoul(const char *arg, void *result)
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60 | {
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61 | *(unsigned long*)result = bb_strtoul(arg, NULL, 0);
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62 | }
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63 | static void conv_strtol(const char *arg, void *result)
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64 | {
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65 | *(long*)result = bb_strtol(arg, NULL, 0);
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66 | }
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67 | static void conv_strtod(const char *arg, void *result)
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68 | {
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69 | char *end;
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70 | /* Well, this one allows leading whitespace... so what */
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71 | /* What I like much less is that "-" is accepted too! :( */
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72 | *(double*)result = strtod(arg, &end);
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73 | if (end[0]) errno = ERANGE;
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74 | }
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75 |
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76 | static unsigned long my_xstrtoul(const char *arg)
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77 | {
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78 | unsigned long result;
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79 | multiconvert(arg, &result, conv_strtoul);
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80 | return result;
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81 | }
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82 |
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83 | static long my_xstrtol(const char *arg)
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84 | {
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85 | long result;
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86 | multiconvert(arg, &result, conv_strtol);
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87 | return result;
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88 | }
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89 |
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90 | static double my_xstrtod(const char *arg)
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91 | {
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92 | double result;
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93 | multiconvert(arg, &result, conv_strtod);
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94 | return result;
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95 | }
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96 |
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97 | static void print_esc_string(char *str)
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98 | {
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99 | for (; *str; str++) {
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100 | if (*str == '\\') {
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101 | str++;
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102 | putchar(bb_process_escape_sequence((const char **)&str));
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103 | } else {
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104 | putchar(*str);
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105 | }
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106 |
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107 | }
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108 | }
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109 |
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110 | static void print_direc(char *start, size_t length, int field_width, int precision,
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111 | const char *argument)
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112 | {
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113 | char *p; /* Null-terminated copy of % directive. */
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114 |
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115 | p = xmalloc((unsigned) (length + 1));
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116 | strncpy(p, start, length);
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117 | p[length] = 0;
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118 |
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119 | switch (p[length - 1]) {
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120 | case 'd':
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121 | case 'i':
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122 | if (field_width < 0) {
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123 | if (precision < 0)
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124 | printf(p, my_xstrtol(argument));
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125 | else
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126 | printf(p, precision, my_xstrtol(argument));
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127 | } else {
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128 | if (precision < 0)
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129 | printf(p, field_width, my_xstrtol(argument));
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130 | else
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131 | printf(p, field_width, precision, my_xstrtol(argument));
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132 | }
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133 | break;
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134 | case 'o':
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135 | case 'u':
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136 | case 'x':
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137 | case 'X':
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138 | if (field_width < 0) {
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139 | if (precision < 0)
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140 | printf(p, my_xstrtoul(argument));
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141 | else
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142 | printf(p, precision, my_xstrtoul(argument));
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143 | } else {
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144 | if (precision < 0)
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145 | printf(p, field_width, my_xstrtoul(argument));
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146 | else
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147 | printf(p, field_width, precision, my_xstrtoul(argument));
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148 | }
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149 | break;
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150 | case 'f':
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151 | case 'e':
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152 | case 'E':
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153 | case 'g':
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154 | case 'G':
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155 | if (field_width < 0) {
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156 | if (precision < 0)
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157 | printf(p, my_xstrtod(argument));
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158 | else
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159 | printf(p, precision, my_xstrtod(argument));
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160 | } else {
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161 | if (precision < 0)
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162 | printf(p, field_width, my_xstrtod(argument));
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163 | else
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164 | printf(p, field_width, precision, my_xstrtod(argument));
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165 | }
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166 | break;
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167 | case 'c':
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168 | printf(p, *argument);
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169 | break;
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170 | case 's':
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171 | if (field_width < 0) {
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172 | if (precision < 0)
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173 | printf(p, argument);
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174 | else
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175 | printf(p, precision, argument);
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176 | } else {
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177 | if (precision < 0)
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178 | printf(p, field_width, argument);
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179 | else
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180 | printf(p, field_width, precision, argument);
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181 | }
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182 | break;
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183 | }
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184 |
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185 | free(p);
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186 | }
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187 |
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188 | /* Print the text in FORMAT, using ARGV (with ARGC elements) for
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189 | arguments to any '%' directives.
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190 | Return the number of elements of ARGV used. */
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191 |
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192 | static int print_formatted(char *format, int argc, char **argv)
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193 | {
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194 | int save_argc = argc; /* Preserve original value. */
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195 | char *f; /* Pointer into 'format'. */
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196 | char *direc_start; /* Start of % directive. */
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197 | size_t direc_length; /* Length of % directive. */
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198 | int field_width; /* Arg to first '*', or -1 if none. */
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199 | int precision; /* Arg to second '*', or -1 if none. */
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200 |
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201 | for (f = format; *f; ++f) {
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202 | switch (*f) {
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203 | case '%':
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204 | direc_start = f++;
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205 | direc_length = 1;
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206 | field_width = precision = -1;
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207 | if (*f == '%') {
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208 | putchar('%');
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209 | break;
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210 | }
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211 | if (*f == 'b') {
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212 | if (argc > 0) {
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213 | print_esc_string(*argv);
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214 | ++argv;
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215 | --argc;
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216 | }
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217 | break;
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218 | }
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219 | if (strchr("-+ #", *f)) {
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220 | ++f;
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221 | ++direc_length;
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222 | }
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223 | if (*f == '*') {
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224 | ++f;
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225 | ++direc_length;
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226 | if (argc > 0) {
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227 | field_width = my_xstrtoul(*argv);
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228 | ++argv;
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229 | --argc;
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230 | } else
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231 | field_width = 0;
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232 | } else {
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233 | while (isdigit(*f)) {
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234 | ++f;
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235 | ++direc_length;
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236 | }
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237 | }
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238 | if (*f == '.') {
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239 | ++f;
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240 | ++direc_length;
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241 | if (*f == '*') {
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242 | ++f;
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243 | ++direc_length;
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244 | if (argc > 0) {
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245 | precision = my_xstrtoul(*argv);
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246 | ++argv;
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247 | --argc;
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248 | } else
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249 | precision = 0;
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250 | } else
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251 | while (isdigit(*f)) {
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252 | ++f;
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253 | ++direc_length;
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254 | }
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255 | }
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256 | if (*f == 'l' || *f == 'L' || *f == 'h') {
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257 | ++f;
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258 | ++direc_length;
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259 | }
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260 | /*
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261 | if (!strchr ("diouxXfeEgGcs", *f))
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262 | fprintf(stderr, "%%%c: invalid directive", *f);
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263 | */
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264 | ++direc_length;
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265 | if (argc > 0) {
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266 | print_direc(direc_start, direc_length, field_width,
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267 | precision, *argv);
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268 | ++argv;
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269 | --argc;
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270 | } else
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271 | print_direc(direc_start, direc_length, field_width,
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272 | precision, "");
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273 | break;
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274 | case '\\':
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275 | if (*++f == 'c')
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276 | exit(0);
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277 | putchar(bb_process_escape_sequence((const char **)&f));
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278 | f--;
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279 | break;
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280 | default:
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281 | putchar(*f);
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282 | }
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283 | }
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284 |
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285 | return save_argc - argc;
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286 | }
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287 |
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288 | int printf_main(int argc, char **argv);
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289 | int printf_main(int argc, char **argv)
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290 | {
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291 | char *format;
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292 | int args_used;
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293 |
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294 | if (argc <= 1 || argv[1][0] == '-') {
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295 | bb_show_usage();
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296 | }
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297 |
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298 | format = argv[1];
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299 | argc -= 2;
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300 | argv += 2;
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301 |
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302 | do {
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303 | args_used = print_formatted(format, argc, argv);
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304 | argc -= args_used;
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305 | argv += args_used;
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306 | } while (args_used > 0 && argc > 0);
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307 |
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308 | /* if (argc > 0)
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309 | fprintf(stderr, "excess args ignored");
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310 | */
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311 |
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312 | return EXIT_SUCCESS;
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313 | }
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