1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1986, 1988, 1991, 1993
5 * The Regents of the University of California. All rights reserved.
6 * (c) UNIX System Laboratories, Inc.
7 * All or some portions of this file are derived from material licensed
8 * to the University of California by American Telephone and Telegraph
9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10 * the permission of UNIX System Laboratories, Inc.
11 * Copyright (c) 2011 Konstantin Belousov <kib@FreeBSD.org>
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 */
37
38 #include <sys/param.h>
39 #include <inttypes.h>
40 #include <stdarg.h>
41 #include <stddef.h>
42 #include <string.h>
43 #include <unistd.h>
44 #include "rtld_printf.h"
45 #include "rtld_libc.h"
46
47 #define MAXNBUF (sizeof(intmax_t) * NBBY + 1)
48
49 #define PRINT_METHOD_SNPRINTF 1
50 #define PRINT_METHOD_WRITE 2
51
52 struct snprintf_arg {
53 int method;
54 char *str;
55 char *buf;
56 size_t remain;
57 size_t buf_total;
58 int fd;
59 };
60
61 static void
printf_out(struct snprintf_arg * info)62 printf_out(struct snprintf_arg *info)
63 {
64
65 if (info->remain == info->buf_total)
66 return;
67 write(info->fd, info->buf, info->buf_total - info->remain);
68 info->str = info->buf;
69 info->remain = info->buf_total;
70 }
71
72 static void
snprintf_func(int ch,struct snprintf_arg * const info)73 snprintf_func(int ch, struct snprintf_arg *const info)
74 {
75
76 switch (info->method) {
77 case PRINT_METHOD_SNPRINTF:
78 if (info->remain >= 2) {
79 *info->str++ = ch;
80 info->remain--;
81 }
82 break;
83 case PRINT_METHOD_WRITE:
84 if (info->remain == 0)
85 printf_out(info);
86 *info->str++ = ch;
87 info->remain--;
88 break;
89 }
90 }
91
92 static char const hex2ascii_lower[] = "0123456789abcdefghijklmnopqrstuvwxyz";
93 static char const hex2ascii_upper[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
94 #define hex2ascii(hex) (hex2ascii_lower[hex])
95 #define hex2ascii_upper(hex) (hex2ascii_upper[hex])
96
97 static __inline int
imax(int a,int b)98 imax(int a, int b)
99 {
100
101 return (a > b ? a : b);
102 }
103
104 static char *
ksprintn(char * nbuf,uintmax_t num,int base,int * lenp,int upper)105 ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper)
106 {
107 char *p, c;
108
109 p = nbuf;
110 *p = '\0';
111 do {
112 c = upper ? hex2ascii_upper(num % base) :
113 hex2ascii(num % base);
114 *++p = c;
115 } while (num /= base);
116 if (lenp)
117 *lenp = p - nbuf;
118 return (p);
119 }
120
121 static int
kvprintf(char const * fmt,struct snprintf_arg * arg,int radix,va_list ap)122 kvprintf(char const *fmt, struct snprintf_arg *arg, int radix, va_list ap)
123 {
124 #define PCHAR(c) snprintf_func((c), arg)
125 char nbuf[MAXNBUF];
126 const char *p, *percent, *q;
127 u_char *up;
128 int ch, n;
129 uintmax_t num;
130 int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot;
131 int cflag, hflag, jflag, tflag, zflag;
132 int dwidth, upper;
133 char padc;
134 int stop = 0, retval = 0;
135
136 num = 0;
137
138 if (fmt == NULL)
139 fmt = "(fmt null)\n";
140
141 if (radix < 2 || radix > 36)
142 radix = 10;
143
144 for (;;) {
145 padc = ' ';
146 width = 0;
147 while ((ch = (u_char)*fmt++) != '%' || stop) {
148 if (ch == '\0')
149 return (retval);
150 PCHAR(ch);
151 }
152 percent = fmt - 1;
153 qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0;
154 sign = 0; dot = 0; dwidth = 0; upper = 0;
155 cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 0;
156 reswitch: switch (ch = (u_char)*fmt++) {
157 case '.':
158 dot = 1;
159 goto reswitch;
160 case '#':
161 sharpflag = 1;
162 goto reswitch;
163 case '+':
164 sign = 1;
165 goto reswitch;
166 case '-':
167 ladjust = 1;
168 goto reswitch;
169 case '%':
170 PCHAR(ch);
171 break;
172 case '*':
173 if (!dot) {
174 width = va_arg(ap, int);
175 if (width < 0) {
176 ladjust = !ladjust;
177 width = -width;
178 }
179 } else {
180 dwidth = va_arg(ap, int);
181 }
182 goto reswitch;
183 case '0':
184 if (!dot) {
185 padc = '0';
186 goto reswitch;
187 }
188 /* FALLTHROUGH */
189 case '1': case '2': case '3': case '4':
190 case '5': case '6': case '7': case '8': case '9':
191 for (n = 0;; ++fmt) {
192 n = n * 10 + ch - '0';
193 ch = *fmt;
194 if (ch < '0' || ch > '9')
195 break;
196 }
197 if (dot)
198 dwidth = n;
199 else
200 width = n;
201 goto reswitch;
202 case 'b':
203 num = (u_int)va_arg(ap, int);
204 p = va_arg(ap, char *);
205 for (q = ksprintn(nbuf, num, *p++, NULL, 0); *q;)
206 PCHAR(*q--);
207
208 if (num == 0)
209 break;
210
211 for (tmp = 0; *p;) {
212 n = *p++;
213 if (num & (1 << (n - 1))) {
214 PCHAR(tmp ? ',' : '<');
215 for (; (n = *p) > ' '; ++p)
216 PCHAR(n);
217 tmp = 1;
218 } else
219 for (; *p > ' '; ++p)
220 continue;
221 }
222 if (tmp)
223 PCHAR('>');
224 break;
225 case 'c':
226 PCHAR(va_arg(ap, int));
227 break;
228 case 'D':
229 up = va_arg(ap, u_char *);
230 p = va_arg(ap, char *);
231 if (!width)
232 width = 16;
233 while(width--) {
234 PCHAR(hex2ascii(*up >> 4));
235 PCHAR(hex2ascii(*up & 0x0f));
236 up++;
237 if (width)
238 for (q=p;*q;q++)
239 PCHAR(*q);
240 }
241 break;
242 case 'd':
243 case 'i':
244 base = 10;
245 sign = 1;
246 goto handle_sign;
247 case 'h':
248 if (hflag) {
249 hflag = 0;
250 cflag = 1;
251 } else
252 hflag = 1;
253 goto reswitch;
254 case 'j':
255 jflag = 1;
256 goto reswitch;
257 case 'l':
258 if (lflag) {
259 lflag = 0;
260 qflag = 1;
261 } else
262 lflag = 1;
263 goto reswitch;
264 case 'n':
265 if (jflag)
266 *(va_arg(ap, intmax_t *)) = retval;
267 else if (qflag)
268 *(va_arg(ap, quad_t *)) = retval;
269 else if (lflag)
270 *(va_arg(ap, long *)) = retval;
271 else if (zflag)
272 *(va_arg(ap, size_t *)) = retval;
273 else if (hflag)
274 *(va_arg(ap, short *)) = retval;
275 else if (cflag)
276 *(va_arg(ap, char *)) = retval;
277 else
278 *(va_arg(ap, int *)) = retval;
279 break;
280 case 'o':
281 base = 8;
282 goto handle_nosign;
283 case 'p':
284 base = 16;
285 sharpflag = (width == 0);
286 sign = 0;
287 num = (uintptr_t)va_arg(ap, void *);
288 goto number;
289 case 'q':
290 qflag = 1;
291 goto reswitch;
292 case 'r':
293 base = radix;
294 if (sign)
295 goto handle_sign;
296 goto handle_nosign;
297 case 's':
298 p = va_arg(ap, char *);
299 if (p == NULL)
300 p = "(null)";
301 if (!dot)
302 n = strlen (p);
303 else
304 for (n = 0; n < dwidth && p[n]; n++)
305 continue;
306
307 width -= n;
308
309 if (!ladjust && width > 0)
310 while (width--)
311 PCHAR(padc);
312 while (n--)
313 PCHAR(*p++);
314 if (ladjust && width > 0)
315 while (width--)
316 PCHAR(padc);
317 break;
318 case 't':
319 tflag = 1;
320 goto reswitch;
321 case 'u':
322 base = 10;
323 goto handle_nosign;
324 case 'X':
325 upper = 1;
326 /* FALLTHROUGH */
327 case 'x':
328 base = 16;
329 goto handle_nosign;
330 case 'y':
331 base = 16;
332 sign = 1;
333 goto handle_sign;
334 case 'z':
335 zflag = 1;
336 goto reswitch;
337 handle_nosign:
338 sign = 0;
339 if (jflag)
340 num = va_arg(ap, uintmax_t);
341 else if (qflag)
342 num = va_arg(ap, u_quad_t);
343 else if (tflag)
344 num = va_arg(ap, ptrdiff_t);
345 else if (lflag)
346 num = va_arg(ap, u_long);
347 else if (zflag)
348 num = va_arg(ap, size_t);
349 else if (hflag)
350 num = (u_short)va_arg(ap, int);
351 else if (cflag)
352 num = (u_char)va_arg(ap, int);
353 else
354 num = va_arg(ap, u_int);
355 goto number;
356 handle_sign:
357 if (jflag)
358 num = va_arg(ap, intmax_t);
359 else if (qflag)
360 num = va_arg(ap, quad_t);
361 else if (tflag)
362 num = va_arg(ap, ptrdiff_t);
363 else if (lflag)
364 num = va_arg(ap, long);
365 else if (zflag)
366 num = va_arg(ap, ssize_t);
367 else if (hflag)
368 num = (short)va_arg(ap, int);
369 else if (cflag)
370 num = (char)va_arg(ap, int);
371 else
372 num = va_arg(ap, int);
373 number:
374 if (sign && (intmax_t)num < 0) {
375 neg = 1;
376 num = -(intmax_t)num;
377 }
378 p = ksprintn(nbuf, num, base, &n, upper);
379 tmp = 0;
380 if (sharpflag && num != 0) {
381 if (base == 8)
382 tmp++;
383 else if (base == 16)
384 tmp += 2;
385 }
386 if (neg)
387 tmp++;
388
389 if (!ladjust && padc == '0')
390 dwidth = width - tmp;
391 width -= tmp + imax(dwidth, n);
392 dwidth -= n;
393 if (!ladjust)
394 while (width-- > 0)
395 PCHAR(' ');
396 if (neg)
397 PCHAR('-');
398 if (sharpflag && num != 0) {
399 if (base == 8) {
400 PCHAR('0');
401 } else if (base == 16) {
402 PCHAR('0');
403 PCHAR('x');
404 }
405 }
406 while (dwidth-- > 0)
407 PCHAR('0');
408
409 while (*p)
410 PCHAR(*p--);
411
412 if (ladjust)
413 while (width-- > 0)
414 PCHAR(' ');
415
416 break;
417 default:
418 while (percent < fmt)
419 PCHAR(*percent++);
420 /*
421 * Since we ignore an formatting argument it is no
422 * longer safe to obey the remaining formatting
423 * arguments as the arguments will no longer match
424 * the format specs.
425 */
426 stop = 1;
427 break;
428 }
429 }
430 #undef PCHAR
431 }
432
433 int
rtld_snprintf(char * buf,size_t bufsize,const char * fmt,...)434 rtld_snprintf(char *buf, size_t bufsize, const char *fmt, ...)
435 {
436 va_list ap;
437 int retval;
438
439 va_start(ap, fmt);
440 retval = rtld_vsnprintf(buf, bufsize, fmt, ap);
441 va_end(ap);
442 return (retval);
443 }
444
445 int
rtld_vsnprintf(char * buf,size_t bufsize,const char * fmt,va_list ap)446 rtld_vsnprintf(char *buf, size_t bufsize, const char *fmt, va_list ap)
447 {
448 struct snprintf_arg info;
449 int retval;
450
451 info.method = PRINT_METHOD_SNPRINTF;
452 info.buf = info.str = buf;
453 info.buf_total = info.remain = bufsize;
454 info.fd = -1;
455 retval = kvprintf(fmt, &info, 10, ap);
456 if (info.remain >= 1)
457 *info.str++ = '\0';
458 return (retval);
459 }
460
461 int
rtld_vfdprintf(int fd,const char * fmt,va_list ap)462 rtld_vfdprintf(int fd, const char *fmt, va_list ap)
463 {
464 char buf[512];
465 struct snprintf_arg info;
466 int retval;
467
468 info.method = PRINT_METHOD_WRITE;
469 info.buf = info.str = buf;
470 info.buf_total = info.remain = sizeof(buf);
471 info.fd = fd;
472 retval = kvprintf(fmt, &info, 10, ap);
473 printf_out(&info);
474 return (retval);
475 }
476
477 int
rtld_fdprintf(int fd,const char * fmt,...)478 rtld_fdprintf(int fd, const char *fmt, ...)
479 {
480 va_list ap;
481 int retval;
482
483 va_start(ap, fmt);
484 retval = rtld_vfdprintf(fd, fmt, ap);
485 va_end(ap);
486 return (retval);
487 }
488
489 int
rtld_fdprintfx(int fd,const char * fmt,...)490 rtld_fdprintfx(int fd, const char *fmt, ...)
491 {
492 va_list ap;
493 int retval;
494
495 va_start(ap, fmt);
496 retval = rtld_vfdprintf(fd, fmt, ap);
497 va_end(ap);
498 return (retval);
499 }
500
501 void
rtld_fdputstr(int fd,const char * str)502 rtld_fdputstr(int fd, const char *str)
503 {
504
505 write(fd, str, strlen(str));
506 }
507
508 void
rtld_fdputchar(int fd,int c)509 rtld_fdputchar(int fd, int c)
510 {
511 char c1;
512
513 c1 = c;
514 write(fd, &c1, 1);
515 }
516