1 /* Licensed to the Apache Software Foundation (ASF) under one or more
2 * contributor license agreements. See the NOTICE file distributed with
3 * this work for additional information regarding copyright ownership.
4 * The ASF licenses this file to You under the Apache License, Version 2.0
5 * (the "License"); you may not use this file except in compliance with
6 * the License. You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 /*
18 * This code is based on, and used with the permission of, the
19 * SIO stdio-replacement strx_* functions by Panos Tsirigotis
20 * <panos@alumni.cs.colorado.edu> for xinetd.
21 */
22
23 #include "config.h"
24 #include <stdio.h>
25 #include <ctype.h>
26 #include <sys/types.h>
27 #include <stdarg.h>
28 #include <string.h>
29 #include <stdlib.h>
30 #include <math.h>
31 #include <netinet/in.h>
32
33 #ifdef HAVE_LIMITS_H
34 #include <limits.h>
35 #endif
36
37 typedef struct {
38 char *curpos;
39 char *endpos;
40 } ap_vformatter_buff;
41
42
43 #define API_EXPORT(type) type
44 #define API_EXPORT_NONSTD(type) type
45
46 #define ap_isalnum(c) (isalnum(((unsigned char)(c))))
47 #define ap_isalpha(c) (isalpha(((unsigned char)(c))))
48 #define ap_iscntrl(c) (iscntrl(((unsigned char)(c))))
49 #define ap_isdigit(c) (isdigit(((unsigned char)(c))))
50 #define ap_isgraph(c) (isgraph(((unsigned char)(c))))
51 #define ap_islower(c) (islower(((unsigned char)(c))))
52 #define ap_isprint(c) (isprint(((unsigned char)(c))))
53 #define ap_ispunct(c) (ispunct(((unsigned char)(c))))
54 #define ap_isspace(c) (isspace(((unsigned char)(c))))
55 #define ap_isupper(c) (isupper(((unsigned char)(c))))
56 #define ap_isxdigit(c) (isxdigit(((unsigned char)(c))))
57 #define ap_tolower(c) (tolower(((unsigned char)(c))))
58 #define ap_toupper(c) (toupper(((unsigned char)(c))))
59
60
61 typedef enum {
62 NO = 0, YES = 1
63 } boolean_e;
64
65 #ifndef FALSE
66 #define FALSE 0
67 #endif
68 #ifndef TRUE
69 #define TRUE 1
70 #endif
71 #ifndef AP_LONGEST_LONG
72 #define AP_LONGEST_LONG long
73 #endif
74 #define NUL '\0'
75 #define WIDE_INT long
76 #define WIDEST_INT AP_LONGEST_LONG
77
78 typedef WIDE_INT wide_int;
79 typedef unsigned WIDE_INT u_wide_int;
80 typedef WIDEST_INT widest_int;
81 #ifdef __TANDEM
82 /* Although Tandem supports "long long" there is no unsigned variant. */
83 typedef unsigned long u_widest_int;
84 #else
85 typedef unsigned WIDEST_INT u_widest_int;
86 #endif
87 typedef int bool_int;
88
89 #define S_NULL "(null)"
90 #define S_NULL_LEN 6
91
92 #define FLOAT_DIGITS 6
93 #define EXPONENT_LENGTH 10
94
95 /*
96 * NUM_BUF_SIZE is the size of the buffer used for arithmetic conversions
97 *
98 * XXX: this is a magic number; do not decrease it
99 */
100 #define NUM_BUF_SIZE 512
101
102 /*
103 * cvt.c - IEEE floating point formatting routines for FreeBSD
104 * from GNU libc-4.6.27. Modified to be thread safe.
105 */
106
107 /*
108 * ap_ecvt converts to decimal
109 * the number of digits is specified by ndigit
110 * decpt is set to the position of the decimal point
111 * sign is set to 0 for positive, 1 for negative
112 */
113
114 #define NDIG 80
115
116 /* buf must have at least NDIG bytes */
ap_cvt(double arg,int ndigits,int * decpt,int * sign,int eflag,char * buf)117 static char *ap_cvt(double arg, int ndigits, int *decpt, int *sign, int eflag, char *buf)
118 {
119 register int r2;
120 double fi, fj;
121 register char *p, *p1;
122
123 if (ndigits >= NDIG - 1)
124 ndigits = NDIG - 2;
125 r2 = 0;
126 *sign = 0;
127 p = &buf[0];
128 if (arg < 0) {
129 *sign = 1;
130 arg = -arg;
131 }
132 arg = modf(arg, &fi);
133 p1 = &buf[NDIG];
134 /*
135 * Do integer part
136 */
137 if (fi != 0) {
138 p1 = &buf[NDIG];
139 while (p1 > &buf[0] && fi != 0) {
140 fj = modf(fi / 10, &fi);
141 *--p1 = (int) ((fj + .03) * 10) + '0';
142 r2++;
143 }
144 while (p1 < &buf[NDIG])
145 *p++ = *p1++;
146 }
147 else if (arg > 0) {
148 while ((fj = arg * 10) < 1) {
149 arg = fj;
150 r2--;
151 }
152 }
153 p1 = &buf[ndigits];
154 if (eflag == 0)
155 p1 += r2;
156 *decpt = r2;
157 if (p1 < &buf[0]) {
158 buf[0] = '\0';
159 return (buf);
160 }
161 while (p <= p1 && p < &buf[NDIG]) {
162 arg *= 10;
163 arg = modf(arg, &fj);
164 *p++ = (int) fj + '0';
165 }
166 if (p1 >= &buf[NDIG]) {
167 buf[NDIG - 1] = '\0';
168 return (buf);
169 }
170 p = p1;
171 *p1 += 5;
172 while (*p1 > '9') {
173 *p1 = '0';
174 if (p1 > buf)
175 ++ * --p1;
176 else {
177 *p1 = '1';
178 (*decpt)++;
179 if (eflag == 0) {
180 if (p > buf)
181 *p = '0';
182 p++;
183 }
184 }
185 }
186 *p = '\0';
187 return (buf);
188 }
189
ap_ecvt(double arg,int ndigits,int * decpt,int * sign,char * buf)190 static char *ap_ecvt(double arg, int ndigits, int *decpt, int *sign, char *buf)
191 {
192 return (ap_cvt(arg, ndigits, decpt, sign, 1, buf));
193 }
194
ap_fcvt(double arg,int ndigits,int * decpt,int * sign,char * buf)195 static char *ap_fcvt(double arg, int ndigits, int *decpt, int *sign, char *buf)
196 {
197 return (ap_cvt(arg, ndigits, decpt, sign, 0, buf));
198 }
199
200 /*
201 * ap_gcvt - Floating output conversion to
202 * minimal length string
203 */
204
ap_gcvt(double number,int ndigit,char * buf,boolean_e altform)205 static char *ap_gcvt(double number, int ndigit, char *buf, boolean_e altform)
206 {
207 int sign, decpt;
208 register char *p1, *p2;
209 register int i;
210 char buf1[NDIG];
211
212 p1 = ap_ecvt(number, ndigit, &decpt, &sign, buf1);
213 p2 = buf;
214 if (sign)
215 *p2++ = '-';
216 for (i = ndigit - 1; i > 0 && p1[i] == '0'; i--)
217 ndigit--;
218 if ((decpt >= 0 && decpt - ndigit > 4)
219 || (decpt < 0 && decpt < -3)) { /* use E-style */
220 decpt--;
221 *p2++ = *p1++;
222 *p2++ = '.';
223 for (i = 1; i < ndigit; i++)
224 *p2++ = *p1++;
225 *p2++ = 'e';
226 if (decpt < 0) {
227 decpt = -decpt;
228 *p2++ = '-';
229 }
230 else
231 *p2++ = '+';
232 if (decpt / 100 > 0)
233 *p2++ = decpt / 100 + '0';
234 if (decpt / 10 > 0)
235 *p2++ = (decpt % 100) / 10 + '0';
236 *p2++ = decpt % 10 + '0';
237 }
238 else {
239 if (decpt <= 0) {
240 if (*p1 != '0')
241 *p2++ = '.';
242 while (decpt < 0) {
243 decpt++;
244 *p2++ = '0';
245 }
246 }
247 for (i = 1; i <= ndigit; i++) {
248 *p2++ = *p1++;
249 if (i == decpt)
250 *p2++ = '.';
251 }
252 if (ndigit < decpt) {
253 while (ndigit++ < decpt)
254 *p2++ = '0';
255 *p2++ = '.';
256 }
257 }
258 if (p2[-1] == '.' && !altform)
259 p2--;
260 *p2 = '\0';
261 return (buf);
262 }
263
264 /*
265 * The INS_CHAR macro inserts a character in the buffer and writes
266 * the buffer back to disk if necessary
267 * It uses the char pointers sp and bep:
268 * sp points to the next available character in the buffer
269 * bep points to the end-of-buffer+1
270 * While using this macro, note that the nextb pointer is NOT updated.
271 *
272 * NOTE: Evaluation of the c argument should not have any side-effects
273 */
274 #define INS_CHAR(c, sp, bep, cc) \
275 { \
276 if (sp >= bep) { \
277 vbuff->curpos = sp; \
278 if (flush_func(vbuff)) \
279 return -1; \
280 sp = vbuff->curpos; \
281 bep = vbuff->endpos; \
282 } \
283 *sp++ = (c); \
284 cc++; \
285 }
286
287 #define NUM( c ) ( c - '0' )
288
289 #define STR_TO_DEC( str, num ) \
290 num = NUM( *str++ ) ; \
291 while ( ap_isdigit( *str ) ) \
292 { \
293 num *= 10 ; \
294 num += NUM( *str++ ) ; \
295 }
296
297 /*
298 * This macro does zero padding so that the precision
299 * requirement is satisfied. The padding is done by
300 * adding '0's to the left of the string that is going
301 * to be printed. We don't allow precision to be large
302 * enough that we continue past the start of s.
303 *
304 * NOTE: this makes use of the magic info that s is
305 * always based on num_buf with a size of NUM_BUF_SIZE.
306 */
307 #define FIX_PRECISION( adjust, precision, s, s_len ) \
308 if ( adjust ) { \
309 int p = precision < NUM_BUF_SIZE - 1 ? precision : NUM_BUF_SIZE - 1; \
310 while ( s_len < p ) \
311 { \
312 *--s = '0' ; \
313 s_len++ ; \
314 } \
315 }
316
317 /*
318 * Macro that does padding. The padding is done by printing
319 * the character ch.
320 */
321 #define PAD( width, len, ch ) do \
322 { \
323 INS_CHAR( ch, sp, bep, cc ) ; \
324 width-- ; \
325 } \
326 while ( width > len )
327
328 /*
329 * Prefix the character ch to the string str
330 * Increase length
331 * Set the has_prefix flag
332 */
333 #define PREFIX( str, length, ch ) *--str = ch ; length++ ; has_prefix = YES
334
335
336 /*
337 * Convert num to its decimal format.
338 * Return value:
339 * - a pointer to a string containing the number (no sign)
340 * - len contains the length of the string
341 * - is_negative is set to TRUE or FALSE depending on the sign
342 * of the number (always set to FALSE if is_unsigned is TRUE)
343 *
344 * The caller provides a buffer for the string: that is the buf_end argument
345 * which is a pointer to the END of the buffer + 1 (i.e. if the buffer
346 * is declared as buf[ 100 ], buf_end should be &buf[ 100 ])
347 *
348 * Note: we have 2 versions. One is used when we need to use quads
349 * (conv_10_quad), the other when we don't (conv_10). We're assuming the
350 * latter is faster.
351 */
conv_10(register wide_int num,register bool_int is_unsigned,register bool_int * is_negative,char * buf_end,register int * len)352 static char *conv_10(register wide_int num, register bool_int is_unsigned,
353 register bool_int *is_negative, char *buf_end,
354 register int *len)
355 {
356 register char *p = buf_end;
357 register u_wide_int magnitude;
358
359 if (is_unsigned) {
360 magnitude = (u_wide_int) num;
361 *is_negative = FALSE;
362 }
363 else {
364 *is_negative = (num < 0);
365
366 /*
367 * On a 2's complement machine, negating the most negative integer
368 * results in a number that cannot be represented as a signed integer.
369 * Here is what we do to obtain the number's magnitude:
370 * a. add 1 to the number
371 * b. negate it (becomes positive)
372 * c. convert it to unsigned
373 * d. add 1
374 */
375 if (*is_negative) {
376 wide_int t = num + 1;
377
378 magnitude = ((u_wide_int) -t) + 1;
379 }
380 else
381 magnitude = (u_wide_int) num;
382 }
383
384 /*
385 * We use a do-while loop so that we write at least 1 digit
386 */
387 do {
388 register u_wide_int new_magnitude = magnitude / 10;
389
390 *--p = (char) (magnitude - new_magnitude * 10 + '0');
391 magnitude = new_magnitude;
392 }
393 while (magnitude);
394
395 *len = buf_end - p;
396 return (p);
397 }
398
conv_10_quad(widest_int num,register bool_int is_unsigned,register bool_int * is_negative,char * buf_end,register int * len)399 static char *conv_10_quad(widest_int num, register bool_int is_unsigned,
400 register bool_int *is_negative, char *buf_end,
401 register int *len)
402 {
403 register char *p = buf_end;
404 u_widest_int magnitude;
405
406 /*
407 * We see if we can use the faster non-quad version by checking the
408 * number against the largest long value it can be. If <=, we
409 * punt to the quicker version.
410 */
411 if ((num <= ULONG_MAX && is_unsigned) || (num <= LONG_MAX && !is_unsigned))
412 return(conv_10( (wide_int)num, is_unsigned, is_negative,
413 buf_end, len));
414
415 if (is_unsigned) {
416 magnitude = (u_widest_int) num;
417 *is_negative = FALSE;
418 }
419 else {
420 *is_negative = (num < 0);
421
422 /*
423 * On a 2's complement machine, negating the most negative integer
424 * results in a number that cannot be represented as a signed integer.
425 * Here is what we do to obtain the number's magnitude:
426 * a. add 1 to the number
427 * b. negate it (becomes positive)
428 * c. convert it to unsigned
429 * d. add 1
430 */
431 if (*is_negative) {
432 widest_int t = num + 1;
433
434 magnitude = ((u_widest_int) -t) + 1;
435 }
436 else
437 magnitude = (u_widest_int) num;
438 }
439
440 /*
441 * We use a do-while loop so that we write at least 1 digit
442 */
443 do {
444 u_widest_int new_magnitude = magnitude / 10;
445
446 *--p = (char) (magnitude - new_magnitude * 10 + '0');
447 magnitude = new_magnitude;
448 }
449 while (magnitude);
450
451 *len = buf_end - p;
452 return (p);
453 }
454
455
456
conv_in_addr(struct in_addr * ia,char * buf_end,int * len)457 static char *conv_in_addr(struct in_addr *ia, char *buf_end, int *len)
458 {
459 unsigned addr = ntohl(ia->s_addr);
460 char *p = buf_end;
461 bool_int is_negative;
462 int sub_len;
463
464 p = conv_10((addr & 0x000000FF) , TRUE, &is_negative, p, &sub_len);
465 *--p = '.';
466 p = conv_10((addr & 0x0000FF00) >> 8, TRUE, &is_negative, p, &sub_len);
467 *--p = '.';
468 p = conv_10((addr & 0x00FF0000) >> 16, TRUE, &is_negative, p, &sub_len);
469 *--p = '.';
470 p = conv_10((addr & 0xFF000000) >> 24, TRUE, &is_negative, p, &sub_len);
471
472 *len = buf_end - p;
473 return (p);
474 }
475
476
477
conv_sockaddr_in(struct sockaddr_in * si,char * buf_end,int * len)478 static char *conv_sockaddr_in(struct sockaddr_in *si, char *buf_end, int *len)
479 {
480 char *p = buf_end;
481 bool_int is_negative;
482 int sub_len;
483
484 p = conv_10(ntohs(si->sin_port), TRUE, &is_negative, p, &sub_len);
485 *--p = ':';
486 p = conv_in_addr(&si->sin_addr, p, &sub_len);
487
488 *len = buf_end - p;
489 return (p);
490 }
491
492
493
494 /*
495 * Convert a floating point number to a string formats 'f', 'e' or 'E'.
496 * The result is placed in buf, and len denotes the length of the string
497 * The sign is returned in the is_negative argument (and is not placed
498 * in buf).
499 */
conv_fp(register char format,register double num,boolean_e add_dp,int precision,bool_int * is_negative,char * buf,int * len)500 static char *conv_fp(register char format, register double num,
501 boolean_e add_dp, int precision, bool_int *is_negative,
502 char *buf, int *len)
503 {
504 register char *s = buf;
505 register char *p;
506 int decimal_point;
507 char buf1[NDIG];
508
509 if (format == 'f')
510 p = ap_fcvt(num, precision, &decimal_point, is_negative, buf1);
511 else /* either e or E format */
512 p = ap_ecvt(num, precision + 1, &decimal_point, is_negative, buf1);
513
514 /*
515 * Check for Infinity and NaN
516 */
517 if (ap_isalpha(*p)) {
518 *len = strlen(strcpy(buf, p));
519 *is_negative = FALSE;
520 return (buf);
521 }
522
523 if (format == 'f') {
524 if (decimal_point <= 0) {
525 *s++ = '0';
526 if (precision > 0) {
527 *s++ = '.';
528 while (decimal_point++ < 0)
529 *s++ = '0';
530 }
531 else if (add_dp)
532 *s++ = '.';
533 }
534 else {
535 while (decimal_point-- > 0)
536 *s++ = *p++;
537 if (precision > 0 || add_dp)
538 *s++ = '.';
539 }
540 }
541 else {
542 *s++ = *p++;
543 if (precision > 0 || add_dp)
544 *s++ = '.';
545 }
546
547 /*
548 * copy the rest of p, the NUL is NOT copied
549 */
550 while (*p)
551 *s++ = *p++;
552
553 if (format != 'f') {
554 char temp[EXPONENT_LENGTH]; /* for exponent conversion */
555 int t_len;
556 bool_int exponent_is_negative;
557
558 *s++ = format; /* either e or E */
559 decimal_point--;
560 if (decimal_point != 0) {
561 p = conv_10((wide_int) decimal_point, FALSE, &exponent_is_negative,
562 &temp[EXPONENT_LENGTH], &t_len);
563 *s++ = exponent_is_negative ? '-' : '+';
564
565 /*
566 * Make sure the exponent has at least 2 digits
567 */
568 if (t_len == 1)
569 *s++ = '0';
570 while (t_len--)
571 *s++ = *p++;
572 }
573 else {
574 *s++ = '+';
575 *s++ = '0';
576 *s++ = '0';
577 }
578 }
579
580 *len = s - buf;
581 return (buf);
582 }
583
584
585 /*
586 * Convert num to a base X number where X is a power of 2. nbits determines X.
587 * For example, if nbits is 3, we do base 8 conversion
588 * Return value:
589 * a pointer to a string containing the number
590 *
591 * The caller provides a buffer for the string: that is the buf_end argument
592 * which is a pointer to the END of the buffer + 1 (i.e. if the buffer
593 * is declared as buf[ 100 ], buf_end should be &buf[ 100 ])
594 *
595 * As with conv_10, we have a faster version which is used when
596 * the number isn't quad size.
597 */
conv_p2(register u_wide_int num,register int nbits,char format,char * buf_end,register int * len)598 static char *conv_p2(register u_wide_int num, register int nbits,
599 char format, char *buf_end, register int *len)
600 {
601 register int mask = (1 << nbits) - 1;
602 register char *p = buf_end;
603 static const char low_digits[] = "0123456789abcdef";
604 static const char upper_digits[] = "0123456789ABCDEF";
605 register const char *digits = (format == 'X') ? upper_digits : low_digits;
606
607 do {
608 *--p = digits[num & mask];
609 num >>= nbits;
610 }
611 while (num);
612
613 *len = buf_end - p;
614 return (p);
615 }
616
conv_p2_quad(u_widest_int num,register int nbits,char format,char * buf_end,register int * len)617 static char *conv_p2_quad(u_widest_int num, register int nbits,
618 char format, char *buf_end, register int *len)
619 {
620 register int mask = (1 << nbits) - 1;
621 register char *p = buf_end;
622 static const char low_digits[] = "0123456789abcdef";
623 static const char upper_digits[] = "0123456789ABCDEF";
624 register const char *digits = (format == 'X') ? upper_digits : low_digits;
625
626 if (num <= ULONG_MAX)
627 return(conv_p2( (u_wide_int)num, nbits, format, buf_end, len));
628
629 do {
630 *--p = digits[num & mask];
631 num >>= nbits;
632 }
633 while (num);
634
635 *len = buf_end - p;
636 return (p);
637 }
638
639
640 /*
641 * Do format conversion placing the output in buffer
642 */
ap_vformatter(int (* flush_func)(ap_vformatter_buff *),ap_vformatter_buff * vbuff,const char * fmt,va_list ap)643 API_EXPORT(int) ap_vformatter(int (*flush_func)(ap_vformatter_buff *),
644 ap_vformatter_buff *vbuff, const char *fmt, va_list ap)
645 {
646 register char *sp;
647 register char *bep;
648 register int cc = 0;
649 register int i;
650
651 register char *s = NULL;
652 char *q;
653 int s_len;
654
655 register int min_width = 0;
656 int precision = 0;
657 enum {
658 LEFT, RIGHT
659 } adjust;
660 char pad_char;
661 char prefix_char;
662
663 double fp_num;
664 widest_int i_quad = (widest_int) 0;
665 u_widest_int ui_quad;
666 wide_int i_num = (wide_int) 0;
667 u_wide_int ui_num;
668
669 char num_buf[NUM_BUF_SIZE];
670 char char_buf[2]; /* for printing %% and %<unknown> */
671
672 enum var_type_enum {
673 IS_QUAD, IS_LONG, IS_SHORT, IS_INT
674 };
675 enum var_type_enum var_type = IS_INT;
676
677 /*
678 * Flag variables
679 */
680 boolean_e alternate_form;
681 boolean_e print_sign;
682 boolean_e print_blank;
683 boolean_e adjust_precision;
684 boolean_e adjust_width;
685 bool_int is_negative;
686
687 sp = vbuff->curpos;
688 bep = vbuff->endpos;
689
690 while (*fmt) {
691 if (*fmt != '%') {
692 INS_CHAR(*fmt, sp, bep, cc);
693 }
694 else {
695 /*
696 * Default variable settings
697 */
698 adjust = RIGHT;
699 alternate_form = print_sign = print_blank = NO;
700 pad_char = ' ';
701 prefix_char = NUL;
702
703 fmt++;
704
705 /*
706 * Try to avoid checking for flags, width or precision
707 */
708 if (!ap_islower(*fmt)) {
709 /*
710 * Recognize flags: -, #, BLANK, +
711 */
712 for (;; fmt++) {
713 if (*fmt == '-')
714 adjust = LEFT;
715 else if (*fmt == '+')
716 print_sign = YES;
717 else if (*fmt == '#')
718 alternate_form = YES;
719 else if (*fmt == ' ')
720 print_blank = YES;
721 else if (*fmt == '0')
722 pad_char = '0';
723 else
724 break;
725 }
726
727 /*
728 * Check if a width was specified
729 */
730 if (ap_isdigit(*fmt)) {
731 STR_TO_DEC(fmt, min_width);
732 adjust_width = YES;
733 }
734 else if (*fmt == '*') {
735 min_width = va_arg(ap, int);
736 fmt++;
737 adjust_width = YES;
738 if (min_width < 0) {
739 adjust = LEFT;
740 min_width = -min_width;
741 }
742 }
743 else
744 adjust_width = NO;
745
746 /*
747 * Check if a precision was specified
748 */
749 if (*fmt == '.') {
750 adjust_precision = YES;
751 fmt++;
752 if (ap_isdigit(*fmt)) {
753 STR_TO_DEC(fmt, precision);
754 }
755 else if (*fmt == '*') {
756 precision = va_arg(ap, int);
757 fmt++;
758 if (precision < 0)
759 precision = 0;
760 }
761 else
762 precision = 0;
763 }
764 else
765 adjust_precision = NO;
766 }
767 else
768 adjust_precision = adjust_width = NO;
769
770 /*
771 * Modifier check
772 */
773 if (*fmt == 'q') {
774 var_type = IS_QUAD;
775 fmt++;
776 }
777 else if (*fmt == 'l') {
778 var_type = IS_LONG;
779 fmt++;
780 }
781 else if (*fmt == 'h') {
782 var_type = IS_SHORT;
783 fmt++;
784 }
785 else {
786 var_type = IS_INT;
787 }
788
789 /*
790 * Argument extraction and printing.
791 * First we determine the argument type.
792 * Then, we convert the argument to a string.
793 * On exit from the switch, s points to the string that
794 * must be printed, s_len has the length of the string
795 * The precision requirements, if any, are reflected in s_len.
796 *
797 * NOTE: pad_char may be set to '0' because of the 0 flag.
798 * It is reset to ' ' by non-numeric formats
799 */
800 switch (*fmt) {
801 case 'u':
802 if (var_type == IS_QUAD) {
803 i_quad = va_arg(ap, u_widest_int);
804 s = conv_10_quad(i_quad, 1, &is_negative,
805 &num_buf[NUM_BUF_SIZE], &s_len);
806 }
807 else {
808 if (var_type == IS_LONG)
809 i_num = (wide_int) va_arg(ap, u_wide_int);
810 else if (var_type == IS_SHORT)
811 i_num = (wide_int) (unsigned short) va_arg(ap, unsigned int);
812 else
813 i_num = (wide_int) va_arg(ap, unsigned int);
814 s = conv_10(i_num, 1, &is_negative,
815 &num_buf[NUM_BUF_SIZE], &s_len);
816 }
817 FIX_PRECISION(adjust_precision, precision, s, s_len);
818 break;
819
820 case 'd':
821 case 'i':
822 if (var_type == IS_QUAD) {
823 i_quad = va_arg(ap, widest_int);
824 s = conv_10_quad(i_quad, 0, &is_negative,
825 &num_buf[NUM_BUF_SIZE], &s_len);
826 }
827 else {
828 if (var_type == IS_LONG)
829 i_num = (wide_int) va_arg(ap, wide_int);
830 else if (var_type == IS_SHORT)
831 i_num = (wide_int) (short) va_arg(ap, int);
832 else
833 i_num = (wide_int) va_arg(ap, int);
834 s = conv_10(i_num, 0, &is_negative,
835 &num_buf[NUM_BUF_SIZE], &s_len);
836 }
837 FIX_PRECISION(adjust_precision, precision, s, s_len);
838
839 if (is_negative)
840 prefix_char = '-';
841 else if (print_sign)
842 prefix_char = '+';
843 else if (print_blank)
844 prefix_char = ' ';
845 break;
846
847
848 case 'o':
849 if (var_type == IS_QUAD) {
850 ui_quad = va_arg(ap, u_widest_int);
851 s = conv_p2_quad(ui_quad, 3, *fmt,
852 &num_buf[NUM_BUF_SIZE], &s_len);
853 }
854 else {
855 if (var_type == IS_LONG)
856 ui_num = (u_wide_int) va_arg(ap, u_wide_int);
857 else if (var_type == IS_SHORT)
858 ui_num = (u_wide_int) (unsigned short) va_arg(ap, unsigned int);
859 else
860 ui_num = (u_wide_int) va_arg(ap, unsigned int);
861 s = conv_p2(ui_num, 3, *fmt,
862 &num_buf[NUM_BUF_SIZE], &s_len);
863 }
864 FIX_PRECISION(adjust_precision, precision, s, s_len);
865 if (alternate_form && *s != '0') {
866 *--s = '0';
867 s_len++;
868 }
869 break;
870
871
872 case 'x':
873 case 'X':
874 if (var_type == IS_QUAD) {
875 ui_quad = va_arg(ap, u_widest_int);
876 s = conv_p2_quad(ui_quad, 4, *fmt,
877 &num_buf[NUM_BUF_SIZE], &s_len);
878 }
879 else {
880 if (var_type == IS_LONG)
881 ui_num = (u_wide_int) va_arg(ap, u_wide_int);
882 else if (var_type == IS_SHORT)
883 ui_num = (u_wide_int) (unsigned short) va_arg(ap, unsigned int);
884 else
885 ui_num = (u_wide_int) va_arg(ap, unsigned int);
886 s = conv_p2(ui_num, 4, *fmt,
887 &num_buf[NUM_BUF_SIZE], &s_len);
888 }
889 FIX_PRECISION(adjust_precision, precision, s, s_len);
890 if (alternate_form && i_num != 0) {
891 *--s = *fmt; /* 'x' or 'X' */
892 *--s = '0';
893 s_len += 2;
894 }
895 break;
896
897
898 case 's':
899 s = va_arg(ap, char *);
900 if (s != NULL) {
901 s_len = strlen(s);
902 if (adjust_precision && precision < s_len)
903 s_len = precision;
904 }
905 else {
906 s = S_NULL;
907 s_len = S_NULL_LEN;
908 }
909 pad_char = ' ';
910 break;
911
912
913 case 'f':
914 case 'e':
915 case 'E':
916 fp_num = va_arg(ap, double);
917 /*
918 * * We use &num_buf[ 1 ], so that we have room for the sign
919 */
920 #ifdef HAVE_ISNAN
921 if (isnan(fp_num)) {
922 s = "nan";
923 s_len = 3;
924 }
925 else
926 #endif
927 #ifdef HAVE_ISINF
928 if (isinf(fp_num)) {
929 s = "inf";
930 s_len = 3;
931 }
932 else
933 #endif
934 {
935 s = conv_fp(*fmt, fp_num, alternate_form,
936 (adjust_precision == NO) ? FLOAT_DIGITS : precision,
937 &is_negative, &num_buf[1], &s_len);
938 if (is_negative)
939 prefix_char = '-';
940 else if (print_sign)
941 prefix_char = '+';
942 else if (print_blank)
943 prefix_char = ' ';
944 }
945 break;
946
947
948 case 'g':
949 case 'G':
950 if (adjust_precision == NO)
951 precision = FLOAT_DIGITS;
952 else if (precision == 0)
953 precision = 1;
954 /*
955 * * We use &num_buf[ 1 ], so that we have room for the sign
956 */
957 s = ap_gcvt(va_arg(ap, double), precision, &num_buf[1],
958 alternate_form);
959 if (*s == '-')
960 prefix_char = *s++;
961 else if (print_sign)
962 prefix_char = '+';
963 else if (print_blank)
964 prefix_char = ' ';
965
966 s_len = strlen(s);
967
968 if (alternate_form && (q = strchr(s, '.')) == NULL) {
969 s[s_len++] = '.';
970 s[s_len] = '\0'; /* delimit for following strchr() */
971 }
972 if (*fmt == 'G' && (q = strchr(s, 'e')) != NULL)
973 *q = 'E';
974 break;
975
976
977 case 'c':
978 char_buf[0] = (char) (va_arg(ap, int));
979 s = &char_buf[0];
980 s_len = 1;
981 pad_char = ' ';
982 break;
983
984
985 case '%':
986 char_buf[0] = '%';
987 s = &char_buf[0];
988 s_len = 1;
989 pad_char = ' ';
990 break;
991
992
993 case 'n':
994 if (var_type == IS_QUAD)
995 *(va_arg(ap, widest_int *)) = cc;
996 else if (var_type == IS_LONG)
997 *(va_arg(ap, long *)) = cc;
998 else if (var_type == IS_SHORT)
999 *(va_arg(ap, short *)) = cc;
1000 else
1001 *(va_arg(ap, int *)) = cc;
1002 break;
1003
1004 /*
1005 * This is where we extend the printf format, with a second
1006 * type specifier
1007 */
1008 case 'p':
1009 switch(*++fmt) {
1010 /*
1011 * If the pointer size is equal to or smaller than the size
1012 * of the largest unsigned int, we convert the pointer to a
1013 * hex number, otherwise we print "%p" to indicate that we
1014 * don't handle "%p".
1015 */
1016 case 'p':
1017 #ifdef AP_VOID_P_IS_QUAD
1018 if (sizeof(void *) <= sizeof(u_widest_int)) {
1019 ui_quad = (u_widest_int) va_arg(ap, void *);
1020 s = conv_p2_quad(ui_quad, 4, 'x',
1021 &num_buf[NUM_BUF_SIZE], &s_len);
1022 }
1023 #else
1024 if (sizeof(void *) <= sizeof(u_wide_int)) {
1025 ui_num = (u_wide_int) va_arg(ap, void *);
1026 s = conv_p2(ui_num, 4, 'x',
1027 &num_buf[NUM_BUF_SIZE], &s_len);
1028 }
1029 #endif
1030 else {
1031 s = "%p";
1032 s_len = 2;
1033 prefix_char = NUL;
1034 }
1035 pad_char = ' ';
1036 break;
1037
1038 /* print a struct sockaddr_in as a.b.c.d:port */
1039 case 'I':
1040 {
1041 struct sockaddr_in *si;
1042
1043 si = va_arg(ap, struct sockaddr_in *);
1044 if (si != NULL) {
1045 s = conv_sockaddr_in(si, &num_buf[NUM_BUF_SIZE], &s_len);
1046 if (adjust_precision && precision < s_len)
1047 s_len = precision;
1048 }
1049 else {
1050 s = S_NULL;
1051 s_len = S_NULL_LEN;
1052 }
1053 pad_char = ' ';
1054 }
1055 break;
1056
1057 /* print a struct in_addr as a.b.c.d */
1058 case 'A':
1059 {
1060 struct in_addr *ia;
1061
1062 ia = va_arg(ap, struct in_addr *);
1063 if (ia != NULL) {
1064 s = conv_in_addr(ia, &num_buf[NUM_BUF_SIZE], &s_len);
1065 if (adjust_precision && precision < s_len)
1066 s_len = precision;
1067 }
1068 else {
1069 s = S_NULL;
1070 s_len = S_NULL_LEN;
1071 }
1072 pad_char = ' ';
1073 }
1074 break;
1075
1076 case NUL:
1077 /* if %p ends the string, oh well ignore it */
1078 continue;
1079
1080 default:
1081 s = "bogus %p";
1082 s_len = 8;
1083 prefix_char = NUL;
1084 break;
1085 }
1086 break;
1087
1088 case NUL:
1089 /*
1090 * The last character of the format string was %.
1091 * We ignore it.
1092 */
1093 continue;
1094
1095
1096 /*
1097 * The default case is for unrecognized %'s.
1098 * We print %<char> to help the user identify what
1099 * option is not understood.
1100 * This is also useful in case the user wants to pass
1101 * the output of format_converter to another function
1102 * that understands some other %<char> (like syslog).
1103 * Note that we can't point s inside fmt because the
1104 * unknown <char> could be preceded by width etc.
1105 */
1106 default:
1107 char_buf[0] = '%';
1108 char_buf[1] = *fmt;
1109 s = char_buf;
1110 s_len = 2;
1111 pad_char = ' ';
1112 break;
1113 }
1114
1115 if (prefix_char != NUL && s != S_NULL && s != char_buf) {
1116 *--s = prefix_char;
1117 s_len++;
1118 }
1119
1120 if (adjust_width && adjust == RIGHT && min_width > s_len) {
1121 if (pad_char == '0' && prefix_char != NUL) {
1122 INS_CHAR(*s, sp, bep, cc);
1123 s++;
1124 s_len--;
1125 min_width--;
1126 }
1127 PAD(min_width, s_len, pad_char);
1128 }
1129
1130 /*
1131 * Print the string s.
1132 */
1133 for (i = s_len; i != 0; i--) {
1134 INS_CHAR(*s, sp, bep, cc);
1135 s++;
1136 }
1137
1138 if (adjust_width && adjust == LEFT && min_width > s_len)
1139 PAD(min_width, s_len, pad_char);
1140 }
1141 fmt++;
1142 }
1143 vbuff->curpos = sp;
1144
1145 return cc;
1146 }
1147
1148
snprintf_flush(ap_vformatter_buff * vbuff)1149 static int snprintf_flush(ap_vformatter_buff *vbuff)
1150 {
1151 /* if the buffer fills we have to abort immediately, there is no way
1152 * to "flush" an ap_snprintf... there's nowhere to flush it to.
1153 */
1154 return -1;
1155 }
1156
1157
ap_snprintf(char * buf,size_t len,const char * format,...)1158 API_EXPORT_NONSTD(int) ap_snprintf(char *buf, size_t len, const char *format,...)
1159 {
1160 int cc;
1161 va_list ap;
1162 ap_vformatter_buff vbuff;
1163
1164 if (len == 0)
1165 return 0;
1166
1167 /* save one byte for nul terminator */
1168 vbuff.curpos = buf;
1169 vbuff.endpos = buf + len - 1;
1170 va_start(ap, format);
1171 cc = ap_vformatter(snprintf_flush, &vbuff, format, ap);
1172 va_end(ap);
1173 *vbuff.curpos = '\0';
1174 return (cc == -1) ? len : cc;
1175 }
1176
1177
ap_vsnprintf(char * buf,size_t len,const char * format,va_list ap)1178 API_EXPORT(int) ap_vsnprintf(char *buf, size_t len, const char *format,
1179 va_list ap)
1180 {
1181 int cc;
1182 ap_vformatter_buff vbuff;
1183
1184 if (len == 0)
1185 return 0;
1186
1187 /* save one byte for nul terminator */
1188 vbuff.curpos = buf;
1189 vbuff.endpos = buf + len - 1;
1190 cc = ap_vformatter(snprintf_flush, &vbuff, format, ap);
1191 *vbuff.curpos = '\0';
1192 return (cc == -1) ? len : cc;
1193 }
1194