[821] | 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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[1765] | 33 | The 'format' argument is re-used as many times as necessary
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[821] | 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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[1765] | 41 | #include "libbb.h"
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[821] | 42 |
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[1765] | 43 | typedef void (*converter)(const char *arg, void *result);
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[821] | 44 |
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[1765] | 45 | static void multiconvert(const char *arg, void *result, converter convert)
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[821] | 46 | {
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[1765] | 47 | char s[sizeof(int)*3 + 2];
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| 48 |
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[821] | 49 | if (*arg == '"' || *arg == '\'') {
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[1765] | 50 | sprintf(s, "%d", (unsigned char)arg[1]);
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| 51 | arg = s;
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[821] | 52 | }
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[1765] | 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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[821] | 57 | }
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| 58 |
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[1765] | 59 | static void conv_strtoul(const char *arg, void *result)
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[821] | 60 | {
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[1765] | 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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[821] | 78 | unsigned long result;
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[1765] | 79 | multiconvert(arg, &result, conv_strtoul);
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[821] | 80 | return result;
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| 81 | }
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| 82 |
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[1765] | 83 | static long my_xstrtol(const char *arg)
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[821] | 84 | {
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| 85 | long result;
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[1765] | 86 | multiconvert(arg, &result, conv_strtol);
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[821] | 87 | return result;
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| 88 | }
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| 89 |
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[1765] | 90 | static double my_xstrtod(const char *arg)
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[821] | 91 | {
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| 92 | double result;
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[1765] | 93 | multiconvert(arg, &result, conv_strtod);
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[821] | 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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[1765] | 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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[821] | 112 | {
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[1765] | 113 | char *p; /* Null-terminated copy of % directive. */
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[821] | 114 |
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[1765] | 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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[821] | 118 |
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[1765] | 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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[821] | 183 | }
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| 184 |
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[1765] | 185 | free(p);
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[821] | 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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[1765] | 189 | arguments to any '%' directives.
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[821] | 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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[1765] | 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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[821] | 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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[1765] | 227 | field_width = my_xstrtoul(*argv);
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[821] | 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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[1765] | 232 | } else {
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[821] | 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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[1765] | 237 | }
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[821] | 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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[1765] | 245 | precision = my_xstrtoul(*argv);
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[821] | 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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[1765] | 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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[821] | 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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[1765] | 288 | int printf_main(int argc, char **argv);
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| 289 | int printf_main(int argc, char **argv)
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[821] | 290 | {
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[1765] | 291 | char *format;
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| 292 | int args_used;
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[821] | 293 |
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[1765] | 294 | if (argc <= 1 || argv[1][0] == '-') {
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| 295 | bb_show_usage();
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| 296 | }
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[821] | 297 |
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[1765] | 298 | format = argv[1];
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| 299 | argc -= 2;
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| 300 | argv += 2;
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[821] | 301 |
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[1765] | 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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[821] | 307 |
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[1765] | 308 | /* if (argc > 0)
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| 309 | fprintf(stderr, "excess args ignored");
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| 310 | */
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[821] | 311 |
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[1765] | 312 | return EXIT_SUCCESS;
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[821] | 313 | }
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