source: MondoRescue/branches/2.2.9/mindi-busybox/coreutils/printf.c@ 3320

Last change on this file since 3320 was 3320, checked in by Bruno Cornec, 9 years ago
  • Re-add (thanks git BTW) the 2.2.9 branch which had been destroyed in the move to 3.0
  • Property svn:eol-style set to native
File size: 9.6 KB
Line 
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 GPLv2 or later, see file LICENSE in this source tree.
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 "libbb.h"
42
43/* A note on bad input: neither bash 3.2 nor coreutils 6.10 stop on it.
44 * They report it:
45 * bash: printf: XXX: invalid number
46 * printf: XXX: expected a numeric value
47 * bash: printf: 123XXX: invalid number
48 * printf: 123XXX: value not completely converted
49 * but then they use 0 (or partially converted numeric prefix) as a value
50 * and continue. They exit with 1 in this case.
51 * Both accept insane field width/precision (e.g. %9999999999.9999999999d).
52 * Both print error message and assume 0 if %*.*f width/precision is "bad"
53 * (but negative numbers are not "bad").
54 * Both accept negative numbers for %u specifier.
55 *
56 * We try to be compatible.
57 */
58
59typedef void FAST_FUNC (*converter)(const char *arg, void *result);
60
61static int multiconvert(const char *arg, void *result, converter convert)
62{
63 if (*arg == '"' || *arg == '\'') {
64 arg = utoa((unsigned char)arg[1]);
65 }
66 errno = 0;
67 convert(arg, result);
68 if (errno) {
69 bb_error_msg("invalid number '%s'", arg);
70 return 1;
71 }
72 return 0;
73}
74
75static void FAST_FUNC conv_strtoull(const char *arg, void *result)
76{
77 *(unsigned long long*)result = bb_strtoull(arg, NULL, 0);
78 /* both coreutils 6.10 and bash 3.2:
79 * $ printf '%x\n' -2
80 * fffffffffffffffe
81 * Mimic that:
82 */
83 if (errno) {
84 *(unsigned long long*)result = bb_strtoll(arg, NULL, 0);
85 }
86}
87static void FAST_FUNC conv_strtoll(const char *arg, void *result)
88{
89 *(long long*)result = bb_strtoll(arg, NULL, 0);
90}
91static void FAST_FUNC conv_strtod(const char *arg, void *result)
92{
93 char *end;
94 /* Well, this one allows leading whitespace... so what? */
95 /* What I like much less is that "-" accepted too! :( */
96 *(double*)result = strtod(arg, &end);
97 if (end[0]) {
98 errno = ERANGE;
99 *(double*)result = 0;
100 }
101}
102
103/* Callers should check errno to detect errors */
104static unsigned long long my_xstrtoull(const char *arg)
105{
106 unsigned long long result;
107 if (multiconvert(arg, &result, conv_strtoull))
108 result = 0;
109 return result;
110}
111static long long my_xstrtoll(const char *arg)
112{
113 long long result;
114 if (multiconvert(arg, &result, conv_strtoll))
115 result = 0;
116 return result;
117}
118static double my_xstrtod(const char *arg)
119{
120 double result;
121 multiconvert(arg, &result, conv_strtod);
122 return result;
123}
124
125static void print_esc_string(const char *str)
126{
127 char c;
128 while ((c = *str) != '\0') {
129 str++;
130 if (c == '\\')
131 c = bb_process_escape_sequence(&str);
132 putchar(c);
133 }
134}
135
136static void print_direc(char *format, unsigned fmt_length,
137 int field_width, int precision,
138 const char *argument)
139{
140 long long llv;
141 double dv;
142 char saved;
143 char *have_prec, *have_width;
144
145 saved = format[fmt_length];
146 format[fmt_length] = '\0';
147
148 have_prec = strstr(format, ".*");
149 have_width = strchr(format, '*');
150 if (have_width - 1 == have_prec)
151 have_width = NULL;
152
153 errno = 0;
154
155 switch (format[fmt_length - 1]) {
156 case 'c':
157 printf(format, *argument);
158 break;
159 case 'd':
160 case 'i':
161 llv = my_xstrtoll(argument);
162 print_long:
163 if (!have_width) {
164 if (!have_prec)
165 printf(format, llv);
166 else
167 printf(format, precision, llv);
168 } else {
169 if (!have_prec)
170 printf(format, field_width, llv);
171 else
172 printf(format, field_width, precision, llv);
173 }
174 break;
175 case 'o':
176 case 'u':
177 case 'x':
178 case 'X':
179 llv = my_xstrtoull(argument);
180 /* cheat: unsigned long and long have same width, so... */
181 goto print_long;
182 case 's':
183 /* Are char* and long long the same? */
184 if (sizeof(argument) == sizeof(llv)) {
185 llv = (long long)(ptrdiff_t)argument;
186 goto print_long;
187 } else {
188 /* Hope compiler will optimize it out by moving call
189 * instruction after the ifs... */
190 if (!have_width) {
191 if (!have_prec)
192 printf(format, argument, /*unused:*/ argument, argument);
193 else
194 printf(format, precision, argument, /*unused:*/ argument);
195 } else {
196 if (!have_prec)
197 printf(format, field_width, argument, /*unused:*/ argument);
198 else
199 printf(format, field_width, precision, argument);
200 }
201 break;
202 }
203 case 'f':
204 case 'e':
205 case 'E':
206 case 'g':
207 case 'G':
208 dv = my_xstrtod(argument);
209 if (!have_width) {
210 if (!have_prec)
211 printf(format, dv);
212 else
213 printf(format, precision, dv);
214 } else {
215 if (!have_prec)
216 printf(format, field_width, dv);
217 else
218 printf(format, field_width, precision, dv);
219 }
220 break;
221 } /* switch */
222
223 format[fmt_length] = saved;
224}
225
226/* Handle params for "%*.*f". Negative numbers are ok (compat). */
227static int get_width_prec(const char *str)
228{
229 int v = bb_strtoi(str, NULL, 10);
230 if (errno) {
231 bb_error_msg("invalid number '%s'", str);
232 v = 0;
233 }
234 return v;
235}
236
237/* Print the text in FORMAT, using ARGV for arguments to any '%' directives.
238 Return advanced ARGV. */
239static char **print_formatted(char *f, char **argv, int *conv_err)
240{
241 char *direc_start; /* Start of % directive. */
242 unsigned direc_length; /* Length of % directive. */
243 int field_width; /* Arg to first '*' */
244 int precision; /* Arg to second '*' */
245 char **saved_argv = argv;
246
247 for (; *f; ++f) {
248 switch (*f) {
249 case '%':
250 direc_start = f++;
251 direc_length = 1;
252 field_width = precision = 0;
253 if (*f == '%') {
254 bb_putchar('%');
255 break;
256 }
257 if (*f == 'b') {
258 if (*argv) {
259 print_esc_string(*argv);
260 ++argv;
261 }
262 break;
263 }
264 if (strchr("-+ #", *f)) {
265 ++f;
266 ++direc_length;
267 }
268 if (*f == '*') {
269 ++f;
270 ++direc_length;
271 if (*argv)
272 field_width = get_width_prec(*argv++);
273 } else {
274 while (isdigit(*f)) {
275 ++f;
276 ++direc_length;
277 }
278 }
279 if (*f == '.') {
280 ++f;
281 ++direc_length;
282 if (*f == '*') {
283 ++f;
284 ++direc_length;
285 if (*argv)
286 precision = get_width_prec(*argv++);
287 } else {
288 while (isdigit(*f)) {
289 ++f;
290 ++direc_length;
291 }
292 }
293 }
294
295 /* Remove "lLhz" size modifiers, repeatedly.
296 * bash does not like "%lld", but coreutils
297 * happily takes even "%Llllhhzhhzd"!
298 * We are permissive like coreutils */
299 while ((*f | 0x20) == 'l' || *f == 'h' || *f == 'z') {
300 overlapping_strcpy(f, f + 1);
301 }
302 /* Add "ll" if integer modifier, then print */
303 {
304 static const char format_chars[] ALIGN1 = "diouxXfeEgGcs";
305 char *p = strchr(format_chars, *f);
306 /* needed - try "printf %" without it */
307 if (p == NULL) {
308 bb_error_msg("%s: invalid format", direc_start);
309 /* causes main() to exit with error */
310 return saved_argv - 1;
311 }
312 ++direc_length;
313 if (p - format_chars <= 5) {
314 /* it is one of "diouxX" */
315 p = xmalloc(direc_length + 3);
316 memcpy(p, direc_start, direc_length);
317 p[direc_length + 1] = p[direc_length - 1];
318 p[direc_length - 1] = 'l';
319 p[direc_length] = 'l';
320 //bb_error_msg("<%s>", p);
321 direc_length += 2;
322 direc_start = p;
323 } else {
324 p = NULL;
325 }
326 if (*argv) {
327 print_direc(direc_start, direc_length, field_width,
328 precision, *argv++);
329 } else {
330 print_direc(direc_start, direc_length, field_width,
331 precision, "");
332 }
333 *conv_err |= errno;
334 free(p);
335 }
336 break;
337 case '\\':
338 if (*++f == 'c') {
339 return saved_argv; /* causes main() to exit */
340 }
341 bb_putchar(bb_process_escape_sequence((const char **)&f));
342 f--;
343 break;
344 default:
345 putchar(*f);
346 }
347 }
348
349 return argv;
350}
351
352int printf_main(int argc UNUSED_PARAM, char **argv)
353{
354 int conv_err;
355 char *format;
356 char **argv2;
357
358 /* We must check that stdout is not closed.
359 * The reason for this is highly non-obvious.
360 * printf_main is used from shell.
361 * Shell must correctly handle 'printf "%s" foo'
362 * if stdout is closed. With stdio, output gets shoveled into
363 * stdout buffer, and even fflush cannot clear it out. It seems that
364 * even if libc receives EBADF on write attempts, it feels determined
365 * to output data no matter what. So it will try later,
366 * and possibly will clobber future output. Not good. */
367// TODO: check fcntl() & O_ACCMODE == O_WRONLY or O_RDWR?
368 if (fcntl(1, F_GETFL) == -1)
369 return 1; /* match coreutils 6.10 (sans error msg to stderr) */
370 //if (dup2(1, 1) != 1) - old way
371 // return 1;
372
373 /* bash builtin errors out on "printf '-%s-\n' foo",
374 * coreutils-6.9 works. Both work with "printf -- '-%s-\n' foo".
375 * We will mimic coreutils. */
376 if (argv[1] && argv[1][0] == '-' && argv[1][1] == '-' && !argv[1][2])
377 argv++;
378 if (!argv[1]) {
379 if (ENABLE_ASH_BUILTIN_PRINTF
380 && applet_name[0] != 'p'
381 ) {
382 bb_error_msg("usage: printf FORMAT [ARGUMENT...]");
383 return 2; /* bash compat */
384 }
385 bb_show_usage();
386 }
387
388 format = argv[1];
389 argv2 = argv + 2;
390
391 conv_err = 0;
392 do {
393 argv = argv2;
394 argv2 = print_formatted(format, argv, &conv_err);
395 } while (argv2 > argv && *argv2);
396
397 /* coreutils compat (bash doesn't do this):
398 if (*argv)
399 fprintf(stderr, "excess args ignored");
400 */
401
402 return (argv2 < argv) /* if true, print_formatted errored out */
403 || conv_err; /* print_formatted saw invalid number */
404}
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