source: trunk/ash/bltin/printf.c@ 2580

Last change on this file since 2580 was 2460, checked in by bird, 20 years ago

NetBSD sh 2005-07-03.
File size: 14.4 KB
Line 
1/* $NetBSD: printf.c,v 1.31 2005/03/22 23:55:46 dsl Exp $ */
2
3/*
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#ifndef lint
34#if !defined(BUILTIN) && !defined(SHELL)
35__COPYRIGHT("@(#) Copyright (c) 1989, 1993\n\
36 The Regents of the University of California. All rights reserved.\n");
37#endif
38#endif
39
40#ifndef lint
41#if 0
42static char sccsid[] = "@(#)printf.c 8.2 (Berkeley) 3/22/95";
43#else
44__RCSID("$NetBSD: printf.c,v 1.31 2005/03/22 23:55:46 dsl Exp $");
45#endif
46#endif /* not lint */
47
48#include <sys/types.h>
49
50#include <ctype.h>
51#include <err.h>
52#include <errno.h>
53#include <inttypes.h>
54#include <limits.h>
55#include <locale.h>
56#include <stdarg.h>
57#include <stdio.h>
58#include <stdlib.h>
59#include <string.h>
60#include <unistd.h>
61
62#ifdef __GNUC__
63#define ESCAPE '\e'
64#else
65#define ESCAPE 033
66#endif
67
68static void conv_escape_str(char *, void (*)(int));
69static char *conv_escape(char *, char *);
70static char *conv_expand(const char *);
71static int getchr(void);
72static double getdouble(void);
73static int getwidth(void);
74static intmax_t getintmax(void);
75static uintmax_t getuintmax(void);
76static char *getstr(void);
77static char *mklong(const char *, int);
78static void check_conversion(const char *, const char *);
79static void usage(void);
80
81static void b_count(int);
82static void b_output(int);
83static size_t b_length;
84static char *b_fmt;
85
86static int rval;
87static char **gargv;
88
89#ifdef BUILTIN /* csh builtin */
90#define main progprintf
91#endif
92
93#ifdef SHELL /* sh (aka ash) builtin */
94#define main printfcmd
95#include "../../bin/sh/bltin/bltin.h"
96#endif /* SHELL */
97
98#define PF(f, func) { \
99 if (fieldwidth != -1) { \
100 if (precision != -1) \
101 (void)printf(f, fieldwidth, precision, func); \
102 else \
103 (void)printf(f, fieldwidth, func); \
104 } else if (precision != -1) \
105 (void)printf(f, precision, func); \
106 else \
107 (void)printf(f, func); \
108}
109
110#define APF(cpp, f, func) { \
111 if (fieldwidth != -1) { \
112 if (precision != -1) \
113 (void)asprintf(cpp, f, fieldwidth, precision, func); \
114 else \
115 (void)asprintf(cpp, f, fieldwidth, func); \
116 } else if (precision != -1) \
117 (void)asprintf(cpp, f, precision, func); \
118 else \
119 (void)asprintf(cpp, f, func); \
120}
121
122int main(int, char **);
123int main(int argc, char *argv[])
124{
125 char *fmt, *start;
126 int fieldwidth, precision;
127 char nextch;
128 char *format;
129 int ch;
130
131#if !defined(SHELL) && !defined(BUILTIN)
132 (void)setlocale (LC_ALL, "");
133#endif
134
135 while ((ch = getopt(argc, argv, "")) != -1) {
136 switch (ch) {
137 case '?':
138 default:
139 usage();
140 return 1;
141 }
142 }
143 argc -= optind;
144 argv += optind;
145
146 if (argc < 1) {
147 usage();
148 return 1;
149 }
150
151 format = *argv;
152 gargv = ++argv;
153
154#define SKIP1 "#-+ 0"
155#define SKIP2 "*0123456789"
156 do {
157 /*
158 * Basic algorithm is to scan the format string for conversion
159 * specifications -- once one is found, find out if the field
160 * width or precision is a '*'; if it is, gather up value.
161 * Note, format strings are reused as necessary to use up the
162 * provided arguments, arguments of zero/null string are
163 * provided to use up the format string.
164 */
165
166 /* find next format specification */
167 for (fmt = format; (ch = *fmt++) != '\0';) {
168 if (ch == '\\') {
169 char c_ch;
170 fmt = conv_escape(fmt, &c_ch);
171 putchar(c_ch);
172 continue;
173 }
174 if (ch != '%' || (*fmt == '%' && ++fmt)) {
175 (void)putchar(ch);
176 continue;
177 }
178
179 /* Ok - we've found a format specification,
180 Save its address for a later printf(). */
181 start = fmt - 1;
182
183 /* skip to field width */
184 fmt += strspn(fmt, SKIP1);
185 fieldwidth = *fmt == '*' ? getwidth() : -1;
186
187 /* skip to possible '.', get following precision */
188 fmt += strspn(fmt, SKIP2);
189 if (*fmt == '.')
190 ++fmt;
191 precision = *fmt == '*' ? getwidth() : -1;
192
193 fmt += strspn(fmt, SKIP2);
194
195 ch = *fmt;
196 if (!ch) {
197 warnx("missing format character");
198 return (1);
199 }
200 /* null terminate format string to we can use it
201 as an argument to printf. */
202 nextch = fmt[1];
203 fmt[1] = 0;
204 switch (ch) {
205
206 case 'B': {
207 const char *p = conv_expand(getstr());
208 *fmt = 's';
209 PF(start, p);
210 break;
211 }
212 case 'b': {
213 /* There has to be a better way to do this,
214 * but the string we generate might have
215 * embedded nulls. */
216 static char *a, *t;
217 char *cp = getstr();
218 /* Free on entry in case shell longjumped out */
219 if (a != NULL)
220 free(a);
221 a = NULL;
222 if (t != NULL)
223 free(t);
224 t = NULL;
225 /* Count number of bytes we want to output */
226 b_length = 0;
227 conv_escape_str(cp, b_count);
228 t = malloc(b_length + 1);
229 if (t == NULL)
230 break;
231 memset(t, 'x', b_length);
232 t[b_length] = 0;
233 /* Get printf to calculate the lengths */
234 *fmt = 's';
235 APF(&a, start, t);
236 b_fmt = a;
237 /* Output leading spaces and data bytes */
238 conv_escape_str(cp, b_output);
239 /* Add any trailing spaces */
240 printf("%s", b_fmt);
241 break;
242 }
243 case 'c': {
244 char p = getchr();
245 PF(start, p);
246 break;
247 }
248 case 's': {
249 char *p = getstr();
250 PF(start, p);
251 break;
252 }
253 case 'd':
254 case 'i': {
255 intmax_t p = getintmax();
256 char *f = mklong(start, ch);
257 PF(f, p);
258 break;
259 }
260 case 'o':
261 case 'u':
262 case 'x':
263 case 'X': {
264 uintmax_t p = getuintmax();
265 char *f = mklong(start, ch);
266 PF(f, p);
267 break;
268 }
269 case 'e':
270 case 'E':
271 case 'f':
272 case 'g':
273 case 'G': {
274 double p = getdouble();
275 PF(start, p);
276 break;
277 }
278 default:
279 warnx("%s: invalid directive", start);
280 return 1;
281 }
282 *fmt++ = ch;
283 *fmt = nextch;
284 /* escape if a \c was encountered */
285 if (rval & 0x100)
286 return rval & ~0x100;
287 }
288 } while (gargv != argv && *gargv);
289
290 return rval;
291}
292
293/* helper functions for conv_escape_str */
294
295static void
296/*ARGSUSED*/
297b_count(int ch)
298{
299 b_length++;
300}
301
302/* Output one converted character for every 'x' in the 'format' */
303
304static void
305b_output(int ch)
306{
307 for (;;) {
308 switch (*b_fmt++) {
309 case 0:
310 b_fmt--;
311 return;
312 case ' ':
313 putchar(' ');
314 break;
315 default:
316 putchar(ch);
317 return;
318 }
319 }
320}
321
322
323/*
324 * Print SysV echo(1) style escape string
325 * Halts processing string if a \c escape is encountered.
326 */
327static void
328conv_escape_str(char *str, void (*do_putchar)(int))
329{
330 int value;
331 int ch;
332 char c;
333
334 while ((ch = *str++) != '\0') {
335 if (ch != '\\') {
336 do_putchar(ch);
337 continue;
338 }
339
340 ch = *str++;
341 if (ch == 'c') {
342 /* \c as in SYSV echo - abort all processing.... */
343 rval |= 0x100;
344 break;
345 }
346
347 /*
348 * %b string octal constants are not like those in C.
349 * They start with a \0, and are followed by 0, 1, 2,
350 * or 3 octal digits.
351 */
352 if (ch == '0') {
353 int octnum = 0, i;
354 for (i = 0; i < 3; i++) {
355 if (!isdigit((unsigned char)*str) || *str > '7')
356 break;
357 octnum = (octnum << 3) | (*str++ - '0');
358 }
359 do_putchar(octnum);
360 continue;
361 }
362
363 /* \[M][^|-]C as defined by vis(3) */
364 if (ch == 'M' && *str == '-') {
365 do_putchar(0200 | str[1]);
366 str += 2;
367 continue;
368 }
369 if (ch == 'M' && *str == '^') {
370 str++;
371 value = 0200;
372 ch = '^';
373 } else
374 value = 0;
375 if (ch == '^') {
376 ch = *str++;
377 if (ch == '?')
378 value |= 0177;
379 else
380 value |= ch & 037;
381 do_putchar(value);
382 continue;
383 }
384
385 /* Finally test for sequences valid in the format string */
386 str = conv_escape(str - 1, &c);
387 do_putchar(c);
388 }
389}
390
391/*
392 * Print "standard" escape characters
393 */
394static char *
395conv_escape(char *str, char *conv_ch)
396{
397 int value;
398 int ch;
399 char num_buf[4], *num_end;
400
401 ch = *str++;
402
403 switch (ch) {
404 case '0': case '1': case '2': case '3':
405 case '4': case '5': case '6': case '7':
406 num_buf[0] = ch;
407 ch = str[0];
408 num_buf[1] = ch;
409 num_buf[2] = ch ? str[1] : 0;
410 num_buf[3] = 0;
411 value = strtoul(num_buf, &num_end, 8);
412 str += num_end - (num_buf + 1);
413 break;
414
415 case 'x':
416 /* Hexadecimal character constants are not required to be
417 supported (by SuS v1) because there is no consistent
418 way to detect the end of the constant.
419 Supporting 2 byte constants is a compromise. */
420 ch = str[0];
421 num_buf[0] = ch;
422 num_buf[1] = ch ? str[1] : 0;
423 num_buf[2] = 0;
424 value = strtoul(num_buf, &num_end, 16);
425 str += num_end - num_buf;
426 break;
427
428 case '\\': value = '\\'; break; /* backslash */
429 case '\'': value = '\''; break; /* single quote */
430 case '"': value = '"'; break; /* double quote */
431 case 'a': value = '\a'; break; /* alert */
432 case 'b': value = '\b'; break; /* backspace */
433 case 'e': value = ESCAPE; break; /* escape */
434 case 'f': value = '\f'; break; /* form-feed */
435 case 'n': value = '\n'; break; /* newline */
436 case 'r': value = '\r'; break; /* carriage-return */
437 case 't': value = '\t'; break; /* tab */
438 case 'v': value = '\v'; break; /* vertical-tab */
439
440 default:
441 warnx("unknown escape sequence `\\%c'", ch);
442 rval = 1;
443 value = ch;
444 break;
445 }
446
447 *conv_ch = value;
448 return str;
449}
450
451/* expand a string so that everything is printable */
452
453static char *
454conv_expand(const char *str)
455{
456 static char *conv_str;
457 static char no_memory[] = "<no memory>";
458 char *cp;
459 int ch;
460
461 if (conv_str)
462 free(conv_str);
463 /* get a buffer that is definitely large enough.... */
464 conv_str = malloc(4 * strlen(str) + 1);
465 if (!conv_str)
466 return no_memory;
467 cp = conv_str;
468
469 while ((ch = *(const unsigned char *)str++) != '\0') {
470 switch (ch) {
471 /* Use C escapes for expected control characters */
472 case '\\': ch = '\\'; break; /* backslash */
473 case '\'': ch = '\''; break; /* single quote */
474 case '"': ch = '"'; break; /* double quote */
475 case '\a': ch = 'a'; break; /* alert */
476 case '\b': ch = 'b'; break; /* backspace */
477 case ESCAPE: ch = 'e'; break; /* escape */
478 case '\f': ch = 'f'; break; /* form-feed */
479 case '\n': ch = 'n'; break; /* newline */
480 case '\r': ch = 'r'; break; /* carriage-return */
481 case '\t': ch = 't'; break; /* tab */
482 case '\v': ch = 'v'; break; /* vertical-tab */
483 default:
484 /* Copy anything printable */
485 if (isprint(ch)) {
486 *cp++ = ch;
487 continue;
488 }
489 /* Use vis(3) encodings for the rest */
490 *cp++ = '\\';
491 if (ch & 0200) {
492 *cp++ = 'M';
493 ch &= ~0200;
494 }
495 if (ch == 0177) {
496 *cp++ = '^';
497 *cp++ = '?';
498 continue;
499 }
500 if (ch < 040) {
501 *cp++ = '^';
502 *cp++ = ch | 0100;
503 continue;
504 }
505 *cp++ = '-';
506 *cp++ = ch;
507 continue;
508 }
509 *cp++ = '\\';
510 *cp++ = ch;
511 }
512
513 *cp = 0;
514 return conv_str;
515}
516
517static char *
518mklong(const char *str, int ch)
519{
520 static char copy[64];
521 size_t len;
522
523 len = strlen(str) + 2;
524 if (len > sizeof copy) {
525 warnx("format %s too complex\n", str);
526 len = 4;
527 }
528 (void)memmove(copy, str, len - 3);
529 copy[len - 3] = 'j';
530 copy[len - 2] = ch;
531 copy[len - 1] = '\0';
532 return copy;
533}
534
535static int
536getchr(void)
537{
538 if (!*gargv)
539 return 0;
540 return (int)**gargv++;
541}
542
543static char *
544getstr(void)
545{
546 static char empty[] = "";
547 if (!*gargv)
548 return empty;
549 return *gargv++;
550}
551
552static int
553getwidth(void)
554{
555 long val;
556 char *s, *ep;
557
558 s = *gargv;
559 if (!*gargv)
560 return (0);
561 gargv++;
562
563 errno = 0;
564 val = strtoul(s, &ep, 0);
565 check_conversion(s, ep);
566
567 /* Arbitrarily 'restrict' field widths to 1Mbyte */
568 if (val < 0 || val > 1 << 20) {
569 warnx("%s: invalid field width", s);
570 return 0;
571 }
572
573 return val;
574}
575
576static intmax_t
577getintmax(void)
578{
579 intmax_t val;
580 char *cp, *ep;
581
582 cp = *gargv;
583 if (cp == NULL)
584 return 0;
585 gargv++;
586
587 if (*cp == '\"' || *cp == '\'')
588 return *(cp+1);
589
590 errno = 0;
591 val = strtoimax(cp, &ep, 0);
592 check_conversion(cp, ep);
593 return val;
594}
595
596static uintmax_t
597getuintmax(void)
598{
599 uintmax_t val;
600 char *cp, *ep;
601
602 cp = *gargv;
603 if (cp == NULL)
604 return 0;
605 gargv++;
606
607 if (*cp == '\"' || *cp == '\'')
608 return *(cp + 1);
609
610 /* strtoumax won't error -ve values */
611 while (isspace(*(unsigned char *)cp))
612 cp++;
613 if (*cp == '-') {
614 warnx("%s: expected positive numeric value", cp);
615 rval = 1;
616 return 0;
617 }
618
619 errno = 0;
620 val = strtoumax(cp, &ep, 0);
621 check_conversion(cp, ep);
622 return val;
623}
624
625static double
626getdouble(void)
627{
628 double val;
629 char *ep;
630
631 if (!*gargv)
632 return (0.0);
633
634 if (**gargv == '\"' || **gargv == '\'')
635 return (double) *((*gargv++)+1);
636
637 errno = 0;
638 val = strtod(*gargv, &ep);
639 check_conversion(*gargv++, ep);
640 return val;
641}
642
643static void
644check_conversion(const char *s, const char *ep)
645{
646 if (*ep) {
647 if (ep == s)
648 warnx("%s: expected numeric value", s);
649 else
650 warnx("%s: not completely converted", s);
651 rval = 1;
652 } else if (errno == ERANGE) {
653 warnx("%s: %s", s, strerror(ERANGE));
654 rval = 1;
655 }
656}
657
658static void
659usage(void)
660{
661 (void)fprintf(stderr, "Usage: %s format [arg ...]\n", getprogname());
662}
Note: See TracBrowser for help on using the repository browser.