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if_ovpn: fix module load in NOINET6 kernels
[freebsd/src.git] / libexec / rtld-elf / rtld_printf.c
blob69ee4e46fd1cb0224b2fdbcdc86bff54187c432f
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
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
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
98 imax(int a, int b)
99 {
100
101 return (a > b ? a : b);
102 }
103
104 static char *
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
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, sign;
129 uintmax_t num;
130 int base, lflag, qflag, tmp, width, ladjust, sharpflag, 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;
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 = '+';
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 goto handle_sign;
246 case 'h':
247 if (hflag) {
248 hflag = 0;
249 cflag = 1;
250 } else
251 hflag = 1;
252 goto reswitch;
253 case 'j':
254 jflag = 1;
255 goto reswitch;
256 case 'l':
257 if (lflag) {
258 lflag = 0;
259 qflag = 1;
260 } else
261 lflag = 1;
262 goto reswitch;
263 case 'n':
264 if (jflag)
265 *(va_arg(ap, intmax_t *)) = retval;
266 else if (qflag)
267 *(va_arg(ap, quad_t *)) = retval;
268 else if (lflag)
269 *(va_arg(ap, long *)) = retval;
270 else if (zflag)
271 *(va_arg(ap, size_t *)) = retval;
272 else if (hflag)
273 *(va_arg(ap, short *)) = retval;
274 else if (cflag)
275 *(va_arg(ap, char *)) = retval;
276 else
277 *(va_arg(ap, int *)) = retval;
278 break;
279 case 'o':
280 base = 8;
281 goto handle_nosign;
282 case 'p':
283 base = 16;
284 sharpflag = (width == 0);
285 sign = 0;
286 num = (uintptr_t)va_arg(ap, void *);
287 goto number;
288 case 'q':
289 qflag = 1;
290 goto reswitch;
291 case 'r':
292 base = radix;
293 if (sign) {
294 sign = 0;
295 goto handle_sign;
296 }
297 goto handle_nosign;
298 case 's':
299 p = va_arg(ap, char *);
300 if (p == NULL)
301 p = "(null)";
302 if (!dot)
303 n = strlen (p);
304 else
305 for (n = 0; n < dwidth && p[n]; n++)
306 continue;
307
308 width -= n;
309
310 if (!ladjust && width > 0)
311 while (width--)
312 PCHAR(padc);
313 while (n--)
314 PCHAR(*p++);
315 if (ladjust && width > 0)
316 while (width--)
317 PCHAR(padc);
318 break;
319 case 't':
320 tflag = 1;
321 goto reswitch;
322 case 'u':
323 base = 10;
324 goto handle_nosign;
325 case 'X':
326 upper = 1;
327 /* FALLTHROUGH */
328 case 'x':
329 base = 16;
330 goto handle_nosign;
331 case 'y':
332 base = 16;
333 goto handle_sign;
334 case 'z':
335 zflag = 1;
336 goto reswitch;
337 handle_nosign:
338 if (jflag)
339 num = va_arg(ap, uintmax_t);
340 else if (qflag)
341 num = va_arg(ap, u_quad_t);
342 else if (tflag)
343 num = va_arg(ap, ptrdiff_t);
344 else if (lflag)
345 num = va_arg(ap, u_long);
346 else if (zflag)
347 num = va_arg(ap, size_t);
348 else if (hflag)
349 num = (u_short)va_arg(ap, int);
350 else if (cflag)
351 num = (u_char)va_arg(ap, int);
352 else
353 num = va_arg(ap, u_int);
354 goto number;
355 handle_sign:
356 if (jflag)
357 num = va_arg(ap, intmax_t);
358 else if (qflag)
359 num = va_arg(ap, quad_t);
360 else if (tflag)
361 num = va_arg(ap, ptrdiff_t);
362 else if (lflag)
363 num = va_arg(ap, long);
364 else if (zflag)
365 num = va_arg(ap, ssize_t);
366 else if (hflag)
367 num = (short)va_arg(ap, int);
368 else if (cflag)
369 num = (signed char)va_arg(ap, int);
370 else
371 num = va_arg(ap, int);
372 if ((intmax_t)num < 0) {
373 sign = '-';
374 num = -(intmax_t)num;
375 }
376 number:
377 p = ksprintn(nbuf, num, base, &n, upper);
378 tmp = 0;
379 if (sharpflag && num != 0) {
380 if (base == 8)
381 tmp++;
382 else if (base == 16)
383 tmp += 2;
384 }
385 if (sign)
386 tmp++;
387
388 if (!ladjust && padc == '0')
389 dwidth = width - tmp;
390 width -= tmp + imax(dwidth, n);
391 dwidth -= n;
392 if (!ladjust)
393 while (width-- > 0)
394 PCHAR(' ');
395 if (sign)
396 PCHAR(sign);
397 if (sharpflag && num != 0) {
398 if (base == 8) {
399 PCHAR('0');
400 } else if (base == 16) {
401 PCHAR('0');
402 PCHAR('x');
403 }
404 }
405 while (dwidth-- > 0)
406 PCHAR('0');
407
408 while (*p)
409 PCHAR(*p--);
410
411 if (ladjust)
412 while (width-- > 0)
413 PCHAR(' ');
414
415 break;
416 default:
417 while (percent < fmt)
418 PCHAR(*percent++);
419 /*
420 * Since we ignore an formatting argument it is no
421 * longer safe to obey the remaining formatting
422 * arguments as the arguments will no longer match
423 * the format specs.
424 */
425 stop = 1;
426 break;
427 }
428 }
429 #undef PCHAR
430 }
431
432 int
433 rtld_snprintf(char *buf, size_t bufsize, const char *fmt, ...)
434 {
435 va_list ap;
436 int retval;
437
438 va_start(ap, fmt);
439 retval = rtld_vsnprintf(buf, bufsize, fmt, ap);
440 va_end(ap);
441 return (retval);
442 }
443
444 int
445 rtld_vsnprintf(char *buf, size_t bufsize, const char *fmt, va_list ap)
446 {
447 struct snprintf_arg info;
448 int retval;
449
450 info.method = PRINT_METHOD_SNPRINTF;
451 info.buf = info.str = buf;
452 info.buf_total = info.remain = bufsize;
453 info.fd = -1;
454 retval = kvprintf(fmt, &info, 10, ap);
455 if (info.remain >= 1)
456 *info.str++ = '\0';
457 return (retval);
458 }
459
460 int
461 rtld_vfdprintf(int fd, const char *fmt, va_list ap)
462 {
463 char buf[512];
464 struct snprintf_arg info;
465 int retval;
466
467 info.method = PRINT_METHOD_WRITE;
468 info.buf = info.str = buf;
469 info.buf_total = info.remain = sizeof(buf);
470 info.fd = fd;
471 retval = kvprintf(fmt, &info, 10, ap);
472 printf_out(&info);
473 return (retval);
474 }
475
476 int
477 rtld_fdprintf(int fd, const char *fmt, ...)
478 {
479 va_list ap;
480 int retval;
481
482 va_start(ap, fmt);
483 retval = rtld_vfdprintf(fd, fmt, ap);
484 va_end(ap);
485 return (retval);
486 }
487
488 int
489 rtld_fdprintfx(int fd, const char *fmt, ...)
490 {
491 va_list ap;
492 int retval;
493
494 va_start(ap, fmt);
495 retval = rtld_vfdprintf(fd, fmt, ap);
496 va_end(ap);
497 return (retval);
498 }
499
500 void
501 rtld_fdputstr(int fd, const char *str)
502 {
503
504 write(fd, str, strlen(str));
505 }
506
507 void
508 rtld_fdputchar(int fd, int c)
509 {
510 char c1;
511
512 c1 = c;
513 write(fd, &c1, 1);
514 }
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