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    Contents of /trunk/mkinitrd-magellan/busybox/coreutils/printf.c

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    Revision 532 - (show annotations) (download)
    Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
    File MIME type: text/plain
    File size: 6625 byte(s) 
    -import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
    1 /* vi: set sw=4 ts=4: */
    2 /* printf - format and print data
    3
    4 Copyright 1999 Dave Cinege
    5 Portions copyright (C) 1990-1996 Free Software Foundation, Inc.
    6
    7 Licensed under GPL v2 or later, see file LICENSE in this tarball for details.
    8 */
    9
    10 /* Usage: printf format [argument...]
    11
    12 A front end to the printf function that lets it be used from the shell.
    13
    14 Backslash escapes:
    15
    16 \" = double quote
    17 \\ = backslash
    18 \a = alert (bell)
    19 \b = backspace
    20 \c = produce no further output
    21 \f = form feed
    22 \n = new line
    23 \r = carriage return
    24 \t = horizontal tab
    25 \v = vertical tab
    26 \0ooo = octal number (ooo is 0 to 3 digits)
    27 \xhhh = hexadecimal number (hhh is 1 to 3 digits)
    28
    29 Additional directive:
    30
    31 %b = print an argument string, interpreting backslash escapes
    32
    33 The 'format' argument is re-used as many times as necessary
    34 to convert all of the given arguments.
    35
    36 David MacKenzie <djm@gnu.ai.mit.edu> */
    37
    38
    39 // 19990508 Busy Boxed! Dave Cinege
    40
    41 #include "busybox.h"
    42
    43 static int print_formatted(char *format, int argc, char **argv);
    44 static void print_direc(char *start, size_t length,
    45 int field_width, int precision, char *argument);
    46
    47 typedef void (*converter)(char *arg, void *result);
    48
    49 static void multiconvert(char *arg, void *result, converter convert)
    50 {
    51 char s[16];
    52 if (*arg == '"' || *arg == '\'') {
    53 sprintf(s, "%d", (unsigned char)arg[1]);
    54 arg = s;
    55 }
    56 convert(arg, result);
    57 if (errno) /* Huh, looks strange... bug? */
    58 fputs(arg, stderr);
    59 }
    60
    61 static void conv_strtoul(char *arg, void *result)
    62 {
    63 *(unsigned long*)result = bb_strtoul(arg, NULL, 10);
    64 }
    65 static void conv_strtol(char *arg, void *result)
    66 {
    67 *(long*)result = bb_strtol(arg, NULL, 10);
    68 }
    69 static void conv_strtod(char *arg, void *result)
    70 {
    71 char *end;
    72 /* Well, this one allows leading whitespace... so what */
    73 /* What I like much less is that "-" is accepted too! :( */
    74 *(double*)result = strtod(arg, &end);
    75 if (end[0]) errno = ERANGE;
    76 }
    77
    78 static unsigned long my_xstrtoul(char *arg)
    79 {
    80 unsigned long result;
    81 multiconvert(arg, &result, conv_strtoul);
    82 return result;
    83 }
    84
    85 static long my_xstrtol(char *arg)
    86 {
    87 long result;
    88 multiconvert(arg, &result, conv_strtol);
    89 return result;
    90 }
    91
    92 static double my_xstrtod(char *arg)
    93 {
    94 double result;
    95 multiconvert(arg, &result, conv_strtod);
    96 return result;
    97 }
    98
    99 static void print_esc_string(char *str)
    100 {
    101 for (; *str; str++) {
    102 if (*str == '\\') {
    103 str++;
    104 putchar(bb_process_escape_sequence((const char **)&str));
    105 } else {
    106 putchar(*str);
    107 }
    108
    109 }
    110 }
    111
    112 int printf_main(int argc, char **argv)
    113 {
    114 char *format;
    115 int args_used;
    116
    117 if (argc <= 1 || argv[1][0] == '-') {
    118 bb_show_usage();
    119 }
    120
    121 format = argv[1];
    122 argc -= 2;
    123 argv += 2;
    124
    125 do {
    126 args_used = print_formatted(format, argc, argv);
    127 argc -= args_used;
    128 argv += args_used;
    129 }
    130 while (args_used > 0 && argc > 0);
    131
    132 /* if (argc > 0)
    133 fprintf(stderr, "excess args ignored");
    134 */
    135
    136 return EXIT_SUCCESS;
    137 }
    138
    139 /* Print the text in FORMAT, using ARGV (with ARGC elements) for
    140 arguments to any '%' directives.
    141 Return the number of elements of ARGV used. */
    142
    143 static int print_formatted(char *format, int argc, char **argv)
    144 {
    145 int save_argc = argc; /* Preserve original value. */
    146 char *f; /* Pointer into 'format'. */
    147 char *direc_start; /* Start of % directive. */
    148 size_t direc_length; /* Length of % directive. */
    149 int field_width; /* Arg to first '*', or -1 if none. */
    150 int precision; /* Arg to second '*', or -1 if none. */
    151
    152 for (f = format; *f; ++f) {
    153 switch (*f) {
    154 case '%':
    155 direc_start = f++;
    156 direc_length = 1;
    157 field_width = precision = -1;
    158 if (*f == '%') {
    159 putchar('%');
    160 break;
    161 }
    162 if (*f == 'b') {
    163 if (argc > 0) {
    164 print_esc_string(*argv);
    165 ++argv;
    166 --argc;
    167 }
    168 break;
    169 }
    170 if (strchr("-+ #", *f)) {
    171 ++f;
    172 ++direc_length;
    173 }
    174 if (*f == '*') {
    175 ++f;
    176 ++direc_length;
    177 if (argc > 0) {
    178 field_width = my_xstrtoul(*argv);
    179 ++argv;
    180 --argc;
    181 } else
    182 field_width = 0;
    183 } else
    184 while (isdigit(*f)) {
    185 ++f;
    186 ++direc_length;
    187 }
    188 if (*f == '.') {
    189 ++f;
    190 ++direc_length;
    191 if (*f == '*') {
    192 ++f;
    193 ++direc_length;
    194 if (argc > 0) {
    195 precision = my_xstrtoul(*argv);
    196 ++argv;
    197 --argc;
    198 } else
    199 precision = 0;
    200 } else
    201 while (isdigit(*f)) {
    202 ++f;
    203 ++direc_length;
    204 }
    205 }
    206 if (*f == 'l' || *f == 'L' || *f == 'h') {
    207 ++f;
    208 ++direc_length;
    209 }
    210 /*
    211 if (!strchr ("diouxXfeEgGcs", *f))
    212 fprintf(stderr, "%%%c: invalid directive", *f);
    213 */
    214 ++direc_length;
    215 if (argc > 0) {
    216 print_direc(direc_start, direc_length, field_width,
    217 precision, *argv);
    218 ++argv;
    219 --argc;
    220 } else
    221 print_direc(direc_start, direc_length, field_width,
    222 precision, "");
    223 break;
    224
    225 case '\\':
    226 if (*++f == 'c')
    227 exit(0);
    228 putchar(bb_process_escape_sequence((const char **)&f));
    229 f--;
    230 break;
    231
    232 default:
    233 putchar(*f);
    234 }
    235 }
    236
    237 return save_argc - argc;
    238 }
    239
    240 static void
    241 print_direc(char *start, size_t length, int field_width, int precision,
    242 char *argument)
    243 {
    244 char *p; /* Null-terminated copy of % directive. */
    245
    246 p = xmalloc((unsigned) (length + 1));
    247 strncpy(p, start, length);
    248 p[length] = 0;
    249
    250 switch (p[length - 1]) {
    251 case 'd':
    252 case 'i':
    253 if (field_width < 0) {
    254 if (precision < 0)
    255 printf(p, my_xstrtol(argument));
    256 else
    257 printf(p, precision, my_xstrtol(argument));
    258 } else {
    259 if (precision < 0)
    260 printf(p, field_width, my_xstrtol(argument));
    261 else
    262 printf(p, field_width, precision, my_xstrtol(argument));
    263 }
    264 break;
    265
    266 case 'o':
    267 case 'u':
    268 case 'x':
    269 case 'X':
    270 if (field_width < 0) {
    271 if (precision < 0)
    272 printf(p, my_xstrtoul(argument));
    273 else
    274 printf(p, precision, my_xstrtoul(argument));
    275 } else {
    276 if (precision < 0)
    277 printf(p, field_width, my_xstrtoul(argument));
    278 else
    279 printf(p, field_width, precision, my_xstrtoul(argument));
    280 }
    281 break;
    282
    283 case 'f':
    284 case 'e':
    285 case 'E':
    286 case 'g':
    287 case 'G':
    288 if (field_width < 0) {
    289 if (precision < 0)
    290 printf(p, my_xstrtod(argument));
    291 else
    292 printf(p, precision, my_xstrtod(argument));
    293 } else {
    294 if (precision < 0)
    295 printf(p, field_width, my_xstrtod(argument));
    296 else
    297 printf(p, field_width, precision, my_xstrtod(argument));
    298 }
    299 break;
    300
    301 case 'c':
    302 printf(p, *argument);
    303 break;
    304
    305 case 's':
    306 if (field_width < 0) {
    307 if (precision < 0)
    308 printf(p, argument);
    309 else
    310 printf(p, precision, argument);
    311 } else {
    312 if (precision < 0)
    313 printf(p, field_width, argument);
    314 else
    315 printf(p, field_width, precision, argument);
    316 }
    317 break;
    318 }
    319
    320 free(p);
    321 }