1 /*-
2 * Copyright (c) 1986, 1988, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
9 * Copyright (c) 2011 Konstantin Belousov <kib@FreeBSD.org>
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * $FreeBSD$
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
46 #define MAXNBUF (sizeof(intmax_t) * NBBY + 1)
47
48 #define PRINT_METHOD_SNPRINTF 1
49 #define PRINT_METHOD_WRITE 2
50
51 struct snprintf_arg {
52 int method;
53 char *str;
54 char *buf;
55 size_t remain;
56 size_t buf_total;
57 int fd;
58 };
59
60 static void
printf_out(struct snprintf_arg * info)61 printf_out(struct snprintf_arg *info)
62 {
63
64 if (info->remain == info->buf_total)
65 return;
66 write(info->fd, info->buf, info->buf_total - info->remain);
67 info->str = info->buf;
68 info->remain = info->buf_total;
69 }
70
71 static void
snprintf_func(int ch,struct snprintf_arg * const info)72 snprintf_func(int ch, struct snprintf_arg *const info)
73 {
74
75 switch (info->method) {
76 case PRINT_METHOD_SNPRINTF:
77 if (info->remain >= 2) {
78 *info->str++ = ch;
79 info->remain--;
80 }
81 break;
82 case PRINT_METHOD_WRITE:
83 if (info->remain > 0) {
84 *info->str++ = ch;
85 info->remain--;
86 } else
87 printf_out(info);
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 case '1': case '2': case '3': case '4':
189 case '5': case '6': case '7': case '8': case '9':
190 for (n = 0;; ++fmt) {
191 n = n * 10 + ch - '0';
192 ch = *fmt;
193 if (ch < '0' || ch > '9')
194 break;
195 }
196 if (dot)
197 dwidth = n;
198 else
199 width = n;
200 goto reswitch;
201 case 'b':
202 num = (u_int)va_arg(ap, int);
203 p = va_arg(ap, char *);
204 for (q = ksprintn(nbuf, num, *p++, NULL, 0); *q;)
205 PCHAR(*q--);
206
207 if (num == 0)
208 break;
209
210 for (tmp = 0; *p;) {
211 n = *p++;
212 if (num & (1 << (n - 1))) {
213 PCHAR(tmp ? ',' : '<');
214 for (; (n = *p) > ' '; ++p)
215 PCHAR(n);
216 tmp = 1;
217 } else
218 for (; *p > ' '; ++p)
219 continue;
220 }
221 if (tmp)
222 PCHAR('>');
223 break;
224 case 'c':
225 PCHAR(va_arg(ap, int));
226 break;
227 case 'D':
228 up = va_arg(ap, u_char *);
229 p = va_arg(ap, char *);
230 if (!width)
231 width = 16;
232 while(width--) {
233 PCHAR(hex2ascii(*up >> 4));
234 PCHAR(hex2ascii(*up & 0x0f));
235 up++;
236 if (width)
237 for (q=p;*q;q++)
238 PCHAR(*q);
239 }
240 break;
241 case 'd':
242 case 'i':
243 base = 10;
244 sign = 1;
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 goto handle_sign;
295 goto handle_nosign;
296 case 's':
297 p = va_arg(ap, char *);
298 if (p == NULL)
299 p = "(null)";
300 if (!dot)
301 n = strlen (p);
302 else
303 for (n = 0; n < dwidth && p[n]; n++)
304 continue;
305
306 width -= n;
307
308 if (!ladjust && width > 0)
309 while (width--)
310 PCHAR(padc);
311 while (n--)
312 PCHAR(*p++);
313 if (ladjust && width > 0)
314 while (width--)
315 PCHAR(padc);
316 break;
317 case 't':
318 tflag = 1;
319 goto reswitch;
320 case 'u':
321 base = 10;
322 goto handle_nosign;
323 case 'X':
324 upper = 1;
325 case 'x':
326 base = 16;
327 goto handle_nosign;
328 case 'y':
329 base = 16;
330 sign = 1;
331 goto handle_sign;
332 case 'z':
333 zflag = 1;
334 goto reswitch;
335 handle_nosign:
336 sign = 0;
337 if (jflag)
338 num = va_arg(ap, uintmax_t);
339 else if (qflag)
340 num = va_arg(ap, u_quad_t);
341 else if (tflag)
342 num = va_arg(ap, ptrdiff_t);
343 else if (lflag)
344 num = va_arg(ap, u_long);
345 else if (zflag)
346 num = va_arg(ap, size_t);
347 else if (hflag)
348 num = (u_short)va_arg(ap, int);
349 else if (cflag)
350 num = (u_char)va_arg(ap, int);
351 else
352 num = va_arg(ap, u_int);
353 goto number;
354 handle_sign:
355 if (jflag)
356 num = va_arg(ap, intmax_t);
357 else if (qflag)
358 num = va_arg(ap, quad_t);
359 else if (tflag)
360 num = va_arg(ap, ptrdiff_t);
361 else if (lflag)
362 num = va_arg(ap, long);
363 else if (zflag)
364 num = va_arg(ap, ssize_t);
365 else if (hflag)
366 num = (short)va_arg(ap, int);
367 else if (cflag)
368 num = (char)va_arg(ap, int);
369 else
370 num = va_arg(ap, int);
371 number:
372 if (sign && (intmax_t)num < 0) {
373 neg = 1;
374 num = -(intmax_t)num;
375 }
376 p = ksprintn(nbuf, num, base, &n, upper);
377 tmp = 0;
378 if (sharpflag && num != 0) {
379 if (base == 8)
380 tmp++;
381 else if (base == 16)
382 tmp += 2;
383 }
384 if (neg)
385 tmp++;
386
387 if (!ladjust && padc == '0')
388 dwidth = width - tmp;
389 width -= tmp + imax(dwidth, n);
390 dwidth -= n;
391 if (!ladjust)
392 while (width-- > 0)
393 PCHAR(' ');
394 if (neg)
395 PCHAR('-');
396 if (sharpflag && num != 0) {
397 if (base == 8) {
398 PCHAR('0');
399 } else if (base == 16) {
400 PCHAR('0');
401 PCHAR('x');
402 }
403 }
404 while (dwidth-- > 0)
405 PCHAR('0');
406
407 while (*p)
408 PCHAR(*p--);
409
410 if (ladjust)
411 while (width-- > 0)
412 PCHAR(' ');
413
414 break;
415 default:
416 while (percent < fmt)
417 PCHAR(*percent++);
418 /*
419 * Since we ignore an formatting argument it is no
420 * longer safe to obey the remaining formatting
421 * arguments as the arguments will no longer match
422 * the format specs.
423 */
424 stop = 1;
425 break;
426 }
427 }
428 #undef PCHAR
429 }
430
431 int
rtld_snprintf(char * buf,size_t bufsize,const char * fmt,...)432 rtld_snprintf(char *buf, size_t bufsize, const char *fmt, ...)
433 {
434 va_list ap;
435 int retval;
436
437 va_start(ap, fmt);
438 retval = rtld_vsnprintf(buf, bufsize, fmt, ap);
439 va_end(ap);
440 return (retval);
441 }
442
443 int
rtld_vsnprintf(char * buf,size_t bufsize,const char * fmt,va_list ap)444 rtld_vsnprintf(char *buf, size_t bufsize, const char *fmt, va_list ap)
445 {
446 struct snprintf_arg info;
447 int retval;
448
449 info.method = PRINT_METHOD_SNPRINTF;
450 info.buf = info.str = buf;
451 info.buf_total = info.remain = bufsize;
452 info.fd = -1;
453 retval = kvprintf(fmt, &info, 10, ap);
454 if (info.remain >= 1)
455 *info.str++ = '\0';
456 return (retval);
457 }
458
459 int
rtld_vfdprintf(int fd,const char * fmt,va_list ap)460 rtld_vfdprintf(int fd, const char *fmt, va_list ap)
461 {
462 char buf[512];
463 struct snprintf_arg info;
464 int retval;
465
466 info.method = PRINT_METHOD_WRITE;
467 info.buf = info.str = buf;
468 info.buf_total = info.remain = sizeof(buf);
469 info.fd = fd;
470 retval = kvprintf(fmt, &info, 10, ap);
471 printf_out(&info);
472 return (retval);
473 }
474
475 int
rtld_fdprintf(int fd,const char * fmt,...)476 rtld_fdprintf(int fd, const char *fmt, ...)
477 {
478 va_list ap;
479 int retval;
480
481 va_start(ap, fmt);
482 retval = rtld_vfdprintf(fd, fmt, ap);
483 va_end(ap);
484 return (retval);
485 }
486
487 void
rtld_fdputstr(int fd,const char * str)488 rtld_fdputstr(int fd, const char *str)
489 {
490
491 write(fd, str, strlen(str));
492 }
493
494 void
rtld_fdputchar(int fd,int c)495 rtld_fdputchar(int fd, int c)
496 {
497 char c1;
498
499 c1 = c;
500 write(fd, &c1, 1);
501 }
502