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 <unistd.h>
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42 | #include <stdio.h>
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43 | #include <sys/types.h>
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44 | #include <string.h>
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45 | #include <errno.h>
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46 | #include <stdlib.h>
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47 | #include <fcntl.h>
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48 | #include <ctype.h>
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49 | #include <assert.h>
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50 | #include "busybox.h"
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51 |
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52 | static int print_formatted (char *format, int argc, char **argv);
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53 | static void print_direc (char *start, size_t length,
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54 | int field_width, int precision, char *argument);
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55 |
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56 | typedef int (*converter)(char *arg, void *result);
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57 | static void multiconvert(char *arg, void *result, converter convert)
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58 | {
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59 | char s[16];
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60 | if (*arg == '"' || *arg == '\'') {
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61 | sprintf(s,"%d",(unsigned)*(++arg));
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62 | arg=s;
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63 | }
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64 | if(convert(arg,result)) fprintf(stderr, "%s", arg);
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65 | }
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66 |
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67 | static unsigned long xstrtoul(char *arg)
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68 | {
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69 | unsigned long result;
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70 |
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71 | multiconvert(arg,&result, (converter)safe_strtoul);
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72 | return result;
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73 | }
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74 |
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75 | static long xstrtol(char *arg)
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76 | {
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77 | long result;
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78 | multiconvert(arg, &result, (converter)safe_strtol);
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79 | return result;
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80 | }
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81 |
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82 | static double xstrtod(char *arg)
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83 | {
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84 | double result;
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85 | multiconvert(arg, &result, (converter)safe_strtod);
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86 | return result;
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87 | }
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88 |
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89 | static void print_esc_string(char *str)
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90 | {
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91 | for (; *str; str++) {
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92 | if (*str == '\\') {
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93 | str++;
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94 | putchar(bb_process_escape_sequence((const char **)&str));
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95 | } else {
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96 | putchar(*str);
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97 | }
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98 |
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99 | }
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100 | }
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101 |
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102 | int printf_main(int argc, char **argv)
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103 | {
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104 | char *format;
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105 | int args_used;
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106 |
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107 | if (argc <= 1 || **(argv + 1) == '-') {
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108 | bb_show_usage();
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109 | }
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110 |
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111 | format = argv[1];
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112 | argc -= 2;
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113 | argv += 2;
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114 |
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115 | do {
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116 | args_used = print_formatted(format, argc, argv);
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117 | argc -= args_used;
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118 | argv += args_used;
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119 | }
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120 | while (args_used > 0 && argc > 0);
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121 |
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122 | /*
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123 | if (argc > 0)
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124 | fprintf(stderr, "excess args ignored");
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125 | */
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126 |
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127 | return EXIT_SUCCESS;
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128 | }
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129 |
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130 | /* Print the text in FORMAT, using ARGV (with ARGC elements) for
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131 | arguments to any `%' directives.
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132 | Return the number of elements of ARGV used. */
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133 |
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134 | static int print_formatted(char *format, int argc, char **argv)
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135 | {
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136 | int save_argc = argc; /* Preserve original value. */
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137 | char *f; /* Pointer into `format'. */
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138 | char *direc_start; /* Start of % directive. */
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139 | size_t direc_length; /* Length of % directive. */
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140 | int field_width; /* Arg to first '*', or -1 if none. */
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141 | int precision; /* Arg to second '*', or -1 if none. */
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142 |
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143 | for (f = format; *f; ++f) {
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144 | switch (*f) {
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145 | case '%':
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146 | direc_start = f++;
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147 | direc_length = 1;
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148 | field_width = precision = -1;
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149 | if (*f == '%') {
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150 | putchar('%');
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151 | break;
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152 | }
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153 | if (*f == 'b') {
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154 | if (argc > 0) {
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155 | print_esc_string(*argv);
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156 | ++argv;
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157 | --argc;
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158 | }
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159 | break;
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160 | }
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161 | if (strchr("-+ #", *f)) {
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162 | ++f;
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163 | ++direc_length;
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164 | }
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165 | if (*f == '*') {
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166 | ++f;
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167 | ++direc_length;
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168 | if (argc > 0) {
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169 | field_width = xstrtoul(*argv);
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170 | ++argv;
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171 | --argc;
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172 | } else
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173 | field_width = 0;
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174 | } else
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175 | while (isdigit(*f)) {
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176 | ++f;
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177 | ++direc_length;
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178 | }
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179 | if (*f == '.') {
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180 | ++f;
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181 | ++direc_length;
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182 | if (*f == '*') {
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183 | ++f;
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184 | ++direc_length;
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185 | if (argc > 0) {
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186 | precision = xstrtoul(*argv);
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187 | ++argv;
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188 | --argc;
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189 | } else
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190 | precision = 0;
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191 | } else
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192 | while (isdigit(*f)) {
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193 | ++f;
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194 | ++direc_length;
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195 | }
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196 | }
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197 | if (*f == 'l' || *f == 'L' || *f == 'h') {
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198 | ++f;
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199 | ++direc_length;
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200 | }
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201 | /*
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202 | if (!strchr ("diouxXfeEgGcs", *f))
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203 | fprintf(stderr, "%%%c: invalid directive", *f);
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204 | */
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205 | ++direc_length;
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206 | if (argc > 0) {
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207 | print_direc(direc_start, direc_length, field_width,
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208 | precision, *argv);
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209 | ++argv;
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210 | --argc;
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211 | } else
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212 | print_direc(direc_start, direc_length, field_width,
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213 | precision, "");
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214 | break;
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215 |
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216 | case '\\':
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217 | if (*++f == 'c')
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218 | exit(0);
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219 | putchar(bb_process_escape_sequence((const char **)&f));
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220 | f--;
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221 | break;
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222 |
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223 | default:
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224 | putchar(*f);
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225 | }
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226 | }
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227 |
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228 | return save_argc - argc;
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229 | }
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230 |
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231 | static void
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232 | print_direc(char *start, size_t length, int field_width, int precision,
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233 | char *argument)
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234 | {
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235 | char *p; /* Null-terminated copy of % directive. */
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236 |
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237 | p = xmalloc((unsigned) (length + 1));
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238 | strncpy(p, start, length);
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239 | p[length] = 0;
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240 |
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241 | switch (p[length - 1]) {
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242 | case 'd':
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243 | case 'i':
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244 | if (field_width < 0) {
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245 | if (precision < 0)
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246 | printf(p, xstrtol(argument));
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247 | else
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248 | printf(p, precision, xstrtol(argument));
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249 | } else {
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250 | if (precision < 0)
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251 | printf(p, field_width, xstrtol(argument));
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252 | else
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253 | printf(p, field_width, precision, xstrtol(argument));
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254 | }
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255 | break;
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256 |
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257 | case 'o':
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258 | case 'u':
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259 | case 'x':
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260 | case 'X':
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261 | if (field_width < 0) {
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262 | if (precision < 0)
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263 | printf(p, xstrtoul(argument));
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264 | else
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265 | printf(p, precision, xstrtoul(argument));
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266 | } else {
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267 | if (precision < 0)
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268 | printf(p, field_width, xstrtoul(argument));
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269 | else
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270 | printf(p, field_width, precision, xstrtoul(argument));
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271 | }
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272 | break;
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273 |
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274 | case 'f':
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275 | case 'e':
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276 | case 'E':
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277 | case 'g':
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278 | case 'G':
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279 | if (field_width < 0) {
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280 | if (precision < 0)
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281 | printf(p, xstrtod(argument));
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282 | else
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283 | printf(p, precision, xstrtod(argument));
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284 | } else {
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285 | if (precision < 0)
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286 | printf(p, field_width, xstrtod(argument));
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287 | else
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288 | printf(p, field_width, precision, xstrtod(argument));
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289 | }
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290 | break;
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291 |
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292 | case 'c':
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293 | printf(p, *argument);
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294 | break;
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295 |
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296 | case 's':
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297 | if (field_width < 0) {
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298 | if (precision < 0)
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299 | printf(p, argument);
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300 | else
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301 | printf(p, precision, argument);
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302 | } else {
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303 | if (precision < 0)
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304 | printf(p, field_width, argument);
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305 | else
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306 | printf(p, field_width, precision, argument);
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307 | }
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308 | break;
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309 | }
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310 |
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311 | free(p);
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312 | }
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