[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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| 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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